Hot solid-state aluminum plasmas, positrons, and neutrons generated with the garching laser facility ATLAS

Details Hot solid-state aluminum plasmas, positrons, and neutrons generated with the garching laser facility ATLAS Hot solid-state aluminum plasmas, positrons, and neutrons generated with the garching laser facility ATLAS

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..611..221w&link_type=abstract

SUPERSTRONG FIELDS IN PLASMAS: Second International Conference on Superstrong Fields in Plasmas, Second International Conference

Physics

1

Plasma Production And Heating By Laser Beams, X-Ray, Gamma-Ray, And Particle Generation, Self-Focussing, Channeling, And Filamentation In Plasmas

Scientific paper

We report on time-integrated and time-resolved measurements of the K-shell emission from aluminum plasmas at solid-state density isochorically heated with 2-ω ATLAS pulse of high contrast. We compare the measured spectra with simulated ones. We investigate both plane aluminum and layered targets. The latter consist of a top carbon layer upon an aluminum layer of variable thickness deposited on a sigradur (glass:like carbon) substrate. The layered targets are well suited to study electron beam transport through an overdense plasma. In a different type of experiment, we have produced 106 positrons per laser shot by the interaction of an MeV-electron jet emerging from a relativistically self-focused laser channel in an underdense helium plasma whose density is close to the critical one using a 2-mm thick lead disk. We report about details of the measurement and discuss the propsects of this new table-top positron source for a variety of applications when near-future laser systems are envisaged as a driver. For the neutron generation, we used 790-nm/130-fs/1-J ATLAS pulses focused onto fully deuterated polyethylene targets at intensities of up to 1019 W/cm2. We observe neutron yields of up to 105 per shot. We discuss how the measured neutron spectra can be related to the ion energy distribution. .

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