In situ calibration of charged particle spectrometers on the OMEGA Laser Facility using 241 Am and 226 Ra sources

Adrian, P. J.; Armstrong, J.; Birkel, A.; Chang, C.; Dannhoff, S.; Evans, T.; Johnson, M. Gatu; Johnson, T. M.; Kabadi, N.; Kunimune, J.; Li, C. K.; Reichelt, B.; Regan, S. P.; Pearcy, J.; Petrasso, R. D.; Pien, G.; McCluskey, M.; Séguin, F. H.; Sutcliffe, G. D.; Frenje, J. A.

doi:10.1063/5.0099752

Title: In situ calibration of charged particle spectrometers on the OMEGA Laser Facility using ²⁴¹ Am and ²²⁶ Ra sources

Journal Article · Tue Nov 01 00:00:00 EDT 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0099752· OSTI ID:1970576

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^[1]; Pien, G. ^[2]; McCluskey, M. ^[2]; Séguin, F. H. ^[1];

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Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA

Charged particle spectrometry is a critical diagnostic to study inertial-confinement-fusion plasmas and high energy density plasmas. The OMEGA Laser Facility has two fixed magnetic charged particle spectrometers (CPSs) to measure MeV-ions. In situ calibration of these spectrometers was carried out using ²⁴¹ Am and ²²⁶ Ra alpha emitters. The alpha emission spectrum from the sources was measured independently using surface-barrier detectors (SBDs). The energy dispersion and broadening of the CPS systems were determined by comparing the CPS measured alpha spectrum to that of the SBD. The calibration method significantly constrains the energy dispersion, which was previously obtained through the measurement of charged particle fusion products. Overall, a small shift of 100 keV was observed between previous and the calibration done in this work.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0003868; NA0003960

OSTI ID:: 1970576

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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Title: In situ calibration of charged particle spectrometers on the OMEGA Laser Facility using ²⁴¹ Am and ²²⁶ Ra sources