Experimental studies on the gas mixing effect on DECRIS-14-2

The gas mixing effect has been studied experimentally. A set of experiments were performed on DECRIS-14-2 with the first stage, negatively biased electrode (no first stage), and the first stage together with negatively biased potential. Different support gases (helium, oxygen, neon) were tested to the different main gases (oxygen, argon, xenon). The main gas consumption and the mixing ratios were measured for the corresponding experiments. The experiments indicate that the gas mixing effect is restrained by the negatively biased potential compared with the first stage. The main gas consumption is decreased by more than 60% due to the gas mixing effect. By means of the gas mixing effect, the beam intensity of the typically optimized ions (O6+, Ar11+ and Xe18+) are improved averagely by more than 1.3 times with the negatively biased electrode and more than 1.5 times with the first stage. 4 refs., 6 figs., 1 tab