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Title: Neutron imaging with the short-pulse laser driven neutron source at the TRIDENT Laser Facility

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4964248· OSTI ID:1361476
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  1. Spectral Sciences, Burlington, MA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics, ELI-Beamlines
  4. Axis Communications AB, Lund (Sweden)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik
  7. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Emerging approaches to short-pulse laser-driven neutron production offer a possible gateway to compact, low cost, and intense broad spectrum sources for a wide variety of applications. They are based on energetic ions, driven by an intense short-pulse laser, interacting with a converter material to produce neutrons via breakup and nuclear reactions. Recent experiments performed with the high-contrast laser at the Trident laser facility of Los Alamos National Laboratory have demonstrated a laser-driven ion acceleration mechanism operating in the regime of relativistic transparency, featuring a volumetric laser-plasma interaction. This mechanism is distinct from previously studied ones that accelerate ions at the laser-target surface. The Trident experiments produced an intense beam of deuterons with an energy distribution extending above 100 MeV. This deuteron beam, when directed at a beryllium converter, produces a forward-directed neutron beam with ~5x109 n/sr, in a single laser shot, primarily due to deuteron breakup. The neutron beam has a pulse duration on the order of a few nanoseconds with an energy distribution extending from a few hundreds of keV to almost 80 MeV. For the experiments on neutron-source spot-size measurements, our gated neutron imager was setup to select neutrons in the energy range of 2.5 to 35 MeV. The spot size of neutron emission at the converter was measured by two different imaging techniques, using a knife-edge and a penumbral aperture, in two different experimental campaigns. The neutron-source spot size is measured ~1 mm for both experiments. The measurements and analysis reported here give a spatial characterization for this type of neutron source for the first time. In addition, the forward modeling performed provides an empirical estimate of the spatial characteristics of the deuteron ion-beam. Finally, these experimental observations, taken together, provide essential yet unique data to benchmark and verify theoretical work into the basic acceleration mechanism, which remains an ongoing challenge.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1361476
Alternate ID(s):
OSTI ID: 1329083
Report Number(s):
LA-UR-16-23328
Journal Information:
Journal of Applied Physics, Vol. 120, Issue 15; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Laser-plasmas in the relativistic-transparency regime: Science and applications journal May 2017
Intense, directed neutron beams from a laser-driven neutron source at PHELIX journal May 2018
A remotely triggered fast neutron detection instrument based on a plastic organic scintillator journal February 2018
Requirements and sensitivity analysis for temporally- and spatially-resolved thermometry using neutron resonance spectroscopy journal September 2019
Extreme brightness laser-based neutron pulses as a pathway for investigating nucleosynthesis in the laboratory journal September 2019
Efficient laser acceleration of deuteron ions through optimization of pre-plasma formation for neutron source development journal November 2018
Neutron Imaging at LANSCE—From Cold to Ultrafast journal February 2018