Upgrades to the gamma ray imager on DIII-D enabling access to high flux hard x-ray measurements during the runaway electron plateau phase (invited)

Lvovskiy, A.; Paz-Soldan, C.; Eidietis, N.; Dal Molin, A.; Nocente, M.; Cooper, C.; Rigamonti, D.; Tardocchi, M.; Taussig, D.

doi:10.1063/5.0101690

Title: Upgrades to the gamma ray imager on DIII-D enabling access to high flux hard x-ray measurements during the runaway electron plateau phase (invited)

Journal Article · Wed Nov 09 00:00:00 EST 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0101690· OSTI ID:1970615

;

; Eidietis, N.; Dal Molin, A.;

; Cooper, C.;

;

; Taussig, D.

The Gamma Ray Imager (GRI) is a pinhole camera providing 2D imaging of MeV hard x-ray (HXR) bremsstrahlung emission from runaway electrons (REs) over the poloidal cross section of the DIII-D tokamak. We report a series of upgrades to the GRI expanding the access to RE scenarios from the diagnosis of a trace amount of REs to high flux HXR measurements during the RE plateau phase. We present the implementation of novel gamma ray detectors based on LYSO and YAP crystals coupled to multi-pixel photon counters, enabling a count rate in excess of 1 MHz. Finally, we highlight new insights into the RE physics discovered during the current quench and RE plateau phase experiments as the result of these upgrades.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1970615

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Vol. 93 Journal Issue: 11; ISSN 0034-6748

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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