Abstract
A readout box prototype for the CMS Hadron Forward calorimeter upgrade was built and tested in the CERN H2 beamline. The prototype was designed to enable simultaneous tests of different readout options for the four anode upgrade PMTs, new front-end electronics design and new cabling. The response of the PMTs with different readout options was uniform and the background response was minimal. Multi-channel readout options further enhanced the background elimination. Passing all the electronic, mechanical and physics tests, the readout box proved to be capable of providing the forward hadron calorimeter operational requirements in the upgrade era.
Highlights
The Compact Muon Solenoid (CMS) [1] is a general-purpose detector designed to run at the highest luminosity provided by the CERN Large Hadron Collider (LHC)
Within the CMS Hadron Forward (HF) Upgrade framework, a prototype readout box, which consists of specific designs of readout boards and cabling, and the new four-anode upgrade photomultiplier tubes (PMTs), was built
The readout box was extensively tested in two beam test campaigns in Summer - Fall 2011 at the CERN H2 beamline
Summary
The Compact Muon Solenoid (CMS) [1] is a general-purpose detector designed to run at the highest luminosity provided by the CERN Large Hadron Collider (LHC). The photomultiplier tubes (PMTs) of CMS HF calorimeter generate a large, fake signal when the PMT window is traversed by a relativistic charged particle due to Cerenkov light production at the PMT window. This alreadyknown problem was observed in 2010 and 2011 data of CMS to degrade data quality and to constitute a potential to interfere with rare physics events. The new readout boards provide the flexibility to switch between four-channel, two-channel and single-channel readout of the four anode PMTs where the four-channel readout option enables the full multi-anode functionality Both internal and external cabling of the RBX are specific designs and selections, an integral part of the prototype. We describe the details of certain performance tests of the RBX and report on the compatibility of the new RBX to the CMS HF upgrade framework
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