München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 32: Instrumentation und Anwendungen

HK 32.3: Vortrag

Mittwoch, 22. März 2006, 14:45–15:00, H

Absolute Energy Calibration and Time Resolution Measurements of the ANKE Silicon Tracking Telescopes. — •Vladimir Leontyev — FZ-Jülich, Jülich, Germany

The ANKE Silicon Tracking Telescopes have to determine an absolute particle energy with about 1% accuracy. A calibration by α-sources allows to achieve that accuracy, if the dead layer thickness and structure of the detector have been measured. One method, using α-particles of two different energies will be presented. A combination of ²³⁹Pu and ²⁴⁴Cm as α-sources can be applied to realize the absolute calibration in the laboratory. It is planned to use an α-source as a permanent monitor for the telescope performance.

The time resolution of silicon detectors was investigated with two types of preamplifier, chips VA32TA2 (ideas, Norway) and MATE3 (Saclay, France). Laboratory measurements were carried out with α- and β- sources under vacuum and in air. It allowed to investigate the trigger time and resolution dependence on magnitude and spatial distribution of the charge. The results of α- and β-measurements were cross-checked in the overlapping energy region.

The Cologne Tandem-Accelerator provides a proton beam of precise energy, which allows to study the functioning of the detector with different particle ranges. In addition, it becomes possible to provide a direct Time-of-Flight measurement with two detectors of the telescope. Thus, the planned measurements at the accelerator will check the results of the energy and time investigations in an independent way.