Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.72: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

Single Crystal CVD Diamond Particle Detectors for Hadron Physics Experiments — •Michal Pomorski, Eleni Berdermann, Mircea Ciobanu, Alexander Martemyianov, Peter Moritz, and Bernd Voss — Gesellschaft für Schwerionenforschung, Darmstadt, Germany

Due to its remarkable physical properties Single-Crystal CVD diamond is one of the most promising wide band-gap materials for particle detection in present and future hadron physics experiments, where radiation hardness and speed is the crucial requirement. First results from a Single-Crystal CVD diamond detector are reported, which is under development for heavy-ion particle identification and minimum-ionizing particles timing as well. The charge-collection efficiency is about 100 % , never obtained from poly-crystalline CVD-diamond detectors. An energy resolution of 20 keV (Δ E/E ≈ 0.0035 ) is achieved using mixed nuclide α -sources, which is comparable to the energy resolution of silicon detectors. Using low impedance broadband electronics and a ToF technique, where holes or electrons drift separately inside the diamond bulk, the saturation velocity, mobility and lifetime of both charge carriers are estimated. The influence of the electric field on both, the material parameters and the signal shape is discussed regarding the timing properties of the detectors.

Supported by the 6th European Frame Program (FP6, I3 Hadron Physics, JRA NoRHDia)