Neutron spectrometry of radio-frequency heated deuterium–tritium plasmas

Tardocchi, M.; Ballabio, L.; Conroy, S.; Ericsson, Göran; Frenje, J. A.; Gorini, G.; Guadagno, Claudia Nunzia; Källne, J.; Prandoni, P.; Traneus, E.

doi:10.1063/1.1149495

Cited by 9 publications

(4 citation statements)

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“…Some early results can be found in e.g. Refs [10,49,52,53]. This technique employs a magnetic spectrometer to separate the selected forward-scattered protons according to their momentum (energy), as given by the cyclotron equation: Bq = p/q, where B is the applied magnetic field, q is the bending radius, p is the particle momentum and q is the charge of the particle.…”

Section: Thin Foil Proton Recoil Systemsmentioning

confidence: 99%

Advanced Neutron Spectroscopy in Fusion Research

Ericsson

2019

J Fusion Energ

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This paper presents a review of the current state-of-the-art neutron spectroscopy in fusion research. The focus is on the fundamental nuclear physics and measurement principles. A brief introduction to relevant nuclear physics concepts is given and also a summary of the basic properties of neutron emission from a fusion plasma. Compact monitors/spectrometers like diamond, CLYC and the liquid scintillator are discussed. A longer section describes in some detail the more advanced, designed systems like those based on the thin-foil proton recoil and time-of-flight techniques. Examples of spectroscopy systems installed at JET and planned for ITER are given.

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Section: Thin Foil Proton Recoil Systemsmentioning

confidence: 99%

Advanced Neutron Spectroscopy in Fusion Research

Ericsson

2019

J Fusion Energ

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“…Therefore, this discharge was also studied through NES, resulting in a detailed study of the plasma response to RF heating [6]. Additional information on theoretical RF heating studies of discharges #42753 and #41679 can be found in [7]; discharge #42753 was also subject to a preliminary NES study [8].…”

Section: Introductionmentioning

confidence: 99%

Synergetic RF and NB heating effects in JET DT plasmas studied with neutron emission spectroscopy

Henriksson¹,

Conroy²,

Ericsson³

et al. 2006

Nucl. Fusion

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The MPR neutron emission spectroscopy diagnostic has been used to study plasmas produced at JET during the main deuterium-tritium experimental campaign (DTE1). The plasmas were subjected to Radio Frequency (RF) and Neutral Beam (NB) heating in different combinations during periods of individual discharges. Similar discharges with different heating combinations were also compared. This paper deals, in particular, with the synergetic coupling of the ion cyclotron resonance frequency of the RF power to the fast ions from the NB injection. The key observable in this study is the high-energy tail that can be detected in the neutron spectrum as evidence of the RF acceleration of fuel ions. The synergy effect was observed both in deuterium and tritium heated discharges, with RF coupled to the second harmonic resonance of the heating species. It was seen that the NB power is enhanced and that the effect demonstrated a correlation with the total injected RF and NB power.This coupling effect was quantified in terms of the measured spectral amplitude and the derived temperature of the supra-thermal high-energy tail of the fuel ion populations. Bulk heating effects were also studied in discharges with favourable conditions for NES measurements.

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“…This study concerns eight JET (D)T pulses (nos 42766, 42768, 42769, 42772, 42791, 42792, 42988, 42989) some of which have been discussed earlier on the basis of a preliminary analysis [5].…”

Section: Methodsmentioning

confidence: 99%

Neutron emission spectroscopy of radio frequency heated (D)T plasmas

et al. 2002

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The energy spectrum of the d+t→α+n neutron emission has been measured in experiments carried out at JET for plasmas of deuterium–tritium subjected to minority ion cyclotron resonance heating (ICRH) tuned to deuterium. The data obtained with the magnetic proton recoil spectrometer were of sufficient quality to distinguish up to three spectral components of neutron emission some of which were time resolved. A new analysis model was used to derive information on the underlying deuteron velocity distributions and their corresponding energy densities in the plasma. This experiment represents the first use of neutron emission spectroscopy for detailed diagnosis of the response of fusion plasmas to the applied ICRH power for different plasma conditions, including the time evolution over the heating pulse duration for individual discharges. In particular, ICRH effects on the plasma, together with the power absorption mechanisms, were studied as a function of the minority ion concentration in the range 9–20%.

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Neutron spectrometry of radio-frequency heated deuterium–tritium plasmas

Cited by 9 publications

References 1 publication

Advanced Neutron Spectroscopy in Fusion Research

Advanced Neutron Spectroscopy in Fusion Research

Synergetic RF and NB heating effects in JET DT plasmas studied with neutron emission spectroscopy

Neutron emission spectroscopy of radio frequency heated (D)T plasmas

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