Czochralski Silicon as a Detector Material for S-LHC Tracker Volumes

• Published in: arXiv.org 2010-08
• Main Authors: Spiegel, Leonard, Barvich, Tobias, Burt Betchart, Bhattacharya, Saptaparna, Czellar, Sandor, Demina, Regina, Dierlamm, Alexander, Frey, Martin, Gotra, Yuri, Härkönen, Jaakko, Hartmann, Frank, Kassamakov, Ivan, Korjenevski, Sergey, Kortelainen, Matti J, Lampén, Tapio, Mäenpää, Teppo, Moilanen, Henri, Narain, Meenakshi, Neuland, Maike, Orbaker, Douglas, Simonis, Hans-Jürgen, Steck, Pia, Tuominen, Eija, Tuovinen, Esa
• Format: Article
• Language: English
• Subjects: Charge efficiency; Detectors; Large Hadron Collider; Luminosity; Neutron sources; Neutrons; Silicon; Solenoids
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1008.4107

With an expected ten-fold increase in luminosity in S-LHC, the radiation environment in the tracker volumes will be considerably harsher for silicon-based detectors than the already harsh LHC environment. Since 2006, a group of CMS institutes, using a modified CMS DAQ system, has been exploring the use of Magnetic Czochralski silicon as a detector element for the strip tracker layers in S-LHC experiments. Both p+/n-/n+ and n+/p-/p+ sensors have been characterized, irradiated with proton and neutron sources, assembled into modules, and tested in a CERN beamline. There have been three beam studies to date and results from these suggest that both p+/n-/n+ and n+/p-/p+ Magnetic Czochralski silicon are sufficiently radiation hard for the \(R>25\) cm regions of S-LHC tracker volumes. The group has also explored the use of forward biasing for heavily irradiated detectors, and although this mode requires sensor temperatures less than -50\,\(^\circ\)C, the charge collection efficiency appears to be promising.