Showing papers by "J. Haba published in 1992"
01 Dec 1992-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The VENUS-TRD as discussed by the authors is a cylindrical transition radiation detector, extending from 127 cm to 157.7 cm radially and 296 cm axially, with an angular region of |cos θ| R π = 1 e π ] at an electron efficiency of 90%.
Abstract: The VENUS-TRD is a cylindrical transition radiation detector, extending from 127 cm to 157.7 cm radially and 296 cm axially. It is designed to improve the e/π separation capability of the VENUS detector by a factor of 10 in order to complement the lead glass calorimeter. It covers an angular region of |cos θ| R π = 1 e π ) at an electron efficiency of 90% is Rπ = 10±1 and 15±2 for isolated tracks with a momentum range of 1 1 GeV/c in hadronic events due to overlap of the tracks in the chamber cells of the TRD. The VENUS-TRD is the largest TRD to perform in colliding beam experiments.
8 citations
01 Jan 1992-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, the authors describe the design and construction of a large cylindrical transition radiation detector (TRD) for the VENUS experiment at the e+e+ storage ring, TRISTAN.
Abstract: We describe the design considerations and construction techniques of a large cylindrical transition radiation detector (TRD), 296 cm long and 311.4 cm in diameter, for the VENUS experiment at the e+e+ storage ring, TRISTAN. The design is based on measurements by using test chambers with e/π beams and X-ray sources. The test results will be fully described. The TRD contains four modules of radiators, each followed by an X-ray chamber with 8192 (2688) total (sense) wires. The gain calibration of all sense wires has been completed with an accuracy of 5%. The TRD is expected to provide a pion rejection ratio of 15±3 with an electron efficiency of 90% for isolated tracks with momenta above 1 GeV/c.
8 citations
10 May 1992-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, the spatial resolution of a silicon microstrip detector was investigated experimentally for the charged particles with incident angles of 0°, 10°, 30°, 50°, 60°, 70° and 75°.
Abstract: Spatial resolution of a silicon microstrip detector was investigated experimentally for the charged particles with incident angles of 0°, 10°, 30°, 50°, 60°, 70° and 75°. The resolution for normal incidence was found to be 5.7 μm with the standard centroid technique for induced charge. In order to achieve better resolution for large angle incidence, a new centroid method was developed, with which the position resolution of 40μm was achieved for the particles with incident angle of 75°.
7 citations
University of Tsukuba1, Tokyo Metropolitan University2, Tohoku University3, Hiroshima University4, Wakayama Medical University5, Osaka University6, Kyoto University7, Tohoku Gakuin University8, Kobe University9, University of Helsinki10, University of Tokyo11, University of Miyazaki12, Toho University13, Okayama University14, Kogakuin University15, Naruto University of Education16
TL;DR: In this article, the forward-backward charge asymmetry in the process of b-quark production in e + e − annihilation at TRISTAN was measured by detecting prompt leptons from bquarks.
4 citations
Kyoto University1, Tohoku University2, University of Tsukuba3, Tokyo Metropolitan University4, Hiroshima University5, Wakayama Medical University6, Osaka University7, Tohoku Gakuin University8, Kobe University9, University of Helsinki10, University of Tokyo11, University of Miyazaki12, Toho University13, Okayama University14, Kogakuin University15, Naruto University of Education16
TL;DR: The forward-backward asymmetry of charm quark production has been measured at an average of energy of 58.4 GeV with the VENUS detector at the TRISTAN e+e- collider as mentioned in this paper.
4 citations
25 Oct 1992
TL;DR: The flip-chip bonding (FCB) method, using an anisotropic conductive film, is applied to both sides of the detector unit to bond 640 strips at a pitch of 50 mu m.
Abstract: Full-size models of a detector unit for a silicon microvertex-detector for the KEK B factory are built. The model consists of four dummy double-sided, double-metal silicon microstrip detectors and two silicon end boards with dummy readouts VLSIs mounted on both sides. In this trial the flip-chip bonding (FCB) method, using an anisotropic conductive film, is applied to both sides of the detector unit to bond 640 strips at a pitch of 50 mu m. The structure using the FCB method successfully provides a new architecture for the detector unit of a vertex detector. >
3 citations
25 Oct 1992
TL;DR: In this article, a large cylindrical transition radiation detector has been constructed as a part of the Venus detector for the TRISTAN e/sup +/e/sup -/ collider.
Abstract: A large cylindrical transition radiation detector has been constructed as a part of the Venus detector for the TRISTAN e/sup +/e/sup -/ collider. It was designed to supplement the e/ pi separation capability of the lead glass calorimeter. The detector has a total of 2688 channels of readout electronics. The electronics uses the method of charge amplifier-trapezoidal shaping. Each TKO board contains 32 channels of shaper-gated integrators and a 12 bit analog-to-digital converter. The circuit has typically an 11 b linearity. The gas gain of each X-ray chamber is kept constant within +or-1% by monitoring 5.9 keV X-ray signals of an /sup 55/Fe source. The system has been operating for about a year and works well. The TRD gives a pion rejection factor of 13+or-3 for 90% electron efficiency and 30+or-3 for 80% electron efficiency. >
1 citations