Abstract
The Front Surface Acceleration (FSA) obtained in Laser Ion Source (LIS) systems is one of the most interesting methods to produce accelerated protons and ions. We implemented a LIS to study the electric field responsible for the ion acceleration mechanisms. A high impedance resistive probe was used to map the electric potential inside the chamber, near the target. We detected the time resolved profiles of the electric potential moving the probe from 4.7cm to 6.2cm with respect to the main target axis. The corresponding electric field depends on the distance x as 1/xα with α∼1.8. We suggest that the electric field strength stems from the contribution of an electrostatic and an induced field.
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