MeV-order proton and carbon ion acceleration by irradiation of 60 fs TW laser pulses on thin copper tape

Takashi Fujii; Yuji Oishi, L.; Takuya Nayuki, L.; Yasushi Takizawa, L.; Koshichi Nemoto, L.; Tsutomu Kayoiji, L.; Kazuhiko Horioka, L.; Yasuaki Okano, L.; Yoichiro Hironaka, L.; Nakamura, Kazutaka G.; Ken-ichi Kondo, Kazutaka G.
August 2003
Applied Physics Letters;8/25/2003, Vol. 83 Issue 8, p1524
Academic Journal
We obtained high-energy ions by irradiating 60 fs laser pulses onto a copper tape target of 5 μm thickness. The proton was accelerated with energy of 1.2 MeV at laser intensity of 6.8×10[sup 18] W/cm[sup 2]. The equivalent Boltzmann temperature of the proton was 185 keV which was less than the ponderomotive potential (650 keV) of an electromagnetic standing wave in a laser field. Moreover, we observed the acceleration of carbon ions with energy of more than 0.4 MeV at laser intensity of 3.4×10[sup 18] W/cm[sup 2]. © 2003 American Institute of Physics.


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