Ion beam preliminary testing of DECY-13 cyclotron at the central region using dc extraction voltage

The subsystem devices of the DECY-13 cyclotron have been installed except the RF-dee device, so a final ion beam testing has not been tested for cyclically accelerated ion beam or ion beam commissioning. An initial or preliminary test of the ion beam has been performed, for preparing the final beam test. The preliminary test was carried out by measuring ion beam current in the central region of the cyclotron. The extraction of the ion beam from ion source is done by pulling the ion beam using a DC voltage of a puller mounted on a center part of the dee. The test was carried out by observing the effect of the magnitude of the cathode voltage, magnetic field and the puller voltage on the beam current that caught in a beam probe placed at a distance of 3 mm from the puller. The results of the ion beam test show that the degree of influence from the strongest is successively from the components of puller voltage, cathode voltage and magnetic field. The obtained largest ion beam current was 126 μA at the parameters of 0.86 T magnetic field, cathode voltage of 1200 V, 50 mA cathode current, 5 sccm gas flow rate, final vacuum of 8 × 10−6 Torr and puller voltage of 2 kV. These results indicate that the initial ion beam current output qualifies for the steps toward the final test.