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Title: Monte-Carlo simulation of noise in hard X-ray Transmission Crystal Spectrometers: Identification of contributors to the background noise and shielding optimization

Transmission crystal spectrometers (TCS) are used on many laser facilities to record hard X-ray spectra. During experiments, signal recorded on imaging plates is often degraded by a background noise. Monte-Carlo simulations made with the code GEANT4 show that this background noise is mainly generated by diffusion of MeV electrons and very hard X-rays. An experiment, carried out at LULI2000, confirmed that the use of magnets in front of the diagnostic, that bent the electron trajectories, reduces significantly this background. The new spectrometer SPECTIX (Spectromètre PETAL à Cristal en TransmIssion X), built for the LMJ/PETAL facility, will include this optimized shielding.
Authors:
; ; ; ; ;  [1] ; ; ; ; ; ;  [2] ;  [3] ; ; ; ;  [4] ;  [5]
  1. CEA, Centre de Saclay, IRFU, F-91191 Gif-sur-Yvette (France)
  2. CELIA, Université de Bordeaux-CNRS-CEA, F-33405 Talence (France)
  3. Laboratoire Kastler Brossel, ENS, CNRS, UPMC, 75005 Paris Cedex (France)
  4. LULI Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau (France)
  5. University of Milano, via Celoria 16, 20133 Milano (Italy)
Publication Date:
OSTI Identifier:
22308598
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BACKGROUND NOISE; COMPUTERIZED SIMULATION; CRYSTALS; ELECTRONS; HARD X RADIATION; MAGNETS; MEV RANGE; MONTE CARLO METHOD; OPTIMIZATION; SHIELDING; X-RAY SPECTROMETERS