Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility
- OSTI
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 cm[sup]2, 57-um thick) CD2 conversion foil has also enabled inference of the apparent DT ion temperature (Tion) from MRS data. MRS-inferred Tion compares well with T[sub]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, deltaEMRS=0.91 MeV FWHM, is still higher than required for a high-precision Tion measurement. We show how fielding a smaller foil closer to target chamber center and redesigning the MRS detector array could bring the resolution to deltaEMRS=0.45 MeV, reducing the systematic Tion uncertainty by more than a factor of 4.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- NA0002949; NA0001808
- OSTI ID:
- 1878734
- Country of Publication:
- United States
- Language:
- English
Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility
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journal | October 2018 |
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