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Oral presentation

Simulation studies on acceleration of background gas ions in clustered media irradiated by high power lasers

Matsui, Ryutaro; Fukuda, Yuji; Kanasaki, Masato; Sakaki, Hironao; Iwata, Natsuyo*; Kondo, Kiminori; Kishimoto, Yasuaki*

no journal, , 

In the experiment conducted at JAEA-KPSI, we have observed an acceleration of background gas ions as a result of the interaction between a high peak power laser pulses and clustered media, where a few hundreds nanometer sized CO$$_{2}$$ clusters are embedded in a background H$$_{2}$$ gas. In order to understand the acceleration mechanism of the background gas ions, we have carried out numerical simulations using the 2D PIC codes in the parameter regime relevant to the experiment. The simulation results shows that background gas ions are compressed and accelerated due to the Coulomb explosion of clusters. In addition, some ions are accelerated in the laser propagation direction due to the anisotropic electric field created by the relativistic effect.

Oral presentation

Structure of electric field and dynamics of contact surface due to the interaction between cluster and background gas irradiated by high power lasers

Matsui, Ryutaro; Fukuda, Yuji; Kawahito, Daiki*; Kishimoto, Yasuaki*

no journal, , 

In interactions between a high peak power laser pulses and clustered media, where CO$$_{2}$$ clusters are embedded in a background H$$_{2}$$ gas, as the resent experiment at JAEA-KPSI shows, the Coulomb explosion of clusters contributes to the acceleration of background gas ions. In order to understand the dynamics of the cluster expansion in the ambient gas, we have carried out numerical simulations using the 2D PIC codes in the parameter regime relevant to the experiment. The simulation results show that the charge separation and the electric field formation near the contact surface of a cluster and background gas play an important role in the structure formation of a cluster expansion.

Oral presentation

Forward acceleration of 100-MeV protons triggered by intense laser irradiation of H$$_{2}$$ cluster targets

Matsui, Ryutaro; Fukuda, Yuji; Kawahito, Daiki*; Kishimoto, Yasuaki*

no journal, , 

In order to examine energy distributions of ions, we performed a 3D PIC simulation concerning an interaction between the high power laser and H$$_{2}$$ cluster targets with a radius of 600 nm, at a laser intensity of 1.0$$times$$10$$^{22}$$ W/cm$$^{2}$$. The simulation results shows that in addition to symmetric electric fields by the Coulomb repulsive force, asymmetric sheath electric fields are generated due to electrons pushed forward by the Lorenz force, J$$times$$B. As a result, ions are accelerated forward up to 100 MeV by the anisotropic electric field of Coulomb explosion which consists of the symmetric electric fields and the asymmetric sheath fields. These results suggest that by using J-KAREN-P laser and submicron-size H$$_{2}$$ cluster targets, protons with energies of 100 MeV can be produced.

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