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6.4 GHz ECRIS ion source unit


Name and Model (Year of Manufacture / Installation)

6.4 GHz ECRIS, self-made (1991/1991); upgraded 2001-2002; a new plasma chamber added 2005

General Information

6.4 GHz ECR (=Electron Cyclotron Resonance) ion source unit (including extraction system and the mass separator) for heavy ions.

Key Specifications        

Volume of plasma chamber          

7.7 litres

Plasma volume

0.68 litres

Microwave frequency

6.4 GHz

Max. microwave power

400 W

Max. acceleration voltage

15 kV

Base vacuum

< 10-7 mbar


0.23 T


1.2 T


0.6 T


0.5 T (MMPS 0.9 T)


0.16 T

Key Features

The JYFL 6.4 GHz ECRIS was completed in 1991 for the nuclear physics program at the Department of Physics, University of Jyväskylä. The ion source is similar to the 6.4 GHz RT-ECRIS at the National Superconducting Cyclotron Laboratory, Michigan State University (NSCL/MSU). The ECRIS research and development work was strongly limited due to the effective use of the JYFL 6.4 GHz ECRIS for its main purpose – delivering ion beams for the nuclear physics experiments.

Source was upgraded during 2001 and 2002. A remarkable improvement to its performance was obtained.

A new Modified MultiPole Structure (JYFL-MMPS) was installed in January 2005. The new plasma chamber is made of aluminum (previous: copper), cooling system was improved to handle more than 1 kW microwave power and the magnetic field strength improved from 0.4 T to 0.5 T. With the iron poles the magnetic field can be boosted up to 0.9 T at the locations where the plasma flux hits the chamber walls, i.e. at the magnetic poles of the hexapole structure.

Location, Contact Person

Department of Physics, YS 112 / Hannu Koivisto