First fast-ion D-alpha (FIDA) measurements and simulations on C-2U

N G Bolte; D Gupta; L Stagner; M Onofri; S Dettrick; E M Granstedt; P Petrov

doi:10.1063/1.4960540

First fast-ion D-alpha (FIDA) measurements and simulations on C-2U

Rev Sci Instrum. 2016 Nov;87(11):11E520. doi: 10.1063/1.4960540.

Authors

N G Bolte¹, D Gupta¹, L Stagner², M Onofri¹, S Dettrick¹, E M Granstedt¹, P Petrov¹

Affiliations

¹ Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688, USA.
² University of California, Irvine, Irvine, California 92697, USA.

PMID: 27910688
DOI: 10.1063/1.4960540

Abstract

The first measurements of fast-ion D-alpha (FIDA) radiation have been acquired on C-2U, Tri Alpha Energy's advanced, beam-driven field-reversed configuration (FRC). These measurements are also forward modeled by FIDASIM. This is the first measurement and simulation of FIDA carried out on an FRC topology. FIDA measurements are made of Doppler-shifted Balmer-alpha light from neutralized fast ions using a bandpass filter and photomultiplier tube. One adjustable line-of-sight measured signals at eight locations and eight times during the FRC lifetime over 26 discharges. Filtered signals include only the highest energy ions (>6 keV) and share some salient features with the FIDASIM result. Highly Doppler-shifted beam radiation is also measured with a high-speed camera and is spatially well-correlated with FIDASIM.