Mainz 2004 – wissenschaftliches Programm

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T: Teilchenphysik

T 401: Halbleiterdetektoren V

T 401.5: Vortrag

Mittwoch, 31. März 2004, 15:10–15:25, RW 3

Radio Frequency Test for the HERMES Recoil Detector — •Ye Zhenyu, Prahl Volker, and Stewart James — DESY-Hamburg, Notkestrasse 85, Hamburg

HERMES is a fixed target experiment at the HERA positron beam in DESY, Hamburg to study the spin structure of the nucleons. A new silicon strip detector, as a part of the recoil detector, was proposed and is being constructed to detect recoil protons in order to study Deeply Virtual Compton Scattering in a future running period. To measure the low-energy recoil protons, the silicon detector is placed directly inside the HERA vacuum chamber to minimize the material between the interaction point and the detector. Consequently, the electromagnetic field generated by the bunched HERA positron beam will be coupled directly to the silicon detector. To make sure that the silicon detector will work properly with the HERA RF field, a RF test was done by using a wire stretched along the trajectory of the beam through the test structure to simulate the HERA generated field. Special care was devoted to impedance matching in order to get a not too weak field as compared to real conditions. Measurements were done both in the frequency domain and in the time domain. The influence of the wire-simulated fields to the silicon detector are investigated and the effects are scaled up to real condition.