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Fast collisional electron heating and relaxation in thin foils driven by a circularly polarized ultraintense short-pulse laser
摘要： The creation of well-thermalized, hot and dense plasmas is attractive for warm dense matter studies. We investigate collisionally induced energy absorption of an ultraintense and ultrashort laser pulse in a solid copper target using particle-in-cell simulations. We ?nd that, upon irradiation by a 2 × 1020 W cm?2 intensity, 60 fs duration, circularly polarized laser pulse, the electrons in the collisional simulation rapidly reach a well-thermalized distribution with ～3.5 keV temperature, while in the collisionless simulation the absorption is several orders of magnitude weaker. Circular polarization inhibits the generation of suprathermal electrons, while ensuring ef?cient bulk heating through inverse bremsstrahlung, a mechanism usually overlooked at taking account of both collisional and ?eld ionization, yields similar results: the bulk electrons are heated to ～2.5 keV, but with a somewhat lower degree of thermalization than in the pre-set, ?xed-ionization case. The collisional absorption mechanism is found to be robust against variations in the laser parameters. At ?xed laser pulse energy, increasing the pulse duration rather than the intensity leads to a higher electron temperature.
关键词： plasma dynamics,plasma heating,plasma simulation
更新于2025-09-23 15:21:01
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Sequential modelling of ICRF wave near RF fields and asymptotic RF sheaths description for AUG ICRF antennas
摘要： A sequence of simulations is performed with RAPLICASOL and SSWICH to compare two AUG ICRF antennas. RAPLICASOL outputs have been used as input to SSWICH-SW for the AUG ICRF antennas. Using parallel electric field maps and the scattering matrix produced by RAPLICASOL, SSWICH-SW, reduced to its asymptotic part, is able to produce a 2D radial/poloidal map of the DC plasma potential accounting for the antenna input settings (total power, power balance, phasing). Two models of antennas are compared: 2-strap antenna vs 3-strap antenna. The 2D DC potential structures are correlated to structures of the parallel electric field map for different phasing and power balance. The overall DC plasma potential on the 3-strap antenna is lower due to better global RF currents compensation. Spatial proximity between regions of high RF electric field and regions where high DC plasma potentials are observed is an important factor for sheath rectification.
关键词： plasma heating,SSWICH,ICRF antennas,RAPLICASOL,RF-sheath rectification
更新于2025-09-10 09:29:36