Validation of fast-ion D-alpha spectrum measurements during EAST neutral-beam heated plasmas

J Huang; W W Heidbrink; M G von Hellermann; L Stagner; C R Wu; Y M Hou; J F Chang; S Y Ding; Y J Chen; Y B Zhu; Z Jin; Z Xu; W Gao; J F Wang; B Lyu; Q Zang; G Q Zhong; L Hu; B Wan; EAST team

doi:10.1063/1.4960308

Validation of fast-ion D-alpha spectrum measurements during EAST neutral-beam heated plasmas

Rev Sci Instrum. 2016 Nov;87(11):11E542. doi: 10.1063/1.4960308.

Authors

J Huang¹, W W Heidbrink², M G von Hellermann³, L Stagner², C R Wu¹, Y M Hou¹, J F Chang¹, S Y Ding¹, Y J Chen¹, Y B Zhu², Z Jin¹, Z Xu¹, W Gao¹, J F Wang¹, B Lyu¹, Q Zang¹, G Q Zhong¹, L Hu¹, B Wan¹; EAST team¹

Affiliations

¹ Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, Anhui, China.
² University of California, Irvine, California 92697, USA.
³ Diagnostic Team, ITER Organization, Route de Vinon-sur-Verdon 13067 St. Paul Lez Durance, France.

PMID: 27910390
DOI: 10.1063/1.4960308

Abstract

To investigate the fast ion behavior, a fast ion D-alpha (FIDA) diagnostic system has been installed on EAST. Fast ion features can be inferred from the Doppler shifted spectrum of Balmer-alpha light from energetic hydrogenic atoms. This paper will focus on the validation of FIDA measurements performed using MHD-quiescent discharges in 2015 campaign. Two codes have been applied to calculate the D_α spectrum: one is a Monte Carlo code, Fortran 90 version FIDASIM, and the other is an analytical code, Simulation of Spectra (SOS). The predicted SOS fast-ion spectrum agrees well with the measurement; however, the level of fast-ion part from FIDASIM is lower. The discrepancy is possibly due to the difference between FIDASIM and SOS velocity distribution function. The details will be presented in the paper to primarily address comparisons of predicted and observed spectrum shapes/amplitudes.