Method for determining the shape and size of a knock-on tail using the Doppler-broadened γ-ray emission spectrum

Kawamoto, Yasuko; Matsuura, Hideaki

doi:10.1016/j.fusengdes.2019.04.062

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…It has been noted that FIDA becomes more challenging to measure as the fast deuteron's energy author's e-mail: k_kimura@nucl.kyushu-u.ac.jp increases [4]. Diagnostic methods using neutron/γ-ray energy spectra are efficient for such fast deuterons [5,6]. However, radiation spectrometers have a lower energy resolution than visible light spectrometers.…”

Section: Introductionmentioning

confidence: 99%

Study on Fast Deuteron Diagnostics Method Using Fast <sup>3</sup>He Visible Spectra in the Large Helical Device Deuterium Plasma

Kimura

Matsuura

Itoh

et al. 2023

Plasma and Fusion Research

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Fast ion diagnostic is one of the most crucial plasma diagnostics for nuclear fusion investigation. A new diagnostic method for fast ions has been proposed using visible spectra of 3 He produced by a deuteron-deuteron reaction. This diagnostic method has a better energy resolution than methods using neutron/γ-ray and is superior to conventional spectroscopy in measuring high energy (MeV order) ions. This diagnostic method has been predicted using numerical analysis for ITER, but no verification experiments have been performed yet. In this study, we examined the measurability of this diagnostic method in the large helical device (LHD) deuterium plasma. Although very dependent on the measurement geometry and the spectrometer performance, it may be possible to measure the fast 3 He visible spectrum. c

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Section: Introductionmentioning

confidence: 99%

Study on Fast Deuteron Diagnostics Method Using Fast <sup>3</sup>He Visible Spectra in the Large Helical Device Deuterium Plasma

Kimura

Matsuura

Itoh

et al. 2023

Plasma and Fusion Research

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“…The installation of gamma ray systems was planned [39] to understand the MeV ion confinement created by the ion cyclotron range of frequency wave heating experiments [40]. Additionally, gamma ray diagnostics played an important role in knock-on tail observation [41][42][43] through the 6 Li(d, p ′ 𝛾) 8 Be reaction [44,45] and a study toward aneutronic p-11 B fusion [46]. In the commissioning of gamma ray diagnostics based on a large volume LaBr 3 :Ce detector conducted in LHD [47], the gamma ray signal suffered from prompt gamma rays induced by neutrons.…”

Section: Introductionmentioning

confidence: 99%

Gamma ray diagnostics for high time resolution measurement in large helical device

Ogawa,

Sangaroon,

Liao

et al. 2023

J. Inst.

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A 1-inch LaBr3:Ce gamma ray scintillation detector, characterized by high time and energy resolution, was installed to advance energetic particle physics studies in Large Helical Device (LHD). We reduced the size of the scintillator from 3 inches to 1 inch to reinforce the radiation shielding to reduce the unwanted signal in the detector induced by fast neutrons and stray gamma rays according to the commissioning results. The radiation shielding composed of 10% borated polyethylene and lead was redesigned to suppress the gamma-ray induced signal based on the Monte Carlo three-dimensional neutron and gamma-ray transport code MCNP6. We increased the lead thickness from 50 mm to 77.5 mm to suppress the stray gamma ray effect. The gamma ray spectrum was measured in the hydrogen neutral beam heated deuterium plasma with 6LiF pellet injection. We might obtain a gamma ray peak near 0.48 MeV due to the 6Li(d,p'γ)7Li reaction.

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“…These methods are useful as a measurement method for small tails [22,23]. However, compared to spectroscopic measurements such as FIDA, its energy resolution is low due to the use of radiation measuring instruments.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a fast deuterium diagnostic method based on visible energetic 3He spectroscopy for high electron density plasmas

Kimura

Matsuura

Kawamoto

et al. 2023

Review of Scientific Instruments

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Fast ions play a crucial role in plasma heating, and their behavior in the plasma must be accurately understood. A diagnostics method based on charge exchange emission from the n = 4 − 3 transition (λ0 = 468.6 nm) of energetic 3He produced by the deuteron–deuteron reaction has been proposed as a for fast deuterons with energies in the order of MeV. The proposed method has the following advantages: No beam emission interferes with the spectra, the direction of the measuring line of sight, and the injection angle of the diagnostic beam can be freely determined. In previous studies, due to competing bremsstrahlung, it was expected that the proposed method will not be practical in the case of high electron density operation. This paper makes the proposed method available for measurement even at high electron densities by optimizing the measurement line of sight direction and the diagnostic beam incidence angle. This allows an electron density five times larger than the range of applications shown in previous studies. This result will contribute to measure of DT alpha in ITER.

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Method for determining the shape and size of a knock-on tail using the Doppler-broadened γ-ray emission spectrum

Cited by 6 publications

References 14 publications

Study on Fast Deuteron Diagnostics Method Using Fast <sup>3</sup>He Visible Spectra in the Large Helical Device Deuterium Plasma

Study on Fast Deuteron Diagnostics Method Using Fast <sup>3</sup>He Visible Spectra in the Large Helical Device Deuterium Plasma

Gamma ray diagnostics for high time resolution measurement in large helical device

Optimization of a fast deuterium diagnostic method based on visible energetic 3He spectroscopy for high electron density plasmas

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