Speaker
Marian Curuia
(Institute of Atomic Physics)
Description
The JET tangential gamma-ray spectrometer (KM6T) is undergoing an extensive upgrade in order to make it compatible with the forthcoming deuterium-tritium (DT) experiments.
The paper will present the design of the main components for the upgrade of the spectrometer beam-line: tandem collimators, gamma-ray shields, and neutron attenuators.
The existing KM6T tandem collimators will be upgraded by installing two additional collimator modules. Two gamma-ray shields will define the gamma-ray Field-of-View at the detector end of the spectrometer Line-of-Sight. A set of three lithium hydride neutron attenuators will be used to control the level of the fast neutron flux on the gamma-ray detectors. The design of a combined movable gamma-ray shield and neutron attenuator will provide a choice of three operational conditions for deuterium and DT experiments, including that of a gamma-ray shutter.
In addition to the beam-line upgrade, other components of the KM6T spectrometer are being upgraded. The present BGO detector is going to be replaced by two detectors, based on the LaBr3 and CeBr3 scintillators. The new scintillator detectors will provide a significant improvement in terms of energy resolution (<3% at 662keV) and count rate capability (up to 1 MHz). The existing obsolete data acquisition will be replaced by a high performance FPGA-based digital data acquisition system.
The results of a feasibility study for the replacement of the radiation shielding components towards the JET diagnostics hall will also be presented. The study was done following one of the initial operational requirements of the diagnostics upgrade which was to provide means for frequent swapping of the two new gamma-ray detectors.
The design of the upgraded spectrometer beam-line has been supported by extensive radiation (neutron and photon) transport calculations using both large volume and point radiation sources. The numerical results of these calculations will be also presented in the paper.
Co-authors
A. Fernandes
(Instituto de Plasmas e Fusao Nuclear,Instituto Superior Technico, Universidade de Lisboa, Lisboa, Portugal)
B. Santos
(Instituto de Plasmas e Fusao Nuclear,Instituto Superior Technico, Universidade de Lisboa, Lisboa, Portugal)
David Croft
(CCFE, Culham Science Centre, Abingdon, United Kingdom)
Giuseppe Gorini
(Instituto di Fisica del Plasma "Piero Caldirola«, Consiglio Nazionale delle Ricerche, and Dipartimento di Fisica “G. Occhialini”, Università degli studi di Milano Bicocca, Milano, Italy)
I. Yavorskij
(University of Innsbruck, Fusion@Österreichische Akademie der Wissenschaften, Innsbruck, Austria)
I. Zychor
(Institute of Plasma Physics and Laser Microfusion, Narodowe Centrum Badan Jadrowych,, 05-400 Otwock- Swierk, Poland)
Igor Lengar
(Slovenian Fusion Association, Jozef Stefan Institute, Reactor Physics Department, Ljubljana, Slovenia)
J. Naish
(CCFE, Culham Science Centre, Abingdon, United Kingdom)
Joao Figueiredo
(Instituto de Plasmas e Fusao Nuclear,Instituto Superior Technico, Universidade de Lisboa, Lisboa, Portugal;EUROfusion Programme Management Unit, Culham Science Centre, Abingdon, United Kingdom)
K. Schoepf
(University of Innsbruck, Fusion@Österreichische Akademie der Wissenschaften, Innsbruck, Austria)
M. Nocente
(Instituto di Fisica del Plasma "Piero Caldirola«, Consiglio Nazionale delle Ricerche, and Dipartimento di Fisica “G. Occhialini”, Università degli studi di Milano Bicocca, Milano, Italy)
M. Tardocchi
(Instituto di Fisica del Plasma "Piero Caldirola«, Consiglio Nazionale delle Ricerche, and Dipartimento di Fisica “G. Occhialini”, Università degli studi di Milano Bicocca, Milano, Italy)
Marian Curuia
(Institute of Atomic Physics, Magurele, Ilfov, Romania;National R&D Institute for Cryogenics and Isotopic Technologies, Ramnicu Valcea, Romania)
R. C. Pereira
(Instituto de Plasmas e Fusao Nuclear,Instituto Superior Technico, Universidade de Lisboa, Lisboa, Portugal)
Richard Naish
(CCFE, Culham Science Centre, Abingdon, United Kingdom)
S. Mianowski
(Institute of Plasma Physics and Laser Microfusion, Narodowe Centrum Badan Jadrowych,, 05-400 Otwock- Swierk, Poland)
Sorin Soare
(Institute of Atomic Physics, Magurele, Ilfov, Romania;National R&D Institute for Cryogenics and Isotopic Technologies, Ramnicu Valcea, Romania)
Sverker Griph
(CCFE, Culham Science Centre, Abingdon, United Kingdom)
Teddy Craciunescu
(Institute of Atomic Physics, Magurele, Ilfov, Romania;National Institute for Laser, Plasma & Radiation Physics, Magurele, Ilfov, Romania)
V. Goloborod'ko
(University of Innsbruck, Fusion@Österreichische Akademie der Wissenschaften, Innsbruck, Austria)
Valeria Riccardo
(CCFE, Culham Science Centre, Abingdon, United Kingdom)
Vasile Liviu Zoita
(Institute of Atomic Physics, Magurele, Ilfov, Romania;National Institute for Laser, Plasma & Radiation Physics, Magurele, Ilfov, Romania)
Vasily Kiptily
(CCFE, Culham Science Centre, Abingdon, United Kingdom)
Viorel Braic
(Institute of Atomic Physics, Magurele, Ilfov, Romania)
