Recent Progress in Silica Aerogel Cherenkov Radiator

Tabata, M.; Adachi, I.; Kawai, H.; Kubo, Mitsunori; Sato, Takeshi

doi:10.1016/j.phpro.2012.02.410

Cited by 39 publications

(33 citation statements)

References 16 publications

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“…The other advantage of the pin-drying method is improved transparency [9], [14], caused by the modification of the nanoscale structure. Fig.…”

Section: A New Aerogel Production Technique: Pin-drying Methodsmentioning

confidence: 99%

“…= lO IS, respectively. In this configuration, nta g = 1.054 and 1.065 aerogels produced by a novel pin-drying method [9] were used as upstream and downstream radiators, respectively, where nta g is the refractive index measured at the corner of the aerogel tiles by the laser Fraunhofer method. Because pin dried aerogels in this refractive index range have refractive index gradients in the transverse planar direction [10], the local refractive indices at the tile center penetrated by the beam are estimated to be n rv 1.048 and 1.058 for the upstream and downstream aerogels, respectively.…”

Section: Large Aerogel Tile Production and Optical Performancementioning

confidence: 99%

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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 other advantage of the pin-drying method is improved transparency [9], [14], caused by the modification of the nanoscale structure. Fig.…”

Section: A New Aerogel Production Technique: Pin-drying Methodsmentioning

confidence: 99%

Section: Large Aerogel Tile Production and Optical Performancementioning

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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“…The pin-drying method is a powerful technique developed at Chiba University to create aerogels with ultrahigh refractive index and/or long transmission length [15]. The pin-drying method follows all the procedures of the conventional method, but one process (i.e., the pin-drying process) is added between the aging of wet gels and the hydrophobic treatment.…”

Section: Production Methodsmentioning

confidence: 99%

“…We then investigated a new production technique, known as the pindrying method [12,13], which is based on the sol-gel method. The study generated aerogels with the indices of refraction as high as 1.26 and with practical transmission lengths (Λ T > 20 mm) [13][14][15]. Moreover, the pin-drying method enabled us to produce aerogels with transmission lengths up to 60 mm and with an index of refraction n = 1.05 to 1.075 [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The study generated aerogels with the indices of refraction as high as 1.26 and with practical transmission lengths (Λ T > 20 mm) [13][14][15]. Moreover, the pin-drying method enabled us to produce aerogels with transmission lengths up to 60 mm and with an index of refraction n = 1.05 to 1.075 [13][14][15][16]. In contrast to these high-refractiveindex aerogels, ultralow-density aerogels with n = 1.003 (ρ = 0.01 g/cm 3 ) were developed using the classic method [13].…”

Section: Introductionmentioning

confidence: 99%

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Progress in Development of Silica Aerogel for Particle- and Nuclear-Physics Experiments at J-PARC

Tabata

Kawai²

2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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This study presents the advancement in hydrophobic silica aerogel development for use as Cherenkov radiators and muonium production targets. These devices are scheduled for use in several particleand nuclear-physics experiments that are planned in the near future at the Japan Proton Accelerator Research Complex. Our conventional method to produce aerogel tiles with an intermediate index of refraction of approximately 1.05 is extended so that we can now produce aerogel tiles with lower indices of refraction (i.e., 1.03-1.04) and higher indices of refraction (i.e., 1.075-1.08); each with excellent transparency. A new production method, called pin drying, was optimized to produce larger area aerogels consistently with an ultrahigh index of refraction (>1.10). In addition, for use as a thermal-muonium-emitting material at room temperature, dedicated low-density aerogels were fabricated using the conventional method.

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