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

X. Chen | Zendy; R. K. Fisher | Zendy; D. C. Pace | Zendy; M. García-Muñoz | Zendy; J.A. Chávez | Zendy; W. W. Heidbrink | Zendy; M. A. Van Zeeland | Zendy

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

Author(s) -

X. Chen,

R. K. Fisher,

D. C. Pace,

M. García-Muñoz,

J.A. Chávez,

W. W. Heidbrink,

M. A. Van Zeeland

Publication year - 2012

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.4732063

Subject(s) - scintillator , diii d , detector , physics , gyroradius , ion , optics , tokamak , plasma , range (aeronautics) , atomic physics , nuclear physics , computational physics , materials science , composite material , quantum mechanics

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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