TITLE

Proton Acceleration to Therapeutic Energies with Ultra-Intense Ultra-Clean and Ultra-Short Laser Pulses

AUTHOR(S)
Reed, S. A.; Bulanov, S. S.; Chvykov, V.; Brantov, A.; Bychenkov, V. Yu.; Kalinchenko, G.; Matsuoka, T.; Rousseau, P.; Yanovsky, V.; Litzenberg, D. W.; Maksimchuk, A.
PUB. DATE
November 2006
SOURCE
AIP Conference Proceedings;2006, Vol. 877 Issue 1, p430
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The acceleration of protons to therapeutic energies of over 200 MeV by short-pulse, high-intensity lasers requires very high temporal intensity contrast. We describe improvements to the contrast ratio of the laser pulse produced by a multi-terawatt chirped pulsed amplification (CPA) Ti:sapphire laser for the application of proton acceleration. The modified cross-polarized wave generation (XPW) technique has been implemented on the Hercules laser at the University of Michigan to reject the low-intensity amplified spontaneous emission (ASE) preceding the main laser pulse. We demonstrate that by using two BaF2 crystals, the XPW technique yields a 10-11 contrast ratio between the main peak and the ASE for a 50 TW laser system which can be maintained up to 500 TW. Such contrast may be sufficient for a preplasma-free interaction of 225 TW laser pulses with sub-micron thick foils at an intensity of ∼1022 W/cm2. Particle-in-cell (PIC) simulations were conducted under the anticipated experimental conditions: 6.75 J, 30 fs laser pulse without a prepulse, focused to a spot size of 1.2 microns (FWHM) on thin foils of varying thickness. The performed PIC simulations show that for a 0.2 μm thick hydrogen foil protons with energy up to 200 MeV can be produced. In the case of the two-layer aluminum-hydrogen foil, the maximum energy of accelerated protons is about 150 MeV, but the flux-energy spectrum of the accelerated protons has a narrow peak at high energies, which may be more advantageous for medical applications. © 2006 American Institute of Physics
ACCESSION #
23356735

 

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