Abstract
The CMS experiment at the Large Hadron Collider at CERN is upgrading the photo-detection and readout system of the forward hadronic calorimeter. The phase 1 upgrade of the CMS forward calorimeter requires the replacement of the current photomultiplier tubes, as well as the installation of a new front-end readout system. The new photomultiplier tubes contain a thinner window as well as multi-anode readout. The front-end electronics will use the QIE10 ASIC which combines signal digitization with timing information. The major components of the upgrade as well as the current status are described in this paper.
Highlights
Upgrade of the photomultiplier tubesThe upgrade of the photomultiplier tubes involves the replacement of the current Hamamatsu R7525 phototubes with Hamamatsu R7600U-200-M4 quad-anode PMTs. In order to reduce the number of readout channels required while still gaining the benefits of having multiple anodes per PMT, the PMTs will be readout through two channels instead of four
The CMS experiment at the Large Hadron Collider at CERN is upgrading the photo- detection and readout system of the forward hadronic calorimeter
The major components of the upgrade as well as the current status are described in this paper
Summary
The upgrade of the photomultiplier tubes involves the replacement of the current Hamamatsu R7525 phototubes with Hamamatsu R7600U-200-M4 quad-anode PMTs. In order to reduce the number of readout channels required while still gaining the benefits of having multiple anodes per PMT, the PMTs will be readout through two channels instead of four. This will lead to an asymmetric signal between the outputs of the PMT anodes. The multiple readout channels of the PMTs will double the number of output channels on the detectors This requires an upgrade of the front-end electronics in order to be able to read out the additional channels. It contains an analog-to-digital converter (ADC) for digitizing the pulse heights and
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