Development of a 16-inch UV-ray image intensifier tube

Asaoka, Y.; Aita, Y.; Aoki, Tsutomu; Sasaki, M.

doi:10.1109/tns.2005.856771

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The curved focal plane of the A-T design can be coupled with large aperture electrostatic image intensifiers, since the focal plane is naturally convex, e.g. [ 33,34]. In this implementation the dead space is automatically zero, if the photocathode has a uniform quantum efficiency over the full entrance window of the intensifier.…”

Section: Discussionmentioning

confidence: 99%

Wide field aplanatic two-mirror telescopes for ground-based γ-ray astronomy

Vassiliev

Fegan

Brousseau

2007

Astroparticle Physics

176

146

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The field of very high energy (VHE) ground-based γ-ray astronomy, pioneered by the Whipple 10m atmospheric Cherenkov telescope (ACT) [ 1], is being revolutionized by the second generation observatories, H.E.S.S.[ 2], MAGIC [ 3], and VERITAS [ 4]. Dozens of new γ-ray sources, some representing new classes of VHE emitters, have been discovered during the last decade [ 5]. In space based gamma-ray astronomy a leap in technology from SAS-2/COS-B [ 6,7] to EGRET [ 8] lead to an order of magnitude increase in detected sources; the leap to GLAST/LAT [ 9, 10] technology is anticipated to produce a further order of magnitude increase. The lesson to be learned is that increases in sensitivity, angular resolution and ultimately in scientific output comes through progress in detector technology. In anticipation of such progress it is valuable to re-evaluate the design limitations of current generation ACT observatories and to investigate where improvements can be made that will lead to the next generation. In this paper we focus on one component, the optical system.

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Section: Discussionmentioning

confidence: 99%

Wide field aplanatic two-mirror telescopes for ground-based γ-ray astronomy

Vassiliev

Fegan

Brousseau

2007

Astroparticle Physics

176

146

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“…Ashra detector is a complex of unconventional optical light collectors (LCs) , each of those has 42 • diameter field of view. An image of the optical collector is focused on the large electrostatic lense [4] followed by the image pipeline, which is shown in Figure 3. The image pipeline split and transport the image to both a trigger device and a high-gain, high-resolution complementary metal-oxide semiconductor image sensor.…”

Section: Ashra Detectormentioning

confidence: 99%

Trigger and Readout System for the Ashra-1 Detector

Aita¹,

Aoki²,

Asaoka³

et al. 2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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Highly sophisticated trigger and readout system has been developed for All-sky Survey High Resolution Air-shower (Ashra) detector. Ashra-1 detector has 42 degree diameter field of view. Detection of Cherenkov and fluorescence light from large background in the large field of view requires finely segmented and high speed trigger and readout system. The system is composed of optical fiber image transmission system, 64x64 channel trigger sensor and FPGA based trigger logic processor. The system typically processes the image within 10 to 30 ns and opens the shutter on the fine CMOS sensor. 64x64 coarse split image is transferred via 64x64 precisely aligned optical fiber bundle to a photon sensor. Current signals from the photon sensor are discriminated by custom made trigger amplifiers. FPGA based processor processes 64x64 hit pattern and correspondent partial area of the fine image is acquired. Commissioning earth skimming tau neutrino observational search was carried out with this trigger system. In addition to the geometrical advantage of the Ashra observational site, the excellent tau shower axis measurement based on the fine imaging and the night sky background rejection based on the fine and fast imaging allow zero background tau shower search. Adoption of the optical fiber bundle and trigger LSI realized 4k channel trigger system cheaply. Detectability of tau shower is also confirmed by simultaneously observed Cherenkov air shower. Reduction of the trigger threshold appears to enhance the effective area especially in PeV tau neutrino energy region. New two dimensional trigger LSI was introduced and the trigger threshold was lowered. New calibration system of the trigger system was recently developed and introduced to the Ashra detector

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“…PLI is based on the success on the development of a 16-in. UV-ray image intensifier tube [7], which is a modification of a commercial Xray image intensifier widely used in medical imaging. 16-in.…”

Section: General Descriptionmentioning

confidence: 99%

Performance of a 20-in. photoelectric lens image intensifier tube

Asaoka

Sasaki

2011

Nuclear Instruments and Methods in Physics Research Section A:

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We have evaluated a 20-in. photoelectric lens image intensifier tube (PLI) to be mounted on the spherical focal surface of the Ashra light collectors, where Ashra stands for All-sky Survey High Resolution Air-shower Detector, an unconventional optical collector complex that images air showers produced by very high energy cosmic-ray particles in a 42$^\circ$-diameter field of view with a resolution of a few arcminutes. The PLI, the worlds largest image intensifier, has a very large effective photocathode area of 20-in. diameter and reduces an image size to less than 1-inch diameter using the electric lens effect. This enables us to use a solid-state imager to take focal surface images in the Ashra light collector. Thus, PLI is a key technology for the Ashra experiment to realize a much lower pixel cost in comparison with other experiments using photomultiplier arrays at the focal surface. In this paper we present the design and performance of the 20-in. PLI.Comment: 12 pages, 7 fugre

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Development of a 16-inch UV-ray image intensifier tube

Cited by 6 publications

References 3 publications

Wide field aplanatic two-mirror telescopes for ground-based γ-ray astronomy

Wide field aplanatic two-mirror telescopes for ground-based γ-ray astronomy

Trigger and Readout System for the Ashra-1 Detector

Performance of a 20-in. photoelectric lens image intensifier tube

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