Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Instrumentation
HK 27.7: Vortrag
Mittwoch, 21. März 2012, 15:45–16:00, P 3
Diamonds are not forever - scCVD radiation damage study with high intensity Au beam in HADES — •Jerzy Pietraszko1 and Wolfgang Koenig2 — 1Goethe-Universität, Frankfurt — 2GSI Helmholtzzentum für Schwerionenforschung GmbH, Darmstadt
Since more than 10 years the HADES group has been involved in the development of diamond detectors based on pcCVD material. These detectors showed very good performance (time resolution below 100 ps sigma) and stable long term operation (over several weeks) at moderate beam (12C) intensities about 105 particles/s/cm2. With the recently finished upgrade of the HADES spectrometer, aimed at preparing for experiments at SIS-100 at the future FAIR facility, the DAQ performance was significantly increased allowing for high intensity beams. The upcoming Au+Au experiment, scheduled for 2012, will utilize an Au beam at intensities between 2-5*106 Au ions/s. Due to the requested very small target diameter, 2.2 mm, the HADES beam focus system has to provide a beam spot below 2mm2 in the HADES focal point. During a recently conducted five day long test experiment at this beam intensity we have reached a total particle dose close to 2.37 * 1013 Au ions/cm2 on our diamond start detector which was never archived before. By analysing the surface of the detector and properties like signal amplitude and time resolution we have identified significant radiation damage. In this talk the observed effects will be discussed. *This work has been supported by BMBF (06 FY 9100 I), HIC for FAIR, EMMI and GSI