Development of a bright MeV photon source with compound parabolic concentrator targets on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Florida A & M University, Tallahassee, FL (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Georgia Institute of Technology, Atlanta, GA (United States)
- General Atomics, San Diego, CA (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Material Physics Group, AWE Plc, Reading (United Kingdom)
Compound parabolic concentrator (CPC) targets are utilized at the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser to enhance the acceleration of electrons and production of high energy photons, for laser durations of 10 ps and energies up to 2.4 kJ. A large enhancement of mean electron energy (>2 ×) and photon brightness (>10×) is found with CPC targets compared to flat targets. Using multiple diagnostic techniques at different spatial locations and scaling by gold activation spatial data, photon spectra are characterized for Ephoton = 0.5-30 MeV. Beam width and pointing variations are given. The efficient production of MeV photons at Ilaser ≈ 2 x 1018 W/cm2 with CPCs is observed, with doses of >10 rad in air at 1 m for Ephoton > 0.5 MeV; these exceed those previously reported with laser-driven sources. Using this source, sub-mm resolution radiographs are generated through large areal density radiograph objects. Hence these results are promising for the development of bright MeV x-ray and particle sources on Petawatt class laser systems.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC52-07NA27344; NA0001808; 19-SI-002
- OSTI ID:
- 1962481
- Alternate ID(s):
- OSTI ID: 1907715
- Report Number(s):
- LLNL-JRNL-839566; 1059651; TRN: US2313080
- Journal Information:
- Physics of Plasmas, Vol. 30, Issue 1; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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