NDLI: Low Emittance Proton Beam Generation in Laser Foil Interaction

Content Provider	IEEE Xplore Digital Library
Author	Miyazaki, S. Sonobe, R. Sakai, K. Kikuchi, T. Kawata, S.
Copyright Year	2005
Description	Author affiliation: Dept. of Mater. Sci. & Eng., Utsunomiya Univ. (Miyazaki, S.)
Abstract	Summary form only given. In this paper, we focused on an enhancement of proton beam quality in laser-foil interactions. Recently, a generation of a high-energy proton beam has been explored, and many interesting results have been reported. It is important to enhance the beam energy and also to improve the beam quality. Our research shows a suppression mechanism of a transverse proton divergence by a localization of electrons. When an ultra-intense laser illuminates a foil target, foil electrons are accelerated strongly by the ponderomotive pressure and high energy electron bunches are locally generated in the foil target. The electron bunches accelerated propagate to the opposite side of the laser illumination and produce a local negative potential. Consequently the transverse proton divergence is suppressed by the local potential and the high energy and the low emittance proton beam is generated. In our simulations, we calculated six combinations of the laser intensity and pulse duration for a fixed laser input energy by using 2.5-dimensional PIC (particle-in-cell) simulations. The simulation results show that the average energy of the protons accelerated is about 3 MeV for all the cases. However, a remarkable difference appears in the transverse beam emittance. For the laser intensity of $I=10^{20}$ $W/cm^{2}$ and the pulse duration of tau = 25 fast, the normalized transverse ms emittance reaches $0.92times10^{-2}$ Pi mm mrad and it is 45.2% compared with that in the case of $I=10^{19}$ $W/cm^{2}$ and tau = 250 fs
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	132
Ending Page	132
File Size	1262079
Page Count	1
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359106
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Particle beams Acceleration Protons Optical pulse generation Electron emission Laser modes Optical pulses Pulse compression methods Power engineering and energy Laser beams
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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