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Title: Investigating fusion plasma instabilities in the Mega Amp Spherical Tokamak using mega electron volt proton emissions (invited)

The proton detector (PD) measures 3 MeV proton yield distributions from deuterium-deuterium fusion reactions within the Mega Amp Spherical Tokamak (MAST). The PD’s compact four-channel system of collimated and individually oriented silicon detectors probes different regions of the plasma, detecting protons (with gyro radii large enough to be unconfined) leaving the plasma on curved trajectories during neutral beam injection. From first PD data obtained during plasma operation in 2013, proton production rates (up to several hundred kHz and 1 ms time resolution) during sawtooth events were compared to the corresponding MAST neutron camera data. Fitted proton emission profiles in the poloidal plane demonstrate the capabilities of this new system.
Authors:
; ; ; ; ;  [1] ;  [2] ; ;  [3] ; ; ; ; ; ;  [4] ;  [5] ;  [4] ;  [6] ;  [7]
  1. Department of Physics, Florida International University, 11200 SW 8 ST, CP204, Miami, Florida 33199 (United States)
  2. Princeton Plasma Physics Laboratory, James Forrestal Campus, P.O. Box 451, Princeton, New Jersey 08543 (United States)
  3. Department of Physics and Astronomy, Uppsala University, Uppsala SE-751 20 (Sweden)
  4. CCFE, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB (United Kingdom)
  5. ITER Physics Department, EFDA CSU Garching, Boltzmannstrasse 2, D-85748, Garching (Germany)
  6. (United Kingdom)
  7. Australian National University, Canberra ACT 0200 (Australia)
Publication Date:
OSTI Identifier:
22308603
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM INJECTION; COMPARATIVE EVALUATIONS; DEUTERON REACTIONS; KHZ RANGE; MAST TOKAMAK; MEV RANGE; NEUTRON CAMERAS; PLASMA; PLASMA INSTABILITY; PROTON DETECTION; PROTONS; SAWTOOTH OSCILLATIONS; SI SEMICONDUCTOR DETECTORS; THERMONUCLEAR REACTIONS; TIME RESOLUTION