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

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4890534· OSTI ID:22308598

Reverdin, C.; Duval, A.; Leboeuf, X.; Lecherbourg, L.; Rossé, B. ^[1]; Hulin, S.; Batani, D.; Santos, J. J.; Vaisseau, X.; Fourment, C.; Giuffrida, L. ^[2]; Szabo, C. I. ^[3]; Bastiani-Ceccotti, S.; Brambrink, E.; Koenig, M.; Nakatsutsumi, M. ^[4]; Morace, A. ^[5]

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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)

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.

• OSTI ID: 22308598
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

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