• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Magnetic diagnostics for magnetohydrodynamic instability research and the detection of locked modes in J-TEXT

    2021-05-22 07:01:08DongliangHAN韓東良ChengshuoSHEN沈呈碩NengchaoWANG王能超DaLI李達FeiyueMAO毛飛越ZhengkangREN任正康YonghuaDING丁永華andtheTEXTTeam
    Plasma Science and Technology 2021年5期
    關(guān)鍵詞:李達永華

    Dongliang HAN (韓東良), Chengshuo SHEN (沈呈碩),Nengchao WANG (王能超), Da LI (李達), Feiyue MAO (毛飛越),Zhengkang REN (任正康), Yonghua DING (丁永華) and the J-TEXT Team

    International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China

    Abstract Magnetohydrodynamic (MHD) instabilities are widely observed during tokamak plasma operation.Magnetic diagnostics provide important information which supports the understanding and control of MHD instabilities.This paper presents the current status of the magnetic diagnostics dedicated to measuring MHD instabilities at the J-TEXT tokamak; the diagnostics consist of five Mirnov probe arrays for measuring high-frequency magnetic perturbations and two saddle-loop arrays for low-frequency magnetic perturbations, such as the locked mode.In recent years, several changes have been made to these arrays.The structure of the probes in the poloidal Mirnov arrays has been optimized to improve their mechanical strength, and the number of in-vessel saddle loops has also been improved to support better spatial resolution.Due to the installation of high-field-side(HFS)divertor targets in early 2019,some of the probes were removed,but an HFS Mirnov array was designed and installed behind the targets.Owing to its excellent toroidal symmetry,the HFS Mirnov array has,for the first time at J-TEXT,provided valuable new information about the locked mode and the quasi-static mode(QSM) in the HFS.Besides, various groups of magnetic diagnostics at different poloidal locations have been systematically used to measure the QSM, which confirmed the poloidal mode number m and the helical structure of the QSM.By including the HFS information,the 2/1 resonant magnetic perturbation(RMP)-induced locked mode was measured to have a poloidal mode number m of ~2.

    Keywords: J-TEXT tokamak, locked mode, magnetic diagnostics, magnetohydrodynamic instabilities

    1.Introduction

    Magnetohydrodynamic (MHD) instabilities are widely observed during tokamak plasma operation.Tearing mode(TM)[1–3]is a kind of MHD instability present in most tokamak devices,which is one of the most harmful instabilities, and can even lead to disruption.The spatial distribution of the radial magnetic field induced by TM can be represented as

    Figure 1.Overview of the MHD magnetic diagnostics at J-TEXT in 2020.The green, red, blue, and cyan rectangles represent poloidal Mirnov array 1, poloidal Mirnov array 2, the toroidal Mirnov array and the HFS Mirnov array, respectively; the magenta ellipses represent ex-vessel saddle loops.

    wheremandndenote the poloidal and toroidal mode numbers,respectively, andωrepresents the angular frequency of the TM rotation.The magnetic topology generally has a helical structure,which is usually called a magnetic island.The low-mtearing modes,such as them/n=3/2 and 2/1 modes,often lead to the degradation of plasma confinement.The 2/1 mode can even stop rotation due to the locking effect of the vacuum vessel and the error field, which is called the locked mode (LM), and cause major disruptions[4–6].Therefore,measuring the mode number,frequency, amplitude, and spatial distribution of the TM is a crucial topic in MHD research.Mirnov probes and saddle loops for magnetic field measurement are fundamental diagnostics for studying magnetic confinement plasmas [7].These sensors provide simple, robust measurement of the static and fluctuating magnetic properties and span the full range of operational space.Faraday’s law of electromagnetic induction, which is the foundation of magnetic measurements, is described by

    All tokamak operators around the world attach great importance to the construction of magnetic perturbation diagnostics and have upgraded their systems according to their own experimental requirements [8].At ASDEX-U,where the mode number ranges fromn= 1 ton= 10, the toroidal array has been upgraded to give accurate mode numbers and the phases of magnetic perturbations [9]; at DIII-D, about 250 magnetic probes have been installed,providing the ability to measure non-rotational and asymmetric magnetic fields [10].

    At the J-TEXT tokamak, Mirnov probes were installed following its reconstruction in 2004 [11], while the saddle loops for locked-mode detection were installed in 2011 [12].In more recent years, an upgrade [13] was carried out in around 2017 to add a new poloidal Mirnov array and increase the spatial resolution of the toroidal Mirnov array.In addition,an ex-vessel saddle-loop array was built for locked-mode detection [14].Subsequently, several changes to these arrays emerged; in particular, a new HFS Mirnov array was installed.However, these modifications have not been described and summarized yet.In this work, we present the overall status of the J-TEXT magnetic diagnostics dedicated to the measurement of MHD instabilities in section 2, in particular,focusing on poloidal Mirnov array 2 and the in-vessel saddle loops.The newly developed HFS Mirnov array is described in detail in section 3.The QSMs and LMs are measured by these arrays, especially by the HFS Mirnov arrays.These arrays.located at various toroidal and poloidal locations,provide 3D information about QSMs and LMs, as shown in section 4.Finally, a brief summary is given in section 5.

    2.Magnetic diagnostics for MHD instability research at J-TEXT

    J-TEXT is a medium-sized limiter tokamak with a major radius (R0) of 1.05 m and a minor radius (a) of 0.25–0.3 m[11].Figure 1 displays an overview of the MHD magnetic diagnostics at J-TEXT in 2020,which consist of five Mirnov probe arrays for measuring high-frequency magnetic perturbations [13] and two saddle-loop arrays [14] for low-frequency magnetic perturbations,such as the locked mode.The Mirnov probe arrays include: (1) two poloidal Mirnov probe arrays for measuring the poloidal distribution of magnetic perturbations at two toroidal locations; (2) two toroidal Mirnov probe arrays [13] for measuring the toroidal distributionof magnetic perturbations at two poloidal locations; (3) an HFS Mirnov probe array for measuring the magnetic perturbation from the HFS.The poloidal and toroidal Mirnov arrays consist of Mirnov probe modules, which measure the time differentials of both radial and poloidal magnetic fields, dBr/dtand dθB/dt,while the HFS array consists of individual probes measuring either dBR/dtor dBZ/dt, which will be described in section 3.The saddle-loop arrays consist of 4 saddle loops mounted outside the vacuum vessel (ex-vessel saddle loops) [14] and 24 saddle loops wrapped around the RMP coils inside the vacuum vessel (in-vessel saddle loops).

    Table 1.Summary of the J-TEXT MHD magnetic diagnostic sensors.

    A new circuit board manufacturing process [15], i.e.the low-temperature co-fired ceramic (LTCC) process, was selected for the Mirnov magnetic probes.The application of LTCC technology to the fabrication of magnetic probes for tokamak vacuum vessels has the following obvious advantages.

    (1) Its material, DuPont 951, can withstand high temperatures of up to 850°C and does not release impurities in the high vacuum environment of 10?5–10?6Pa in the J-TEXT vacuum vessel.

    (2) The coil circuit is not affected by the skin effect,since it is a printed circuit with a thickness of only tens of microns, so its response to high-frequency signals is good.

    (3) The single chip of the LTCC probe is light and thin,and the coil is compact, meeting the requirement for a sufficientNSvalue while requiring a smaller volume.

    Since 2017, several changes to these arrays have emerged.The structure of the probes in the poloidal Mirnov array has been optimized to improve the mechanical strength,and the number of the in-vessel saddle loops has also been improved for higher spatial resolution.Table 1 summarizes the current status (as of 2020) of the MHD magnetic diagnostics at J-TEXT.

    2.1.Poloidal and toroidal Mirnov probe arrays

    The earliest Mirnov probe arrays at J-TEXT consisted of a poloidal Mirnov array (PMA1) with 24 2D Mirnov probes(poloidal and uniformly distributed) and a toroidal Mirnov array with 8 2D Mirnov probes (toroidal and uniformly distributed)[11].From 2016,another poloidal Mirnov array with 48 poloidal uniformly distributed 2D modules was installed at a toroidal angle of φ=56.25°,i.e.the poloidal Mirnov array 2 (PMA2), while the 8-probe toroidal array was replaced by two toroidal Mirnov arrays (TMA1 and 2).As described in[13],the initial PMA2 and toroidal Mirnov arrays consisted of LTCC probes withNSvalues of 846.5 cm2and 644.5 cm2for theBrprobes andBθprobes (figures 2(a) and (b)), respectively.By the end of 2017, the PMA2 had been optimized with a new probe size and geometric positions to improve the mechanical strength of the probes, while the toroidal Mirnov arrays remained unchanged.The new optimized probes(figure 2(c)) have 19 layers with a thickness of 1.7 mm, a length of 60 mm and a width of 17 mm,which leads to anNSvalue of 689 cm2for both theBrandBθprobes.The new supporting structure of PMA2 is designed to be further away from the plasma to avoid overheating and damage due to plasma bombardment.

    Due to the installation of the HFS divertor targets in early 2019,12 and 7 probe modules were removed from PMA1 and PMA2,respectively.The remaining probes from those arrays are shown by red and green rectangles in figure 1.

    2.2.In-vessel saddle-loop arrays

    Figure 2.Photographs of the initial LTCC magnetic probes used to measure the(a)radial and(b)poloidal magnetic fields(2016–2017),(c) the optimized LTCC magnetic probes (since the end of 2017).

    The number of in-vessel saddle-loop arrays has also been improved.The initial in-vessel saddle loops [14], with ten turns, were only placed at the low-field sides of ports 7 and 14, and therefore had poor toroidal resolution.Thus, following this upgrade,the spatial distribution was greatly improved from two loops to twenty-four loops.Each loop is wrapped around an in-vessel RMP coil [16] and dedicated to measuring the sign of the magnetic flux produced by the RMP coil,and hence, monitoring the RMP coils’ current direction.Also, the new in-vessel saddle loops have only a single turn;thus, the output voltage of the in-vessel saddle loops is reduced to less than 10 V.Since these sensors are installed inside the vacuum vessel and the high-frequency magnetic perturbations from MHD instabilities are not shielded by the vacuum vessel wall, it is possible for the in-vessel saddle loops to measure both high- and low-frequency magnetic perturbations.The results of measuring and calculating the amplitudes and phases of LMs using these loops are as expected.Since the signal measured by the in-vessel saddle loops is not integrated, a program has been designed to integrate the signal numerically and upload it to the data server automatically.

    3.Design and installation of the HFS Mirnov probes

    During the design of the HFS divertor target, a set of HFS Mirnov probe arrays was designed and integrated inside the supporting structure and behind the graphite target plates.Figure 3 displays the layout of these new HFS Mirnov probes in Φ andZcoordinates,while they are also shown by the cyan rectangles in figure 1 using θ and Φ coordinates.

    3.1.BZ probes

    Since the HFS parts of the two PMAs were removed after the installation of the targets,two vertical columns of probes were designed to measure the vertical magnetic fieldBZ, as a supplement to the poloidal arrays.One column with five probes is located exactly at the toroidal position of PMA2,i.e., between ports 2 and 3, and hence the full poloidal coverage of poloidal array 2 has been retained.However, the other five-probe column is located at the middle of port 10,i.e.toroidally 11.25° away from the toroidal location of PMA1.These five probes in a column are arranged vertically in theZdirection in the HFS.Among the five probes, one probe is placed in the midplane(Z=0 cm)and the other four are atZ=±4.6 and ±10.5 cm, as shown in figure 3.The poloidal angle between each probe is 7.5°,which is the same as that of PMA2.

    3.2.BR probes

    In addition to theBZprobes,three toroidal rows of probes are designed to measure the radial magnetic fieldBR, and hence detect locked modes from the HFS.The toroidal symmetries of theBZprobes are guaranteed by the symmetry of the divertor targets, which have a small inclined angle with the magnetic field lines[17]and all the leading edges are avoided due to the high installation accuracy.

    The ex-vessel saddle loops, which are routinely used to measure the radial magnetic perturbation on the low-field side(LFS), have some inherent disadvantages:

    (2) The radial magnetic field from the plasma is shielded by the vacuum vessel’s wall, and hence presents a phase shift for a rotating mode or a time delay for a growing locked mode.

    (3) The ex-vessel saddle loops have a large poloidal coverage of Δθ~90°, so it is hard to measure the highermmodes, e.g.m>2, with sufficient resolution.

    TheBRprobes were designed by taking comprehensive measures to overcome the above disadvantages.TheBRprobes are fairly small and hence have no limitation ofm,due to their poloidal coverage.The probe array is divided into two groups.One group arranged behind the divertor target plates near ports 2,6,9,and 13,i.e.90°apart from each other.Each port contains three probes,which are placed atZ=0,16,and?16 cm.The other group only contains two probes distributed in the midplanes of ports 4 and 11, 180° relative to each other in the toroidal direction.Both groups avoid the influence of magnetic perturbations produced by the RMP coils.

    To reduce the eddy current effect, the 316 stainless steel supporting plates behind the Mirnov probes are engraved with three 1 mm slits,so as to interrupt the eddy current circuit and hence improve the high-frequency response.A 1 cm-thick nylon gasket is used between the Mirnov probe and stainless steel support plate to ensure a certain distance between them,which further reduces the influence of the eddy current effect[18].The probes are installed radially 31 cm away from the magnetic axis and 5.5 cm from the boundary of the plasma,and measure larger magnetic perturbations due to their reduced separation from the plasma.

    Figure 3.The layout of the HFS Mirnov probe array designed and installed in February 2019.Red and blue rectangles represent BR and BZ probes, respectively.

    Figure 3 shows a schematic map of the newly built HFS Mirnov probe array.The red and blue rectangles representBRandBZprobes,respectively.TheNSvalues of both theBRandBZprobes,as calibrated by Helmholtz coils[19],are 689 cm2,the same as that of PMA2.

    4.Measurement of locked modes

    The Mirnov probes installed in the HFS have a much smallerNSvalue compared to the big saddle-loop sensors, which are generally used for the detection of locked modes.However,owing to the excellent toroidal symmetry of the probe installation, the integrated signal of the HFSBRprobes,BR,also shows good toroidal symmetry among the probes located at the same poloidal angle but different toroidal angles.This symmetry permits the measurement of locked modes or QSMs via the HFSBRprobes, as will be shown in the following subsections.The HFSBRprobes located atZ=16 or?16 cm measure bothBrandBθ, so a subtler analysis is needed for the locked-mode measurement.In this work, we only discuss measurement via the HFS midplaneBRprobes,which measureBr.

    In the analysis of non-rotating,or slowly rotating modes,four probes toroidally located 90° apart are required to calculate the amplitudes and phases of the modes.Signals from probes toroidally 180°apart are subtracted from each other to remove the influence of the equilibrium field and then integrated to provide then=odd component of the radial magnetic field,.Since the vectors corresponding to the two groups of signals are perpendicular to each other, then=1 radial magnetic field (due to the locked mode should be the vector sum of the two signals.

    4.1.Quasi-static mode

    Figure 4 displays a typical QSM detected by the HFS midplaneBRprobes in J-TEXT discharge #1065750.The four probes used in this session are located at the toroidal phases of φ=41.25°,131.25°,221.25°,and 311.25°(ports 2,6,9,and 13), which are 90° apart from each other.The basic plasma parameters in this shot are as follows:Ip=175 kA,Bt=2.0 T, safety factor at the plasma’s edgeqa=4.4, and the core line-averaged electron density as measured by polarimeter-interferometerne=2.0×1019m?3.As shown in figure 4(a), anm/n=2/1 high-frequency tearing mode slows down and locks at 0.12 s, leading to a QSM status.During the QSM phase, the amplitude and phase ofmeasured by the HFS midplaneBRprobes show the quasistatic features of the mode.The QSM rotates for 6 periods with an average frequency of ~20 Hz,i.e.TQSM=25–50 ms.During each period, the phase velocity of the QSM(dφn=1/dt) is variable, and the amplitude of the QSM decreases sharply when dφn=1/dtis large, e.g., at around 0.3 s.These features might be due to the interaction between the QSM and the error field (EF) [4], where the resonant component of the EF contributes an acceleration torque and a suppression effect to the QSM in a particular phase region [20, 21].

    The Grimms offer a different ending in which a huntsman happens by and rescues the grandmother and Little Red Riding Hood by disemboweling the wolf. The two females escape from the wolf unharmed, like Jonah from the belly32 of the whale. The huntsman then sews rocks back into the wolf s stomach for punishment. The huntsman in this version represents patriarchal protection and physical superiority.

    For most devices, QSMs or locked modes can only be measured at one poloidal location, and hence it is generally hard to identify the poloidal mode structure or the poloidal mode numbermof the mode.At J-TEXT, three toroidal arrays of Mirnov probes and four toroidal arrays of saddle loops are available, which makes it possible for QSMs or LMs to be measured at six poloidal locations.

    Figure 4.Detection of a slowly rotating magnetic island in discharge #1065750.(a)Mirnov signal dBθ/dt showing mode locking at 0.12 s and mode unlocking at 0.32 s.The amplitude(b)and phase(c)of the n=1 radial magnetic field(),as measured by the BR probes in the HFS midplane, show the slow rotation of the island.The two n=odd components (the blue and magenta lines) are also shown in (b).

    Figure 5.Phases of the QSM measured by magnetic diagnostics at J-TEXT.(a) Toroidal phases of measured by the BR probes in the HFS midplane(red)and three rows of in-vessel saddle loops,i.e.,LFS(blue,dotted),bottom(magenta,dashed)and top(green,dash-dotted).(b)Toroidal phases of (cyan)and (purple,dashed)measured by the Br and Bθ probes in TMA1.(c)Poloidal phases of the O-points of the QSM measured by the Bθ probes in PMA1 (red) and PMA2 (green, dashed).

    Figure 6.Contour plot of the distribution of =sin(2θ?+φ+ξO),assuming the helical phase of the 2/1 island O-point at ξO=360°,versus the phases of (green squares)and bθn=1(green dots)measured by various magnetic diagnostic arrays at t=0.18 s.The locations of the Mirnov probes are indicated by gray rectangles.The helical dashed lines represent 2/1 magnetic field lines with a maximum(black)or minimum(grey)of and a maximum (red)or minimum (blue)of .The green rectangles and dots are the maximum values of the br and bθ signals at 0.18 s measured by each group of magnetic diagnostics.

    Figure 5 displays the toroidal and poloidal phases of a QSM in discharge #1065750.The toroidal (or poloidal)phases represent the toroidal (or poloidal) locations of the maximal δbθor δbr, as measured by a toroidal (or poloidal)array.Figure 5(a)displays the toroidal phases of δbr,φn=1,br,measured by three rows of in-vessel saddle loops and the HFSBRMirnov probes, which are installed at θ=0°, 90°, 270°,and 180°, respectively.It is found that the values of φn=1,brmeasured by the top (green) and the bottom (magenta) invessel saddle loops are almost the same and have a difference of around 180° with respect to φn=1,br|θ=180°through the QSM phase from 0.12 s to 0.32 s.The φn=1,brmeasured in the LFS (blue) shows a similar trend to that of φn=1,br|θ=180°,except that it is slightly larger during the slow phase-variation duration, e.g.from 0.14 s to 0.18 s.The dependence of φn=1,bron θ indicates that the QSM has a dominant poloidal mode numbermof 2.Figure 5(b)shows the toroidal phases of δbr(φn=1,br|θ=315°, cyan) and δbθ(φn=1,bθ|θ=315°, purple)measured by the TMA1Brprobes and TMA1Bθprobes,respectively.Both phases shown in figure 5(b)have a similar trend to those of figure 5(a), and φn=1,br|θ=315°leads φn=1,bθ|θ=315°for around 90°, which is generally observed for a tearing mode.

    When QSMs are present, the 3D perturbed magnetic fields, i.e.δbθm/nand δbrm/nvary with the slow rotation of the QSMs, and hence the δbθand δbrmeasured at fixed spatial positions undergo maximums and minimums over time.By tracing the appearance of these maximums of δbθand δbrat various probes in a poloidal Mirnov array, the excursions of the poloidal phases of δbθm/nand δbrm/ncan be obtained.Figure 5(c) displays the phase of δbθmeasured at φ=259°(red, PMA1) and φ=56.25° (green, PMA2), which also represent the poloidal positions of the O-point of the magnetic island (θO).The O-point rotates in the –θ direction, which is consistent with the decrease of φn=1,bθ|θ=315°in the –φ direction.The time evolution of θOalso reflects the features of QSM as measured by the toroidal arrays, i.e.the phase velocity dθO/dtis small for a large fraction ofTQSMwhen dφn=1/dtis also small,while dθO/dtand dφn=1/dtare larger in the rest period.

    Two O-points are observed by PMA2 for a large fraction of the QSM’s rotational period,TQSM; the poloidal distance between these two O-points is around 180°.If one O-point rotates to the phase range from –150° to –210° (or 210° to 150°), e.g.from 0.188 s to 0.195 s, the remaining probes of PMA2 can no longer detect this O-point, meaning that only one O-point is observed by PMA2.The remaining probes of PMA1 only cover a poloidal range of 180°,hence it can only observe one O-point for almost all of the QSM period.At a toroidal separation of around 200°,θO|φ=259°from PMA1 has a poloidal separation of around 80°–100° with respect to θO|φ=56.25° from PMA2.This supports the statement that the QSM has a dominantmof 2.

    To visualize the helical structure of the QSM, figure 6 displays the phases of δbθ(green dots)and δbr(green squares)measured by either the toroidal or poloidal arrays at 0.18 s in figure 5,together with the 2/1 magnetic field lines in the θ-φ panel.The background contour shows the distribution of δbθ2/1=sin(2θ?+φ+ξO),where θ?is the poloidal angle in straight field-line coordinates and ξO=360° is the helical phase of the O-point.For aq=2 surface, θ?can be approximately calculated via θ?=θ?0.3sin(θ) according to the equilibrium fitting (EFIT) equilibrium.The two red (or blue) dashed lines represent the maximum (or minimum) of,while the two black(or gray)dashed lines represent the maximum (or minimum) of.It can be seen that the measured O-points(green dots)lie near the helical red dashed lines, while the measured maximal δbrlies helically near the black dashed lines.This indicates that the helical 2/1 structure of the QSM in the θ-φ panel can be accurately captured by the spatially distributed magnetic diagnostics at J-TEXT.

    Figure 7.The measurement of locked islands during RMP penetration with four different RMP phases in discharges #1061384,#1061386,#1061388, and #1061389.(a) RMP current, (b) amplitude and (c) phase of the n=1 radial magnetic field (), measured by the BRprobes in the HFS midplane.

    4.2.Locked mode due to RMP penetration

    Figure 7 shows a typical case where HFSBRMirnov probes are used to measure the plasma’s response to the RMP.In these four shots, the plasma parameters are kept the same, i.e.,Ip=180 kA,Bt=1.7 T,qa=3.5, electron densityne=1.1×1019m?3, while the RMP fields are applied using four different toroidal phases.The RMP phase,ξRMP,is defined for the dominant resonant component, the 2/1 RMP component,via its spatial distributionbr,RMP=×cos(mθ+nφ?ξRMP).ξRMPincreases by 90° successively from discharges #1061384,#1061388,and #1061389 to #1061386.The time evolution of the RMP current (IRMP) is shown in figure 7(a).IRMPramps up quickly to around 4 kA at 0.26 s and is maintained for around 30 ms to trigger the RMP penetration and the formation of a locked island.Once the locked island is excited,IRMPis reduced to a smaller value of 1–2 kA, so as to avoid disruption due to the large locked island but to retain the locked status of the excited island.From 0.3 s to 0.5 s,IRMPis increased with 3 flattops.It is found that the phase of the locked island (φn=1in figure 7(c)) increased at around 90° with the RMP phases ξRMPin these four discharges.Further analysis of the subtle changes of the island phase and amplitude evolution is ongoing to reveal the features of these locked islands and the EF.

    Figure 8 displays a comparison of then=1 radial magnetic field measured by three probe arrays, i.e.the HFSBRprobes (black), the toroidal Mirnov array at ?45°(magenta),and the LFS saddle loops(red).The amplitudes of then=1 field present similar evolutions.At 0.3–0.5 s, the measured locked island phases are different, and during the unlocking phase from 0.5 s to 0.55 s, the three phases decrease for around 360° and retain similar differences.This phase difference directly reflects the poloidal mode structure(or mode number) of the locked island.Assuming that the locked island produces ann=1 field with a distribution ofbr,island=br?cos(mθ+nφ?ξn=1),then the measuredn=1 phase at a specific toroidal probe array will be φn=1=?mθArray/n+ξn=1/n.ξn=1is the helical phase of the 2/1 island, and it is the same for all toroidal arrays.Figure 9 displays the dependence of the measured φn=1on θArrayfor the three toroidal arrays.A linear fit to the data gives a poloidal mode numberm=1.83, which is around 2.The reason why there is a gap between the measured value and 2 may be correlated with the poloidal inhomogeneity of the LM, and multiple modes may also exist.

    Figure 8.Detection of the locked mode in discharge #1061384 by three toroidal Mirnov arrays located at θ=0°, 180°, and ?45°,respectively.The (a) amplitude and (b) toroidal phase of the LM.

    Figure 9.Poloidal mode number obtained by fitting the toroidal phase to the poloidal location of the measurements.

    There are still some remaining features shown in figures 7 and 8 that need to be studied in the future.(1) At around 0.27 s in figure 8(b), there is a sharp φn=1change of~180° measured at θ=0°, which was previously explained as the plasma response transition from screening to amplification [5].However, this feature is absent in φn=1measured at θ=180° and ?45°, which remained almost constant.(2)When the RMP is off at 0.5 s, the locked islands begin to rotate and finally unlock.However, then=1 amplitude(brn=1) increases significantly at first, as shown in figures 7 and 8.This goes against the general understanding that the locked island is destabilized and excited by the RMP field,so its amplitude should reduce once the RMP is switched off.Besides,this anomalous feature is not observed in #1061388(black lines in figure 7),which might link it to an RMP phasedependent phenomenon.

    One possible cause for these two features is the presence of multiple plasma responses to the multiple poloidal harmonics of the applied RMP fields[22],e.g.the 1/1,2/1,and 3/1 fields.The combination of these responses leads to the above ‘a(chǎn)nomalous’ features.Future research will concentrate on understanding these features.

    4.3.Discussion

    This work only provides a preliminary measurement of the locked mode, and cannot simultaneously resolve several locked islands with various helicities at different rational surfaces (RSs).Future analysis will be necessary that adopts modelling using helical currents flowing at several RSs, as described in [23].

    In figure 8, the amplitude calculated by the HFSBrprobes is eight times larger compared with that of the exvessel saddle loops on the LFS.This difference is considered to be caused by spatial averaging of the ex-vessel saddle loops.The ex-vessel saddle loops at J-TEXT span 0.58 m in the poloidal direction and 0.32 m in the toroidal direction, or equivalently, approximately 0.58π radians and 0.074π radians, respectively.In the large aspect ratio, circular crosssection approximation, the attenuation factorαm n,of a measured harmonicm/ndue to spatial averaging [24]can be approximated as

    The bounds of the integral are defined by the angular coverage of each of the saddle loops described above.Thus, the amplitude of them/n=2/1 component measured by the exvessel saddle loops should be multiplied by 1 /(1?α2,1)≈5.9.In addition,the distances from HFS Mirnov probes and ex-vessel saddle loops to them/n=2/1 rational surface are different,which may also lead to a difference in the amplitudes of the measured signals.In the circular cylinder, infinite aspect ratio,and vacuum approximation,the tearing field falls off outside the rational surface where it originates, according to

    The width of the vacuum vessel wall at J-TEXT is about 20 mm, which means that the ex-vessel saddle loop is 20 mm further away from the 2/1 rational surface than the HFS Mirnov probe array.The position of the 2/1 rational surface inverted by the EFIT program, which is atR=1.259 m,in discharge #1066384 is 1.205.Thus,taking the two effects above into account, the amplitude of them/n=2/1 component measured by the HFS Mirnov probes is 7.11 times larger than that of ex-vessel saddle loops, which is close to 8.

    Besides, recent studies have shown that the phase relationship between high-frequency 2/1 and 3/1 islands, which are phase locked, might be in the range between 0 and π [25].Relevant studies of this are also necessary for locked islands,to support an understanding of locked-mode-induced disruptions.

    5.Summary

    This paper presents the current status of the magnetic diagnostics dedicated to measuring MHD instabilities at the J-TEXT tokamak.During the past four years,several changes to these arrays have emerged.The formerBrandθBprobes of poloidal magnetic probe array 2 have been replaced by a new probe with a coincidentNSvalue of 689 cm2.The spatial distribution of the in-vessel saddle loops has been greatly expanded from two loops to twenty-four loops through this upgrade.Due to the installation of HFS divertor targets in early 2019, some of the probes were removed, but an HFS Mirnov array was designed and installed behind the targets.The HFS Mirnov array provides valuable new information on the locked mode or QSM from the HFS for the first time at J-TEXT.Besides, various groups of magnetic diagnostics at different poloidal locations are used to systematically measure the QSM,giving the poloidal mode numbermand the helical structure of the QSM.By including the HFS information, the 2/1 RMP-induced locked mode was measured to have a poloidal mode number m of ~2.

    Acknowledgments

    This work was supported by the National MCF Energy R&D Program of China (No.2018YFE0309100), National Natural Science Foundation of China (NSFC) (No.11905078) and‘the Fundamental Research Funds for the Central Universities’ (No.2020kfyXJJS003).

    猜你喜歡
    李達永華
    Inatorial forecasting method considering macro and micro characteristics of chaotic traffic flow
    在武漢大學(xué)拜謁李達塑像
    李達與黨的基礎(chǔ)理論建設(shè)
    How To Get Along With Your Friends Better
    李達:為武大建設(shè)殫精竭慮
    李達與毛澤東哲學(xué)思想的體系化闡釋
    Club Recruitment
    哪把鑰匙開哪把鎖
    脾踩踏板有利于學(xué)習(xí)
    Electric Multiple Unit Bogie Maintainability Allocation with Interval Analysis and Fuzzy Evaluation Method
    国产成人福利小说| 国产乱人伦免费视频| 99热这里只有是精品50| 久久久久免费精品人妻一区二区| 国产免费男女视频| 国产乱人伦免费视频| 成人毛片a级毛片在线播放| 精品一区二区三区视频在线观看免费| 欧美又色又爽又黄视频| 国产私拍福利视频在线观看| 欧美日韩中文字幕国产精品一区二区三区| 一区二区三区免费毛片| 中文字幕精品亚洲无线码一区| 老司机福利观看| 国产精品一区二区免费欧美| 小蜜桃在线观看免费完整版高清| 又黄又爽又刺激的免费视频.| 在线播放无遮挡| 激情在线观看视频在线高清| 久久热精品热| 亚洲av.av天堂| 国产精品久久久久久精品电影| 香蕉av资源在线| 露出奶头的视频| 岛国在线免费视频观看| 国产成人影院久久av| 三级毛片av免费| 老师上课跳d突然被开到最大视频 久久午夜综合久久蜜桃 | 麻豆av噜噜一区二区三区| 高清在线国产一区| 国产午夜精品论理片| 1000部很黄的大片| 免费av毛片视频| 欧美性感艳星| 亚洲精品影视一区二区三区av| 国产麻豆成人av免费视频| 乱码一卡2卡4卡精品| 一个人看视频在线观看www免费| 一级黄色大片毛片| 国内少妇人妻偷人精品xxx网站| 搡老岳熟女国产| 精品久久国产蜜桃| 国产黄a三级三级三级人| 嫩草影院入口| 久久久国产成人精品二区| 成人一区二区视频在线观看| h日本视频在线播放| 久久精品91蜜桃| 欧美bdsm另类| 中文字幕熟女人妻在线| 久久久久国内视频| 久久草成人影院| 怎么达到女性高潮| 黄色配什么色好看| 国产一区二区三区视频了| 神马国产精品三级电影在线观看| 国产私拍福利视频在线观看| 亚洲精品粉嫩美女一区| 丰满人妻一区二区三区视频av| 又粗又爽又猛毛片免费看| 老司机深夜福利视频在线观看| 国产av麻豆久久久久久久| 日韩 亚洲 欧美在线| 日日干狠狠操夜夜爽| 亚洲av成人av| 国产一区二区激情短视频| 美女免费视频网站| 人人妻人人澡欧美一区二区| 国内精品美女久久久久久| 亚洲欧美日韩高清在线视频| 好男人在线观看高清免费视频| 亚洲欧美清纯卡通| 亚洲美女搞黄在线观看 | 免费高清视频大片| 亚洲aⅴ乱码一区二区在线播放| 亚洲欧美日韩高清专用| 亚洲五月婷婷丁香| 99久久成人亚洲精品观看| 亚洲国产精品合色在线| 国产熟女xx| 国产69精品久久久久777片| 国产亚洲av嫩草精品影院| 中文字幕精品亚洲无线码一区| 怎么达到女性高潮| 女同久久另类99精品国产91| 国产午夜精品久久久久久一区二区三区 | 色综合婷婷激情| 在线观看66精品国产| 欧美bdsm另类| 天美传媒精品一区二区| 国产成人aa在线观看| 51国产日韩欧美| 欧美另类亚洲清纯唯美| 可以在线观看毛片的网站| 夜夜夜夜夜久久久久| 免费看美女性在线毛片视频| 久久久久亚洲av毛片大全| 亚洲av中文字字幕乱码综合| 久久久久九九精品影院| 日韩欧美一区二区三区在线观看| 欧美日韩瑟瑟在线播放| 亚洲av不卡在线观看| 国产高清有码在线观看视频| 深夜a级毛片| 欧美乱色亚洲激情| 又爽又黄无遮挡网站| 日韩欧美免费精品| 婷婷精品国产亚洲av在线| 国产av麻豆久久久久久久| 精品人妻熟女av久视频| 亚洲国产精品久久男人天堂| 亚洲午夜理论影院| 精品无人区乱码1区二区| 午夜福利免费观看在线| 久久热精品热| 色综合婷婷激情| x7x7x7水蜜桃| 欧美性感艳星| 亚洲精品成人久久久久久| 亚洲欧美日韩东京热| 欧美中文日本在线观看视频| a级毛片a级免费在线| 在线观看av片永久免费下载| 午夜免费男女啪啪视频观看 | 熟妇人妻久久中文字幕3abv| 性欧美人与动物交配| 亚洲av第一区精品v没综合| 久久精品国产自在天天线| 免费av不卡在线播放| 又黄又爽又刺激的免费视频.| 精品欧美国产一区二区三| 国产三级黄色录像| 久久精品人妻少妇| netflix在线观看网站| 久久久久精品国产欧美久久久| 1024手机看黄色片| 亚洲av日韩精品久久久久久密| 人人妻人人澡欧美一区二区| 757午夜福利合集在线观看| 国产精品久久电影中文字幕| 久久午夜福利片| 男女床上黄色一级片免费看| 精品人妻偷拍中文字幕| 国产精品不卡视频一区二区 | 动漫黄色视频在线观看| 久久伊人香网站| 一本一本综合久久| 露出奶头的视频| 婷婷色综合大香蕉| 在线观看免费视频日本深夜| 夜夜躁狠狠躁天天躁| 欧美xxxx性猛交bbbb| 51午夜福利影视在线观看| 久久久成人免费电影| 我的老师免费观看完整版| 99久久99久久久精品蜜桃| 精品午夜福利视频在线观看一区| 一区二区三区四区激情视频 | 午夜福利高清视频| 久久精品国产亚洲av涩爱 | 在线观看av片永久免费下载| 欧美乱色亚洲激情| 午夜久久久久精精品| 可以在线观看的亚洲视频| 少妇裸体淫交视频免费看高清| 国产高清激情床上av| 国产午夜福利久久久久久| 国产精品人妻久久久久久| 校园春色视频在线观看| 男女视频在线观看网站免费| 国产国拍精品亚洲av在线观看| 亚洲美女黄片视频| 国产亚洲精品久久久久久毛片| h日本视频在线播放| 91午夜精品亚洲一区二区三区 | 久久久久性生活片| 亚洲精品乱码久久久v下载方式| 好看av亚洲va欧美ⅴa在| 国产一区二区三区视频了| 国产91精品成人一区二区三区| www.www免费av| 亚洲第一电影网av| 欧美不卡视频在线免费观看| 99国产极品粉嫩在线观看| 欧美一区二区亚洲| 国产人妻一区二区三区在| 非洲黑人性xxxx精品又粗又长| 久久99热6这里只有精品| 别揉我奶头 嗯啊视频| 久久人妻av系列| 久久久久久久久久成人| 国产真实伦视频高清在线观看 | 亚洲性夜色夜夜综合| 国产人妻一区二区三区在| 国产在视频线在精品| 日本成人三级电影网站| 一区福利在线观看| 国产精品自产拍在线观看55亚洲| 在线免费观看不下载黄p国产 | 欧美最黄视频在线播放免费| 欧美区成人在线视频| 国产精品一及| 免费大片18禁| 在线免费观看不下载黄p国产 | 在线观看舔阴道视频| 12—13女人毛片做爰片一| 丰满乱子伦码专区| 热99re8久久精品国产| 天堂av国产一区二区熟女人妻| 久久热精品热| 长腿黑丝高跟| 18禁黄网站禁片午夜丰满| 丁香六月欧美| 中文字幕av成人在线电影| 国产蜜桃级精品一区二区三区| 久久九九热精品免费| 精品一区二区三区av网在线观看| 久久欧美精品欧美久久欧美| 国产亚洲精品久久久com| 国产探花极品一区二区| 色哟哟·www| 国产久久久一区二区三区| 91字幕亚洲| 最近最新免费中文字幕在线| 99国产精品一区二区三区| www.999成人在线观看| 91麻豆av在线| 国产av在哪里看| 亚洲欧美清纯卡通| 日本熟妇午夜| 噜噜噜噜噜久久久久久91| 天堂影院成人在线观看| 18禁黄网站禁片免费观看直播| 99在线视频只有这里精品首页| 久久精品国产亚洲av涩爱 | 伊人久久精品亚洲午夜| 一个人免费在线观看的高清视频| 午夜精品一区二区三区免费看| av国产免费在线观看| 日韩亚洲欧美综合| 九九在线视频观看精品| 天天躁日日操中文字幕| 亚洲中文日韩欧美视频| 变态另类丝袜制服| 国产又黄又爽又无遮挡在线| 久久这里只有精品中国| 国产精品久久久久久久久免 | 91在线精品国自产拍蜜月| 久久久久久久亚洲中文字幕 | 国产精品一区二区免费欧美| 国产免费av片在线观看野外av| 久久99热6这里只有精品| 欧美日韩黄片免| 狠狠狠狠99中文字幕| 亚洲av中文字字幕乱码综合| 亚洲av成人av| 国产在线精品亚洲第一网站| 婷婷六月久久综合丁香| 欧美日韩亚洲国产一区二区在线观看| 日韩成人在线观看一区二区三区| aaaaa片日本免费| 国产一区二区三区视频了| 日韩av在线大香蕉| 国产亚洲精品综合一区在线观看| 天堂√8在线中文| 日本在线视频免费播放| 男女下面进入的视频免费午夜| 一级黄片播放器| 动漫黄色视频在线观看| 十八禁人妻一区二区| 国内精品一区二区在线观看| 一个人免费在线观看电影| 99久久精品一区二区三区| 黄色女人牲交| 免费黄网站久久成人精品 | 国产精品永久免费网站| 一a级毛片在线观看| 很黄的视频免费| 午夜福利在线观看免费完整高清在 | 99热这里只有精品一区| 五月伊人婷婷丁香| 免费看日本二区| 国产三级中文精品| bbb黄色大片| 精品一区二区三区视频在线观看免费| 中文资源天堂在线| avwww免费| 99精品久久久久人妻精品| 两性午夜刺激爽爽歪歪视频在线观看| 搡女人真爽免费视频火全软件 | 欧美日韩综合久久久久久 | 一本一本综合久久| 亚洲专区国产一区二区| 欧美黑人巨大hd| 国产免费男女视频| 国产精品自产拍在线观看55亚洲| 人人妻人人看人人澡| 国产av不卡久久| 国产aⅴ精品一区二区三区波| 少妇丰满av| 国产视频内射| av中文乱码字幕在线| 成人av在线播放网站| 亚洲 欧美 日韩 在线 免费| 一区二区三区免费毛片| 亚洲av二区三区四区| 国产黄色小视频在线观看| 免费在线观看日本一区| 十八禁网站免费在线| 亚洲天堂国产精品一区在线| 久久这里只有精品中国| 久久伊人香网站| 欧美在线黄色| 中出人妻视频一区二区| 嫩草影视91久久| 麻豆成人午夜福利视频| 亚洲第一区二区三区不卡| 18美女黄网站色大片免费观看| 日韩精品中文字幕看吧| 亚洲av第一区精品v没综合| 国产亚洲精品av在线| 九色成人免费人妻av| 99热这里只有是精品50| 亚洲精品色激情综合| 午夜久久久久精精品| 婷婷六月久久综合丁香| 久久久久精品国产欧美久久久| av欧美777| 欧美成人免费av一区二区三区| 午夜福利18| 很黄的视频免费| 日韩免费av在线播放| 精品一区二区三区视频在线| 国产精品综合久久久久久久免费| 能在线免费观看的黄片| 91午夜精品亚洲一区二区三区 | 日日摸夜夜添夜夜添小说| 亚洲国产欧洲综合997久久,| 国产综合懂色| 精品午夜福利在线看| 中文字幕人妻熟人妻熟丝袜美| avwww免费| 亚洲av不卡在线观看| 一级a爱片免费观看的视频| 女人被狂操c到高潮| 自拍偷自拍亚洲精品老妇| 国内精品久久久久久久电影| 亚洲精品一区av在线观看| 很黄的视频免费| 此物有八面人人有两片| x7x7x7水蜜桃| 亚洲成人精品中文字幕电影| 精品午夜福利视频在线观看一区| 最新中文字幕久久久久| 国产av一区在线观看免费| 一区福利在线观看| 又爽又黄a免费视频| 久久久成人免费电影| 丰满人妻熟妇乱又伦精品不卡| 久久这里只有精品中国| 亚洲天堂国产精品一区在线| 日本精品一区二区三区蜜桃| 成人欧美大片| 淫秽高清视频在线观看| 国产伦一二天堂av在线观看| 亚洲av日韩精品久久久久久密| av黄色大香蕉| 色在线成人网| 中国美女看黄片| 熟妇人妻久久中文字幕3abv| 久久精品综合一区二区三区| 国产成人啪精品午夜网站| 午夜免费成人在线视频| 最后的刺客免费高清国语| 亚洲国产精品合色在线| 欧美性感艳星| 亚洲三级黄色毛片| 久久国产乱子免费精品| 男人的好看免费观看在线视频| 在线国产一区二区在线| 九九久久精品国产亚洲av麻豆| 无人区码免费观看不卡| 精品福利观看| a级毛片a级免费在线| 久久久精品大字幕| 无遮挡黄片免费观看| 在现免费观看毛片| 一个人看视频在线观看www免费| 深夜精品福利| 中文字幕免费在线视频6| 在线观看av片永久免费下载| 天天躁日日操中文字幕| 色5月婷婷丁香| 亚洲国产欧洲综合997久久,| 直男gayav资源| 精品人妻1区二区| 18美女黄网站色大片免费观看| 日韩欧美在线乱码| www.999成人在线观看| 亚洲人成网站高清观看| 国产蜜桃级精品一区二区三区| 国产成人欧美在线观看| 国产不卡一卡二| 欧美日韩亚洲国产一区二区在线观看| 欧美午夜高清在线| 中文字幕久久专区| 最近视频中文字幕2019在线8| 天堂av国产一区二区熟女人妻| 露出奶头的视频| 国产成+人综合+亚洲专区| 最近中文字幕高清免费大全6 | 国产精品一区二区性色av| 能在线免费观看的黄片| 午夜福利18| 校园春色视频在线观看| 日韩欧美三级三区| 波多野结衣巨乳人妻| 欧美性猛交╳xxx乱大交人| 搞女人的毛片| 色精品久久人妻99蜜桃| 国产精品一区二区性色av| 18禁黄网站禁片午夜丰满| 精品人妻1区二区| 蜜桃亚洲精品一区二区三区| 丰满的人妻完整版| 99精品在免费线老司机午夜| 99国产综合亚洲精品| 国产精品乱码一区二三区的特点| 亚洲精品久久国产高清桃花| 亚洲成人久久性| 免费在线观看成人毛片| 在线观看一区二区三区| av在线老鸭窝| 90打野战视频偷拍视频| 又黄又爽又免费观看的视频| 成人无遮挡网站| 亚洲av二区三区四区| 免费观看的影片在线观看| 成人av一区二区三区在线看| 国产视频内射| 草草在线视频免费看| 99热这里只有是精品50| or卡值多少钱| 亚洲av五月六月丁香网| 久久午夜亚洲精品久久| 国产男靠女视频免费网站| 精品日产1卡2卡| 亚洲av.av天堂| 高潮久久久久久久久久久不卡| 色哟哟·www| 国产午夜精品论理片| 国产精品久久久久久人妻精品电影| 黄色女人牲交| 日韩欧美国产在线观看| 国产三级黄色录像| 亚洲欧美日韩东京热| 亚洲精品久久国产高清桃花| 日韩免费av在线播放| 国产69精品久久久久777片| 久久精品夜夜夜夜夜久久蜜豆| 国产色爽女视频免费观看| 有码 亚洲区| 欧美乱色亚洲激情| 性色avwww在线观看| 日本黄大片高清| 日本撒尿小便嘘嘘汇集6| 美女免费视频网站| 久久国产精品人妻蜜桃| 久久久精品欧美日韩精品| 婷婷亚洲欧美| 麻豆国产av国片精品| 2021天堂中文幕一二区在线观| 成熟少妇高潮喷水视频| 天堂动漫精品| 久久久久久久久久成人| 桃红色精品国产亚洲av| 日本五十路高清| 中文字幕免费在线视频6| 国产成年人精品一区二区| 亚洲午夜理论影院| 色精品久久人妻99蜜桃| 在线观看av片永久免费下载| 欧美成人免费av一区二区三区| 丰满人妻一区二区三区视频av| 亚洲av中文字字幕乱码综合| 欧美zozozo另类| 999久久久精品免费观看国产| 99热6这里只有精品| 久久精品久久久久久噜噜老黄 | 精品人妻偷拍中文字幕| 亚洲av不卡在线观看| 深夜精品福利| 亚洲,欧美,日韩| 久久久久国内视频| 久久久久亚洲av毛片大全| 国产成人啪精品午夜网站| 国产av不卡久久| 一个人看视频在线观看www免费| 日韩高清综合在线| 午夜免费成人在线视频| 精品久久久久久久久久久久久| 国产一区二区亚洲精品在线观看| 婷婷亚洲欧美| 欧美日韩福利视频一区二区| 国产不卡一卡二| 中文字幕久久专区| 日日干狠狠操夜夜爽| 亚洲精品在线美女| 成人鲁丝片一二三区免费| 国产91精品成人一区二区三区| 人人妻人人看人人澡| 天天躁日日操中文字幕| 成人国产一区最新在线观看| 亚洲国产精品久久男人天堂| 丰满乱子伦码专区| .国产精品久久| 国产淫片久久久久久久久 | av在线天堂中文字幕| 欧美高清成人免费视频www| 国产精品爽爽va在线观看网站| 免费无遮挡裸体视频| 精品熟女少妇八av免费久了| eeuss影院久久| 高潮久久久久久久久久久不卡| 欧美日韩乱码在线| 欧美日韩黄片免| 久久草成人影院| 波多野结衣高清作品| 日日摸夜夜添夜夜添av毛片 | 国内久久婷婷六月综合欲色啪| 久久久久久国产a免费观看| 国产白丝娇喘喷水9色精品| 可以在线观看的亚洲视频| 国内揄拍国产精品人妻在线| a级一级毛片免费在线观看| 久久亚洲真实| 波多野结衣高清无吗| 欧美国产日韩亚洲一区| 久久久精品欧美日韩精品| 欧美日韩综合久久久久久 | 尤物成人国产欧美一区二区三区| 亚洲最大成人av| 久久国产精品影院| xxxwww97欧美| 亚洲av免费在线观看| 亚洲,欧美,日韩| 欧美成狂野欧美在线观看| 成人三级黄色视频| 免费观看精品视频网站| 亚洲黑人精品在线| 日韩精品青青久久久久久| 日本三级黄在线观看| 90打野战视频偷拍视频| 午夜两性在线视频| 色视频www国产| 日本精品一区二区三区蜜桃| 欧美日韩瑟瑟在线播放| 国产美女午夜福利| 亚洲综合色惰| 久久久久久久久久成人| 好男人在线观看高清免费视频| 久久精品国产自在天天线| a级一级毛片免费在线观看| 久久天躁狠狠躁夜夜2o2o| 亚洲精品亚洲一区二区| 欧美另类亚洲清纯唯美| 综合色av麻豆| 亚洲 欧美 日韩 在线 免费| 如何舔出高潮| 欧美日韩中文字幕国产精品一区二区三区| 一个人看的www免费观看视频| 非洲黑人性xxxx精品又粗又长| 国产91精品成人一区二区三区| 久久久久久久久久成人| 一级作爱视频免费观看| 国产免费av片在线观看野外av| 亚洲无线观看免费| 亚洲av免费高清在线观看| 色噜噜av男人的天堂激情| 色综合婷婷激情| 午夜福利视频1000在线观看| 亚洲自拍偷在线| 日韩大尺度精品在线看网址| 国产精品久久久久久人妻精品电影| 波多野结衣高清无吗| 又黄又爽又刺激的免费视频.| 日日干狠狠操夜夜爽| 亚洲 国产 在线| 国产综合懂色| 国产高清有码在线观看视频| 又粗又爽又猛毛片免费看| 最近最新中文字幕大全电影3| 最近中文字幕高清免费大全6 | 久久精品久久久久久噜噜老黄 | 五月伊人婷婷丁香| 赤兔流量卡办理| 久久性视频一级片| 欧美bdsm另类| 91在线观看av| 禁无遮挡网站| 一区福利在线观看| 亚洲国产日韩欧美精品在线观看| 精品欧美国产一区二区三| 搡女人真爽免费视频火全软件 | 精品日产1卡2卡| 90打野战视频偷拍视频| 999久久久精品免费观看国产| 国产精品久久电影中文字幕| 18禁在线播放成人免费| 12—13女人毛片做爰片一| 久久久久精品国产欧美久久久| 嫩草影院新地址| 波多野结衣高清无吗| 夜夜躁狠狠躁天天躁| 精品久久久久久久末码|