Improved spatial calibration for the CXRS system on EAST

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4962054· OSTI ID:22596407

Yin, X. H.; Feng, S. Y. ^[1]; Fu, J.; Gu, Y. Q.; Cheng, Y.; Wan, B. N. ^[2]; Jiang, D. ^[2]; Lyu, B. ^[2]; Shi, Y. J. ^[1]; Ye, M. Y. ^[1]

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1. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026 (China)
2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)

A Charge eXchange Recombination Spectroscopy (CXRS) diagnostic system has been developed to measure profiles of ion temperature and rotation since 2014 on EAST. Several techniques have been developed to improve the spatial calibration of the CXRS diagnostic. The sightline location was obtained by measuring the coordinates of three points on each sightline using an articulated flexible coordinate measuring arm when the vessel was accessible. After vacuum pumping, the effect of pressure change in the vacuum vessel was evaluated by observing the movement of the light spot from back-illuminated sightlines on the first wall using the newly developed articulated inspection arm. In addition, the rotation of the periscope after vacuum pumping was derived by using the Doppler shift of neutral beam emission spectra without magnetic field. Combining these techniques, improved spatial calibration was implemented to provide a complete and accurate description of the EAST CXRS system. Due to the effects of the change of air pressure, a ∼0.4° periscope rotation, yielding a ∼20 mm movement of the major radius of observation positions to the lower field side, was derived. Results of Zeeman splitting of neutral beam emission spectra with magnetic field also showed good agreement with the calibration results.

• OSTI ID: 22596407
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); 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
AIR
BEAMS
CALIBRATION
CHARGE EXCHANGE
CONTAINERS
DIAGNOSTIC TECHNIQUES
DOPPLER EFFECT
EMISSION SPECTRA
FIRST WALL
INSPECTION
ION TEMPERATURE
MAGNETIC FIELDS
PERISCOPES
PUMPING
RECOMBINATION
ROTATION
ZEEMAN EFFECT