Development of FARICH detector for particle identification system at accelerators
- PDF / 435,141 Bytes
- 3 Pages / 612 x 792 pts (letter) Page_size
- 38 Downloads / 192 Views
velopment of FARICH Detector for Particle Identification System at Accelerators D. A. Finogeeva, *, A. B. Kurepina, V. I. Razina, A. I. Reshetina, E. A. Usenkoa, A. Yu. Barnyakovb, c, M. Yu. Barnyakovb, c, V. S. Bobrovnikovb, c, A. R. Buzykaevb, c, P. V. Kasyanenkob, c, S. A. Kononovb, c, E. A. Kravchenkob, c, I. A. Kuyanovb, c, A. P. Onuchinb, c, I. V. Ovtinb, c, N. A. Podgornovb, c, A. A. Talyshevb, c, and A. F. Danilyukd aInstitute
for Nuclear Research, Russian Academy of Sciences, Moscow, 117312 Russia Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia c Novosibirsk State University, Novosibirsk, 630090 Russia dBoreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia *e-mail: [email protected], [email protected]
bBudker
Abstract⎯Aerogel has been successfully used as a radiator in Cherenkov detectors. In 2004, a multilayer aerogel providing Cherenkov ring focusing was proposed and produced. FARICH (Focusing Aerogel Rich Imaging CHerenkov) detectors such as ARICH for Belle-II (KEK, Japan), Forward RICH for PANDA detector (FAIR, Germany), and FARICH for the Super Charm-Tau factory project (BINP, Novosibirsk) have been developed based on this aerogel. Prototypes of FARICH detector based on MRS APD and Philips DPC photosensors were developed and tested in the framework of this project. An angular resolution for Cherenkov rings of 3.6 mrad was achieved. DOI: 10.1134/S1063779618010100
avalanche photodiodes was assembled in 2009. MRS APD are insensitive to the magnetic field, which extends the field of applicability of this detector. The photosensitivity maximum of MRS APD is near a wavelength of 650 nm, and it amounts to 33%. Special paint for Cherenkov wavelength shifting toward higher APD quantum efficiency was used for Cherenkov light detection by MRS APD. For a wavelength of 410 nm the total PDE quantum efficiency is 11%. The dependence of PDT MRS APD on the light wavelength is shown in Fig. 2. The photodiode amplification coefficient is 5 ×105 for a working voltage of 50 V. The pulse rate of MRS APD dark current at room temperature is 1 MHz. If the temperature is reduced using Peltier ele-
THE CONCEPT OF FARICH DETECTOR The FARICH detector is based on the aerogel radiator situated in front of the photosensitive matrix. The matrix serves for detection of the Cherenkov ring, and the radius of this ring is used to determine the particle velocity. The focusing aerogel radiators are capable of detecting a large number of photons by increasing the radiator thickness without increasing the width of the Cherenkov ring. The focusing aerogel radiator consists of several layers, the refractive indices of these layers are chosen in such a way that Cherenkov rings from each layer overlap (Fig. 1). The specific feature of producing multilayered aerogel radiators is the absence of an air gap between layers, which prevents total internal reflection and light loss. At present, experimental samples of “gradient” ae
Data Loading...
