Equilibrium reconstruction based on core magnetic measurement and its applications on equilibrium transition in Joint-TEXT tokamak

Journal Article · Wed Oct 15 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4896476· OSTI ID:22305886

Chen, J.; Jian, X.; Li, Q.; Liu, Y.; Gao, L.; Wang, Z. J. ^[1]

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1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China)

Evaluation and reconstruction of plasma equilibrium, especially to resolve the safety factor profile, is imperative for advanced tokamak operation and physics study. Based on core magnetic measurement by the high resolution laser polarimeter-interferometer system (POLARIS), the equilibrium of Joint-TEXT (J-TEXT) plasma is reconstructed and profiles of safety factor, current density, and electron density are, therefore, obtained with high accuracy and temporal resolution. The equilibrium reconstruction procedure determines the equilibrium flux surfaces essentially from the data of POLARIS. Refraction of laser probe beam, a major error source of the reconstruction, has been considered and corrected, which leads to improvement of accuracy more than 10%. The error of reconstruction has been systematically assessed with consideration of realistic diagnostic performance and scrape-off layer region of plasma, and its accuracy has been verified. Fast equilibrium transitions both within a single sawtooth cycle and during the penetration of resonant magnetic perturbation have been investigated.

• OSTI ID: 22305886
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCURACY
CURRENT DENSITY
DISTURBANCES
ELECTRON DENSITY
EQUILIBRIUM
EQUILIBRIUM PLASMA
INTERFEROMETERS
LASERS
MAGNETIC CORES
MAGNETIC SURFACES
PHOTON BEAMS
PLASMA SCRAPE-OFF LAYER
POLARIMETERS
RESOLUTION
SAWTOOTH OSCILLATIONS
TOKAMAK DEVICES