14 MeV calibration of JET neutron detectors-phase 1: Calibration and characterization of the neutron source
Artikel i vetenskaplig tidskrift, 2018

In view of the planned DT operations at JET, a calibration of the JET neutron monitors at 14 MeV neutron energy is needed using a 14 MeV neutron generator deployed inside the vacuum vessel by the JET remote handling system. The target accuracy of this calibration is 10% as also required by ITER, where a precise neutron yield measurement is important, e.g. for tritium accountancy. To achieve this accuracy, the 14 MeV neutron generator selected as the calibration source has been fully characterised and calibrated prior to the in-vessel calibration of the JET monitors. This paper describes the measurements performed using different types of neutron detectors, spectrometers, calibrated long counters and activation foils which allowed us to obtain the neutron emission rate and the anisotropy of the neutron generator, i.e.The neutron flux and energy spectrum dependence on emission angle, and to derive the absolute emission rate in 4π sr. The use of high resolution diamond spectrometers made it possible to resolve the complex features of the neutron energy spectra resulting from the mixed D/T beam ions reacting with the D/T nuclei present in the neutron generator target. As the neutron generator is not a stable neutron source, several monitoring detectors were attached to it by means of an ad hoc mechanical structure to continuously monitor the neutron emission rate during the in-vessel calibration. These monitoring detectors, two diamond diodes and activation foils, have been calibrated in terms of neutrons/counts within ± 5% total uncertainty. A neutron source routine has been developed, able to produce the neutron spectra resulting from all possible reactions occurring with the D/T ions in the beam impinging on the Ti D/T target. The neutron energy spectra calculated by combining the source routine with a MCNP model of the neutron generator have been validated by the measurements. These numerical tools will be key in analysing the results from the in-vessel calibration and to derive the response of the JET neutron detectors to DT plasma neutrons starting from the response to the generator neutrons, and taking into account all the calibration circumstances.

Neutron generator

Fusion reactor

Neutron calibration

Författare

X. Litaudon

Culham Lab

S. Abduallev

Forschungszentrum Jülich

M. Abhangi

Institute for Plasma Research India

P. Abreu

Instituto Superior Tecnico

M. Afzal

Culham Lab

K.M. Aggarwal

Queen's University Belfast

T. Ahlgren

Helsingin Yliopisto

J. H. Ahn

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

L. Aho-Mantila

Teknologian Tutkimuskeskus (VTT)

N. Aiba

National Institutes for Quantum and Radiological Science and Technology

M. Airila

Teknologian Tutkimuskeskus (VTT)

R. Albanese

Universita degli Studi di Napoli Federico II

V. Aldred

Culham Lab

D. Alegre

Universidad Nacional de Educacion a Distancia

E. Alessi

Istituto Di Fisica Del Plasma Piero Caldirola, Milan

P B Aleynikov

ITER

A. Alfier

Consorzio Rfx

A. Alkseev

National Research Centre "Kurchatov Institute"

M. Allinson

Culham Lab

B Alper

Culham Lab

E. Alves

Instituto Superior Tecnico

G. Ambrosino

Universita degli Studi di Napoli Federico II

R. Ambrosino

Universita degli Studi di Napoli Parthenope

L. Amicucci

ENEA Centro Ricerche Frascati

V. Amosov

Troitsk Institute for Innovation and Fusion Research

E. Andersson Sundén

Uppsala universitet

M. Angelone

ENEA Centro Ricerche Frascati

M. Anghel

National Research and Development Institute for Cryogenics and Isotopic Technologies

C. Angioni

Max Planck-institutet

L. Appel

Culham Lab

C. Appelbee

Culham Lab

P. Arena

Universita degli Studi di Catania

M. Ariola

Universita degli Studi di Napoli Parthenope

D. Alegre

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

S. Arshad

Fusion for Energy Joint Undertaking

A. Ash

Culham Lab

N. Ashikawa

National Institutes of Natural Sciences - National Institute for Fusion Science

V. Aslanyan

Massachusetts Institute of Technology (MIT)

O. Asunta

Aalto-Yliopisto

F. Auriemma

Consorzio Rfx

Y. Austin

Culham Lab

L. Avotina

Latvijas Universitate

M.D. Axton

Culham Lab

C. Ayres

Culham Lab

M. Bacharis

Imperial College London

A. Baciero

Laboratorio Nacional de Fusion

D. Baião

Instituto Superior Tecnico

S. Bailey

Culham Lab

A. Baker

Culham Lab

I. Balboa

Culham Lab

M. Balden

Max Planck-institutet

N. Balshaw

Culham Lab

R. Bament

Culham Lab

J.W. Banks

Culham Lab

Y.F. Baranov

Culham Lab

M.A. Barnard

Culham Lab

D. Barnes

Culham Lab

M. Barnes

University of Oxford

R. Barnsley

ITER

A. Baron Wiechec

Culham Lab

L.B. Orte

EUROfusion Programme Management Unit

M. Baruzzo

Consorzio Rfx

V. Basiuk

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

M. Bassan

ITER

R. Bastow

Culham Lab

A. Batista

Instituto Superior Tecnico

P. Batistoni

ENEA Centro Ricerche Frascati

R. Baughan

Culham Lab

B. Bauvir

ITER

L. Baylor

Oak Ridge National Laboratory

B. Bazylev

Karlsruher Institut für Technologie (KIT)

J. Beal

University of York

P.S. Beaumont

Culham Lab

M. Beckers

Forschungszentrum Jülich

B. Beckett

Culham Lab

A. Becoulet

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

N. Bekris

Culham Lab

M. Beldishevski

Culham Lab

K. Bell

Culham Lab

F. Belli

ENEA Centro Ricerche Frascati

M. Bellinger

Culham Lab

Belonohy

Max Planck-institutet

N. Ben Ayed

Culham Lab

N.A. Benterman

Culham Lab

H. Bergsåker

Kungliga Tekniska Högskolan (KTH)

J. Bernardo

Instituto Superior Tecnico

M. Bernert

Max Planck-institutet

M. Berry

Culham Lab

L. Bertalot

ITER

C. Besliu

Culham Lab

M. N. A. Beurskens

Max Planck-institutet

B. Bieg

Akademia Morska w Szczecinie

J. Bielecki

Polish Academy of Sciences

T. Biewer

Oak Ridge National Laboratory

M. Bigi

Consorzio Rfx

P. Bílková

Czech Academy of Sciences

F. Binda

Uppsala universitet

A. Bisoffi

Universita degli Studi di Trento

J. P. S. Bizarro

Instituto Superior Tecnico

C. Björkas

Helsingin Yliopisto

Dimitriy Yadykin

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Plasmafysik och fusionsenergi

Nuclear Fusion

0029-5515 (ISSN)

Vol. 58 2 026012

Ämneskategorier

Acceleratorfysik och instrumentering

Subatomär fysik

Fusion, plasma och rymdfysik

DOI

10.1088/1741-4326/aa98f6

Mer information

Senast uppdaterat

2019-01-07