Status report of the JYFL-ECR ion sources

J. Arje, H. Leinonen, R. Seppala, J. Hyvonen, E. Liukkonen, P. Heikkinen, V. Nieminen, K. Ranttila, V. Hanninen, A. Lassila, and J. Pakarinen
Accelerator Laboratory, University of Jyvaskyla, Survontie 9, PB35, FIN-40351 Finland

H. Koivisto
Michigan State University, National Superconducting Cyclotron Laboratory, East Lansing, MI 48824-1321, U.S.A

Z.Q. Xie
Berkeley Ion Equipment, Inc., 3400 De La Cruz Blvd. V, Santa Clara, CA 95054, USA

"Ion beam cocktails" are mixtures of ions with near-identical charge-to-mass ratios. In conjunction with the JYFL-ECRIS, the K130-cyclotron acts as a mass analyzer: the switch from one ion to another within the same cocktail is simple and fast. In the case of the first ion beam cocktail, the oxygen and argon gases were mixed into the gas feed line. At the same time the magnesium and iron ion beams were produced using the MIVOC method. Magnesocene and ferrocene compounds were both mixed into the MIVOC chamber. This capability is especially useful in the study of single event effects (SEE) in space electronics. All gaseous elements from H to Xe can be produced. The non-gaseous elements produced so far are C, Mg, Al, Si, S, Ca, Ti, Cr, Fe, Co, Ni, Cu, Zn and Ge.

A major technical modification since the construction (in 1990) of the JYFL-ECRIS was made in January 98: a negatively biased disc replaces now the first plasma stage. After a couple of months experience with the modified source the change was found to be towards a correct direction. The source is now much easier to use and the good operating conditions are well repeated. A real advantage is the new magnetic field settings which are practically the same for all kind of beams, gaseous and solids.

Due to the requirements of ion beams with higher charges and heavier elements than the present JYFL-ECRIS can produce, JYFL decided to begin a design and construction project of a new ECR ion source, called as ECRIS 2. The project aims to a source that is based mainly on the design of the 14 GHz AECR-U source at the LBNL. Some modifications made into the similar source under construction at the NSCL/MSU will be utilized here. The new source will be installed horizontally in the basement of the ECRIS laboratory. It requires a new beam-line from the source to the cyclotron injection line, since the old vertically located JYFL-ECRIS will be preserved in operation. The new source is planned to be operational during the year 2000.

Presenting Author : Arje J.
Presentation : Poster
Tuesday Poster Session at 16:00