欢迎访问沈阳真空杂志社 Email Alert    RSS服务

VACUUM ›› 2022, Vol. 59 ›› Issue (6): 65-72.doi: 10.13385/j.cnki.vacuum.2022.06.12

• Measurement and Control • Previous Articles     Next Articles

Experimental Study of Taylor Discharge Cleaning for J-TEXT Device

BA Wei-gang, CHEN Zhi-peng, ZHAO Qian-cheng, HAO Zhi-gang, DING Yong-hua, PAN Yuan   

  1. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2022-01-13 Online:2022-11-25 Published:2022-12-05

Abstract: Due to the line radiation generated by light impurities in the Tokamak vacuum chamber, plasma energy is lost and hydrogen fuel concentration is reduced. Therefore, in order to improve the triple product of fusion, it is necessary to reduce the content of light impurities in the Tokamak vacuum chamber to a low level before the discharge starts. Light impurity elements are mainly adsorbed on the first wall of the device. At present,the impurities adsorbed on the first wall are desorbed mainly by means of discharge cleaning. In this paper, a set of differential pumping mass spectrometer analysis system is established, which can be used in Taylor discharge cleaning of J-TEXT Tokamak device. The higher pressure gas in the main vacuum chamber is introduced into the mass spectrometer chamber equipped with differential pumping system for analysis, so as to obtain the change of partial pressure of each gas in the cleaning process, which can be used to monitor the discharge cleaning effect. At the same time, by combining with several diagnostic systems such as magnetic measurement, electrostatic probe, Hα radiation and CⅢ radiation, the changes of plasma current, voltage, temperature, density and radiation in the discharge cleaning process are measured when changing the discharge cleaning parameters, providing reference for the optimization of J-TEXT hydrogen Taylor discharge cleaning parameters.

Key words: Taylor discharge cleaning, differential pumping, mass spectrometer analysis, parameter optimization

CLC Number: 

  • TL6
[1] 朱毓坤. 核真空科学技术[M]. 北京: 原子能出版社, 2010.
[2] DYLLA H F. A review of the wall problem and conditioning techniques for tokamaks[J]. Journal of Nuclear Materials, 1980, 93/94: 61-74.
[3] DYLLA H F, COHEN S A, ROSSNAGEL S M, et al.Glow discharge conditioning of the PDX vacuum vessel[J]. Journal of Vacuum Science and Technology, 1980, 17(1): 286-290.
[4] WINTER J, WAELBROECK F, WIENHOLD P, et al. Wall conditioning of TEXTOR[J]. Journal of Nuclear Materials, 1984, 128/129: 841-850.
[5] NAKASHIMA Y, ICHIMURA M, IMAI Y, et al.Improvement of wall conditioning of the tandem mirror GAMMA 10 by ECR discharge cleaning[J]. Journal of Nuclear Materials, 1989, 162: 812-817.
[6] MCCRACKEN G M, STOTT P E.Plasma-surface interactions in tokamaks[J]. Nuclear Fusion, 1979, 19(7): 889.
[7] FEDERICI G, SKINNER C H, BROOKS J N, et al.Plasma-material interactions in current tokamaks and their implications for next step fusion reactors[J]. Nuclear Fusion, 2001, 41(12): 1967.
[8] OREN L, TAYLOR R J.Trapping and removal of oxygen in tokamaks[J]. Nuclear Fusion, 1977, 17(6): 1143.
[9] 辜学茂, 王小明, 秦品建, 等. HT-7U超导托卡马克抽充气系统设计[C]//华东三省一市真空学术交流会, 2000.
[10] 胡庆生. HT-7U超导托卡马克装置真空抽气系统的设计与研究[D]. 合肥: 合肥工业大学, 2003.
[11] 李加宏, 胡建生, 王小明, 等. EAST超导托卡马克装置真空抽气系统[J]. 真空, 2010, 47(1): 11-14.
[12] KIM K P, LEE K S, YANG H L, et al.Overview of the KSTAR vacuum pumping system[J]. Fusion Engineering and Design, 2009, 84(2-6): 1038-1042.
[13] 李加宏, 胡建生, 王小明, 等. EAST超导托卡马克装置真空室壁处理的研究[J]. 物理学报, 2012, 61(20): 310-316.
[14] KIM K M, YANG H L, HONG S H, et al.Wall conditioning of the KSTAR vacuum vessel[J]. Fusion Engineering and Design, 2009, 84(2-6): 1026-1028.
[15] 孟月东, 何也熙, 杨道文, 等. HT-7超导托卡马克泰勒放电清洗实验研究[J]. 真空科学与技术, 1996, 16(5): 367-371.
[16] 丁永华. J-TEXT托卡马克主机安装及磁测量系统的建立[D]. 武汉: 华中科技大学, 2009.
[17] O′HANLON J F. A user′s guide to vacuumtechnology[M]. 3rd ed. New York: John Wiley & Sons Inc, 2003.
[18] WINTER J.Wall conditioning in fusion devices and its influence on plasma performance[J]. Plasma Physics and Controlled Fusion, 1999, 38(9): 1503.
[19] PHILIPPS V, VIETZKE E, ERDWEG M, et al.Thermal desorption of hydrogen and various hydrocarbons from graphite bombarded with thermal and energetic hydrogen[J]. Journal of Nuclear Materials, 1987, 145: 292-296.
[20] DIETZ K J, WAELBROECK F, WIENHOLD P. Origin of impurities in hydrogen plasmas[R/OL]. Kernforschungsanlage Juelich, 1977. http://hdl.handle.net/2128/16999.
[21] VIETZKE E, REFKE A, PHILIPPS V, et al.Energy distributions of the reaction products from graphite and B4C during energetic oxygen impact[J]. Journal of nuclear materials, 1995, 220: 249-253.
No related articles found!
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] LI De-tian, CHENG Yong-jun, ZHANG Hu-zhong, SUN Wen-jun, WANG Yong-jun, SUN Jian, LI Gang, . Preparations and applications of carbon nanotube field emitters[J]. VACUUM, 2018, 55(5): 1 -9 .
[2] ZHOU Bin-bin, ZHANG jian, HE Jian-feng, DONG Chang-kun. Carbon nanotube field emission cathode based on direct growth technique[J]. VACUUM, 2018, 55(5): 10 -14 .
[3] LI Zhi-sheng. Development of ultra large shielded door for infrared calibration in simulated space environment[J]. VACUUM, 2018, 55(5): 66 -70 .
[4] ZHENG Lie, LI Hong. Design of 200kV/2mA continuous adjustable DC high voltage generator[J]. VACUUM, 2018, 55(6): 10 -13 .
[5] CHAI Xiao-tong, WANG Liang, WANG Yong-qing, LIU Ming-kun, LIU Xing-zhou, GAN Shu-yi. Operating parameter data acquisition system for single vacuum pump based on STM32F103 microcomputer[J]. VACUUM, 2018, 55(5): 15 -18 .
[6] SUN Li-zhi, YAN Rong-xin, LI Tian-ye, JIA Rui-jin, LI Zheng, SUN Li-chen, WANG Yong, WANG Jian, . Research on distributing law of Xenon in big accumulation chamber[J]. VACUUM, 2018, 55(5): 38 -41 .
[7] HUANG Si, WANG Xue-qian, MO Yu-shi, ZHANG Zhan-fa, YING Bing. Experimental study on similarity law of liquid ring compressor performances[J]. VACUUM, 2018, 55(5): 42 -45 .
[8] JI Ming, SUN Liang, YANG Min-bo. Design of automatic sealing and locking scheme for lunar sample[J]. VACUUM, 2018, 55(6): 24 -27 .
[9] LI Min-jiu, XIONG Tao, JIANG Ya-lan, HE Yan-bin, CHEN Qing-chuan. 20kV high voltage based on double transistor forward converter pulse power supply for metal deburring[J]. VACUUM, 2018, 55(5): 19 -24 .
[10] LIU Yan-wen, MENG Xian-zhan, TIAN Hong, LI Fen, SHI Wen-qi, ZHU Hong, GU Bing. Test of ultra high vacuum in space traveling-wave tube[J]. VACUUM, 2018, 55(5): 25 -28 .