Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 56: Postersitzung

HK 56.19: Poster

Mittwoch, 18. März 1998, 17:00–19:00, Foyer

Charged and Neutral Polarized Hydrogen Beams from the New Stern-Gerlach Type Ion Source for the Munich Tandem Accelerator — •R. Hertenberger, N. Eckmann, Y. Eisermann, A. Hofmann, A. Metz, P. Schiemenz, and G. Graw — Sektion Physik der Universität München, D-85748 Garching

The new Stern-Gerlach polarized ion source for the Munich 14 MV tandem accelerator provides a beam intensity of 6.4*10¹⁶ neutral polarised H₁^→ atoms / sec at the entrance of the ECR ionizer (10 mm in diameter). This is equivalent to 10 particle-mA before ionisation. A two-step charge exchange unit, an electron cyclotron resonance ionizer (ECR) followed by a cesium gas target, seems to be well suited for the preparation of negative hydrogen beams of high brilliance: A positive polarized beam is extracted from the electron cyclotron resonance ionizer (ECR) and accelerated to about 500 eV per nucleon. The pick-up of two electrons in a cesium gas target of 10¹⁵ atoms per cm² has at this energy a probability of up to 30 %. We report on the performance of neutral and charged H and D beams with emphasis on the efficiency of the ECR ionizer, on measurements of degree of dissociation, and on beam diagnostics.

Supported by the BMBF under contract 06LM363, the DFG under contract IIC4-Gr894/2-1 and the Beschleunigerlabor der LMU und TUM.