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Open Access Publications from the University of California

A 15 MeV proton diagnostic for DIII-D

  • Author(s): Duong, HH
  • Heidbrink, WW
  • et al.

Published Web Location Commons 'BY' version 4.0 license

A 15 MeV proton diagnostic that is patterned after the ASDEX proton probe is presently being fabricated for the DIII-D tokamak. A bellows assembly inserts a silicon detector into the vacuum for plasma operation and retracts it for baking. The detector preamplifier is situated in a reentrant tube (at atmosphere) beside the detector; electrically, the whole assembly is referenced to vessel potential. Orbit calculations in realistic magnetic field geometries predict a proton detection efficiency of O(10-7). The diagnostic will be used for burnup studies at high β and particle transport studies in the H mode.

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