Gamma Ray Measurements at OMEGA with the Newest Gas Cherenkov Detector "GCD-3". (May 2016)

• Record Type: Journal Article
• Authors: McEvoy, A M; Herrmann, H W; Kim, Y; Zylstra, A B; Young, C S; Fatherley, V E; Lopez, F E; Oertel, J A; Sedillo, T J; Archuleta, T N; Aragonez, R J; Malone, R M; Horsfield, C J; Rubery, M; Gales, S; Leatherland, A; Stoeffl, W; Johnson, M Gatu; Shmayda, W T; Batha, S H
• Is Part Of: Journal of physics. Volume 717(2016)
• Publication Date: 2016-05
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/717/1/012109
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Initial results from the newest Gas Cherenkov Detector (GCD-3) are reported demonstrating improved performance over previous GCD iterations. Increased shielding and lengthening of the Cherenkov photon optical path have resulted in a diminished precursor signal with increased temporal separation between the precursor and the primary DT Cherenkov signal. Design changes resulted in a measured GCD-3 sensitivity comparable to GCD-1 at identical 100 psia CO2 operation. All metal gasket seals and pressure vessel certification to 400 psia operation allow for a GCD-3 lower Cherenkov threshold of 1.8 MeV using the fluorinated gas C2 F6 as compared to the 6.3 MeV lower limit of GCD-1 and GCD-2. Calibration data will be used to benchmark GEANT4 and ACCEPT detector models. The GCD-3 acts as a prototype for the Super GCD being fielded at the National Ignition Facility (NIF) as part of the National Diagnostics Plan and will be installed at NIF in early 2016.