Study of 144-channel hybrid avalanche photo-detector for Belle II RICH counter

Shiizuka, S.; Adachi, I.; Dolenec, R.; Hara, K.; Iijima, T.; Ikeda, Hirokazu; Imamura, M.; Iwata, S.; Korpar, S.; Križan, P.; Kumita, T.; Kuroda, E.; Nishida, S.; Ogawa, S.; Pestotnik, R.; Šantelj, L.; Sumiyoshi, T.; Tabata, M.; Tagai, Rie

doi:10.1016/j.nima.2010.06.343

Cited by 12 publications

(8 citation statements)

References 5 publications

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“…1c. [16], which were read out by the electronics described in [17], was arranged in a light-shielded box. The distance between the upstream surface of an aerogel tile, used as a radiator, and the photodetection plane was set to 20 cm (i.e., the setup was that of a proximity focusing RICH counter).…”

Section: Beam Testmentioning

confidence: 99%

Optical and Radiographical Characterization of Silica Aerogel for Cherenkov Radiator

Tabata

Adachi

Hatakeyama

et al. 2012

IEEE Trans. Nucl. Sci.

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Abstract-We present optical and X-ray radiographical characterization of silica aerogels with refractive index from 1.05 to 1.07 for a Cherenkov radiator. A novel pin-drying method enables us to produce highly transparent hydrophobic aerogels with high refractive index by shrinking wet-gels. In order to investigate the uniformity in the density (i.e., refractive index) of an individual aerogel monolith, we use the laser Fraunhofer method, an X-ray absorption technique, and Cherenkov imaging by a ring imaging Cherenkov detector in a beam test. We observed an increase in density at the edge of the aerogel tiles, produced by pin-drying.Index Terms-Cherenkov ring imaging, refractive index, silica aerogel, X-ray absorption.

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Section: Beam Testmentioning

confidence: 99%

Optical and Radiographical Characterization of Silica Aerogel for Cherenkov Radiator

Tabata

Adachi

Hatakeyama

et al. 2012

IEEE Trans. Nucl. Sci.

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“…To efficiently separate charged pions from kaons at momenta up to 4 GeV/c (our goal is a 1flK separation capability of more than 40'), we need a highly transparent Cherenkov radiator with a refractive index n of approximately 1.05; therefore, we have been developing high-quality silica aerogels since the early 2000s. In addition, the A-RICH group is developing 144-ch multi-anode hybrid avalanche photodetectors [2]- [4] as Cherenkov light sensors with Hamamatsu Photonics K.K. using dedicated readout electronics (ASIC) [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Development of large area silica aerogel used as RICH radiator for the Belle II experiment

Tabata

Adachi

Hatakeyama

et al. 2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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This p a p er p resents the recent p ro g ress in the develo p ment of lar g e-area hydro p hobic silica aero g els for use as radiators in the aero g el-based rin g -ima g in g Cherenkov (A RICH) counter that will be installed in the forward end ca p of the Belle II detector. The p roximity-focusin g A-RICH counter is desi g ned to identify char g ed p ions and kaons and to have a se p aration ca p ability of more than 40" at momenta u p to 4 GeV/c.In a focusin g -dual-layer radiator with different refractive indices, a p rototy p e A-RICH counter satisfied the required p erformance usin g our conventional aero g el tiles with refractive indices n of 1.045 and LOSS, transmission len g ths AT of 3�0 mm, and desi g ned final dimensions of 18 x 18 x 2 cm 3 • Moreover, we achieved better 1[/ K se p aration p erformance usin g n rv 1.06 aero g els with relatively small dimensions but lon g transmission len g th (AT> SO mm) produced by a novel p in-dryin g method.We need to fill the lar g e end ca p area of 3.5 m 2 with two layer aero g el tiles and to minimize the number of tiles with realistic dimensions to reduce the tile boundaries, at which the number of detected p hotoelectrons decreases. Therefore, we studied lar g e area aero g el p roduction by both conventional and p in-dryin g methods as a key to achievin g hi g h p erformance over the actual detector. This p a p er discusses the crack-free yield, o p tical trans p arency, and uniformity in refractive index within a monolith of recently p roduced large area aerogels. I. INT RODUCTIONT HE aerogel-based ring-imaging Cherenkov (A-RICH) counter is one of the particle identification devices for the Belle II experiment [1] that will be performed using the SuperKEKB accelerator at KEK, Japan. The Belle II is a super B factory experiment to search for new physics beyond the standard model of particle physics through flavor physics and C P violation measurements. Because the forward end cap of the Belle II detector has a limited space, the A-RICH system is designed as a proximity-focusing RICH counter. To

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“…The gain of about 6x10 8 guarantees unambiguous detection of single photons, possible even with unamplified signals (see Figs. [2][3][4][5]. Approximately 30-40% of electrons scatter back into vacuum from the LYSO scintillator after a fraction of their energy has already been converted into secondary photons.…”

Section: Waveforms and Pulse Height Spectramentioning

confidence: 99%