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

Johnson, M. Gatu; 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:10.7910/DVN/LCYSUP

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

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Abstract

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.

Authors:

Johnson, M. Gatu; 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.

OSTI

Publication Date:: Wed Sep 19 04:00:00 UTC 2018

DOE Contract Number:: NA0002949; NA0001808

Research Org.:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; General Atomics, San Diego, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

OSTI Identifier:: 1878734

DOI:: https://doi.org/10.7910/DVN/LCYSUP

Citation Formats


                    Johnson, M. Gatu, 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., and Petrasso, R. D. Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility.  United States: N. p., 2018. 
        Web.  doi:10.7910/DVN/LCYSUP.

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                    Johnson, M. Gatu, 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. Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility.  United States.  doi:https://doi.org/10.7910/DVN/LCYSUP

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                    Johnson, M. Gatu, 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., and Petrasso, R. D. 2018.  
"Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility".  United States.  doi:https://doi.org/10.7910/DVN/LCYSUP.  https://www.osti.gov/servlets/purl/1878734. Pub date:Wed Sep 19 04:00:00 UTC 2018

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@article{osti_1878734,

  title        = {Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility},

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

  abstractNote = {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.},

  doi          = {10.7910/DVN/LCYSUP},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Wed Sep 19 04:00:00 UTC 2018},

  month        = {Wed Sep 19 04:00:00 UTC 2018}

}

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DOI: https://doi.org/10.7910/DVN/LCYSUP

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