New dual gas puff imaging system with up-down symmetry on experimental advanced superconducting tokamak

S. C. Liu, L. M. Shao, S. J. Zweben, G.S. Xu, H. Y. Guo, B. Cao, H. Q. Wang, L. Wang, Ning Yan, S. B. Xia, W. Zhang, R. Chen, L. Chen, S. Y. Ding, H. Xiong, Y. Zhao, B. N. Wan, X. Z. Gong, X. Gao

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Gas puff imaging (GPI) offers a direct and effective diagnostic to measure the edge turbulence structure and velocity in the edge plasma, which closely relates to edge transport and instability in tokamaks. A dual GPI diagnostic system has been installed on the low field side on experimental advanced superconducting tokamak (EAST). The two views are up-down symmetric about the midplane and separated by a toroidal angle of 66.6 degrees. A linear manifold with 16 holes apart by 10 mm is used to form helium gas cloud at the 130x130 mm (radial versus poloidal) objective plane. A fast camera is used to capture the light emission from the image plane with a speed up to 390 804 frames/s with 64x64 pixels and an exposure time of 2.156 mu s. The spatial resolution of the system is 2 mm at the objective plane. A total amount of 200 Pa.L helium gas is puffed into the plasma edge for each GPI viewing region for about 250 ms. The new GPI diagnostic has been applied on EAST for the first time during the recent experimental campaign under various plasma conditions, including ohmic, L-mode, and type-I, and type-III ELMy H-modes. Some of these initial experimental results are also presented. © 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770122]
Original languageEnglish
JournalReview of Scientific Instruments
Volume83
Issue number12
Pages (from-to)123506
Number of pages7
ISSN0034-6748
DOIs
Publication statusPublished - 2012

Keywords

  • INSTRUMENTS
  • PHYSICS,
  • ALCATOR C-MOD
  • EDGE TURBULENCE
  • BOUNDARY PLASMA
  • OFF-LAYER
  • FLUCTUATIONS
  • SIMULATIONS
  • TRANSPORT
  • BEHAVIOR
  • CAMERA

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