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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.4: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

New developments on a parallel-plate avalanche counter (PPAC) for low-energy radioactive ions — •M. Pantea1, W. Carli2, R. Lutter2, O. Kester2, G. Schrieder1, H. Simon3, and P. Thirolf21Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany — 2Maier-Leibnitz-Laboratorium, LMU München, D-85748 Garching, Germany — 3Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany

At REX-ISOLDE [1], an especially thin (< 1 mg/cm2) position sensitive parallel-plate avalanche counter (PPAC) is used to optimise the beam on the MINIBALL [2] experimental targets. This PPAC can be put close to the target without stopping the radioactive beam, and so producing any radioactive background in the close MINIBALL gamma array. Recently, developments concerning the gas supply and the readout electronics have been achieved. A gas control system has been designed that allows for a safe handling of the delicate PPAC while accessing the experimental area. The gas flow and pressure (about 5 mbar) in the PPAC are regulated automatically. The detector can be used in signle-particle and current readout mode. The sensitivity of the current readout electronics has been improved, and presently from up to 108 to down to about 103 particles per second can be detected. This allows for the PPAC to be used for low-intensity radioactive beam tuning. Latest test results concerning the resolution and sensitivity of the PPAC will be presented.
Supported by BMBF 06 DA 115.

[1] D. Habs et al., Nucl. Phys. A 616, 29c (1997)

[2] J. Eberth et al., Prog. Part. Nucl. Phys. 46, 389 (2001)

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