Neutron Activation System for ITER Tokamak

Krasilnikov, V.; Cheon, MunSeong; Bertalot, L.

doi:10.5772/intechopen.75966

Cited by 2 publications

(2 citation statements)

References 7 publications

(7 reference statements)

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“…Similar studies, employing a wide variety of neutron diagnostics and activation samples, will be carried out during JET's DT campaign to validate neutron emission modelling in DT plasmas as well. ITER is envisioned to commission a set of neutron diagnostics similar to that of JET [76], including a neutron activation system [77]. Its is also planned to employ an in-vessel absolute neutron yield calibration procedure [78].…”

Section: Discussionmentioning

confidence: 99%

Experimental validation of an integrated modelling approach to neutron emission studies at JET

et al. 2021

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An integrated modelling methodology for the calculation of realistic plasma neutron sources for the JET tokamak has been developed. The computational chain comprises TRANSP plasma transport and DRESS neutron spectrum calculations, and their coupling to the MCNP neutron transport code, bridging plasma physics and neutronics. In the paper we apply the developed methodology to the analysis of neutron emission properties of deuterium and helium plasmas at JET, and validate individual modelling steps against neutron diagnostic measurements. Two types of JET discharges are modelled—baseline-like and three-ion radio-frequency scenarios—due to their diversity in plasma heating, characteristics of the induced fast ion population, and the imprint of these on neutron emission properties. The neutron emission modelling results are quantitatively compared to the total neutron yield from fission chambers, neutron emissivity profiles from the neutron camera, neutron spectra from the time-of-flight spectrometer, and neutron activation measurements. The agreement between measured and calculated quantities is found to be satisfactory for all four diagnostic systems within the estimated experimental and computational uncertainties. Additionally, the effect of neutrons not originating from the dominating D(D, n)3He reactions is studied through modelling of triton burnup DT neutrons, and, in mixed D-3He plasmas, neutrons produced in the 9Be(D, nγ)10B reaction on impurities. It is found that these reactions can contribute up to several percent to the total neutron yield and dominate the neutron activation of samples. The effect of MeV-range fast ions on the neutron activation of 115In and 27Al samples is measured and computationally validated.

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Section: Discussionmentioning

confidence: 99%

Experimental validation of an integrated modelling approach to neutron emission studies at JET

et al. 2021

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“…Neutron activation systems based on foils are used at most high performance fusion devices such as JET [7], KSTAR [8] and JT-60U [9]. ITER has planned a NAS with a total of 12 different irradiation positions [10]. NASs can provide an absolutely calibrated measurement of the local neutron fluence, provided the neutron energy spectrum at the irradiation location is known, from which P f can be estimated.…”

Section: Neutron Activation Systemmentioning

confidence: 99%

Pre-conceptual study of the European DEMO neutron diagnostics

et al. 2019

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A: This paper discusses the pre-conceptual design of the European DEMO neutron diagnostics aimed at the measurement of the fusion power, the plasma displacement and the fuel ion ratio for plasma burn control. The design has been based on the European DEMO design concept with a single divertor and on the so-called DEMO1 plasma scenario but limited only to the steady phased of the discharge. The suggested neutron diagnostics consist of neutron activation systems, fission chambers and vertical and horizontal collimated neutron flux monitors with spectroscopy capabilities. The fusion power can be measured with an accuracy of 1 % with a time resolution of one tenth of the energy confinement time and the plasma displacement with a time resolution of 1 ms. Central ion temperature and fuel ion ratio instead can be measured with a time resolution of about 1 s. Calibration and interfacing issues are discussed. K: Neutron detectors, Fast neutrons, Nuclear instruments and methods for hot plasma diagnostics.

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Neutron Activation System for ITER Tokamak

Cited by 2 publications

References 7 publications

Experimental validation of an integrated modelling approach to neutron emission studies at JET

Experimental validation of an integrated modelling approach to neutron emission studies at JET

Pre-conceptual study of the European DEMO neutron diagnostics

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