Diagnosis of fast ions produced by negative-ion neutral-beam injection with fast-ion deuterium-alpha spectroscopy

Muscatello, C. M.; Heidbrink, W. W.; Boivin, R. L.; Chrystal, C.; Collins, C. S.; Fujiwara, Y.; Yamaguchi, H.

doi:10.1063/1.5099491

Title: Diagnosis of fast ions produced by negative-ion neutral-beam injection with fast-ion deuterium-alpha spectroscopy

Journal Article · Tue Jul 23 00:00:00 EDT 2019 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5099491· OSTI ID:1568811

^[1]; Heidbrink, W. W. ^[2]; Boivin, R. L. ^[1];

^[1]; Collins, C. S. ^[1]; Fujiwara, Y. ^[3]; Yamaguchi, H. ^[3]

General Atomics, San Diego, CA (United States)
Univ. of California-Irvine, Irvine, CA (United States). Dept. of Physics and Astronomy
National Inst. for Fusion Science, Toki, Gifu (Japan)

Negative neutral-beam injection (NNBI) is an important source of heating and current drive for next-step devices like JT-60SA and ITER where the injected energy can range from hundreds of keV to 1 MeV. Few diagnostics are suitable for phase-space resolved measurements of fast ions with energy in excess of 100 keV. A feasibility study of using fast-ion deuterium-alpha (FIDA) spectroscopy to diagnose the high-energy ions produced by NNBI in a fusion plasma is presented. Two case studies with the Large Helical Device (LHD) and JT-60SA illustrate possible solutions for the measurement. The steady-state slowing-down distribution function of fast ions produced by NNBI is calculated for both devices, and the FIDA spectrum is predicted by synthetic diagnostic simulation. Results with 180-keV NNBI in LHD show that, with a judicious choice of viewing geometry, the FIDA intensity is comparable to that obtained with the existing FIDA system. The typical time resolution of ~10 ms achieved with existing FIDA systems can be obtained with NNBI FIDA on LHD. The measurement is more challenging with the 500-keV NNBI in JT-60SA. In this case, simulations predict the FIDA intensity to be about 1% of the background bremsstrahlung, which is small compared to existing FIDA implementations with positive neutral-beam injection where signal levels are an order of magnitude larger. The sampling time required to extract the small FIDA signal is determined using a probabilistic approach. Results indicate that long averaging periods, from ones to tens of seconds, depending on the FIDA and background variance, are needed to resolve the FIDA signal in JT-60SA. These long averaging times are suitable in long-pulse (~ 100s), steady-state devices like JT-60SA where an important measurement objective is the spatial profile of the slowing-down distribution of fast ions.

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Research Organization:: General Atomics, San Diego, CA (United States); Univ. of California, Irvine, CA (United States); National Inst. for Fusion Science (NIFS) (Japan)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; SC0018107

OSTI ID:: 1568811

Alternate ID(s):: OSTI ID: 1544449; OSTI ID: 1595475

Journal Information:: Review of Scientific Instruments, Vol. 90, Issue 7; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Title: Diagnosis of fast ions produced by negative-ion neutral-beam injection with fast-ion deuterium-alpha spectroscopy

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