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INSTRUMENTS-METHODS-17 Electronic gain dependence of the time resolution for FOPIs Multi-strip Multi-gap Resistive Plate Counters (MMRPCs)

By A. Schüttauf, K. D. Hildenbr, M. Ciobanu, P. Koczon, Y. J. Kim, M. Kis, Y. Leifels and M. Marquardt

Abstract

In order to improve the Kaon identification up to 1 GeV/c the FOPI detector will be upgraded by an array of 150 Multi-strip MRPCs [1][2]. This requires a time resolution σt ≤ 100 ps for single and double-hits in the counters [3][4]. The counter design is finalized (cf. Fig. 1): active area 46 x 900 mm 2, 8 gaps of 220 µm, 16 separate anode strips, operation voltage 9 to 10 kV; a gas mixture Freon/i-But/SF6 (85/5/10)is used. The mass production has started, the system shall be operational by the end of 2006. the detector response is similar for the various gain settings, a higher gain leads to a shift of the curves to lower fields. At given field a higher gain provides a better resolution, likewise at given gain a certain resolution is reached at a lower field strength. For example we reach at G ∼ 77 a time resolution of σt ≤75 ps at E ≥ 120 kV/cm; at G ∼ 220 a resolution σt ≤ 50 ps is reached at E ≥ 108 kV/cm already. Similarly the detector becomes fully efficient at lower electric fields when the gain is higher

Year: 2010
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