Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1682955 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2011 | 5 Pages |
Abstract
In this work, we present the experimental results of a laser ion source (LIS) implemented for ion accelerators. A KrF excimer laser beam operating at 248Â nm was focused on a solid target mounted inside a vacuum chamber in order to obtain the plasma. The laser energy was fixed at 11.5Â mJ/pulse. The ion components of the plasma were extracted and accelerated up to 160Â keV per charge state by a double gap system formed in two different stages. The beam cross section was circular, 1.5Â cm in diameter. Using Cu and Y disks, as laser targets, we produced ion beams containing 1.2Â ÃÂ 1011 ions/pulse (0.7Â ÃÂ 1011 ions/cm2). Applying a total accelerating voltage of 60Â kV we obtained an increase in ion dose up to 3.4Â ÃÂ 1011 ions/pulse, (2Â ÃÂ 1011 ions/cm2) for the Cu target and up to 6.3Â ÃÂ 1011 ions/pulse (3.5Â ÃÂ 1011 ions/cm2) for the Y target. The characterization of the plasma was performed using a Faraday cup for the electromagnetic properties, and a pepper pot system for the geometric ones. At 60Â kV accelerating voltage and 5.5Â mA output current the normalized beam emittance resulted in 0.22Â ÏÂ mm mrad for the Cu target, while under the same accelerating voltage, but with 7.4Â mA output current, the normalized beam emittance resulted in 0.14Â ÏÂ mm mrad for the Y target.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
V. Nassisi, M.V. Siciliano,