Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Poster Session: Instrumentation and Applications
HK 12.4: Poster
Dienstag, 9. März 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. Thirolf2 — 1Institut 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)