Speaker
Dr
Yuji Fukuda
(Japan Atomic Energy Agency)
Description
In order to understand the synergetic interplay between the Coulomb explosion of clusters and the background gas dynamics, an energy spectrum of carbon/oxygen ions from the CO_2 clusters and that of protons from the background hydrogen gas are measured separately at 1×10^19 W/cm^2 with a careful analysis of etch pit structures on CR-39. The maximum energies of carbon/oxygen ions and protons are determined as 1.1 MeV/u and 1.6 MeV, respectively. The structure of electric field and dynamics of contact surface due to the interaction between cluster and background gas are analyzed with help from 2D-PIC simulations. The phenomenon is suggested to have a similarity to a structure formation process in Supernova remnants.
Moreover, we present a development of submicron-size hydrogen cluster targets using a cryogenic conical nozzle and their characterization with the Mie scattering method. Above 10^22 W/cm^2, achievable soon with the coming PW laser facilities, the anisotropic Coulomb explosion of submicron-size hydrogen clusters could produce directional proton beams with energies of several tens of MeV, quite advantageous to the future applications, since they are inherently impurity-free, high rep.rate, and robust.
Primary author
Dr
Yuji Fukuda
(Japan Atomic Energy Agency)
Co-authors
Mr
Aaron Alonso
(Queen’s University Belfast)
Dr
Alexander Pirozhkov
(Japan Atomic Energy Institute)
Prof.
Anatoly Faenov
(Osaka University)
Mr
Ashley Smyth
(Queen’s University Belfast)
Mrs
Clare Scullion
(Queen's University Belfast)
Dr
Domenico Doria
(Queen's University of Belfast)
Dr
Hiromitsu Kiriyama
(Japan Atomic Energy Agency)
Dr
Hironao Sakaki
(Japan Atomic Energy Agency)
Prof.
Keiji Oda
(Kobe University)
Dr
Kiminori Kondo
(Japan Atomic Energy Agency)
Dr
Mamiko Nishiuchi
(Japan Atomic energy Agency)
Prof.
Marco Borghesi
(Queen's University Belfast)
Dr
Masaki Kando
(Japan Atomic Energy Agency)
Dr
Masato Kanasaki
(Japan Atomic Energy Agency)
Mr
Ryutaro Matsui
(Kyoto University)
Dr
Satoshi Jinno
(The University of Tokyo)
Dr
Tatiana Pikuz
(Osaka University)
Prof.
Tomoya Yamauchi
(Kobe University)
Prof.
Yasuaki Kishimoto
(Kyoto University)
