Design and test beam studies for the CASTOR calorimeter of the CMS experiment
20103 pages
Published in:
- Nucl.Instrum.Meth.A 623 (2010) 225-227
Contribution to:
Experiments:
View in:
Citations per year
Abstract: (Elsevier)
CASTOR is a calorimeter designed for the very forward region of the CMS experiment at the LHC: 5.2<@h<6.6. The space inside a shielding, the radiation level (2-20kGy) and the magnetic field (0.1-0.16T) constrain the design. A sampling structure of tungsten and quartz plates together with a Cherenkov light readout by air filled light guides and fine mesh photomultipliers (PMT) handle this rough environment and allow a 10 @l_I deep calorimeter. The electronics has to deal with a high occupancy and a high dynamic range (10^4) to measure minimum ionizing particles and full beam energy (7TeV) jets. The charge of the PMT's is digitized for every bunch crossing (25ns) and sent as 1.6Gbit/s streams via 78 optical links to the service cavern. There FGPA's calculate trigger bits, buffer the data and communicate with the CMS systems. A granularity of 224 channels allows to reconstruct shower profiles. Electrons, hadrons and muons have been measured in test beams. The optical response has been extracted to be ~9-12 photoelectrons(ph.e.)/readout-unit for muons, ~30ph.e./GeV for electrons and ~13ph.e./GeV for high energetic pions.- Tungsten/quartz sampling calorimeter
- Cherenkov detector
- CMS
- LHC
References(5)
Figures(0)