Calibration and test studies of hadronic forward, hadronic barrel and castor detectors at CMS

In a detector exposed to high flux of particles using optical elements one has to knowthe level of radiation accumulated to calibrate the optical read-out. At the nominal LHCluminosity the dose received by the fibers at h = 5 where HF is placed on CMS detector,will be of 100 Mrad/year. In HF the spectrum of Cerenkov light detected by thePMT?s is centered near 450 nm (blue). The important light transmission variations at thiswavelength due to radiation damage and the fast recovery of it after radiation stops, ledus to monitor online the blue light transmission with dedicated fibers called ?Raddam fibres?.Injecting blue light in a 2.5m long fibre, we used the ratio of the reflected signalat both ends to determine the absorption of the fibre. During the 2006 Raddam devicebeam test, radiation damage and recovery studies of raddam fibers were performed usingLHC-HCAL data acquisition (DAQ).Results of the performance of the second prototype of the CASTOR quartz-tungstensampling calorimeter, to be installed in the very forward region of the CMS experimentat the LHC is also discussed in detail. The spatial resolution of the prototype to electromagneticshowers with E = 100 GeV electrons from beam tests carried out at CERN/SPSin 2004 using avalanche photodiodes APDs are studied.Calibrating and testing Hadron Calorimeter (HCAL) components with cosmic-raymuons is a way for improving our understanding of the detector. The SATOCRICHproject (Special Assignment to Observe Cosmic Rays in CMS HCAL) proposed to collectand analyze the first sample of cosmic-ray events for CMS HCAL. The experimentalsetup and results on energy and time distributions of observed cosmic-ray muon eventsare described. Using cosmic-ray muons preliminary calibration of energy scale of twoHCAL wedges is performed and compared with LED and wire-source data.