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Persistent URL	http://purl.org/net/epubs/work/62253
Record Status	Checked
Record Id	62253
Title	Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing
Contributors	MH Xu, YT Li, DC Carroll (Strathclyde Univ.), PS Foster (STFC Rutherford Appleton Lab.), S Hawkes (STFC Rutherford Appleton Lab.), S Kar, F Liu, K Markey, P McKenna (Strathclyde Univ.), MJV Streeter (STFC Rutherford Appleton Lab.), C Spindloe (STFC Rutherford Appleton Lab.), ZM Sheng, C- Wahlstrom, M Zepf, J Zheng, J Zhang, D Neely (STFC Rutherford Appleton Lab.)
Abstract	A simple method to enhance ion generation with femtosecond ultraintense lasers is demonstrated experimentally by defocusing laser beams on target surface. When the laser is optimally defocused, we find that the population of medium and low energy protons from ultra-thin foils is increased significantly while the proton cutoff energy is almost unchanged. In this way, the total proton yield can be enhanced by more than 1 order, even though the peak laser intensity drops. The depression of the amplified spontaneous emission (ASE) effect and the population increase of moderate-energy electrons are believed to be the main reasons for the effective enhancement.
Organisation	CLF , CLF-HPL , CLF-ASTRA , CI , STFC
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Language	English (EN)

Type	Details	URI(s)	Local file(s)	Year
Journal Article	Appl Phys Lett 100, no. 8 (2012): 084101.	doi:10.1063/1.3688027		2012