Effects of laser prepulse on proton generation: Active manipulation of the distribution of laser accelerated proton beams

D. Batani, R. Redaelli, R. Dezulian, O. Lundh, F. Lindau, A. Persson, K. Osvay, C. G. Wahlström, D. C. Carroll, P. McKenna, S. Bandyopadhyay, D. Pepler, D. Neely, S. Kar, P. T. Simpson, K. Markey, M. Zepf, M. H. Xu, Y. T. Li

Research output: Conference contribution

Abstract

Laser pre-pulse is a major issue in experiments on laser-generation of protons, often limiting the performances of laser sources. In this paper, we show how we can actively use a low intensity prepulse (<10 13W/cm2, ns duration) to manipulate the proton beam direction or spatial energy distribution. The prepulse is focused onto the front surface of a thin foil before the arrival of the high intensity pulse (≈1019W/cm2, ps duration). Under oblique high-intensity irradiation and for low prepulse intensities, the proton beam is directed away from the target normal. Deviation is towards the laser forward direction, with an angle that increases with the level and duration of the ASE pedestal. Also, for a given laser pulse, beam deviation increases with proton energy. The observations are discussed in terms of Target Normal Sheath Acceleration, in combination with a laser-controllable shock wave locally deforming the target surface. Results obtained with an annular intensity distribution of the prepulse show smooth proton beams with a sharp circular boundary at all energies. Potential mechanisms to explain the observations are discussed.

Original languageEnglish
Title of host publicationLaser-Driven Relativistic Plasmas Applied for Science, Industry, and Medicine - The 1st International Symposium
Pages78-89
Number of pages12
DOIs
Publication statusPublished - aug. 18 2008
Event1st International Symposium on Laser-Driven Relativistic Plasmas Applied for Science, Industry, and Medicine - Kyoto, Japan
Duration: szept. 17 2007szept. 20 2007

Publication series

NameAIP Conference Proceedings
Volume1024
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other1st International Symposium on Laser-Driven Relativistic Plasmas Applied for Science, Industry, and Medicine
CountryJapan
CityKyoto
Period9/17/079/20/07

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Batani, D., Redaelli, R., Dezulian, R., Lundh, O., Lindau, F., Persson, A., Osvay, K., Wahlström, C. G., Carroll, D. C., McKenna, P., Bandyopadhyay, S., Pepler, D., Neely, D., Kar, S., Simpson, P. T., Markey, K., Zepf, M., Xu, M. H., & Li, Y. T. (2008). Effects of laser prepulse on proton generation: Active manipulation of the distribution of laser accelerated proton beams. In Laser-Driven Relativistic Plasmas Applied for Science, Industry, and Medicine - The 1st International Symposium (pp. 78-89). (AIP Conference Proceedings; Vol. 1024). https://doi.org/10.1063/1.2958208