Calibration of the JET neutron yield monitors using the delayed neutron counting technique

Belle, P. van; Jarvis, O.N.; Sadler, G.; Leeuw, S. De; D’hondt, P.; Pillon, M.

doi:10.1063/1.1141679

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…The activation method using delayed neutrons has been successfully applied in large fusion devices [11,13,[17][18][19]. This variant of the activation method is implemented on JET together with the standard activation method based on gamma-spectrometry.…”

Section: Activation Methods Of Neutron Measurements Based On Delayed Nmentioning

confidence: 99%

“…The six 3 He proportional counters (one-inch diameter, 15 cm sensitive length) surround the hole (at a radial distance of 8 cm), forming a hexagonal array. [19].…”

Section: Activation Methods Of Neutron Measurements Based On Delayed Nmentioning

confidence: 99%

“…Unlike the indium used in gamma-spectrometry based activation method, the fissionable samples can be irradiated in each plasma discharge, one after another, due to short half-lives of delayed neutron precursors. In the system at JET [19], the sample of fission material is positioned in the irradiation end before the discharge and removed few seconds after the discharge is terminated. The rabbit system transfers the activates sample to the measurement set-up in 15 s. The counting of the detectors starts together with discharge start and sampled at 500 ms intervals, after sample arrival the neutron signal is registered.…”

Section: Activation Methods Of Neutron Measurements Based On Delayed Nmentioning

confidence: 99%

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Review of Neutron Diagnostics Based on Fission Reactions Induced by Fusion Neutrons

Woźnicka

2018

J Fusion Energ

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Neutrons are an exceptional diagnostic signature in magnetic fusion experiments with high temperature plasma. A part of neutron detection methods relies on detecting nuclear reactions products, initiated by neutrons. Among different possibilities, the neutron-induced fission reactions can be used. These methods use the specific properties of the radioactive decay phenomena induced by neutrons of heavy elements like uranium or thorium. The neutron-induced fission reactions produce energetic fission fragments that can be detected in a special type of ionization chambers that has one of electrode covered with fissionable material. A fission reaction may be also adapted to neutron detection by activation method. A dedicated target-sample made from fissionable isotope (like 235 U, 238 U, 232 Th), irradiated by neutrons, is the source of prompt and delayed neutrons. The decay curve of delayed neutrons can be registered almost immediately after irradiation by fusion neutrons, with a delay resulting exclusively from the time of transport of the samples to the measuring set-up. The yield of a fusion neutron source can be calculated from that measurement. Fission phenomena and fissionable materials are applicable in plasma neutron diagnostics. The lecture gives the introduction to the nuclear fission process and the particular attention is done to the phenomenon and physics of delayed neutrons which are generated during the fission reaction. Examples of delayed neutrons activation set-up and fission chambers dedicated for tokamaks are presented.

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Section: Activation Methods Of Neutron Measurements Based On Delayed Nmentioning

confidence: 99%

“…The six 3 He proportional counters (one-inch diameter, 15 cm sensitive length) surround the hole (at a radial distance of 8 cm), forming a hexagonal array. [19].…”

Section: Activation Methods Of Neutron Measurements Based On Delayed Nmentioning

confidence: 99%

Section: Activation Methods Of Neutron Measurements Based On Delayed Nmentioning

confidence: 99%

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Review of Neutron Diagnostics Based on Fission Reactions Induced by Fusion Neutrons

Woźnicka

2018

J Fusion Energ

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“…In the fusion experiments using deuterium-deuterium (D-D) and/or deuterium-tritium plasma (D-T), the precise measurement of the emitted neutrons is very important for both the physics research and the radiation safety [1][2][3][4][5]. Neutron interaction with materials is significantly dependent upon the neutron energy [6] and proper neutron detectors must be selected depending upon the neutron energy range to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Thermal neutron measurement by single crystal CVD diamond detector applied with the pulse shape discrimination during deuterium plasma experiment in LHD

Kobayashi

Angelone

Yoshihashi

et al. 2020

Fusion Engineering and Design

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“…In the fusion experimental devices using deuterium and/or tritium plasma, high density and high temperature plasma produces a high neutron flux [1][2][3]. Therefore, the detector measureable for the fast neutron in the radiation background environment is desired for the diagnostics of fusion plasma.…”

Section: Introductionmentioning

confidence: 99%

Thermal neutron flux evaluation by a single crystal CVD diamond detector in LHD deuterium experiment

et al. 2019

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A single crystal CVD diamond detector (SDD) was installed in the torus hall of the Large Helical Device (LHD) to measure neutron during deuterium plasma operation. The LiF foil with 95.62 % of 6 Li isotope enrichment pasted on the detector was used as the thermal neutron convertor. The energetic ions of 2.0 MeV alpha and 2.7 MeV triton particles generated by the nuclear reaction of neutron with 6 Li in LiF foil. Then, energetic ions deposited the energy into diamond, producing a signals in SDD.SDD were exposed to the neutron field in the torus hall of the LHD during the 2nd campaign of the deuterium experiment. The total charge in SDD during one plasma shot in LHD was linearly propotional to the neutron yield over 4 orders of magnitude. The energetic alpha and triton were separately measured by SDD with LiF with the thickness of 1.9 μm, although SDD with LiF with the thickness of 350 μm showed a broadened peak due to the large energy loss of energetic particles generated in the bulk of LiF. The modeling with MCNP and PHITS codes well interpreted the pulse height spectra for SDD with LiF with different thicknesses.

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Calibration of the JET neutron yield monitors using the delayed neutron counting technique

Abstract: Neutron yield measurements by use of activation techniques on TEXTOR-94Rev.

Cited by 7 publications

References 1 publication

Review of Neutron Diagnostics Based on Fission Reactions Induced by Fusion Neutrons

Review of Neutron Diagnostics Based on Fission Reactions Induced by Fusion Neutrons

Thermal neutron measurement by single crystal CVD diamond detector applied with the pulse shape discrimination during deuterium plasma experiment in LHD

Thermal neutron flux evaluation by a single crystal CVD diamond detector in LHD deuterium experiment

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