Authors: A Lorusso M V Siciliano L Velardi V Nassisi
Publish Date: 2010/06/09
Volume: 101, Issue: 1, Pages: 179-183
Abstract
We developed an ion accelerator with a double accelerating gap system supplied by two power generators of different polarity The ions were generated by laser ion source technique The laser plasma induced by an excimer KrF laser freely expanded before the action of accelerating fields After the first gap action the ions were again accelerated by a second gap The total acceleration can imprint a maximum ion energy up to 160 keV per charge state We analysed the extracted charge from a Cu target as a function of the accelerating voltage at laser energy of 9 11 and 17 mJ deposited on a spot of 0005 cm2 The peak of current density was 39 and 53 mA for the lower and medium laser energy at 60 kV At the highest laser energy the maximum output current was 117 mA with an accelerating voltage of 50 kV The maximum ion dose was estimated to be 1012 ions/cm2 Under the condition of 60 kV accelerating voltage and 53 mA output current the normalized emittance of the beam measured by pepper pot method was 022 π mm mrad
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