Speaker
Roch Kwiatkowski
(National Centre for Nuclear Research)
Description
The diagnostic of fast ions at JET is based on the measurements of gamma-rays which are produced as a result of nuclear reactions between ions and plasma impurities. The gamma-ray spectra provide information on energetic tail of ion energy distribution.
The existent BGO detector, with a decay time of ~300 ns, is sufficient during DD campaigns. The strong neutron and gamma-ray fluxes during D-T experiments induces new requirements for the detector. In addition to good energy resolution it must also be characterized by high signal-to-noise ratio and allow to perform measurements at high counting rate. The scintillators which fulfill these requirements are, among others, LaBr3:Ce (already tested at JET) and CeBr3 with a decay time of ~20 ns.
We report on measurements performed with a detector module equipped with a CeBr3 scintillator. The measurements were made with standard gamma-ray sources. A strong 137137Cs source, with an activity about 400 MBq, was used to provide high counting rates. The spectra were registered with a standard voltage divider and then with an active voltage divider, specially designed at NCBJ for high counting rates. The comparison of measured and Monte Carlo simulated spectra will be presented.
This scientific work was partly supported by Polish Ministry of Science and Higher Education within the framework of the scientific financial resources in the years 2015-2017 allocated for the realization of the international co-financed project.
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Co-authors
A. Fernandes
(Instituto de Plasmas e Fusao Nuclear, Lisboa, Portugal)
Adam Szydlowski
(National Centre for Nuclear Research, Otwock, Poland)
Andrzej Broslawski
(National Centre for Nuclear Research, Otwock, Poland)
B. Santos
(Instituto de Plasmas e Fusao Nuclear, Lisboa, Portugal)
D. Croft
(CCFE Culham Science Centre, Abingdon, United Kingdom)
G. Gorini
(Instituto di Fisica del Plasma “Piero Caldirola”, Milano, Italy)
Grzegorz Boltruczyk
(National Centre for Nuclear Research, Otwock, Poland)
I. Lengar
(Jozef Stefan Institute, Ljubljana, Slovenia)
Izabela Zychor
(National Centre for Nuclear Research, Otwock, Poland)
J. Naish
(CCFE Culham Science Centre, Abingdon, United Kingdom)
K. Schoepf
(University of Innsbruck, Innsbruck, Austria)
M. Curuia
(Institute of Atomic Physics, Bucharest, Romania)
M. Nocente
(Instituto di Fisica del Plasma “Piero Caldirola”, Milano, Italy)
M. Tardocchi
(Instituto di Fisica del Plasma “Piero Caldirola”, Milano, Italy)
Marcin Gosk
(National Centre for Nuclear Research, Otwock, Poland)
R. Naish
(CCFE Culham Science Centre, Abingdon, United Kingdom)
Rica Costa Pereira
(Instituto de Plasmas e Fusao Nuclear, Lisboa, Portugal)
Roch Kwiatkowski
(National Centre for Nuclear Research, Otwock, Poland)
S. Soare
(Institute of Atomic Physics, Bucharest, Romania)
Slawomir Mianowski
(National Centre for Nuclear Research, Otwock, Poland)
Stefan Korolczuk
(National Centre for Nuclear Research, Otwock, Poland)
T. Craciunescu
(Institute of Atomic Physics, Bucharest, Romania)
V. Braic
(Institute of Atomic Physics, Bucharest, Romania)
V. Goloborodko
(University of Innsbruck, Innsbruck, Austria)
V. Kiptily
(CCFE Culham Science Centre, Abingdon, United Kingdom)
V. L. Zoita
(Institute of Atomic Physics, Bucharest, Romania)
V. Yavorskij
(University of Innsbruck, Innsbruck, Austria)
