We review a number of instruments employed in a high-intensity J-KAREN-P laser-solid interaction experiment and discuss the applicability of the diagnostics to the best target position determination with a ~10 μm accuracy, while the focal spot size was ~1 μm and peak intensity was up to 7×1021 W/cm2. We discuss both front- and back-side diagnostics, some of them operated in the infrared, visible and ultraviolet ranges, while others in the extreme ultraviolet, soft X-ray and gamma-ray ranges. We found that the applicability of some of the instruments to the best at-focus target position determination depends on the thickness of the target.
All-optical nonlinear Breit-Wheeler pair production with gamma-flash photons
High-power laser facilities give experimental access to fundamental strong-field quantum electrodynamics processes. A key effect to be explored is the nonlinear Breit-Wheeler process: the conversion of high-energy photons into electron-positron pairs through the interaction with a strong electromagnetic field. A major challenge to observing nonlinear Breit-Wheeler pair production experimentally is first having a suitable source of high-energy photons. We outline a simple all-optical setup which efficiently generates photons through the so-called gamma-flash mechanism by irradiating a solid target with a high-power laser. We consider the collision of these photons with a secondary laser, and systematically discuss the prospects for exploring the nonlinear Breit-Wheeler process at current and next-generation high-power laser facilities.
The relativistic flying mirror is a high-density electron layer which is frequently observed in the relativistic plasma produced by high-power laser pulses. The focused field strength reflected by the relativistic flying mirror can be intensified beyond the conventional limit defined by the diffraction. The relativistic flying mirror is conceived as a promising candidate for studying the strong-field quantum electrodynamic effect, by boosting the focused laser intensity toward the Schwinger field limit. In this presentation, we discuss the optical characteristics of the relativistic flying mirror and its applicability to the strong-field quantum electrodynamics study.
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