Abstract
A fast integrated electronic chain is presented to read out the cathode pad array of a multiwire photon detector for a fast RICH counter. Two VLSI circuits have been designed and produced. An analog eight-channel, low-noise, fast, bi-polar current preamplifier-amplifier and discriminator chip serves as the front-end detection electronics. It has an rms equivalent noise current of 10 nA, 50 MHz bandwidth with 10 mW of power consumption per channel. Two analog chips are coupled to a digital sixteen-channel CMOS readout chip, operating at 20 MHz with a power consumption of 6 mW per channel. Readout of a 4000 pad sector requires 2–3 μs, depending on the number of hit pads. The full RICH counter is made up of many such sectors, read out in parallel. The minimum time needed to separate successive hits on the same pad is 70 ns. The conception of the digital chip and its properties are fully presented in this report. The analog chip is described in less detail since it will be fully covered in a forthcoming paper.
Highlights
Particle identifying RICH counters at high-luminosity hadron colliders (Tevatron, LHC, SSC, Eloisatron) will require fast, pixel photon detectors sensitive to UV light and capable of opera tion in a high multiplicity environment at interaction rates up to 100 M}-Iz
These photodetectors are fast with small time dis persion but they require a large number of pixels to uniquely determine the photoconversion points
They are well suited for use at high—lurninosity hadron colliders because the fast timing avoids mixing events from successive beam crossings
Summary
Particle identifying RICH (ring imaging Cherenkov) counters at high-luminosity hadron colliders (Tevatron, LHC, SSC, Eloisatron) will require fast, pixel photon detectors sensitive to UV light and capable of opera tion in a high multiplicity environment at interaction rates up to 100 M}-Iz. Since the produced photoelectrons are reflectively in jected back into the atmospheric pressure carrier gas, the same amplifying structures used for gaseous track ing detectors (MWPC or PPAC) can be used to detect single electrons from photocathodes These photodetectors are fast with small time dis persion (tr, = 10-20 ns for TEA or TMA, o, = 1 ns for CsI or CsI/TMAE) but they require a large number of pixels (electronic channels) to uniquely determine the photoconversion points. The design and operation of the digital CMOS chip is fully presented in this paper These chips are con nected to form a two-dimensional array of 3840 chan nels per sector. Tests of the readout chain are reported followed by a summary and conclusions
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