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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Instrumentation 4

HK 12.5: Vortrag

Montag, 23. März 2015, 18:15–18:30, M/HS1

Development of large area diamond detectors for time of flight measurements of heavy ions — •Fabio Schirru¹, Chiara Nociforo¹, Mladen Kiš¹, Jochen Frühauf¹, Mircea Ciobanu², Michael Träger¹, and Robert Visinka¹ — ¹GSI, Darmstadt, Germany — ²ISS, Bucharest, Romania

The interest in using diamond for radiation detection applications stems from its unique properties. In particular, radiation hardness, low leakage current (no need of cooling), fast rise time of the induced signals (in the order of 100 ps) and high electron/hole saturation velocity (up to 10⁷ cm/s) make it an excellent candidate for serving as a high-resolution timing detector.

We present the Time of Flight (ToF) properties of new developed radiation detectors based on two 20x20 mm² and 0.3 mm thick polycrystalline diamonds. Electrodes were fabricated in house at GSI by depositing on both sides of the diamond samples Cr/Au layers of thickness 50/100 nm respectively.

Strip diamond detectors, irradiated with ¹⁹⁷Au beam at 1 GeV/u and coupled with integrated electronics, showed very good timing performances of ∼50 ps over a particle path of flight of ∼34 m. It is the first time that timing properties of diamond sensors are evaluated at experimental conditions very similar to those expected at the in-flight separator Super-FRS[1], under construction at FAIR.

- M. Winkler et al., Nucl. Instr. and Meth. B 266 (2008) 4183.