Nuclear reaction diagnostics of fast confined and escaping alpha particles

Abstract

The resonant nuclear reactions D(a,y) bLi, 6Li(a,y) 1<>]3, and 7Li(a,y) liB are examined as diagnostics of the energy distribution of confined fast alpha particles in tokamak plasmas.Reaction rates for Q = I D-T plasmas are estimated. The design of and preliminary results from the prototype fusion gamma ray detector on the tokamak fusion test reactor (TFTR) will be presented. The activation reactions lOB(a,n) 13N, 14N(a,y) Hlp, 2SMg(a,p) 28Al, and 27Al(a,p) 30p are similarly examined as diagnostics offast escaping alpha particles. Count rate estimates for Q = 1 D-T plasmas will be presented.

Charged fusion product loss measurements using nuclear activation

“…Techniques capable of operating in ITER harsh environment need further development [1,2]. A number of measurement techniques have been proposed [3][4][5][6][7][8][9]. Probably several techniques will be needed in order to satisfy measurements criteria, minimize risks and increase measurements reliability.…”

In-vessel activation monitors in JET: Progress in modeling

“…Georges Bonheure, 1 I. Lengar, 2 B. Syme, 3 Elisabeth Wieslander, 4 Mikael Hult, 4 Joël Gasparro, 4 Gerd Marissens, 4 Dirk Arnold, 5 Matthias Laubenstein, 6 S. Popovichev, 3 and JET-EFDA Contributors 7 Activation studies were performed in JET with new in-vessel activation monitors. Though primarily dedicated to R&D in the challenging issue of lost ␣ diagnostics for ITER, which is being addressed at JET with several techniques, these monitors provide for both neutron and charged particle fluences.…”

“…1͒ have been developed at JET with the aim to study activation induced by charged fusion products and other MeV ions. [3][4][5] Material samples are activated due to nuclear reactions of types ͑z , n͒, ͑z , ␥͒ ,..., where z is a light charged particle p, t, d, 3 He, or ␣. After plasma exposure, samples are removed from the sample holder and ultralow-level gamma-ray spectrometry 5-7 of samples is performed.…”

Fusion alpha loss diagnostic for ITER using activation technique

“…Alpha particle loss measurements in particular remain extremely difficult [2,3]. A number of standard measurement methods [4][5][6][7][8][9][10] have been proposed but techniques capable of operating in the fusion reactor conditions need further developments. Direct charged particle detection in the fusion alpha energy range (3.6 MeV) relies on two fundamental interaction processes: (i) inelastic scattering on atomic electrons and (ii) nuclear reactions.…”