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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.

Oral presentation

Formation of an anisotropic electric field and longitudinal acceleration of 100-MeV protons triggered by intense laser irradiation of submicron-size H$$_{2}$$ cluster media

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

no journal, , 

In order to examine energy distributions of ions, by using the particle based integrated code, EPIC3D, we performed a 3D numerical simulation concerning an interaction between the high power laser and cluster media, where submicron-size H$$_{2}$$ cluster is embedded in a background H$$_{2}$$ gas 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 approximately 100 MeV by the anisotropic electric field of Coulomb explosion which is the superposition of the symmetric electric field and the asymmetric sheath field.

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 the recent experiment concerning high power laser-cluster interaction, composed of CO$$_{2}$$ clusters and background hydrogen gas, conducted at JAEA-KPSI, high energy background hydrogen ions, accelerated up to 1.6 MeV, have been observed. In order to examine the acceleration mechanism of the background gas ions, we have performed 2D and 3D PIC simulations in the parameter regime relevant to the experiment. The simulation results shows that at the contact surface area, the asymmetric electric field of Coulomb explosion from cluster and the additional electric field from background gas are generated and these electric fields contribute to the acceleration of background gas ions. From energy spectra of ions, the simulation results well support experimental ones.

Oral presentation

Simulation studies on the structure formation of fields and ion acceleration due to the interaction between high power lasers and clustered media

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

no journal, , 

In the experiment concerning ion acceleration, composed of CO$$_{2}$$ clusters and background hydrogen gas, conducted at JAEA-KPSI, high energy background hydrogen ions, accelerated up to 1.6 MeV, have been observed. In order to examine the structure dynamics of fields which trigger to the acceleration of background gas ions, we have carried out a series of 2D and 3D numerical simulations using the particle based integrated code, EPIC3D, in the parameter regime relevant to the experiments. The simulation results shows that at the contact surface area, the asymmetric electric field of Coulomb explosion from cluster and the additional electric field from background gas are generated and these electric fields contribute to the acceleration of background gas ions. From energy spectra of ions, the simulation results well support experimental ones.

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