Abstract
Laser-generated non-equilibrium plasmas were analyzed at Brookhaven National Laboratory (NY, USA) and MIFT Messina University (Italy). Two laser intensities of 1012 W/cm2 and 109 W/cm2, have been employed to irradiate Al and Al with Au coating targets in high vacuum conditions. Ion energy distributions were obtained using electrostatic analyzers coupled with ion collectors. Time of flight measurements were performed by changing the laser irradiation conditions. The study was carried out to provide optimum keV ions injection into post acceleration systems. Possible applications will be presented.
Highlights
In order to produce high energy particles, traditional accelerators or high intensity lasers can be used
The reported data indicate that using a laser intensity of about 2.3 1012 W/cm2 irradiating pure Al the plasma temperature is under 1 keV
Considering the results obtained about the charging states in the two different laboratories using two different laser intensities, we can state that at a laser intensity of 2.3 ́1012 W/cm2 it is possible to obtain higher charging states, for aluminium from 1+ to 8+ whereas for Au from 1+ to 12+, while at lower intensity the maximum charge states for both species are 3, but with more energy constants than for the high intensity
Summary
In order to produce high energy particles, traditional accelerators or high intensity lasers can be used. The most diffused regime to induce high ion acceleration, using sub-nanosecond laser pulses interacting with thin foils, it’s known as Target Normal Sheath Acceleration (TNSA), in which the plasma is produced mainly in forward direction with high energy ions above 1 MeV per charge state [2]. Another acceleration regime is the Backward Plasma Acceleration (BPA), that generally occurs during the interaction with thick targets with low intensity lasers (109-13 W/cm2) generating high ion yields and low energetic ions, of the order of 1-10 keV per charge state [3]. The interest for these plasmas comes for LIS applications in accelerator systems, such as the superconducting cyclotrons, and radio frequency quadrupole (RFQ) accelerator in which the laser-plasma produced ions can be injected
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