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The focusing DIRC: An innovative PID detector

Abstract : The FDIRC (Focusing Detector of Internally Reflected Cherenkov light) is a new concept of PID (Particle IDentification) detector aimed at separating kaons from pions up to a few GeV/c. It is the successor of the BaBar DIRC and benefits from the knowledge accumulated with a first FDIRC prototype built and operated at SLAC. The FDIRC is intended to be used in an environment with a luminosity 100 times higher than for BaBar and Belle. Backgrounds will be higher as well; yet, the FDIRC has been designed to perform at least as well as the View the BaBar DIRC. The main improvement is a complete redesign of the photon camera, moving from a huge tank of ultra-pure water to much smaller focusing cameras with solid fused-silica optics. Furthermore, the detection chain will be 10 times faster than in BaBar to reject more background and to measure more accurately Cherenkov angles. This is achieved using H-8500 MaPMTs and a new front-end electronics (FEE) with significantly improved timing precision, higher hit rate capability, and small dead time. A full-scale FDIRC prototype covering 1/12th of the barrel azimuth is installed at SLAC and has just started recording cosmic-ray data. In this paper, we summarize the FDIRC design, present the status of the prototype test at SLAC and review the ongoing work to analyse the data.
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Contributor : Sabine Starita <>
Submitted on : Wednesday, September 4, 2013 - 4:22:12 PM
Last modification on : Wednesday, September 16, 2020 - 4:23:37 PM




M. Borsato, N. Arnaud, B. Dey, K. Nishimura, D.W.G.S. Leith, et al.. The focusing DIRC: An innovative PID detector. 13th Vienna Conference on Instrumentation (VCI 2013), Feb 2013, Vienna, Austria. pp.333-337, ⟨10.1016/j.nima.2013.08.014⟩. ⟨in2p3-00858110⟩



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