FRONTIER DETECTORS FOR FRONTIER PHYSICS

Progress on development of the new FDIRC PID detector

25 May 2012, 15:55

20m

<font color=green >La Biodola, Isola d'Elba, Italy</color=green><!-- ID_UTENTE=804 -->

Oral S3 - PID and Photo Detectors PID and Photo Detectors

Speaker

Dr Jerry Vavra (SLAC)

Description

We present a progress status of a new concept of PID detector called FDIRC, intended to be used at the SuperB experiment, which requires $\pi/K$ separation up to a few GeV/c. The BaBar experiment has used very successfully the DIRC PID detector (DIRC = Detector of Internally Reflected Cherenkov light). The original DIRC had one weak point: its huge photon camera, filled with 6,000 liters of ultra-pure water, was sensitive to electromagnetic and neutron background. Therefore we have exchanged this simple pinhole camera at the heart of the DIRC detector into a focusing camera with sophisticated, solid fused-silica optics, while shrinking it to 1/25th its former size and increasing its speed by a factor of ten. The new detector is called FDIRC (Focused Detection of Internally Reflected Cherenkov light). Each of the 12 FDIRC Photon cameras will have 48 H-8500 MaPMTs, providing excellent timing capability for single photons ($\sigma_{TTS}$~140ps). It was also necessary to implement new front-end electronics with much higher timing precision (σElectronics ~100ps), higher hit rate capability (few MHz hit rate per pixel), and small dead time (< 5% at 1MHz rate). These improvements will compensate for the increase in luminosity (×100) and background between the two generations of experiments. A full scale FDIRC prototype module covering 1/12 of the barrel azimuth is nearing completion, and will be tested soon in the cosmic ray telescope (CRT) at SLAC with 3D tracking using muons.

Optional extended abstract

Progress on development of the new FDIRC PID detector

J. Va’vra b,+, N. Arnaud c , A.Yu. Barnyakov a, M.Yu. Barnyakov a,C. Beigbeder c, M. Benetton ij, M. El Berni c, D. Breton c, L.Burmistrov c, G. Collazuol j,k, B.Dey g, F. Gargano e, F. Giordano e,f, H. Jawahery i, E.A. Kravchenko a, S.A. Kononov a, H.Lebbolo d, D.W.G.S. Leith b, F. Loparco e,f, M.N. Mazziotta e , J. Maalmi-Di Bello c, K.Nishimura h, A.P. Onuchin a, M. Posocco j, V.Puill c, B.Ratcliff b, D.Roberts i, G. Simi j,k, A.Stocchi c, D. Shtol a, R. Stroili j,k, V. Tocut c, E.Twedt i , G.S.Varner h
a Budker Institute of Nuclear Physics, Novosibirsk, Russia
b SLAC, Stanford University, CA 94309, U.S.A.
c LAL (IN2P3/CNRS and Univ. Paris Sud), France
d LPNHE (IN2P3/CNRS, Universités Pierre & Marie Curie et Paris Diderot), France
e Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy
f Dipart. di Fisica ‘‘M. Merlin’’ dell’Universita` e del Politecnico di Bari, Bari, Italy
g University of California, Riverside, U.S.A.
h University of Hawaii, Honolulu, HI 96822, U.S.A.
i University of Maryland, U.S.A.
j Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
k Dipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, I-35131 Padova, Italy

Abstract:
We present a progress status of a new concept of PID detector called FDIRC, intended to be used at the SuperB experiment, which requires pi/K separation up to a few GeV/c. The BaBar experiment has used very successfully the DIRC PID detector (DIRC = Detector of Internally Reflected Cherenkov light). The original DIRC had one weak point: its huge photon camera, filled with 6,000 liters of ultra-pure water, was sensitive to electromagnetic and neutron background. Therefore we have exchanged this simple pinhole camera at the heart of the DIRC detector into a focusing camera with sophisticated, solid fused-silica optics, while shrinking it to 1/25th its former size and increasing its speed by a factor of ten. The new detector is called FDIRC (Focused Detection of Internally Reflected Cherenkov light). Each of the 12 FDIRC Photon cameras will have 48 H-8500 MaPMTs, providing excellent timing capability for single photons (σTTS ~140ps). It was also necessary to implement new front-end electronics (FEE) with much higher timing precision (σElectronics ~100ps), higher hit rate capability (few MHz hit rate per pixel), and small dead time (< 5% at 1MHz rate). These improvements will compensate for the increase in luminosity (×100) and background between the two generations of experiments. The new optics was designed by hand ray-tracing method, verified by a computer ray-tracing, and finally checked by the 3D MC simulation. A full scale FDIRC prototype module covering 1/12 of the barrel azimuth is nearing completion, and will be tested soon in the cosmic ray telescope (CRT) at SLAC with 3D tracking using muons. The aim will be to determine the angular resolution of the Cherenkov rings and verify that it agrees with the MC simulation, and to check various schemes of electronics. We will present highlights of this effort, including a summary of various tests performed so far.

• Presenter

for the collaboration

SuperB

Presentation materials

Slides

Vavra_new_FDIRC_talk.pdf

Video

rtsp://real2.infn.it/webcast/pisa-meeting-2012/pisa-meeting-2012-67-progress-on-development-of-the-new-fdirc-pid-detector-vavra.rm