Reduction of X-ray generation in high-intensity laser ion acceleration
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In this paper, we report on measurements of bremsstrahlung in laser ion acceleration experiments from ultra-thin, polymer-based target foils. The influence of laser polarization on the generated \(\gamma\) radiation, the maximum achievable proton energy and the total proton number is investigated. A clear benefit in terms of \(\gamma\) radiation reduction by the use of circular polarized light can be observed. At the same time, the total number of accelerated protons was increased.
KeywordsAmplify Spontaneous Emission Electron Number Density Laser Polarization Target Foil Plasma Mirror
This work was partially supported by the Alliance Program of the Helmholtz Association (HA216/EMMI), by the Thuringian ministry for education, science and culture through EFRE (contract number B715-08006), by the BMBF (contract numbers 03ZIK445 and 03Z1H531), by the DFG (TR18) and by Laserlab Europe (grant agreement no. 284464, ECs 7th framework program). C. R. acknowledges support by the VolkswagenStiftung. We thank F. Ronneberger and B. Beleites for laser support and the GSI target lab for support in target preparation. AK and PG gratefully acknowledge the computational resources awarded under project numbers JJSC01 and JZAM04.
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