A recoverable gas-cell diagnostic for the National Ignition Facility

Journal Article · Mon Aug 22 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4961278· OSTI ID:1342074

Ratkiewicz, A. ^[1]; Hopkins, L. Berzak  ^[1]; Bleuel, D. L. ^[1]; Bernstein, L. A. ^[2]; van Bibber, K. ^[2]; Cassata, W. S. ^[1]; Goldblum, B. L.  ^[2]; Siem, S. ^[3]; Velsko, C. A. ^[1]; Wiedeking, M. ^[4]; Yeamans, C. B.  ^[1]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2. Univ. of California, Berkeley, CA (United States)
3. Univ. of Oslo, Oslo (Norway)
4. iThemba LABS, Somerset West (South Africa)

Here, the high-fluence neutron spectrum produced by the National Ignition Facility (NIF) provides an opportunity to measure the activation of materials by fast-spectrum neutrons. A new large-volume gas-cell diagnostic has been designed and qualified to measure the activation of gaseous substances at the NIF. This in-chamber diagnostic is recoverable, reusable and has been successfully fielded. Data from the qualification of the diagnostic have been used to benchmark an Monte Carlo N-Particle Transport Code simulation describing the downscattered neutron spectrum seen by the gas cell. We present early results from the use of this diagnostic to measure the activation of ^natXe and discuss future work to study the strength of interactions between plasma and nuclei.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-07NA27344
• OSTI ID: 1342074
• Report Number(s): LLNL-JRNL-695435; RSINAK; TRN: US1701701
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; ISSN 0034-6748
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
70 PLASMA PHYSICS AND FUSION