Y. Aita

Y. Asaoka; Y. Aita; T. Aoki; Makoto Sasaki

We have developed a 16-inch ultraviolet-ray image intensifier (UVII) tube to form the spherical focal surface of the All-sky Survey High Resolution Air-shower Detector (Ashra) telescope, a new air fluorescence and Cerenkov detector to observe TeV gamma rays, very high energy neutrinos, and extremely high energy cosmic rays. The UVII has a very large effective photocathode area of 16-inch diameter and reduces an image size to 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 telescope. Thus, UVII 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. The UVII achieves a high resolution of 3.4 Lp/mm at the input window. The output screen of the UVII is made of a fiber optic plate (FOP) with a concave shape to optimize the electric lens configuration under the fixed curvature of input window. This results in an almost uniform resolution over the whole sensitive area. We have adopted a P47 phosphor screen with a 10% decay time of /spl sim/100 ns and have obtained an amplification factor of about 100. In this paper we present the design, construction, and performance of the 16-inch UVII.

Yasuo Arai; Y. Aita; T. Aoki; Y. Asaoka; T.E. Browder; C. Fukunaga; T. Hayashino; Yukihito Higashi; J. Hisano; W. S. Hou; Y. B. Hsiung; M. Ieiri; M. Jobashi; Charles C. H. Jui; J. G. Learned; Eugene C. Loh; Naohiro Manago; S. Matsuno; J. Matthew; K. Nakai; S. Nakamura; Sonoko Ogawa; A. Okumura; S. L. Olsen; K. Sakurazawa; Makoto Sasaki; Naoshi Sugiyama; Yuetsu Tanaka; V. Vladimir; Minzu Wang

Y. Aita; T. Aoki; Y. Asaoka; T.E. Browder; T. Chonan; S. Dye; M. Eguchi; R. Fox; J. Hamilton; Yukihito Higashi; T. Kimura; N. Kohta; Hiroaki Kuze; J. G. Learned; M. Masuda; S. Matsuno; Y. Morimoto; K. Noda; S. Ogawa; A. Okumura; S. Olsen; Makoto Sasaki; H. Shibuya; K. Shinomiya; Naoshi Sugiyama; Y. Yamaguchi; M. Yasuda; G. Varner; Y. Watanabe

Makoto Sasaki; Y. Aita; T. Aoki; Y. Asaoka; T.E. Browder; T. Chonan; S. Dye; M. Eguchi; R. Fox; G. Guillian; J. Hamilton; Yukihito Higashi; T. Kimura; N. Kohta; Hiroaki Kuze; J. G. Learned; M. Masuda; S. Matsuno; Y. Morimoto; K. Noda; S. Ogawa; A. Okumura; S. Olsen; H. Shibuya; K. Shinomiya; Naoshi Sugiyama; Y. Yamaguchi; M. Yasuda; G. Varner; Y. Watanabe

Makoto Sasaki; Naohiro Manago; Y. Aita; Y. Asaoka; M. Jobashi; K. Noda; A. Okumura; Y. Ogawa; T. Chonan; Y. Watanabe; J. G. Learned; S. Matsuno; S. Olsen

Y. Asaoka; Y. Aita; T. Aoki; Makoto Sasaki

Y. Aita; S. Kuze; C. Kanokohata; H.M. Motz; G.W.S. Hou; J. Goldman; H. Shibuya; Sonoko Ogawa; T. Takada; S. Matsuno; J. G. Learned; K. Ueno; J.G. Shu; Y. Asaoka; T. Kimura; Y.B. Hsiung; M. Wang; C. Abiko; Naoshi Sugiyama; Y. Watanabe; C.C. Hsu; P.M. Binder; T. Aoki; P. Chang; Makoto Sasaki

Y. Aita; Y. Asaoka; Takao Chonan; Yukihito Higashi; K. Noda; Makoto Sasaki; Y. Morimoto; Sonoko Ogawa; J. G. Learned; Richard N. Fox

Y. Aita; T. Aoki; Y. Asaoka; T.E. Browder; T. Chonan; S. Dye; M. Eguchi; R. Fox; J. Hamilton; Yukihito Higashi; T. Kimura; N. Kohta; Hiroaki Kuze; J. G. Learned; M. Masuda; S. Matsuno; Y. Morimoto; K. Noda; S. Ogawa; A. Okumura; S. Olsen; M. Sasaki; H. Shibuya; K. Shinomiya; Naoshi Sugiyama; Y. Yamaguchi; M. Yasuda; G. Varner; Y. Watanabe

Makoto Sasaki; Naohiro Manago; Y. Aita; Toshiaki Aoki; Y. Asaoka; M. Jobashi; K. Noda; A. Okumura; Sonoko Ogawa; Takao Chonan; Yutaka X. Watanabe