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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Instrumentation und Anwendungen II

HK 12.1: Gruppenbericht

Montag, 10. März 2008, 16:30–17:00, 2D

New FOPI MMRPC ToF Barrel — •Mladen Kiš for the FOPI collaboration — Gesellschaft für Schwerionenforschung, Darmstadt

FOPI’s Time-of-Flight Barrel was installed and successfully tested in a first production run in a NiNi experiment in September 2007. The Multi-strip Multi-gap Resistive Plate Counter (MMRPC) technology [1,2], developed and particularly designed to match the existing FOPI setup, has an improved Time-of-Flight resolution better than 100 ps for the complete system. This corresponds to a time resolution of the MMRPC Barrel better than 75 ps. As a consequence the charged kaon identification within FOPI is now enhanced up to a p_lab ≤ 1 GeV/c. With this successfull upgrade, FOPI is the first among setups of similar size and granularity which demonstrates excellent timing resolution in a running experiment.

The FOPI MMRPC Barrel covers about 6 m² and comprises 4160 electronic channels. It is built of 26 so-called Super Modules (SM). Each SM contains five MMRPC detectors segmented into 16 strips. A single detector time resolution is better than 55 ps. We will discuss the performance of the MMRPC Barrel alone and within the FOPI environment.

[1] E.C.Zeballos et al., Nucl. Inst. and Meth. A 374 (1996), 132.

[2] A. Schüttauf et al., Nucl. Phys. B (Proc. Supp.) 158 (2006) 52.