P. Fonte, A. Smirnitski, and C. Williams
"A New High-Resolution Time-OF-Flight Technology"
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In the framework of the ALICE Collaboration, we have recently studied
the performance of the multigap Resistive Plate Chambers, which were
operated in avalanche mode and at atmospheric pressure for
Time-Of-Flight measurements. The detector provided an overall
(detector plus electronics) timing accuracy of 120 ps sigma at an
efficiency of 98% for MIP's. The chambers had four 0.3mm gas gaps,
limited by both a metallised ceramic plate and a glass plate, with an
active dimension of 4x4cm2 .
The gas mixture contained C2H2F4
+5%isobutane+10%SF6 . The streamer discharges, at a rate level of a
few percent, each releasing about 20pC, were tolerated without any
noticeable problem. This detector opens the perspectives for
affordable and reliable, high-granularity large area TOF detectors,
with efficiency and time resolution comparable to existing
scintillator-based TOF technology, but with significantly, up to an
order of magnitude, a lower price per channel.
Last modified: 7 April 1999,