Triple-probe Diagnostic Measurements in Plasma of GLAST Spherical Tokamak

详细信息    查看全文

• 作者：A. Qayyum ; S. Ahmad ; R. Khan ; S. Hussain ; F. Deeba ; M. A. Javed…
• 关键词：Triple Langmuir probe ; Time ; resolved plasma measurements ; Glass Spherical Tokamak (GLAST) ; ECRH ; assisted pre ; ionization ; RF power coupling
• 刊名：Journal of Fusion Energy
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：35
• 期：2
• 页码：205-213
• 全文大小：1,202 KB
• 参考文献：1.T.K. Popov, P. Ivanova, M. Dimitrova, J. Kovacic, T. Gyergyek, M. Cercek, Plasma Sources Sci. Technol. 21, 025004 (2012)ADS CrossRef
  2.N. Hershkowitz, Phys. Plasmas 12, 055502 (2005)ADS CrossRef
  3.S.L. Chen, T. Sekiguchi, J. Appl. Phys. 36, 2363 (1965)ADS CrossRef
  4.C. Riccardi, G. Longoni, G. Chiodini, M. Fontanesi, Rev. Sci. Instrum. 72, 461 (2001)ADS CrossRef
  5.R.L. Merlino, Am. J. Phys. 75, 1078 (2007)ADS CrossRef
  6.S.G. Lee, J.G. Bak, Rev. Sci. Instrum. 72, 442 (2001)ADS CrossRef
  7.P.M. Bryant, S.A. Voronin, J.W. Bradley, A. Vetushka, J. Appl. Phys. 102, 043302 (2007)ADS CrossRef
  8.H. Ji, H. Toyama, K. Yamagishi, S. Shinohara, A. Fujisawa, K. Miyamoto, Rev. Sci. Instrum. 62, 2326 (1991)ADS CrossRef
  9.Y. Qin, Rev. Sci. Instrum. 76, 116102 (2005)ADS CrossRef
  10.C. Riccardi, G. Longoni, G. Chiodini, M. Fontanesi, Rev. Sci. Instrum. 72, 461 (2001)ADS CrossRef
  11.A. Qayyum, S. Ahmad, N. Ahmad, F. Deeba, S. Hussain, J. Fusion Energ. 34, 405 (2015)CrossRef
  12.T. Enling, X. Shenghai, Y. Minghai, L. Lexin, Plasma Sci. Technol. 14, 747 (2012)CrossRef
  13.C. Theiler, I. Furno, A. Kuenlin, Ph Marmillod, A. Fasoli, Rev. Sci. Instrum. 82, 013504 (2011)ADS CrossRef
  14.S. Oldenburger, S. Inagaki, T. Kobayashi, H. Arakawa, N. Ohyama, K. Kawashima, Y. Tobimatsu, A. Fujisawa, K. Itoh, S.-I. Itoh, Plasma Phys. Control. Fusion 54, 055002 (2012)ADS CrossRef
  15.A. Qayyum, N. Ahmad, S. Ahmad, F. Deeba, R. Ali, S. Hussain, Rev. Sci. Instrum. 84, 123502 (2013)ADS CrossRef
  16.J.-C. Seol, B.H. Park, S.S. Kim, J.Y. Kim, Y.-S. Na, Nucl. Fusion 50, 105008 (2010)ADS CrossRef
  17.K. Kajiwara, Y. Ikeda, M. Seki, S. Moriyama, T. Oikawa, T. Fujii, JT-60 Team, Nucl. Fusion 45, 694 (2005)ADS CrossRef
  18.B. Lloyd, G.L. Jackson, T.S. Taylor, E.A. Lazarus, T.C. Luce, R. Prater, Nucl. Fusion 31, 2031 (1991)CrossRef
  19.S. Zheng, X. Yang, D. Jiang, X. Yao, C. Feng, D. Jiang, T. Fang, L. Wang, Nucl. Fusion 40, 155 (2000)ADS CrossRef
  20.F.U. Jia, L. Yingying, S. Yuejiang, W. Fudi, Z. Wei, L.V. Bo, H. Juan, W. Baonian, Z. Qian, Plasma Sci. Technol. 14, 1048 (2012)CrossRef
  
• 作者单位：A. Qayyum (1)
  S. Ahmad (1)
  R. Khan (1)
  S. Hussain (1)
  F. Deeba (1)
  M. A. Javed (1)
  N. Ahmed (1)
  Rafaqat Ali (1)
  S. Mehmood (1)
  
  1. National Tokamak Fusion Program (NTFP), P.O. Box 3329, Islamabad, Pakistan
  
• 刊物类别：Engineering
• 刊物主题：Nuclear Engineering
  
• 出版者：Springer Netherlands
• ISSN：1572-9591

文摘

Triple-probe has been developed and operated successfully to characterize ECRH-assisted argon as well as hydrogen microwave plasmas in GLAST Spherical Tokamak. This technique enables to determine transient plasma parameters such as floating potential, electron temperature and electron number density in rapidly time-varying plasmas. An effective electron heating mechanism is applied to produce microwave plasma by injecting radiofrequency (RF) radiation at a frequency of 2.45 GHz in the presence of resonant toroidal magnetic field. Plasma parameters and corresponding fluctuations are measured as a function of time in different gas fill pressures for various applied magnetic fields. The results demonstrate the dependence of plasma parameters such as V _f , T _e , n _e and their fluctuations on gas fill pressure during the pre-ionization phase of the GLAST operation. Plasma behavior is observed to be closely depending on the coupling of RF power during microwave discharge. Additionally, the hydrogen plasma shows pronounced fluctuations in comparison with argon plasma with some decrease in electron temperature and densities.