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Near midplane scintillator-based fast ion loss detector on DIII-D.

  • Author(s): Chen, X
  • Fisher, RK
  • Pace, DC
  • García-Muñoz, M
  • Chavez, JA
  • Heidbrink, WW
  • Van Zeeland, MA
  • et al.

Published Web Location

https://doi.org/10.1063/1.4732063Creative Commons 'BY' version 4.0 license
Abstract

A new scintillator-based fast-ion loss detector (FILD) installed near the outer midplane of the plasma has been commissioned on DIII-D. This detector successfully measures coherent fast ion losses produced by fast-ion driven instabilities (≤500 kHz). Combined with the first FILD at ∼45° below the outer midplane [R. K. Fisher, et al., Rev. Sci. Instrum. 81, 10D307 (2010)], the two-detector system measures poloidal variation of losses. The phase space sensitivity of the new detector (gyroradius r(L) ∼ [1.5-8] cm and pitch angle α ∼ [35°-85°]) is calibrated using neutral beam first orbit loss measurements. Since fast ion losses are localized poloidally, having two FILDs at different poloidal locations allows for the study of losses over a wider range of plasma shapes and types of loss orbits.

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