Different effects of a laser prepulse on the proton generation between plastic and metal targets irradiated by an ultraintense laser pulse
- Quantum Optics Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of)
The effect of a laser prepulse on the generation of proton beams is compared between plastic and metal targets by irradiating a 30 fs, 2.4x10{sup 18} W/cm{sup 2} Ti:sapphire laser pulse. Proton energies generated from both target materials increase as the pulse duration of the laser prepulse decreases. However, it was found that there are distinct differences with respect to target materials. In the case of aluminum targets, as target thickness decreases, proton energy gets higher, which is well described by an isothermal expansion model. However, in the case of Mylar targets, no such dependence on target thickness could be observed, and the highest maximum proton energies are higher by factors of 1.5 to 3 than those from aluminum targets or those predicted by the isothermal expansion model. Such characteristics of the proton beams from Mylar targets can be accounted for by a bulk acceleration model, or acceleration by a resistively induced electric field.
- OSTI ID:
- 21272473
- Journal Information:
- Physics of Plasmas, Vol. 16, Issue 1; Other Information: DOI: 10.1063/1.3056398; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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