title: Analyses of the plasma generated by laser irradiation on sputtered target for determination of the thickness used for plasma generation.
abstract: In Brookhaven National Laboratory, laser ion source has been developed to provide heavy ion beams by using plasma generation with 1064 nm Nd:YAG laser irradiation onto solid targets. The laser energy is transferred to the target material and creates a crater on the surface. However, only the partial material can be turned into plasma state and the other portion is considered to be just vaporized. Since heat propagation in the target material requires more than typical laser irradiation period, which is typically several ns, only the certain depth of the layers may contribute to form the plasma. As a result, the depth is more than 500 nm because the base material Al ions were detected. On the other hand, the result of comparing each carbon thickness case suggests that the surface carbon layer is not contributed to generate plasma.
authors.affiliation: Cooperative Major in Nuclear Energy, Waseda University, Shinjuku, Tokyo, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Kumaki
authors.affiliation: RIKEN, Wako, Saitama, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Ikeda
authors.affiliation: RIKEN, Wako, Saitama, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Fuwa
authors.affiliation: American Nuclear Society, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: David
authors.initials: D
authors.lastname: Cinquegrani
authors.affiliation: RIKEN, Wako, Saitama, Japan.
authors.forename: Megumi
authors.initials: M
authors.lastname: Sekine
authors.affiliation: RIKEN, Wako, Saitama, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Munemoto
authors.affiliation: Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kanesue
authors.affiliation: Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Okamura
authors.affiliation: Cooperative Major in Nuclear Energy, Waseda University, Shinjuku, Tokyo, Japan.
authors.forename: Masakazu
authors.initials: M
authors.lastname: Washio