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Kansai Photon Science Institute   |   The 3rd KPSI Seminar Studies of fast electrons emitted in intense laser-solid interaction experiments

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Kansai Photon Science Institute >> KPSI Seminar >> Studies of fast electrons emitted in intense laser-solid interaction experiments

 

Seminar

The 3rd KPSI Seminar

Studies of fast electrons emitted in intense laser-solid interaction experiments

 

Presentor Prof. David NEELY
(Central Laser Facility, Rutherford Appleton Laboratory, United Kingdom)
Jobstatus STFC Fellow
Place ITBL G201 room (KPSI)
Date 11:00 - 12:00 (Mon.) May. 16, 2016
Language English
Chairperson Kiminori KONDO

Studies of fast electrons emitted in intense laser-solid interaction experiments

Prof. David NEELY
(Central Laser Facility, STFC, Rutherford Appleton Laboratory, Chilton, DIDCOT, Oxon, OX11 0QX, UK
SUPA, Department of Physics, University of Strathclyde, Glasgow, UK)

abstract

The transport of high currents of electrons which are created inside solid targets when irradiated at intensities of >10^18 Wcm^-2 determines the magnitude of the sheath fields present on the rear of the target from which ions can be accelerated. For many applications, understanding the interplay between the internal electrons, the escaping electron fraction and the transfer of energy to secondary ions is central to being able to develop new sources.

In studies carried out using ps pulses at 1.05 microns, the angular escaping ion and electron fluxes^1 were characterized and the total energy content evaluated as a function of intensity. Under suitable conditions, the conversion of the incident laser energy into either escaping electrons or ions can readily exceed 10%. As the intensity is increased, by decreasing the focal spot area using constant laser drive energy, the total energy of the escaping electrons reaches a maximum and then decreases. The explanation for this experimental observation in terms of the magnitude and area of the sheath field will be presented and the implications for future experiments explored.

Recent developments of high efficiency plasma mirrors (96%) and way of attaining ultra high intensities will also be presented.

 

References:

[1] D Rusby /et al,/ /Measurement of the Angle, Temperature and Flux of Fast Electrons,/Journal of Plasma Physics, 81, 05, 47581050, 2015

[2] C. Brenner /et al, High energy conversion efficiency in laser-proton acceleration by controlling laser-energy deposition onto thin foil targets/, Applied Physics Letters, 104, 081123, 2014

[3] G. Scott/et al/, /Optimization of plasma mirror reflectivity and optical quality using double laser pulse,s/ New J. Physics, 17, 033027, 2015

 

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