CERN Accelerating science

Article
Report number	arXiv:2402.03971
Title	The CMS Fast Beam Condition Monitor for HL-LHC
Author(s)	Auzinger, G. (CERN) ; Bakhshiansohi, H. (Isfahan Tech. U.) ; Dabrowski, A. (CERN) ; Delannoy, A.G. (Oxford U.) ; Dierlamm, A. (KIT, Karlsruhe, IKP) ; Dragicevic, M. (Vienna, OAW) ; Gholami, A. (Isfahan Tech. U.) ; Gomez, G. (Cantabria Inst. of Phys.) ; Guthoff, M. (DESY) ; Haranko, M. (CERN) ; Homna, A. (CERN) ; Jenihhin, M. (Tallinn U. Tech.) ; Kaplon, J. (CERN) ; Karacheban, O. (Rutgers U., Piscataway ; CERN) ; Korcsmáros, B. (Debrecen U.) ; Liu, W.H. (Oxford U. ; CERN) ; Lokhovitskiy, A. (Canterbury U.) ; Loos, R. (CERN) ; Mallows, S. (KIT, Karlsruhe, IKP) ; Michel, J. (CERN) ; Myronenko, V. (DESY) ; Pásztor, G. (Eotvos U.) ; Pari, M. (CERN) ; Schwandt, J. (Hamburg U.) ; Sedghi, M. (Isfahan Tech. U.) ; Shevelev, A. (Princeton U.) ; Shibin, K. (Tallinn U. Tech.) ; Steinbrueck, G. (Hamburg U.) ; Stickland, D. (Princeton U.) ; Ujvari, B. (Debrecen U.) ; Wegrzyn, G.J. (CERN)
Publication	2024-03-19
Imprint	2024-02-06
Number of pages	12
Note	16th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD23) 2023 Sept 25-29 Siena, Italy
In:	JINST 19, 03 (2024) pp.C03048
In:	16th Topical Seminar on Innovative Particle and Radiation Detectors, Siena, Italy, 25 - 29 Sep 2023, pp.C03048
DOI	10.1088/1748-0221/19/03/C03048
Subject category	physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS CERN HL LHC
Abstract	The high-luminosity upgrade of the LHC brings unprecedented requirements for real-time andprecision bunch-by-bunch online luminosity measurement and beam-induced background monitoring. Akey component of the CMS Beam Radiation, Instrumentation and Luminosity system is a stand-aloneluminometer, the Fast Beam Condition Monitor (FBCM), which is fully independent from the CMScentral trigger and data acquisition services and able to operate at all times with a triggerlessreadout. FBCM utilizes a dedicated front-end application-specific integrated circuit (ASIC) toamplify the signals from CO$_{2}$-cooled silicon-pad sensors with a timing resolution of a fewnanoseconds, which enables the measurement of the beam-induced background. FBCM uses a modulardesign with two half-disks of twelve modules at each end of CMS, with four service modules placedclose to the outer edge to reduce radiation-induced aging. The electronics system design adaptsseveral components from the CMS Tracker for power, control and read-out functionalities. Thededicated FBCM23 ASIC contains six channels and adjustable shaping time to optimize the noise withregards to sensor leakage current. Each ASIC channel outputs a single binary high-speedasynchronous signal carrying time-of-arrival and time-over-threshold information. The chip outputsignal is digitized,encoded, and sent via a radiation-hard gigabit transceiverand an optical linkto the back-end electronics for analysis. This paper reports on the updated design of the FBCMdetector and the ongoing testing program.
Copyright/License	CC-BY-4.0 publication: © 2024 The authors preprint: (License: arXiv nonexclusive-distrib 1.0)

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