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HK: Hadronen und Kerne
HK 56: Postersitzung
HK 56.47: Poster
Mittwoch, 18. März 1998, 17:00–19:00, Foyer
A Fast Ionisation Chamber for the Identification of Relativistic Heavy Ions — •A. Stolz, T. Faestermann, H.-J. Körner, R. Schneider, and E. Wefers — Technische Universit"at M"unchen
At the GSI in Darmstadt a substantial increase of beam intensities is expected for 1998. This is especially useful for the exploration of exotic nuclei produced by projectile fragmentation, where low production rates are the limiting factor. In our experiments the fragments are separated by the magnet spectrometer FRS and identified by detectors located in its focal planes. To make use of the higher beam currents, an ionisation chamber for measuring energy loss and position of the ions has been developed. It can accept rates up to 105 ions per second. A further goal was to get a compact setup which fits into the limited space at the mid focal plane of the FRS.
By reducing the space needed for field homogenization and by using the very fast and dense CF4 gas, the total length could be limited to 22cm, while still obtaining Z-resolution for Z=50 isotopes. The position resolution in X direction was realized with a 3 fold segmented backgammon anode and the Y resolution by a drift time measurement. The high rate capability was realized by 3 fold segmentation of the anodes, a small drift gap of 4cm, and the fast detector gas (v=12cm/µs). The total active area of the detector is 20*4cm2.
Results from a test measurement will be presented.