In the Paul Scherrer Institute [PSI Switzerland] an experimental program was started to measure the ground state shift and width of pionic hydrogen. To calibrate the crystal spectrometer x-ray transitions in hydrogen-like heavy ions (e.g., Ar17+), produced by electron cyclotron resonance (ECR) ion sources, are necessary. In PSI a superconducting cyclotron trap magnet, originally developed for particle physics experiments, will be transformed into an ECR ion trap (ECRIT). The SC magnet can deliver more than 4 T magnetic fields with a mirror ratio of 2. A careful calculation showed this mirror ratio can be increased upto 10 and the trap can operate with frequencies between 5 and 20 GHz. To form a closed resonance zone an open structure NdFeB hexapole will be applied. The first tests will be performed at 6.4 GHz. Later higher frequencies and the two-frequency heating (6.4+ 10, 6.4+ 14.5, or 10+ 14.5 GHz) are planned to be applied to get enough quantity of H-like heavy ions. The ECRIT will operate at ground potential while a simple 90° beamline (at negative potential) will help the fine tuning of the plasma for very high charge states.
|Number of pages||3|
|Journal||Review of Scientific Instruments|
|Issue number||2 II|
|Publication status||Published - febr. 1 2000|
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