Performance of the CAPRICE98 Balloon Borne Gas-RICH Detector

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Copyright: 2016
Pages: 24
Source title: Position-Sensitive Gaseous Photomultipliers: Research and Applications
Source Author(s)/Editor(s): Tom Francke (Myon, Sweden)and Vladimir Peskov (CERN, Switzerland)
DOI: 10.4018/978-1-5225-0242-5.ch013

Keywords: Computer Science & IT / Engineering Science / Engineering Science Reference / Sensor Technologies

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Abstract

A RICH detector using a gas radiator of C4F10 and a photosensitive MWPC with pad readout has been developed, tested in particle beams at CERN and used in the CAPRICE98 balloon borne experiment. The MWPC was operated with a TMAE and ethane mixture at atmospheric pressure and used a cathode pad plane to give an unambiguous image of the Cherenkov light. The induced signals in the pad plane were read out using the AMPLEX chip and CRAMS. The good efficiency of the Cherenkov light collection, the efficient detection of the weak signal from single UV photons together with a low noise level in the electronics of the RICH detector, resulted in a large number of detected photoelectrons per event. For ß~ 1 charge one particles, an average of 12 photoelectrons per event were detected. The reconstructed Cherenkov angle of 50 mrad for a ß ~ 1 particle had a resolution of 1.2 mrad (r.m.s). The RICH was flown with the CAPRICE98 magnetic spectrometer and was the first RICH detector ever used in a balloon borne experiment capable of identifying charge one particles at energies above 5 GeV. The RICH provided an identification of cosmic ray antiprotons up to the highest energies ever studied (about 50 GeV of total energy). The spectrometer was flown on 28–29 May 1998 from Ft Sumner, New Mexico, USA.

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Performance of the CAPRICE98 Balloon Borne Gas-RICH Detector

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