Fast ion D-alpha measurements using a bandpass-filtered system on EAST
- Resource Type
- Authors
- Z. Xu; J. F. Chang; Wen Gao; M. von Hellermann; William Heidbrink; Junya Zhang; Junchao Huang; Y. B. Zhu; B. Madsen; B. N. Wan; C. R. Wu; Mirko Salewski
- Source
- Review of Scientific Instruments, 89, 10D121
Zhang, J, Huang, J, Chang, J F, Wu, C R, Heidbrink, W W, Salewski, M, Madsen, B, Zhu, Y B, von Hellermann, M G, Gao, W, Xu, Z & Wan, B 2018, ' Fast ion D-alpha measurements using a bandpass-filtered system on EAST ', Review of Scientific Instruments, vol. 89, no. 10, 10D121 . https://doi.org/10.1063/1.5038828
- Subject
- Physics
Photomultiplier
Tokamak
business.industry
Spectral bands
Optical Spectroscopy
01 natural sciences
010305 fluids & plasmas
Ion
law.invention
Optics
02 Physical Sciences, 03 Chemical Sciences, 09 Engineering
Band-pass filter
law
0103 physical sciences
Plasma diagnostics
010306 general physics
Spectroscopy
business
Instrumentation
Beam (structure)
Applied Physics
- Language
- ISSN
- 1089-7623
0034-6748
Based on the charge exchange reaction between fast ions and a neutral beam, fast ion features can be inferred from the spectrum of Doppler-shifted Balmer-alpha light from energetic hydrogenic atoms. In order to study the interaction between instabilities and fast-ion transport, recently we extended the fast ion D-alpha (FIDA) measurements by using a combination of a bandpass filter and a photomultiplier tube (PMT) (f-FIDA). A bandpass filter selects the desired spectral band from 651 nm to 654 nm before detection by the PMT. Preliminary data from the EAST tokamak show that the active signals have been detected from reneutralized beam ions along the vertical and tangential viewing geometries. The details will be presented in this paper to primarily address the specifications and performance of f-FIDA hardware components and preliminary FIDA measurements.