15246775
Prototype Readout Module for the ATLAS Level-1 Calorimeter Trigger Processors
The level-1 calorimeter trigger consists of three subsystems, namely the Preprocessor, electron/photon and tau/hadron Cluster Processor (CP), and Jet/Energy-sum Processor (JEP). The CP and JEP will receive digitised calorimeter trigger-tower data from the Preprocessor and will provide trigger multiplicity information to the Central Trigger Processor and region-of-interest (RoI) information for the level-2 trigger. It will also provide intermediate results to the data acquisition (DAQ) system for monitoring and diagnostic purposes. This paper will outline a readout system based on FPGA technology, providing a common solution for both DAQ readout and RoI readout for the CP and the JEP. Results of building a prototype readout driver (ROD) module will be presented, together with results of tests on its integration with level-2 and DAQ modules.
27359669
The ATLAS level-1 calorimeter trigger architecture
The architecture of the ATLAS Level-1 Calorimeter Trigger system (L1Calo) is presented. Common approaches have been adopted for data distribution, result merging, readout, and slow control across the three different subsystems. A significant amount of common hardware is utilized, yielding substantial savings in cost, spares, and development effort. A custom, high-density backplane has been developed with data paths suitable for both the em//spl tau/ cluster processor (CP) and jet/energy-summation processor (JEP) subsystems. Common modules also provide interfaces to VME, CANbus and the LHC timing, trigger and control system (TTC). A common data merger module (CMM) uses field-programmable gate arrays (FPGAs) with multiple configurations for summing electron/photon and /spl tau//hadron cluster multiplicities, jet multiplicities, or total and missing transverse energy. The CMM performs both crate- and system-level merging. A common, FPGA-based readout driver (ROD) is used by all of the subsystems to send input, intermediate and output data to the data acquisition (DAQ) system, and region-of-interest (RoI) data to the level-2 triggers. Extensive use of FPGAs throughout the system makes the trigger flexible and upgradable, and several architectural choices have been made to reduce the number of intercrate links and make the hardware more robust.
122602157
Electron--positron inclusive hadron reactions
I would like to present some of the preliminary results of an experiment studying e+-e− interactions at the SPEAR colliding beam facility at SLAC. This experiment was predominately a single arm magnetic spectrometer for measuring e+-e− inclusive cross sections.
122765043
A silicon strip vertex detector for the Mark II experiment at the SLAC linear collider
The design and status of a silicon strip vertex detector for the Mark II experiment at the SLAC Linear Collider are described.
122012769
The SVX II silicon vertex detector upgrade at CDF
Abstract The SVX vertex detector has been very successful in heavy flavor physics at CDF, playing a significant role in both top and bottom analyses. SVX′, a radiation hard version of SVX, is presently taking data. In 1998 the Main Injector upgrade to the accelerator complex at Fermilab will provide a significant increase in luminosity, and will require a new vertex detector, SVX II. The specifications and design considerations for this detector are discussed.
9876488
An alignment method for the mark II silicon strip vertex detector using an X-ray beam
Abstract Silicon strip vertex detector consisting of 36 independent detector modules is being constructed for use in the Mark II detector at a SLAC Linear Collider. This paper describes a method for determining the relative alignment of the modules to a precision better than the 5 μm intrinsic resolution of the detectors. The basic procedure involves moving the vertex detector by known amounts through a fixed, collimated X-ray beam, and using the beam position reconstructed from the detected signals to determine the relative positions and orientations of the modules. Results from tests of the method on a subset of detectors are presented.
118211383
Inclusive particle production and anomalous muons in e+e− collisions at spear
Results are presented on hadron and muon inclusive production in e+e− collisions at √s=3.8 and 4.8 GeV. Anomalously large high momentum muon production is observed in noncoplanar two charged particle final states, but no anomalies are seen in multicharged particle final states. Arguments are presented that these extra muons do not come from charmed particles but could possibly come from heavy leptons. Results are also presented on a search for e+e− narrow resonances with 5.7 GeV<Mee<6.1 GeV. The T(5.97) was not seen in this scan which means that ree<100 ev. if the T has decay modes similar to the ψ and ψ′.