title: Measurements of the highest acceleration gradient for ions produced with a long laser pulse.
abstract: Ultrafast plasma light ion streams have been produced using the 300 ps, kJ-class iodine laser, operating at PALS Centre in Prague. Ion detection was performed through standard ion collectors (IC) in time-of-flight configuration (TOF), shielded by thin metallic absorbers. This new diagnostics technique has been theoretically studied and experimentally tested in order to cut the long photopeak contribution and to analyze the ultrafast particle signal. Processing the obtained experimental IC-TOF data, including deconvolution processes of the TOF signals, UV/soft-x-ray photopeak absorption, and ion transmission calculations for different metallic filters, is shown. Mainly amorphous carbon (graphite) targets have been irradiated in order to limit the maximum number of ion charge states and to focus our study on demonstrating the validity of the proposed investigation technique. Maximum ion energy and acceleration gradient estimations as a function of the laser energy and focal spot diameter are reported.
authors.affiliation: Institute of Physics, ASCR, v.v.i., PALS Centre, Prague 18221, Czech Republic. margaron@fzu.cz
authors.forename: D
authors.initials: D
authors.lastname: Margarone
authors.forename: J
authors.initials: J
authors.lastname: Krasa
authors.forename: L
authors.initials: L
authors.lastname: Laska
authors.forename: A
authors.initials: A
authors.lastname: Velyhan
authors.forename: T
authors.initials: T
authors.lastname: Mocek
authors.forename: J
authors.initials: J
authors.lastname: Prokupek
authors.forename: E
authors.initials: E
authors.lastname: Krousky
authors.forename: M
authors.initials: M
authors.lastname: Pfeifer
authors.forename: S
authors.initials: S
authors.lastname: Gammino
authors.forename: L
authors.initials: L
authors.lastname: Torrisi
authors.forename: J
authors.initials: J
authors.lastname: Ullschmied
authors.forename: B
authors.initials: B
authors.lastname: Rus