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Design and performance of the Focusing DIRC detector | | B.Dey
; M.Borsato
; N.Arnaud
; D.W.G.S.Leith
; K.Nishimura
; D.A.Roberts
; B.N.Ratcliff
; G.Varner
; J.Va'vra
; | | Date: |
1 Oct 2014 | | Abstract: | We present the final results from a novel Cherenkov imaging detector called
the Focusing DIRC (FDIRC). This detector was designed as a full-scale prototype
of the particle identification system for the SuperB experiment [1], and
comprises 1/12 of the SuperB barrel azimuthal coverage, with partial
photodetector and electronics implementation. The prototype was tested in the
SLAC Cosmic Ray Telescope which provided 3-D tracking of cosmic muons with an
angular resolution of ~1.5 mrad, a position resolution of 4-5 mm, a start time
resolution of 70 ps, and muon tracks above ~2 GeV tagged using an iron range
stack. The fused silica focusing photon camera was coupled to a full-size BaBar
DIRC bar box and was read out, over part of the full coverage, by 12 Hamamatsu
H8500 multi-anode photomultipliers (MaPMTs) providing 768 pixels. We used
waveform digitizing electronics to read out the MaPMTs. We give a detailed
description of our data analysis methods and point out limitations on the
present performance. We present results that demonstrate some basic performance
characteristics of this design, including: (a) single photon Cherenkov angle
resolutions with and without chromatic corrections, (b) signal-to-noise (S/N)
ratio between the Cherenkov peak and background, which primarily consists of
ambiguities of the possible photon paths from emission along the track to a
given pixel, (c) dTOP = TOP_measured - TOP_expected resolutions (with TOP being
the photon Time-of-Propagation in fused silica), and (d) performance of the
detector in the presence of high-rate backgrounds. | | Source: | arXiv, 1410.0075 | | Services: | Forum | Review | PDF | Favorites | |
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