Abstract Details
QUASI-MONOENERGETIC PROTON BEAM FROM THE INTERACTIONS OF ULTRA-INTENSE LASER AND TAILORED HOLE TARGETS
Author: Yanyun MA
Requested Type: Oral Only
Submitted: 2009-04-15 12:36:16
Co-authors: T. P. Yu, S. Kawata, M. Y. Yu and M. Chen
Contact Info:
National University of Defense Technology
Yanwachi street
Changsha, Hunan 410073
China
Abstract Text:
We have proposed a scheme to generate quasi-monoenergetic proton beam from the interactions of an ultra-intense laser pulse and thin tailored hole targets (shown in Fig 1). In our scheme, the ultra-intense laser impinges on the target, and then the protons on the bottom of the hole can experience an approximately-uniform sheath electric field and are accelerated by the field. At last a monoenergetic proton beam will be generated. With the help of the 2D3V PIC code PLASIM, we observed quasi-monoenegetic proton beams produced from such targets. Particle-in-cell simulations show that these monoenergetic protons are produced from highly localized uniform electric fields (sheath fields) by the mechanism of target normal sheath acceleration (TNSA) in the hole. The transverse electric fields in the hole can suppress the transverse divergence of the protons very well. The dependence of the proton beam quality on the focal radius and hole structure is also investigated. This special tailed target together with optimized laser parameters can serve as sources for collimated and quasimonoenergetic proton beams.
Comments: