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Streaked optical pyrometer for proton-driven isochoric heating experiments of solid and foam targets

Journal Article · · AIP Advances
DOI:https://doi.org/10.1063/1.5121538· OSTI ID:1630872
 [1];  [2];  [2];  [2];  [2];  [3];  [2];  [4];  [4];  [4];  [2]
  1. Univ. of Texas, Austin, TX (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Texas, Austin, TX (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
We have designed, built, and calibrated an ultrafast streaked optical pyrometer (SOP) with ~5 ps resolution for measuring the time-resolved surface blackbody temperature of an isochorically heated plasma. The pyrometer is calibrated to measure temperatures from 0.5 eV to 25 eV, with the option of adding calibrated neutral density filters to observe hotter plasmas. We demonstrated the use of this pyrometer on isochoric heating experiments using laser-accelerated proton beams as an energy source at the $$f$$ /40 beamline of the Texas Petawatt Laser. We used the large focal spot size (~80 μm radius) of the $$f$$ /40 pulses to accelerate high numbers of ~MeV protons off 5 μm thick solid gold targets. During our experimental campaign, we heated 10 μm thick aluminum foil targets to 1–10 eV over a duration of 50 ps and also observed heating to ~2 eV in 100 μm thick 60 mg/cm3 carbon foams using the SOP to measure both the temperature and heating timescale.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Defense Advanced Research Projects Agency (DARPA); US Air Force Office of Scientific Research (AFOSR); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC02-76SF00515; NA0002008
OSTI ID:
1630872
Alternate ID(s):
OSTI ID: 1632965
OSTI ID: 1638223
Report Number(s):
LA-UR--19-32004
Journal Information:
AIP Advances, Journal Name: AIP Advances Journal Issue: 4 Vol. 10; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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