Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 39: Halbleiter 2

T 39.4: Talk

Monday, March 24, 2014, 17:30–17:45, P109a

Sapphire detectors — •Olena Karacheban¹, Sergej Schuwalow², Alexandr Ignatenko², Wolfgang Lohmann¹, Wolfgang Lange¹, and Itamar Levy³ — ¹DESY, Zeuthen, Germany — ²DESY, Hamburg, Germany — ³Tel Aviv University, Tel Aviv, Israel

For experiments at accelerators beam halo and beam loss monitoring is essential to optimise the operation of the accelerator and to ensure high quality data. Sensors used for such monitors, usually installed near or inside the beam-pipe, are exposed to high radiation dose. So far ionisation chambers and diamond sensors are used. They are robust and tolerate high dose. However, ionisation chambers are slow, and diamond sensors limited in size and expensive. Single crystal sapphire sensors are considered as a promising alternative. The are available as large wafers and are less expensive. Results are presented on the charge collection efficiency of sapphire sensors and on their performance as a function of the absorbed dose. Currently, for a beam-loss monitor at FLASH sapphire sensors are applied, and a system for XFEL is proposed. A detector with directional sensitivity is designed using a stack of sapphire sensors. Results from measurements in a test-beam are reported.