RT info:eu-repo/semantics/article
T1 Exploring extreme magnetization phenomena in directly driven imploding cylindrical targets
A1 Walsh, C A
A1 Florido, R
A1 Bailly-Grandvaux, M
A1 Suzuki-Vidal, F
A1 Chittenden, J P
A1 Crilly, A J
A1 Gigosos, M A
A1 Mancini, R C
A1 Vlachos, C
A1 McGuffey, C
A1 Beg, F N
A1 Santos, J J
A1 Pérez Callejo, Gabriel
AB This paper uses extended-magnetohydrodynamics (MHD) simulations to explore an extreme mag netized plasma regime realisable by cylindrical implosions on the OMEGA laser facility. This regimeis characterized by highly compressed magnetic fields (greater than 10 kT across the fuel), whichcontain a significant proportion of the implosion energy and induce large electrical currents in theplasma. Parameters governing the different magnetization processes such as Ohmic dissipation andsuppression of instabilities by magnetic tension are presented, allowing for optimization of experi ments to study specific phenomena. For instance, a dopant added to the target gas-fill can enhancemagnetic flux compression while enabling spectroscopic diagnosis of the imploding core. In par ticular, the use of Ar K-shell spectroscopy is investigated by performing detailed non-LTE atomickinetics and radiative transfer calculations on the MHD data. Direct measurement of the core elec tron density and temperature would be possible, allowing for both the impact of magnetization onthe final temperature and thermal pressure to be obtained. By assuming the magnetic field is frozeninto the plasma motion, which is shown to be a good approximation for highly magnetized implo sions, spectroscopic diagnosis could be used to estimate which magnetization processes are rulingthe implosion dynamics; for example, a relation is given for inferring whether thermally-driven orcurrent-driven transport is dominating.
PB Institute of Physics
SN 0741-3335
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/64387
UL https://uvadoc.uva.es/handle/10324/64387
LA spa
NO Plasma Physics and Controlled Fusion, Enero 2022, vol. 64, p. 025007
DS UVaDOC
RD 31-may-2024