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首页> 美国政府科技报告 >Detailed Study of FDIRC Prototype with Waveform Digitizing Electronics in Cosmic Ray Telescope using 3D Tracks.
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Detailed Study of FDIRC Prototype with Waveform Digitizing Electronics in Cosmic Ray Telescope using 3D Tracks.

机译：利用3D轨迹在宇宙射线望远镜中利用波形数字化电子技术研究FDIRC原型。

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The DIRC detector at the BaBar experiment provided excellent particle identification performance. Based on this success, our group has been following an R&D program to develop a compact and fast detector for future particle identification systems. Our initial attempt was to build the first FDIRC prototype, which was capable of measuring x-y coordinates for each photon with an angular resolution similar to the present BaBar DIRC, but, in addition, could also measure the time-of-propagation (TOP1) of each photon along the fused silica bar with a 200-250 ps single-photoelectron timing resolution (the present BaBar DIRC has a timing resolution of only o approx. 1.6 ns). The first FDIRC prototype had a successful SLAC test beam run. It was the first RICH detector to demonstrate correction of chromatic error by timing. In these initial tests we used Elantek 2075 amplifiers with a gain of 40x, and custom constant-fraction discriminators (CFD) coupled to a 25 ps/count Philips 7186 TDC. These initial tests concentrated on proving the principle of focusing optics, learning to operate highly pixilated fast detectors, and showing that the chromatic broadening can be corrected by timing. In this paper we present a study of the second FDIRC prototype, which has the same optics as the first prototype, but incorporates a different set of detectors and electronics; we used six 64-pixel H- 8500 MaPMTs, which were read out by the highly integrated electronics based on the BLAB2 ASIC.

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