Abstract
We have designed and constructed various experimental systems to perform interaction experiments with a 100-TW Ti:sapphire laser and a solid or a gas target, and we have used them for proton, electron, and X-ray generations. They consist of a laser beam delivery system, a target chamber, a laser focusing and monitoring system, a target manipulation system, and target diagnostic systems, such as a visible emission imager and an X-ray pinhole camera. The laser beam can be focused with a peak intensity as large as ∼10 W/cm and a focal spot size as small as ∼4 μm. The solid target is precisely positioned at the laser focus with an accuracy of ∼20 μm, which is much smaller than the Rayleigh range of the focused laser beam. The target diagnostic systems allow us to investigate the status of laser-target interactions with real-time and online operation when the laser and the target conditions are optimized to obtain the desired characteristics for the proton, electron, and X-ray sources. Strong correlations between the images in the diagnostic systems and monoenergetic electron and higher-energy proton generations are presented.
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