CYCLOTRONS 2010 - List of Authors (Kommpula, J.P.)

Paper	Title	Page
MOPCP049	Ion Source Related Research Work at JYFL	150
	H. A. Koivisto, V.P. Aho, J.E. Ärje, T. Kalvas, J.A. Kauppinen, J.P. Kommpula, T. Ropponen, O.A. Tarvainen, V.A. Toivanen JYFL, Jyväskylä, Finland
	In this article the work of the JYFL ion source group will be presented. New bremsstrahlung measurements were carried out in order to compare the results with different electron heating models, especially defining the endpoint energy of the bremsstrahlung spectra. A project to obtain new information about the ion temperatures and their time evolution has been initiated. The study will be performed using spectroscopic techniques measuring the ion temperature through the Doppler broadening of emission lines. The objective is to reveal accurate information about the time evolution of highly charged ions in the ECRIS plasma. The work also includes frequency tuning experiments, beam quality experiments and tests with a so-called collar structure. The beneficial effect of collar was first tested and noticed with the ECR ion sources by the KVI ion source group and has been shortly confirmed at JYFL in collaboration with the KVI research group. The JYFL ion source group is also developing a low energy electron gun for the spacecraft applications. The results of the development work can possibly be applied also with the ion sources in order to increase the density of cold electrons.

Paper

Title

Page

Ion Source Related Research Work at JYFL

150

H. A. Koivisto, V.P. Aho, J.E. Ärje, T. Kalvas, J.A. Kauppinen, J.P. Kommpula, T. Ropponen, O.A. Tarvainen, V.A. Toivanen
JYFL, Jyväskylä, Finland

In this article the work of the JYFL ion source group will be presented. New bremsstrahlung measurements were carried out in order to compare the results with different electron heating models, especially defining the endpoint energy of the bremsstrahlung spectra. A project to obtain new information about the ion temperatures and their time evolution has been initiated. The study will be performed using spectroscopic techniques measuring the ion temperature through the Doppler broadening of emission lines. The objective is to reveal accurate information about the time evolution of highly charged ions in the ECRIS plasma. The work also includes frequency tuning experiments, beam quality experiments and tests with a so-called collar structure. The beneficial effect of collar was first tested and noticed with the ECR ion sources by the KVI ion source group and has been shortly confirmed at JYFL in collaboration with the KVI research group. The JYFL ion source group is also developing a low energy electron gun for the spacecraft applications. The results of the development work can possibly be applied also with the ion sources in order to increase the density of cold electrons.