Tsutomu Kayoiji

TL;DR: In this article, the dependence on laser intensity and pulse duration in energetic proton acceleration by irradiation of ultrashort laser pulses on a 5μm thick copper tape target was measured.

TL;DR: A thin tape target driver for laser ion acceleration was developed in this paper, which can move a copper tape of 5 μm thickness with a positioning reproducibility of less than 30 μm (peak to valley), which is sufficient for a laser irradiation target.

TL;DR: In this paper, the 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.

TL;DR: In this article, the authors proposed a method for generating high-energy particles that significantly increases the number of times of irradiation which can be repeated consecutively and facilitates the accurate positioning of a target.

TL;DR: In this article, the authors investigated the dependence of the proton energies on the laser intensity and pulse duration and found that the maximum proton energy Ep_max and proton temperature were proportional to laser intensity, and they increased with the pulse duration.