EPJ Web of Conferences (Nov 2013)

In situ calibration of the Gamma Reaction History instrument using reference samples (“pucks”) for areal density measurements

  • Hoffman N.M.,
  • Herrmann H.W.,
  • Kim Y.H.,
  • Hsu H.H.,
  • Horsfield C.J.,
  • Rubery M.S.,
  • Wilson D.C.,
  • W. Stoeffl W.,
  • Young C.S.,
  • Mack J.M.,
  • Miller E.K.,
  • Grafil E.,
  • Evans S.C.,
  • Sedillo T.J.,
  • Glebov V.Yu.,
  • Duffy T.

DOI
https://doi.org/10.1051/epjconf/20135913019
Journal volume & issue
Vol. 59
p. 13019

Abstract

Read online

The introduction of a sample of carbon, for example a disk or “puck”, near an imploding DT-filled capsule creates a source of 12C gamma rays that can serve as a reference for calibrating the response of the Gamma Reaction History (GRH) detector [1]. Such calibration is important in the measurement of ablator areal density ⟨ρR⟩abl in plastic-ablator DT-filled capsules at OMEGA [2], by allowing ⟨ρR⟩abl to be inferred as a function of ratios of signals rather than from absolute measurements of signal magnitudes. Systematic uncertainties in signal measurements and detector responses therefore cancel, permitting more accurate measurements of ⟨ρR⟩abl.