GLAS-PPE/95-04

¹⁾Dept. of Physics & Astronomy, University of Glasgow, UK ²⁾Dept. of Physics, University of Lancaster, UK ³⁾Dept. of Physics, University of Sheffield, UK ⁴⁾Dip. di Fisica, Università di Udine, Italy ⁵⁾L.E.P.S.I., Strasbourg, France

On Behalf of the RD8 Collaboration

Abstract:

A gallium arsenide detector was tested with a beam of 70GeV pions at the SPS at CERN. The detector utilises a novel biasing scheme which has been shown to behave as expected. The detector has a pitch of 50 m and therefore an expected resolution of 14.5 m. The measured resolution was approximately 14 m. By using a non-linear charge division algorithm this can be increased to 12 m. Noise was the limiting factor to the resolution. This was 2000e^- as opposed to the expected 360e^-. This noise is also thought to have reduced the detection efficiency of the detector. The source of the excess noise is currently being investigated.

Presented by S.J. Gowdy at the
4^th workshop on GaAs detectors and related compounds
San Miniato (Italy) 19-21 March 1995

• Introduction
• Testbeam Setup
• Detector Structure
• Detector Characteristics
• Off-line Analysis
• Results
• Simulation
• Conclusion and Further Work
• Acknowledgements
• References
• About this document ...