Detailed beam and plasma measurements on the vessel for extraction and source plasma analyses (VESPA) Penning H− ion source

A vessel for extraction and source plasma analyses (VESPA) is operational at the Rutherford Appleton Laboratory (RAL). This project supports and guides the overall ion sourceRD whereas the electron temperaturehas a slight linear decrease toward 2.2 eV. The gas density is 1021 m−3, whilst the electron density is two orders of magnitude lower. Densities follow square rootrelationships with arc current, with gas density decreasing whilst electron (and hence ion) density increases. Stopping and range of ions in matter calculations prove that operating a high curr...