Measurement and analyses of the mean effective ion charge in the centre of tokamak discharges

doi:10.1088/1009-1963/16/4/037

Abstract

Abstract There are two different definitions for specifying the mean effective ion charge Z_eff in plasmas: a) from the Spizer electrical resistivity of the plasma and b) from bremsstrahlung radiation losses of the plasma. In this paper Z_eff in the centre of tokamak ohmic discharges has been determined from information on sawtooth-relaxations of the steady state plasma, based on the analysis for the power balance of the plasma electrons in the plasma centre during the period of recovery after the sawtooth crashes. This method is found to supply reliable results for tokamak parameters. While its application requires some efforts in data analysis, it can provide a reliable determination of Z_eff, independent of the information from bremsstrahlung radiation losses of the plasma.

Keywords: mean effective ion charge sawtooth relaxation power balance of plasma electrons

Received: 14 August 2006
Revised: 30 August 2006
Accepted manuscript online:

PACS:	52.55.Fa	(Tokamaks, spherical tokamaks)
	52.25.Fi	(Transport properties)
	52.80.-s	(Electric discharges)

Fund: Project supported by the Nuclear Science Foundation (Grant No1997517).

Cite this article:

Zheng Yong-Zhen(郑永真), Ding Xuan-Tong(丁玄同), and Zhuo Yan(周艳) Measurement and analyses of the mean effective ion charge in the centre of tokamak discharges 2007 Chinese Physics 16 1084

[1]	Upgrade of the magnetic diagnostic system for restart of HT-6M operation Li-Xing Chen(陈力行), Biao Shen(沈飊), Da-Long Chen(陈大龙), Zheng-Ping Luo(罗正平),Zu-Chao Zhang(张祖超), Ying Chen(陈颖), Yong Wang(王勇), and Jin-Ping Qian(钱金平). Chin. Phys. B, 2022, 31(12): 125203.
[2]	Evolution of the high-field-side radiation belts during the neon seeding plasma discharge in EAST tokamak Ji-Chan Xu(许吉禅), Liang Wang(王亮), Guo-Sheng Xu(徐国盛), Yan-Min Duan(段艳敏), Ling-Yi Meng(孟令义), Ke-Dong Li(李克栋), Fang Ding(丁芳), Rui-Rong Liang(梁瑞荣), Jian-Bin Liu(刘建斌), and EAST Team. Chin. Phys. B, 2022, 31(10): 105203.
[3]	Parametric decay instabilities of lower hybrid waves on CFETR Taotao Zhou(周涛涛), Nong Xiang(项农), Chunyun Gan(甘春芸), Guozhang Jia(贾国章), and Jiale Chen(陈佳乐). Chin. Phys. B, 2022, 31(9): 095201.
[4]	Numerical simulation of fueling pellet ablation and transport in the EAST H-mode discharge Wan-Ting Chen(陈婉婷), Ji-Zhong Sun(孙继忠), Fang Gao(高放), Lei Peng(彭磊), and De-Zhen Wang(王德真). Chin. Phys. B, 2022, 31(7): 075204.
[5]	Experimental investigation on divertor tungsten sputtering with neon seeding in ELMy H-mode plasma in EAST tokamak Dawei Ye(叶大为), Fang Ding(丁芳), Kedong Li(李克栋), Zhenhua Hu(胡振华), Ling Zhang(张凌), Xiahua Chen(陈夏华), Qing Zhang(张青), Pingan Zhao(赵平安), Tao He(贺涛), Lingyi Meng(孟令义), Kaixuan Ye(叶凯萱), Fubin Zhong(钟富彬), Yanmin Duan(段艳敏), Rui Ding(丁锐), Liang Wang(王亮), Guosheng Xu(徐国盛), Guangnan Luo(罗广南), and EAST team. Chin. Phys. B, 2022, 31(6): 065201.
[6]	The intermittent excitation of geodesic acoustic mode by resonant Instanton of electron drift wave envelope in L-mode discharge near tokamak edge Zhao-Yang Liu(刘朝阳), Yang-Zhong Zhang(章扬忠), Swadesh Mitter Mahajan, A-Di Liu(刘阿娣), Chu Zhou(周楚), and Tao Xie(谢涛). Chin. Phys. B, 2022, 31(4): 045202.
[7]	Neoclassical tearing mode stabilization by electron cyclotron current drive for HL-2M tokamak Jing-Chun Li(李景春), Jia-Qi Dong(董家齐), Xiao-Quan Ji(季小全), and You-Jun Hu(胡友俊). Chin. Phys. B, 2021, 30(7): 075203.
[8]	Tests of the real-time vertical growth rate calculation on EAST Na-Na Bao(鲍娜娜), Yao Huang(黄耀), Jayson Barr, Zheng-Ping Luo(罗正平), Yue-Hang Wang(汪悦航), Shu-Liang Chen(陈树亮), Bing-Jia Xiao(肖炳甲), David Humphreys. Chin. Phys. B, 2020, 29(6): 065204.
[9]	Nonlinear simulation of multiple toroidal Alfvén eigenmodes in tokamak plasmas Xiao-Long Zhu(朱霄龙), Feng Wang(王丰), Zheng-Xiong Wang(王正汹). Chin. Phys. B, 2020, 29(2): 025201.
[10]	Discharge simulation and volt-second consumption analysis during ramp-up on the CFETR tokamak Cheng-Yue Liu(刘成岳), Bin Wu(吴斌), Jin-Ping Qian(钱金平), Guo-Qiang Li(李国强), Ya-Wei Hou(侯雅巍), Wei Wei(韦维), Mei-Xia Chen(陈美霞), Ming-Zhun Lei(雷明准), Yong Guo(郭勇). Chin. Phys. B, 2020, 29(2): 025202.
[11]	Estimation of plasma equilibrium parameters via a neural network approach Zi-Jian Zhu(朱子健), Yong Guo(郭勇), Fei Yang(杨飞), Bing-Jia Xiao(肖炳甲), Jian-Gang Li(李建刚). Chin. Phys. B, 2019, 28(12): 125204.
[12]	Effect of edge transport barrier on required toroidal field for ignition of elongated tokamak Cui-Kun Yang(杨翠坤), Ming-Sheng Chu(朱名盛), Wen-Feng Guo(郭文峰). Chin. Phys. B, 2019, 28(4): 045202.
[13]	Numerical study of influence of J×B force on melt layer under conditions relevant to ITER ELMs Yan Huang(黄艳), Ji-Zhong Sun(孙继忠), Juan Cai(蔡娟), Zhen-Yue Sun(孙振月), Chao-Feng Sang(桑超峰), De-Zhen Wang(王德真). Chin. Phys. B, 2019, 28(4): 045201.
[14]	Investigation on the drives of the poloidal flow in the ohmic and biased electrode experiments Yi Yu(余羿), Tao Lan(兰涛), Min Xu(许敏), Yizhi Wen(闻一之). Chin. Phys. B, 2019, 28(3): 035202.
[15]	Radiative divertor behavior and physics in Ar seeded plasma on EAST Jingbo Chen(陈竞博), Yanmin Duan(段艳敏), Zhongshi Yang(杨钟时), Liang Wang(王亮), Kai Wu(吴凯), Kedong Li(李克栋), Fang Ding(丁芳), Hongmin Mao(毛红敏), Jichan Xu(许吉禅), Wei Gao(高伟), Ling Zhang(张凌), Jinhua Wu(吴金华), Guang-Nan Luo(罗广南), EAST Team. Chin. Phys. B, 2017, 26(9): 095205.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Metrics
Related Articles

Measurement and analyses of the mean effective ion charge in the centre of tokamak discharges

Cite this article:

Online attention