Speaker
Sorin Soare
(ICIT Rm. Valcea)
Description
A new diagnostics technique, the Lost Alpha Monitor (LAM), for the investigation of escaping alpha particles in JET has been proposed [1]. The method is based on the detection of the gamma radiation induced by the escaping particles on a target external to the plasma. For a beryllium target this reaction is 99Be(a, nγ)1212C. The implementation on JET of the LAM technique would make possible correlated measurements of lost and confined alphas using the same nuclear reaction.
The paper presents the conceptual design of the LAM diagnostics for JET.
The main components of the proposed LAM diagnostics include a radiation collimator and shield which houses two gamma-ray detectors located behind lithium hydride neutron attenuators. The radiation shield is made up of a core stainless-steel collimator surrounded by the neutron and gamma-ray shield constructed from thick plates of high density polyethylene and lead. The collimator-shield assembly is placed behind the existing KJ5 soft X-ray camera in octant 4. The KJ5 soft X-ray camera shield is used as a pre-collimator for the LAM diagnostics. The fields-of-view of the LAM gamma-ray detectors are actually defined by the KJ5 collimator. Two solutions have been considered for the LAM beryllium target. The first proposal is to extend one of the TAE antenna protection tiles, while the other considers a separate dedicated target.
The LAM gamma-ray detectors are based on the CeBr3 scintillators [2] coupled to metal channel dynode photomultipliers. The solution for the data acquisition is based on the ATCA data acquisition platform which includes fast digitizers [3].
[1] V.G. Kiptily et al., Fusion Alpha-Particle Diagnostics for DT Experiments on the Joint European Torus, International Conference on Fusion Reactor Diagnostics, Varenna, 2013.
[2] I. Zychor et al., Physica Scripta (2015)
[3] R.C. Pereira, et al., Fusion Engineering and Design, 88 (2013) 1409
Co-authors
A. Cufar
(Slovenian Fusion Association, Jozef Stefan Institute, Ljubljana, Slovenia)
A. Fernandes
(Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal)
C. Marren
(Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom)
D. Croft
(Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom)
D. Falie
(Institute of Atomic Physics, Magurele, Ilfov, Romania)
I. Lengar
(Slovenian Fusion Association, Jozef Stefan Institute, Ljubljana, Slovenia)
I. Zychor
(Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal)
J. Figueiredo
(Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal;EUROfusion Programme Management Unit, JET, Culham Science Centre, Abingdon, United Kingdom)
K. Schoepf
(University of Innsbruck, Kegelgasse 27/13, Wien, Austria)
M. Curuia
(ICIT Rm. Valcea, Ramnicu Valcea, Romania)
N. Balshaw
(Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom)
N. Lam
(Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom)
R. C. Pereira
(Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal)
S. Mianowski
(Institute of Plasma Physics and Laser Microfusion, Narodowe Centrum Badan Jadrowych, 05-400 Otwock-Swierk, Poland)
Sorin Soare
(ICIT Rm. Valcea, Ramnicu Valcea, Romania)
T. Craciunescu
(Institute of Atomic Physics, Magurele, Ilfov, Romania;Institute of Atomic Physics, Magurele, Ilfov, Romania)
V. Braic
(Institute of Atomic Physics, Magurele, Ilfov, Romania)
V. Golonorod’ko
(University of Innsbruck, Kegelgasse 27/13, Wien, Austria)
V. Kiptily
(Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom)
V. L. Zoita
(Institute of Atomic Physics, Magurele, Ilfov, Romania)
V. Riccardo
(Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom)
V. Yavorskij
(University of Innsbruck, Kegelgasse 27/13, Wien, Austria)
Y. Krivchenkov
(Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, United Kingdom)
Z. Stancar
(Slovenian Fusion Association, Jozef Stefan Institute, Ljubljana, Slovenia)
contributors JET
(EUROfusion Programme Management Unit, JET, Culham Science Centre, Abingdon, United Kingdom)
