Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Instrumentierung II
HK 13.10: Vortrag
Montag, 21. März 2011, 19:00–19:15, HS1
Large area beam tracking with high timing resolution for HISPEC/DESPEC at FAIR — •Michael Pfeiffer, Gheorghe Pascovici, Nigel Warr, Stefan Thiel, and Jan Jolie — IKP, Universität zu Köln
A prototype of a new beam profile monitor with tracking and TOF capabilities for degraded beams at HISPEC/DESPEC at FAIR has been built at the Institute of Nuclear Physics at the University of Cologne. The device constists of two detectors in series, each with an active area of 80x100mm 2. The working principle is based on secondary electrons being created by the ions passing through a thin sheet of material. Afterwards they are accelerated and deflected out of the projected ion beam path by an electrostatic top-assembly. The final sub-assembled electron-detector consists of a chevron MCP-stack giving a fast timing signal and a position-sensitive dual delay line. The parameters we investigated using a highly modular test-bed are: the spatial resolution, the timing resolution and the tracking capabilities. The absolute position resolution and the ratio between position dependent resolutions on vertical and horizontal axis have been investigated vs. mesh characteristics, accelerating and deflection potentials, the beam position and its trajectory. Further analysis of the position dependency of the spatial resolution due to the spread of secondary electrons are under investigation. Concerning the TOF resolution we achieved ≈ 210 ps with a highly divergent alpha beam from a coated 241Am source. Simulations showed the intrinsic resolution to be better. First results and conclusions will be presented.