Spatial calibration of a tokamak neutral beam diagnostic using in situ neutral beam emission

Chrystal, Colin; Burrell, Keith H.; Grierson, Brian A.; Pace, David C.

doi:10.1063/1.4933337

Title: Spatial calibration of a tokamak neutral beam diagnostic using in situ neutral beam emission

Journal Article · Tue Oct 20 00:00:00 EDT 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4933337· OSTI ID:1371750

^[1];

^[2]; Grierson, Brian A. ^[3]; Pace, David C. ^[2]

Oak Ridge Associated Univ., Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Neutral beam injection is used in tokamaks to heat, apply torque, drive non-inductive current, and diagnose plasmas. Neutral beam diagnostics need accurate spatial calibrations to benefit from the measurement localization provided by the neutral beam. A new technique has been developed that uses in-situ measurements of neutral beam emission to determine the spatial location of the beam and the associated diagnostic views. This technique was developed to improve the charge exchange recombination diagnostic (CER) at the DIII-D tokamak and uses measurements of the Doppler shift and Stark splitting of neutral beam emission made by that diagnostic. These measurements contain information about the geometric relation between the diagnostic views and the neutral beams when they are injecting power. This information is combined with standard spatial calibration measurements to create an integrated spatial calibration that provides a more complete description of the neutral beam-CER system. The integrated spatial calibration results are very similar to the standard calibration results and derived quantities from CER measurements are unchanged within their measurement errors. Lastly, the methods developed to perform the integrated spatial calibration could be useful for tokamaks with limited physical access.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466

OSTI ID:: 1371750

Alternate ID(s):: OSTI ID: 1224227

Journal Information:: Review of Scientific Instruments, Vol. 86, Issue 10; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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References (11)

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Measurements of the internal magnetic field on DIII-D using intensity and spacing of the motional Stark multiplet Pablant, N. A.; Burrell, K. H.; Groebner, R. J. Review of Scientific Instruments, Vol. 79, Issue 10 https://doi.org/10.1063/1.2966596	journal	October 2008
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Active spectroscopic measurements of the bulk deuterium properties in the DIII-D tokamak (invited) Grierson, B. A.; Burrell, K. H.; Chrystal, C. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4739239	journal	October 2012
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Cited By (1)

Relative intensity calibration of the DIII-D charge-exchange recombination spectroscopy system using neutral beam injection into gas Grierson, B. A.; Burrell, K. H.; Chrystal, C. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5037333	journal	October 2018

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