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Operational Experience with Radioactive Source Calibration of the CMS Hadron Endcap Calorimeter Wedges with Phase I Upgrade Electronics
- Burak BILKI
- Burak BILKI (U)
- Pawel DE BARBARO (University of Rochester)
- Danila TLISOV (Institute for Nuclear Research, Moscow, Russia)
- Maria TOMS (Institute for Theoretical and Experimental Physics, Moscow, Russia)
- Andrei GRIBUSHIN (Moscow State University)
- Ianos SCHMIDT (University of Iowa)
- Seth COOPER (University of Alabama)
- Vladimir ANDREEV (P.N. Lebedev Physical Institute, Moscow, Russia)
- Stepan OBRAZTSOV (Moscow State University)
- Alexander KAMINSKIY (Moscow State University)
- Pavel BUNIN (Joint Institute for Nuclear Research)
- Caleb SMITH (Baylor University)
- Andrea BENAGLIA (Princeton University)
- Paolo RUMERIO (University of Alabama)
- Jay DITTMANN (Baylor University)
- Joshua KUNKLE (University of Maryland)
The Phase I Upgrade of the CMS Hadron Endcap Calorimeters consist of new photodetectors (Silicon Photomultipliers in place of Hybrid Photo-Diodes ) and front-end electronics (QIE11). The upgrade will allow the elimination of the high amplitude noise and drifting response of the Hybrid Photo-Diodes, at the same time enabling 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 will also allow to increase the longitudinal segmentation of the readout to be beneficial for pile-up mitigation and recalibration due to depth-dependent radiation damage.
As a realistic operational exercise, the responses of the Hadron Endcap Calorimeter wedges are being calibrated with a 60Co radioactive source both with current and upgrade electronics. The exercise will provide a manifestation of the benefits of the upgrade. Here we describe the instrumentation details and the operational experiences related to the sourcing exercise.