Abstract
Proton radiography is a key diagnostics to measure and image the electric/magnetic field in laser-produced plasmas. A thin solid target is irradiated with an intense laser pulse to produce a proton beam. The accelerated proton can achieve higher energy with thinner target. In order to produce an extremely thin target, we have developed a large-area suspended graphene as a laser target for energetic ion sources. We describe the manufacturing process of the suspended graphene, and show the results of quality evaluations.
Highlights
We have worked on the so-called laboratory astrophysics, where space and astrophysical phenomena are experimentally simulated in laboratories with high-power lasers, such as plasma jet[1,2,3,4], collisionless shocks[5,6,7,8,9,10] and hydrodynamic instabilities[11, 12]
We recently extended our research field to include the relativistic regime of laboratory astrophysics with intense laser pulses[13,14,15]
We have observed a turbulent electric field excited by Kelvin–Helmholtz instability associated with collisionless shocks in laser-produced plasmas[7], and have observed time evolution of electric/magnetic structure formation in counterstreaming laser-produced plasmas[9] with proton radiography
Summary
We have worked on the so-called laboratory astrophysics, where space and astrophysical phenomena are experimentally simulated in laboratories with high-power lasers, such as plasma jet[1,2,3,4], collisionless shocks[5,6,7,8,9,10] and hydrodynamic instabilities[11, 12]. Focusing an ultra intense laser onto a solid target, high energy radiations such as X-rays and gamma-rays will be emitted due to the interaction between the forced oscillating relativistic electrons by the laser electric field and the nuclei of target material. In order to suppress this, we need to reduce the number of atoms in the ionized volume. To this end, we reduce the target thickness and choose the low atomic number material. Stable mass production of low atomic number freestanding ultra-thin targets with nanometer accuracy allows us to investigate ion acceleration such as the RPA in the future. We use the energetic ion beams to measure electric/magnetic field on laboratory astrophysics experiments
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