ION SOURCE RELATED RESEARCH WORK AT JYFL*

<p>In this article the work of the JYFL ion source group<br />will be presented. New bremsstrahlung measurements<br />were carried out in order to compare the results with<br />different electron heating models. Especially attention<br />was paid to study the effect of different heating<br />parameters on the evolution of bremsstrahlung energy. A<br />project to obtain new information about the ion<br />temperatures and their time evolution has been initiated.<br />The study will be performed using spectroscopic<br />techniques measuring the ion temperature from the<br />Doppler broadening of emission lines. The objective is to<br />obtain accurate information about the evolution and the<br />behaviour of highly charged ions in the ECRIS plasma.<br />The work of the JYFL ion source team also includes<br />frequency tuning experiments, beam quality experiments<br />and tests with a so-called collar structure mounted on the<br />plasma electrode. The beneficial effect of collar was first<br />tested and noticed with the ECR ion sources by the KVI<br />ion source group and has been shortly confirmed at JYFL.<br />The JYFL ion source group is also developing a low<br />power electron gun for the needs of spacecraft<br />applications. The results of the development work can<br />possibly be applied also with the ion sources in order to<br />increase the density of cold electrons.</p>IMP;Chinese Academy of Science