CMS Level 1 Calorimeter Trigger Performance on Technical Proposal Physics
We examine the eeciency and rates of the CMS Calorimeter Level 1 Trigger as presented in the CMS Technical Proposal for selecting the events needed for use in the CMS physics program described in the Proposal. Speciic signals investigated include top decays to electrons, Standard Model Higgs decays to electrons and photons, signals from SUSY Higgs, and Gluino production. A variety of masses and SUSY parameters are investigated. The eeciencies are studied at the luminosity 10 33 cm ?2 s ?1 or 10 34 cm ?2 s ?1 depending on the expected rate of events as assumed in the CMS Technical proposal. A single set of Level 1 Calorimeter energy thresholds for electrons, jets and missing energy is selected to provide a 15 kHz rate at each of the two luminosity settings considered. It is shown that this set of cuts provides suuciently high eeciency and satisses CMS physics goals as stated in the Technical Proposal. We also explore the rate of B Physics signals that pass this high p t trigger.
CMS Level-1 Calorimeter Trigger Detailed Simulation
CMS level-1 calorimeter trigger simulation results are discussed. The simulation results are obtained using CMSIM version 111 program based on the GEANT simulation of the detector. These CMSIM results compare favorably to the results from our fast simulation program used in earlier studies. Both these results indicate that the rate requirements of the data acquisition system can be met with a reasonable safety factor of three while providing high efficiencies for high ET physics processes of interest to CMS. Electron Identification Card 160 MHz Point-to-point Backplane Receiver Card VME P r o c e s s o r M O N I T O R EI EI EI EI EI EI EI EI JS CC S P A R E Figure 1: CMS level-1 calorimeter regional trigger crate which houses eight Receiver and eight Electron Identification Cards that share data via the 160 MHz point-to-point links on the backplane. The Jet/Summary card at the center of the crate provides the crate output to the global level-1 calorimeter and muon trigger crates.
Time behavior of gas pressure and PD activity in insulation cavities under AC voltage
In the framework of developing defect-based life models (i.e. the life model of partial discharge-induced damage growth from a micro-void in polymer matrix), ageing tests were performed on PE layered specimens with artificial cavities under constant gas pressure and constant gas volume conditions, respectively. Time behavior of the discharge repetition rate and amplitude were recorded and compared under these two conditions. Results show that pressure variation has little influence on PD activities at constant gas volume. Under constant gas pressure, the evolution of gas volume has similar characteristic to the product of discharge amplitude and repetition rate.