Abstract
As part of its HL-LHC upgrade program, the CMS collaboration is developing a High Granularity Calorimeter (CE) to replace the existing endcap calorimeters. The CE is a sampling calorimeter with unprecedented transverse and longitudinal readout for both electromagnetic (CE-E) and hadronic (CE-H) compartments. The calorimeter will be built with ∼30,000 hexagonal silicon modules. Prototype modules have been constructed with 6-inch hexagonal silicon sensors with cell areas of 1.1 cm2, and the SKIROC2-CMS readout ASIC. Beam tests of different sampling configurations were conducted with the prototype modules at DESY and CERN in 2017 and 2018. This paper describes the construction and commissioning of the CE calorimeter prototype, the silicon modules used in the construction, their basic performance, and the methods used for their calibration.
Highlights
Granularity Calorimeter (CE) to replace the existing endcap calorimeters
Prototype modules have been constructed with 6-inch hexagonal silicon sensors with cell areas of 1.1 cm2, and the SKIROC2-CMS readout ASIC
This paper describes the construction and commissioning of the CE calorimeter prototype, the silicon modules used in the construction, their basic performance, and the methods used for their calibration
Summary
The silicon sensor is glued to the gold layer of the KaptonTM sheet with a silver epoxy to provide the electrical connection. The wire bonds provide the electrical connection between the silicon sensor cells and the PCB. The first, called ‘double KaptonTM’ is shown in Figure 5 (left) It contains a second gold plated KaptonTM sheet epoxied to the first one. Linear fit, 0-150 V estimated depleted capacitance: 42.7 pF estimated depletion voltage: 188.7 V
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