Radioactive source calibration test of the CMS Hadron Endcap Calorimeter test wedge with Phase I upgrade electronics
Author(s)Brandt, Stephanie Akemi; D'Alfonso, Mariarosaria; Hu, Miao; Klute, Markus; Niu, Xinmei; CMS HCAL Collaboration; ... Show more Show less
MetadataShow full item record
The Phase I upgrade of the CMS Hadron Endcap Calorimeters consists of new photodetectors (Silicon Photomultipliers in place of Hybrid Photo-Diodes) and front-end electronics. The upgrade will eliminate the noise and the calibration drift of the Hybrid Photo-Diodes and enable the mitigation of the radiation damage of the scintillators and the wavelength shifting fibers with a larger spectral acceptance of the Silicon Photomultipliers. The upgrade also includes increased longitudinal segmentation of the calorimeter readout, which allows pile-up mitigation and recalibration due to depth-dependent radiation damage. As a realistic operational test, the responses of the Hadron Endcap Calorimeter wedges were calibrated with a 60 Co radioactive source with upgrade electronics. The test successfully established the procedure for future source calibrations of the Hadron Endcap Calorimeters. Here we describe the instrumentation details and the operational experiences related to the sourcing test.
DepartmentMassachusetts Institute of Technology. Department of Physics
Journal of Instrumentation
Chatrchyan, S. et al. "Radioactive source calibration test of the CMS Hadron Endcap Calorimeter test wedge with Phase I upgrade electronics." Journal of Instrumentation 12 (December 2017): P12034 © 2017 CERN for the benefit of the CMS collaboration
Final published version