15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

8.32 Calibration and applications of imaging diagnostics on the C-2U advanced beam-driven field-reversed configuration device

17 Apr 2018, 16:00
1d 2h
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Erik Granstedt (TAE Technologies, Inc.) D. Fallah (TAE Technologies, Inc.) M. Thompson (TAE Technologies, Inc.) The TAE Team

Description

Two filtered fast-imaging instruments, with radial and axial views, respectively, were used on the C-2U device to visualize line emission from impurities and hydrogenic neutrals. Due to the accelerated pace of C-2U operations, in-vessel access was not available; as a result, novel calibration techniques needed to be developed. Spatial calibration involved optimizing parameters in a generic camera model: ex-situ using a checkerboard target and in-situ using the vacuum vessel port geometry. Photometric calibration was performed ex-situ in three stages. First, the camera relative response function was mapped using an algorithm developed for high dynamic-range imaging. Second, the non-uniformity of the optical system was measured using a large LCD monitor with known angular emission pattern. Finally, the absolute photon efficiency of each interference filter was determined using a calibrated uniform radiance source. Drift of the photometric calibration was tracked in-situ by measuring line emission from neutral beams fired into a gas target. One application using calibrated camera data was tomographic reconstruction of emissivity from O 4+ . This emissivity provided a sanity check with the excluded-flux radius inferred from wall-mounted magnetic sensors.

Primary author

Erik Granstedt (TAE Technologies, Inc.)

Co-authors

D. Fallah (TAE Technologies, Inc.) M. Thompson (TAE Technologies, Inc.) The TAE Team

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