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To understand the physics as well as to control and monitor plasma evolutions in fusion reactor oriented devices, fast and reliable diagnostics are needed of plasma regions where nuclear fusion occurs. In this paper, the applicability of 23.85 MeV-gamma ion-thermometry to DD/DT thermonuclear plasmas is demonstrated, using commercially available HPGe-detectors protected by a proposed differential-filter-shield (DFS) that boosts the gamma/n signal ratio from 1 x 1.0 E-7 at emission to more than 1 in the detector. The DFS proposed consists essentially of a compact all-around layered sphere shielding the detector, with a LiH window transparent to gamma radiation but opaque to neutrons. The minimal luminosity of the source required for the applicability of the method to existing and future tokamaks is discussed. Simulations are made with the 3D-MCSC-RWR numerical code.

Additional information

Authors: ROBOUCH B V, ENEA, Centro Ricerche Energia Frascati, Roma (IT);HAEGI M, ENEA, Centro Ricerche Energia Frascati, Roma (IT);BRZOSKO J S, Stevens Institute of Technology, Hoboken (US);FUBINI A, ENEA, Dipartimento Sviluppo Tecnologie di Punta, Frascati (IT);INGROSSO L, Avagadro Energy Systems Inc., New York (US)
Bibliographic Reference: Paper presented: AEA Technical Committee Meeting on alpha-particles in Fusion Research, Trieste (IT), May 10-14, 1993
Availability: Available from (1) as Paper EN 37692 ORA
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