A new concept of fusion neutron monitoring for PF-1000 device
Author:
Jednorog Slawomir1, Laszynska Ewa1, Bienkowska Barbara1, Ziolkowski Adam1, Paduch Marian1, Szewczak Kamil2, Mikszuta Katarzyna1, Malinowski Karol1, Bajdel Marcel3, Potrykus Pawel1
Affiliation:
1. Institute of Plasma Physics and Laser Microfusion, 23 Hery Str., 01-497 Warsaw, Poland , Tel.: +48 22 638 1005(45), Fax: +48 22 666 8372 2. Central Laboratory for Radiological Protection, 7 Konwaliowa Str., 03-194 Warsaw, Poland 3. Faculty of Physics, University of Warsaw, Warsaw, Poland
Abstract
Abstract
The power output of plasma experiments and fusion reactors is a crucial parameter. It is determined by neutron yields that are proportional and directly related to the fusion yield. The number of emitted neutrons should be known for safety reasons and for neutron budget management. The PF-1000 is the large plasma facility based on the plasma focus phenomenon. PF-1000 is operating in the Institute of Plasma Physics and Laser Microfusion in Warsaw. Neutron yield changes during subsequent pulses, which is immanent part of this type device and so it must be monitored in terms of neutron emission. The reference diagnostic intended for this purpose is the silver activation counter (SAC) used for many years. Our previous studies demonstrated the applicability of radio-yttrium for neutron yield measurements during the deuterium campaign on the PF-1000 facility. The obtained results were compared with data from silver activation counter and shown linear dependence but with some protuberances in local scale. Correlation between results for both neutron monitors was maintained. But the yttrium monitor registered the fast energy neutron that reached measurement apparatus directly from the plasma pinch. Based on the preliminary experiences, the yttrium monitor was designed to automatically register neutron-induced yttrium activity. The MCNP geometrical model of PF-1000 and yttrium monitor were both used for calculation of the activation coefficient for yttrium. The yttrium monitor has been established as the permanent diagnostic for monitoring fusion reactions in the PF-1000 device.
Publisher
Walter de Gruyter GmbH
Subject
Waste Management and Disposal,Condensed Matter Physics,Safety, Risk, Reliability and Quality,Instrumentation,Nuclear Energy and Engineering,Nuclear and High Energy Physics
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