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Title: Gamma-to-electron magnetic spectrometer (GEMS): An energy-resolved {gamma}-ray diagnostic for the National Ignition Facility

Abstract

The gamma-to-electron magnetic spectrometer, having better than 5% energy resolution, is proposed to resolve {gamma}-rays in the range of E{sub o}{+-} 20% in single shot, where E{sub o} is the central energy and is tunable from 2 to 25 MeV. Gamma-rays from inertial confinement fusion implosions interact with a thin Compton converter (e.g., beryllium) located at approximately 300 cm from the target chamber center (TCC). Scattered electrons out of the Compton converter enter an electromagnet placed outside the NIF chamber (approximately 600 cm from TCC) where energy selection takes place. The electromagnet provides tunable E{sub o} over a broad range in a compact manner. Energy resolved electrons are measured by an array of quartz Cherenkov converters coupled to photomultipliers. Given 100 detectable electrons in the energy bins of interest, 3 Multiplication-Sign 10{sup 14} minimum deuterium/tritium (DT) neutrons will be required to measure the 4.44 MeV {sup 12}C {gamma}-rays assuming 200 mg/cm{sup 2} plastic ablator areal density and 3 Multiplication-Sign 10{sup 15} minimum DT neutrons to measure the 16.75 MeV DT {gamma}-ray line.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]; ;  [2];  [3];  [4]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. General Atomics, PO Box 85608, San Diego, California 92186 (United States)
  3. National Security Technologies, Special Technologies Laboratory, Santa Barbara, California 93111 (United States)
  4. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22093807
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BERYLLIUM; CARBON 12; COMPTON EFFECT; ELECTROMAGNETS; ELECTRON SPECTROMETERS; ENERGY RESOLUTION; GAMMA RADIATION; GAMMA SPECTROMETERS; INERTIAL CONFINEMENT; MAGNETIC SPECTROMETERS; MEV RANGE 10-100; NEUTRONS; PHOTOMULTIPLIERS; QUARTZ; TARGET CHAMBERS; US NATIONAL IGNITION FACILITY

Citation Formats

Kim, Y., Herrmann, H. W., Mack, J. M., Young, C. S., Barlow, D. B., Schillig, J. B., Sims, Jr., J. R., Lopez, F. E., Mares, D., Oertel, J. A., Hayes-Sterbenz, A. C., Hilsabeck, T. J., Wu, W., Moy, K., and Stoeffl, W. Gamma-to-electron magnetic spectrometer (GEMS): An energy-resolved {gamma}-ray diagnostic for the National Ignition Facility. United States: N. p., 2012. Web. doi:10.1063/1.4738650.
Kim, Y., Herrmann, H. W., Mack, J. M., Young, C. S., Barlow, D. B., Schillig, J. B., Sims, Jr., J. R., Lopez, F. E., Mares, D., Oertel, J. A., Hayes-Sterbenz, A. C., Hilsabeck, T. J., Wu, W., Moy, K., & Stoeffl, W. Gamma-to-electron magnetic spectrometer (GEMS): An energy-resolved {gamma}-ray diagnostic for the National Ignition Facility. United States. https://doi.org/10.1063/1.4738650
Kim, Y., Herrmann, H. W., Mack, J. M., Young, C. S., Barlow, D. B., Schillig, J. B., Sims, Jr., J. R., Lopez, F. E., Mares, D., Oertel, J. A., Hayes-Sterbenz, A. C., Hilsabeck, T. J., Wu, W., Moy, K., and Stoeffl, W. 2012. "Gamma-to-electron magnetic spectrometer (GEMS): An energy-resolved {gamma}-ray diagnostic for the National Ignition Facility". United States. https://doi.org/10.1063/1.4738650.
@article{osti_22093807,
title = {Gamma-to-electron magnetic spectrometer (GEMS): An energy-resolved {gamma}-ray diagnostic for the National Ignition Facility},
author = {Kim, Y. and Herrmann, H. W. and Mack, J. M. and Young, C. S. and Barlow, D. B. and Schillig, J. B. and Sims, Jr., J. R. and Lopez, F. E. and Mares, D. and Oertel, J. A. and Hayes-Sterbenz, A. C. and Hilsabeck, T. J. and Wu, W. and Moy, K. and Stoeffl, W.},
abstractNote = {The gamma-to-electron magnetic spectrometer, having better than 5% energy resolution, is proposed to resolve {gamma}-rays in the range of E{sub o}{+-} 20% in single shot, where E{sub o} is the central energy and is tunable from 2 to 25 MeV. Gamma-rays from inertial confinement fusion implosions interact with a thin Compton converter (e.g., beryllium) located at approximately 300 cm from the target chamber center (TCC). Scattered electrons out of the Compton converter enter an electromagnet placed outside the NIF chamber (approximately 600 cm from TCC) where energy selection takes place. The electromagnet provides tunable E{sub o} over a broad range in a compact manner. Energy resolved electrons are measured by an array of quartz Cherenkov converters coupled to photomultipliers. Given 100 detectable electrons in the energy bins of interest, 3 Multiplication-Sign 10{sup 14} minimum deuterium/tritium (DT) neutrons will be required to measure the 4.44 MeV {sup 12}C {gamma}-rays assuming 200 mg/cm{sup 2} plastic ablator areal density and 3 Multiplication-Sign 10{sup 15} minimum DT neutrons to measure the 16.75 MeV DT {gamma}-ray line.},
doi = {10.1063/1.4738650},
url = {https://www.osti.gov/biblio/22093807}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 83,
place = {United States},
year = {Mon Oct 15 00:00:00 EDT 2012},
month = {Mon Oct 15 00:00:00 EDT 2012}
}