Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility

Gatu Johnson, M.; Katz, J.; Forrest, C.; Frenje, J. A.; Glebov, V. Yu.; Li, C. K.; Paguio, R.; Parker, C. E.; Robillard, C.; Sangster, T. C.; Schoff, M.; Séguin, F. H.; Stoeckl, C.; Petrasso, R. D.

doi:10.1063/1.5035287

Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility

Journal Article · Thu Oct 11 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5035287· OSTI ID:1614414

^[1]; Katz, J. ^[2]; Forrest, C. ^[2]; ^[3]; Glebov, V. Yu. ^[2]; Li, C. K. ^[3]; Paguio, R. ^[4]; ^[3]; Robillard, C. ^[2]; ^[2]; ^[4]; Séguin, F. H. ^[3]; Stoeckl, C. ^[2]; ^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; DOE/OSTI
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
General Atomics, San Diego, CA (United States)

The Magnetic Recoil neutron Spectrometer (MRS) at the OMEGA laser facility has been routinely used to measure deuterium-tritium (DT) yield and areal density in cryogenically layered implosions since 2008. Recently, operation of the OMEGA MRS in higher-resolution mode with a new smaller, thinner (4 cm², 57 μm thick) CD₂ conversion foil has also enabled inference of the apparent DT ion temperature (T_ion) from MRS data. MRS-inferred T_ion compares well with T_ion as measured using neutron time-of-flight spectrometers, which is important as it demonstrates good understanding of the very different systematics associated with the two independent measurements. The MRS resolution in this configuration, $$ΔE_{MRS}$$ = 0.91 MeV FWHM, is still higher than that required for a high-precision T_ion measurement. We show herein how fielding a smaller foil closer to the target chamber center and redesigning the MRS detector array could bring the resolution to $$ΔE_{MRS}$$ = 0.45 MeV, reducing the systematic T_ion uncertainty by more than a factor of 4.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002949; NA0001808

OSTI ID:: 1614414

Alternate ID(s):: OSTI ID: 1477141

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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