21 results found
Turrell A, Sherlock M, Rose SJ, 2015, Ultra-fast collisional ion heating by electrostatic shocks, Nature Communications, Vol: 6, ISSN: 2041-1723
High intensity lasers can be used to generate shockwaves which have found applications in nuclear fusion, proton imaging, cancer therapies, and materials science. Collisionless electrostatic shocks are one type of shockwave widely studied for applications involving ion acceleration. Here we show a novel mechanism for collisionlesselectrostatic shocks to heat small amounts of solid density matter to temperatures of ∼ keV in tens of femtoseconds. Unusually, electrons play no direct role in the heating, and it is the ions which determine the heating rate. Ions are heated due to an interplay between the electric field of the shock, the local density increaseduring the passage of the shock, and collisions between different species of ion. In simulations, these factors combine to produce rapid, localised heating of the lighter ion species. Although the heated volume is modest, this would be one of the fastest heating mechanisms discovered if demonstrated in the laboratory.
Sherlock, Hill EG, Evans, et al., 2014, In-depth Plasma-Wave Heating of Dense Plasma Irradiated by Short Laser Pulses, Physical Review Letters, Vol: 113, ISSN: 1079-7114
Robinson APL, Strozzi DJ, Davies JR, et al., 2014, Theory of fast electron transport for fast ignition, Nuclear Fusion, Vol: 54, ISSN: 1741-4326
Fast ignition (FI) inertial confinement fusion is a variant of inertial fusion in which DT fuel is first compressed to high densityand then ignited by a relativistic electron beam generated by a fast (<20 ps) ultra-intense laser pulse, which is usually broughtin to the dense plasma via the inclusion of a re-entrant cone. The transport of this beam from the cone apex into the dense fuelis a critical part of this scheme, as it can strongly influence the overall energetics. Here we review progress in the theory andnumerical simulation of fast electron transport in the context of FI. Important aspects of the basic plasma physics, descriptionsof the numerical methods used, a review of ignition-scale simulations, and a survey of schemes for controlling the propagationof fast electrons are included. Considerable progress has taken place in this area, but the development of a robust, high-gain FI‘point design’ is still an ongoing challenge.
Bush IA, Thomas AGR, Gartside L, et al., 2014, Effect of defocusing on picosecond laser-coupling into gold cones, PHYSICS OF PLASMAS, Vol: 21, ISSN: 1070-664X
Turrell AE, Sherlock M, Rose SJ, 2013, A Monte Carlo algorithm for degenerate plasmas, JOURNAL OF COMPUTATIONAL PHYSICS, Vol: 249, Pages: 13-21, ISSN: 0021-9991
Sherlock M, Hill EG, Rose SJ, 2013, Kinetic simulations of the heating of solid density plasma by femtosecond laser pulses, HIGH ENERGY DENSITY PHYSICS, Vol: 9, Pages: 38-41, ISSN: 1574-1818
Thomas AGR, Tzoufras M, Robinson APL, et al., 2012, A review of Vlasov-Fokker-Planck numerical modeling of inertial confinement fusion plasma, JOURNAL OF COMPUTATIONAL PHYSICS, Vol: 231, Pages: 1051-1079, ISSN: 0021-9991
Ridgers CP, Sherlock M, Evans RG, et al., 2011, Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions, PHYSICAL REVIEW E, Vol: 83, ISSN: 1539-3755
Sherlock M, 2010, Generalized Ohm’s Law for a Background Plasma in the Presence of Relativistic Charged Particles, Physical Review Letters, Vol: 104, ISSN: 0031-9007
Kingham RJ, Sherlock M, Ridgers CP, et al., 2010, Vlasov-Fokker-Planck simulations of fast-electron transport with hydrodynamic plasma response, 6th International Conference on Inertial Fusion Sciences and Applications, Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588
Sherlock M, 2009, Universal scaling of the electron distribution function in one-dimensional simulations of relativistic laser-plasma interactions, Physics of Plasmas, Vol: 16, Pages: 103101-103101, ISSN: 1070-664X
Sherlock M, Rose SJ, 2009, The persistence of Maxwellian D and T distributions during burn in inertial confinement fusion, High Energy Density Physics, Vol: 5
Robinson APL, Kingham RJ, Ridgers CP, et al., 2008, Effect of transverse density modulations on fast electron transport in dense plasmas, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 50, ISSN: 0741-3335
Ping Y, Shepherd R, Lasinski BF, et al., 2008, Absorption of Short Laser Pulses on Solid Targets in the Ultrarelativistic Regime, Physical Review Letters, Vol: 100, ISSN: 0031-9007
Sherlock M, 2008, A Monte-Carlo method for coulomb collisions in hybrid plasma models, Journal of Computational Physics, Vol: 227, Pages: 2286-2292, ISSN: 0021-9991
Robinson APL, Sherlock M, Norreys PA, 2008, Artificial Collimation of Fast-Electron Beams with Two Laser Pulses, Physical Review Letters, Vol: 100, ISSN: 0031-9007
Sherlock M, Rose SJ, Robinson APL, 2007, Prediction of net energy gain in deuterium-beam interactions with an inertially confined plasma, PHYSICAL REVIEW LETTERS, Vol: 99, ISSN: 0031-9007
Sherlock M, Bell AR, Kingham RJ, et al., 2007, Non-Spitzer return currents in intense laser-plasma interactions, PHYSICS OF PLASMAS, Vol: 14, ISSN: 1070-664X
Robinson APL, Sherlock M, 2007, Magnetic collimation of fast electrons produced by ultraintense laser irradiation by structuring the target composition, Physics of Plasmas, Vol: 14, Pages: 083105-083105, ISSN: 1070-664X
Bell AR, Robinson APL, Sherlock M, et al., 2006, Fast electron transport in laser-produced plasmas and the KALOS code for solution of the Vlasov-Fokker-Planck equation, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 48, Pages: R37-R57, ISSN: 0741-3335
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