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- Title
Inference of the electron temperature in inertial confinement fusion implosions from the hard X‐ray spectral continuum.
- Authors
Kagan, Grigory; Landen, O.L.; Svyatskiy, D.; Sio, H.; Kabadi, N.V.; Simpson, R.A.; Gatu Johnson, M.; Frenje, J.A.; Petrasso, R.D.; Shah, R.C.; Joshi, T.R.; Hakel, P.; Weber, T.E.; Rinderknecht, H.G.; Thorn, D.; Schneider, M.; Bradley, D.; Kilkenny, J.
- Abstract
Using the free‐free continuum self‐emission spectrum at photon energies above 15 keV is one of the most promising concepts for assessing the electron temperature in inertial confinement fusion (ICF) experiments. However, these photons are due to suprathermal electrons whose mean free path is much larger than the thermal one, making their distribution deviate from Maxwellian in a finite‐size hotspot. The first study of the free‐free X‐ray emission from an ICF implosion is conducted, accounting for the kinetic modifications to the electron distribution. These modifications are found to result in qualitatively new features in the hard X‐ray spectral continuum. Inference of the electron temperature as if the emitting electrons are Maxwellian is shown to give a lower value than the actual one.
- Subjects
ELECTRON temperature; INERTIAL confinement fusion; X-ray emission spectroscopy; ELECTRONS; EXPOSURE therapy
- Publication
Contributions to Plasma Physics, 2019, Vol 59, Issue 2, p181
- ISSN
0863-1042
- Publication type
Article
- DOI
10.1002/ctpp.201800078