Progress of Cryogenics and Isotopes Separation


The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.



Sorin Soare1 , Mihai Anghel1, Vasile Zoita2, Tedy Craciunescu2, Marian Curuia1, Vasili Kiptily3, Trevor Edlington3, Brian Syme3 and JET EFDA contributors**

1National Research and Development Institute for Cryogenics and Isotopic Technologies - ICIT Rm. Valcea, code 240050 - Rm. Valcea, Uzinei 4, CP7 Raureni, Valcea, Romania, phone: 0040 250  736979, fax: 0040 250 732746, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
2National Institute for Laser, Plasma and Radiation Physics Bucharest, Romania
3Association EURATOM-UKAEA, Culham Science Centre, Abingdon, UK
**JET-EFDA Culham Science Centre, Abingdon, UK. See Appendix of F. Romanelli et al. Proceedings of 22nd IAEA Fusion Energy Conference, 2008, Geneva, Switzerland


A conceptual design for the upgrade of the JET tangential gamma-ray spectrometer (TGRS) has been carried out. The main design target for the TGRS upgrade is to maximize the signal-to background ratio at the spectrometer detector, the ratio being defined in terms of the plasma emitted gamma radiation and the gamma-ray background. A complex system of collimators and shields for both the neutron and gamma radiations define the spectrometer field of view. Two tandem collimators determine the field of view through the tokamak plasma. The entrance aperture to the penetration in the JET Torus Hall south wall is defined by a neutron shield. Two gamma-ray shields together with the existing concrete collimator determine the field of view at the bismuth germanate (BGO) gamma-ray detector. One of the gamma-ray shields (with an embedded neutron attenuator) can be remotely moved in and out of the detector line of sight thus providing flexibility in definition of the neutron and gamma-ray fields at the BGO detector. Neutron attenuators using lithium hydride (LiH) with natural isotopic composition (that meets the requirements for gamma-ray transparency) could provide the necessary attenuation factors (approximately 104 for the 2.45 MeV neutrons and 102 for the 14.1 MeV neutrons). A hot pressing technology has been proposed for the construction of the lithium hydride attenuators. The performance of a simplified geometry TGRS has been evaluated by preliminary neutron and photon transport calculations and the results show that the design parameters could be attained.

KEYWORDS: tokamak; diagnostics; gamma-rays