Modification of neutron emission spectra and determination of fuel ion ratio in beam-injected deuterium-tritium plasma

Yasuko Kawamoto, Hideaki Matsuura

Research output: Contribution to journalArticle

Abstract

To stably control and operate a deuterium-tritium (DT) fusion reactor, it is important to accurately obtain the fuel ion ratio nt/nd (n is the number density). Previously, fuel ion ratio diagnostic methods using deuteriumdeuterium (DD) and DT neutron emission rates have been studied. The reaction rate coefficients and neutron emission spectra, i.e., the shape and peak value, are strongly influenced by external plasma heating such as neutron beam injection (NBI) heating. In this paper, we consider the fuel ion ratio diagnostics by directly measuring the neutron emission spectra, including both beam-thermal and beam-beam fusion reactions, in deuterium beaminjected DT plasma. We also evaluate the slowing-down neutron component, i.e., noise, to examine whether the above method can be used for plasma diagnostics. On the basis of Boltzmann-Fokker-Planck and Monte Carlo neutron transport analyses, the applicability of the method to the beam-injected DT plasma is discussed. It is shown that the feasible plasma parameter regions of measuring for fuel ion ratio diagnostics is increased by beam injection and by adopting neutron detector channels shifted to the high-energy side.

Original languageEnglish
Article number2405078
JournalPlasma and Fusion Research
Volume11
Issue number1
DOIs
Publication statusPublished - Jan 1 2016

Fingerprint

neutron emission
neutron spectra
tritium
deuterium
emission spectra
beam injection
ions
neutrons
plasma heating
neutron counters
fusion reactors
plasma diagnostics
neutron beams
reaction kinetics
fusion
heating
coefficients

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Modification of neutron emission spectra and determination of fuel ion ratio in beam-injected deuterium-tritium plasma. / Kawamoto, Yasuko; Matsuura, Hideaki.

In: Plasma and Fusion Research, Vol. 11, No. 1, 2405078, 01.01.2016.

Research output: Contribution to journalArticle

@article{3b7f3ceb0da34d3fa070eb65358c3632,
title = "Modification of neutron emission spectra and determination of fuel ion ratio in beam-injected deuterium-tritium plasma",
abstract = "To stably control and operate a deuterium-tritium (DT) fusion reactor, it is important to accurately obtain the fuel ion ratio nt/nd (n is the number density). Previously, fuel ion ratio diagnostic methods using deuteriumdeuterium (DD) and DT neutron emission rates have been studied. The reaction rate coefficients and neutron emission spectra, i.e., the shape and peak value, are strongly influenced by external plasma heating such as neutron beam injection (NBI) heating. In this paper, we consider the fuel ion ratio diagnostics by directly measuring the neutron emission spectra, including both beam-thermal and beam-beam fusion reactions, in deuterium beaminjected DT plasma. We also evaluate the slowing-down neutron component, i.e., noise, to examine whether the above method can be used for plasma diagnostics. On the basis of Boltzmann-Fokker-Planck and Monte Carlo neutron transport analyses, the applicability of the method to the beam-injected DT plasma is discussed. It is shown that the feasible plasma parameter regions of measuring for fuel ion ratio diagnostics is increased by beam injection and by adopting neutron detector channels shifted to the high-energy side.",
author = "Yasuko Kawamoto and Hideaki Matsuura",
year = "2016",
month = "1",
day = "1",
doi = "10.1585/pfr.11.2405078",
language = "English",
volume = "11",
journal = "Plasma and Fusion Research",
issn = "1880-6821",
publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",
number = "1",

}

TY - JOUR

T1 - Modification of neutron emission spectra and determination of fuel ion ratio in beam-injected deuterium-tritium plasma

AU - Kawamoto, Yasuko

AU - Matsuura, Hideaki

PY - 2016/1/1

Y1 - 2016/1/1

N2 - To stably control and operate a deuterium-tritium (DT) fusion reactor, it is important to accurately obtain the fuel ion ratio nt/nd (n is the number density). Previously, fuel ion ratio diagnostic methods using deuteriumdeuterium (DD) and DT neutron emission rates have been studied. The reaction rate coefficients and neutron emission spectra, i.e., the shape and peak value, are strongly influenced by external plasma heating such as neutron beam injection (NBI) heating. In this paper, we consider the fuel ion ratio diagnostics by directly measuring the neutron emission spectra, including both beam-thermal and beam-beam fusion reactions, in deuterium beaminjected DT plasma. We also evaluate the slowing-down neutron component, i.e., noise, to examine whether the above method can be used for plasma diagnostics. On the basis of Boltzmann-Fokker-Planck and Monte Carlo neutron transport analyses, the applicability of the method to the beam-injected DT plasma is discussed. It is shown that the feasible plasma parameter regions of measuring for fuel ion ratio diagnostics is increased by beam injection and by adopting neutron detector channels shifted to the high-energy side.

AB - To stably control and operate a deuterium-tritium (DT) fusion reactor, it is important to accurately obtain the fuel ion ratio nt/nd (n is the number density). Previously, fuel ion ratio diagnostic methods using deuteriumdeuterium (DD) and DT neutron emission rates have been studied. The reaction rate coefficients and neutron emission spectra, i.e., the shape and peak value, are strongly influenced by external plasma heating such as neutron beam injection (NBI) heating. In this paper, we consider the fuel ion ratio diagnostics by directly measuring the neutron emission spectra, including both beam-thermal and beam-beam fusion reactions, in deuterium beaminjected DT plasma. We also evaluate the slowing-down neutron component, i.e., noise, to examine whether the above method can be used for plasma diagnostics. On the basis of Boltzmann-Fokker-Planck and Monte Carlo neutron transport analyses, the applicability of the method to the beam-injected DT plasma is discussed. It is shown that the feasible plasma parameter regions of measuring for fuel ion ratio diagnostics is increased by beam injection and by adopting neutron detector channels shifted to the high-energy side.

UR - http://www.scopus.com/inward/record.url?scp=85009786178&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85009786178&partnerID=8YFLogxK

U2 - 10.1585/pfr.11.2405078

DO - 10.1585/pfr.11.2405078

M3 - Article

VL - 11

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

SN - 1880-6821

IS - 1

M1 - 2405078

ER -