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Title: Upgrade of Langmuir probe diagnostic in ITER-like tungsten mono-block divertor on experimental advanced superconducting tokamak

Abstract

In order to withstand rapid increase in particle and power impact onto the divertor and demonstrate the feasibility of the ITER design under long pulse operation, the upper divertor of the EAST tokamak has been upgraded to actively water-cooled, ITER-like tungsten mono-block structure since the 2014 campaign, which is the first attempt for ITER on the tokamak devices. Therefore, a new divertor Langmuir probe diagnostic system (DivLP) was designed and successfully upgraded on the tungsten divertor to obtain the plasma parameters in the divertor region such as electron temperature, electron density, particle and heat fluxes. More specifically, two identical triple probe arrays have been installed at two ports of different toroidal positions (112.5-deg separated toroidally), which can provide fundamental data to study the toroidal asymmetry of divertor power deposition and related 3-dimension (3D) physics, as induced by resonant magnetic perturbations, lower hybrid wave, and so on. The shape of graphite tip and fixed structure of the probe are designed according to the structure of the upper tungsten divertor. The ceramic support, small graphite tip, and proper connector installed make it possible to be successfully installed in the very narrow interval between the cassette body and tungsten mono-block, i.e., 13.5 mm.more » It was demonstrated during the 2014 and 2015 commissioning campaigns that the newly upgraded divertor Langmuir probe diagnostic system is successful. Representative experimental data are given and discussed for the DivLP measurements, then proving its availability and reliability.« less

Authors:
; ; ;  [1];  [2]; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1];  [1] more »;  [3] « less
  1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)
  2. (China)
  3. (United States)
Publication Date:
OSTI Identifier:
22597679
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONNECTORS; DESIGN; DIVERTORS; ELECTRON DENSITY; ELECTRON TEMPERATURE; ELECTRONS; GRAPHITE; HEAT; HEAT FLUX; HT-7U TOKAMAK; ITER TOKAMAK; LANGMUIR PROBE; LOWER HYBRID CURRENT DRIVE; LOWER HYBRID HEATING; OPERATION; PARTICLES; PERTURBATION THEORY; TUNGSTEN; WATER; WATER COOLED REACTORS

Citation Formats

Xu, J. C., Jia, M. N., Feng, W., Deng, G. Z., Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230031, Wang, L., E-mail: wliang@ipp.ac.cn, Xu, G. S., Luo, G. N., Yao, D. M., Li, Q., Cao, L., Chen, L., Zhang, W., Liu, S. C., Wang, H. Q., Hu, L. Q., Wan, B. N., Li, J., Sun, Y. W., Guo, H. Y., and General Atomics, P.O. Box 85608, San Diego, California 92186. Upgrade of Langmuir probe diagnostic in ITER-like tungsten mono-block divertor on experimental advanced superconducting tokamak. United States: N. p., 2016. Web. doi:10.1063/1.4960181.
Xu, J. C., Jia, M. N., Feng, W., Deng, G. Z., Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230031, Wang, L., E-mail: wliang@ipp.ac.cn, Xu, G. S., Luo, G. N., Yao, D. M., Li, Q., Cao, L., Chen, L., Zhang, W., Liu, S. C., Wang, H. Q., Hu, L. Q., Wan, B. N., Li, J., Sun, Y. W., Guo, H. Y., & General Atomics, P.O. Box 85608, San Diego, California 92186. Upgrade of Langmuir probe diagnostic in ITER-like tungsten mono-block divertor on experimental advanced superconducting tokamak. United States. doi:10.1063/1.4960181.
Xu, J. C., Jia, M. N., Feng, W., Deng, G. Z., Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230031, Wang, L., E-mail: wliang@ipp.ac.cn, Xu, G. S., Luo, G. N., Yao, D. M., Li, Q., Cao, L., Chen, L., Zhang, W., Liu, S. C., Wang, H. Q., Hu, L. Q., Wan, B. N., Li, J., Sun, Y. W., Guo, H. Y., and General Atomics, P.O. Box 85608, San Diego, California 92186. Mon . "Upgrade of Langmuir probe diagnostic in ITER-like tungsten mono-block divertor on experimental advanced superconducting tokamak". United States. doi:10.1063/1.4960181.
@article{osti_22597679,
title = {Upgrade of Langmuir probe diagnostic in ITER-like tungsten mono-block divertor on experimental advanced superconducting tokamak},
author = {Xu, J. C. and Jia, M. N. and Feng, W. and Deng, G. Z. and Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230031 and Wang, L., E-mail: wliang@ipp.ac.cn and Xu, G. S. and Luo, G. N. and Yao, D. M. and Li, Q. and Cao, L. and Chen, L. and Zhang, W. and Liu, S. C. and Wang, H. Q. and Hu, L. Q. and Wan, B. N. and Li, J. and Sun, Y. W. and Guo, H. Y. and General Atomics, P.O. Box 85608, San Diego, California 92186},
abstractNote = {In order to withstand rapid increase in particle and power impact onto the divertor and demonstrate the feasibility of the ITER design under long pulse operation, the upper divertor of the EAST tokamak has been upgraded to actively water-cooled, ITER-like tungsten mono-block structure since the 2014 campaign, which is the first attempt for ITER on the tokamak devices. Therefore, a new divertor Langmuir probe diagnostic system (DivLP) was designed and successfully upgraded on the tungsten divertor to obtain the plasma parameters in the divertor region such as electron temperature, electron density, particle and heat fluxes. More specifically, two identical triple probe arrays have been installed at two ports of different toroidal positions (112.5-deg separated toroidally), which can provide fundamental data to study the toroidal asymmetry of divertor power deposition and related 3-dimension (3D) physics, as induced by resonant magnetic perturbations, lower hybrid wave, and so on. The shape of graphite tip and fixed structure of the probe are designed according to the structure of the upper tungsten divertor. The ceramic support, small graphite tip, and proper connector installed make it possible to be successfully installed in the very narrow interval between the cassette body and tungsten mono-block, i.e., 13.5 mm. It was demonstrated during the 2014 and 2015 commissioning campaigns that the newly upgraded divertor Langmuir probe diagnostic system is successful. Representative experimental data are given and discussed for the DivLP measurements, then proving its availability and reliability.},
doi = {10.1063/1.4960181},
journal = {Review of Scientific Instruments},
number = 8,
volume = 87,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2016},
month = {Mon Aug 15 00:00:00 EDT 2016}
}