Large CMS cathode strip chambers: design and performance

Acosta, D.; Apollinari, G.; Blomquist, J.; Breedon, R.; Bondar, N.; Bonushkin, Y.; Borissov, E.; Bujak, A.; Bylsma, B.; Chester, Norman; Chrisman, D.; Cline, D.; Dolinsky, S.; Durkin, S.; Eartly, D. P.; Ferguson, T.; Feyzi, F.; Gilmore, J.; Gorn, L.; Gorn, W.; Gu, J.; Gutay, L.; Hauser, J.; Hershman, Steve; Hoftiezer, J.; Kisselev, O; Ko, W.; Korienek, J.; Korytov, A.; Kubic, J.; Layter, J. G.; Ling, T. Y.; Loveless, R.; Matthey, C.; Matveev, M.; Medved, S.V.; Mitselmakher, G.; Otwinowski, S.; Padley, P.; Petriello, Francis John; Pischalnikov, Y.; Prokofiev, O.; Razmyslovich, V.; Reeder, D.D.; Roberts, J.; Robl, P.; Rush, C.; Santiard, J.C.; Sedov, S; Smith, Bryan; Sobolev, Stephan; Soulimov, V.; Tannenbaum, B.; Terentyev, N.; Vorobyov, A. A.; Yarba, V.A.

doi:10.1016/s0168-9002(00)00627-6

Cited by 16 publications

(10 citation statements)

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“…This shaping time gives an amplifier input charge of about 12% of the total charge collected by the anode wire [12]. For a discriminator threshold as low as 20 fC, the efficiency plateau starts at 3.4 kV for a gas mixture of Ar(40%) + CO2(50%) + CF4(10%) [3]. The nominal high voltage operating point of the chamber is typically 3.6 kV.…”

Section: 5mentioning

confidence: 99%

“…Increasing the threshold by 20 fC shifts the plateau up by about 130 V. As was mentioned earlier, the time distribution of anode signals from a single chamber layer is too wide (RMS ~ 11 ns) to provide effective 25 ns bunch crossing identification. Using the time of the second, third, or fourth earliest hit out of 6 chamber hits forming a track-like pattern makes the time distribution much narrower (RMS ~ 5 ns) [3]. As a result, the bunch crossing tagging efficiency rises well above the baseline 92% level practically at the beginning of the plateau at 3.4 kV (Fig.…”

Section: On Chamber Performancementioning

confidence: 99%

“…Figure 9: Anode wire trigger performance vs. high voltage on a chamber: the probability of tagging the correct bunch crossing by using the first, second, and third earliest hits in the local charge trigger pattern [3]. The 92% baseline is shown by the dotted line.…”

Section: On Chamber Performancementioning

confidence: 99%

“…Anode wire readout trigger performance (probability of tagging the correct bunch crossing by using the fourth earliest hit in the local charge trigger pattern) vs. random hit rate. The expected LHC rate is shown by the shaded area and the benchmark efficiency is shown as a dotted line [3].…”

Section: On Chamber Performancementioning

confidence: 99%

“…The large spread of the anode drift times with a maximum of 50 ns is overcome by the requirement to have a coincidence of more than 3 layers for anode wire hits forming the predefined track patterns. The best definition of the LHC beam bunch crossing time of 25 ns in this case is given by the use of the time of the second or even the third or fourth earliest anode hit [2,3]. This procedure is less vulnerable to random hit backgrounds than using just the first hit and provides a high-efficiency bunch crossing identification, the formal requirement being 92% per CSC [2].…”

Section: Introductionmentioning

confidence: 99%

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Anode front-end electronics for the cathode strip chambers of the CMS Endcap Muon detector

Ferguson

Bondar

Golyash

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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The front-end electronics system for the anode signals of the CMS Endcap Muon cathode strip chambers has about 183000 channels. The purposes of the anode front-end electronics are to acquire precise muon timing information for bunch crossing number identification at the Level-1 muon trigger system and to provide a coarse radial position of the muon track. Each anode channel consists of an input protection network, amplifier, shaper, constant-fraction discriminator, and a programmable delay. The essential parts of the electronics include a 16-channel amplifier-shaper-discriminator ASIC CMP16 and a 16-channel ASIC D16G providing programmable time delay. The ASIC CMP16 was optimized for the large cathode chamber size (up to 3 x 2.5 m 2 ) and for the large input capacitance (up to 200 pf). The ASIC combines low power consumption (30 mW/channel) with good time resolution (2 -3 ns). The delay ASIC D16G makes possible the alignment of signals with an accuracy of 2.2 ns. This note presents the anode front-end electronics structure and results of the preproduction and the mass production tests, including radiation resistance and reliability tests. The special set of test equipment, techniques, and corresponding software developed and used in the test procedures are also described.

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Section: 5mentioning

confidence: 99%

Section: On Chamber Performancementioning

confidence: 99%

Section: On Chamber Performancementioning

confidence: 99%

Section: On Chamber Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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