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The components of the SLD barre1 Cerenkov Ring Imaging Detector (GRID) are now built and are being installed. We report on tests of these, including tests of the fiber optic calibration system, detailed studies of electron drift paths on production drift boxes and detectors, tests of the dynamic gating system and its effect on drift path distortions due to space-charge, and a measurement of the...

Using a system of four GEMs operating in tandem and coupled to pad readout, we have demonstrated the detection of single electrons in ethane at 1 bar. The paper presents measurements of single electron pulse height distributions, total gas gain measurement and calculation, pad-to-pad cross-talk, quenching capability, high rate capability, charging effects, etc. We describe the overall operation...

The Barrel CRID detector has been operating successfully at SLD for the past 7 years. It is an important tool for SLD physics analyses. We report results based on long term operational experience of a number of important quantities such as the Cherenkov quality factor, No, of the device, fluid transparency, electron lifetime, single electron detection efficiency, anode wire ageing,TMAE purity, ...

We report a new measurement of A b using data obtained by SLD in 1997-98. This measurement uses a vertex tag technique, where the selection of a b hemisphere is based on the reconstructed mass of the bottom hadron decay vertex. The method uses the 3D vertexing capabilities of SLD's CCD vertex detector and the small and stable SLC beams to obtain a high b-event tagging efficiency and purity of 7...

We describe the front-end electronics for the Cherenkov Ring Imaging Detector (CRID) of the SLD at the Stanford Linear Accelerator Center. The design philosophy and implementation are discussed with emphasis on -the low-noise hybrid amplifiers, signal processing and _ data acquisition electronics. The system receives signals from a highly efficient single-photo electron detector. These signals ...

Platelet functions such as aggregation and clot retraction are often abnormal in chronic mylogenous leukemia (CML) patients. However, the molecular mechanisms of these altered functions are unknown. As expression of the p210bcr-abl oncogene product, a constitutively active tyrosine kinase, is known to have an essential role in the pathogenesis of CML and tyrosine phosphorylation is intimately i...

Many satisfiability problems called structured SAT problems (like Ramsey, PigeonHole, and so on) may be very shortly defined with Score(FD/B), a boolean constraint programming language design at the Computer Research Center of Dijon (CRID). In addition to the expressiveness, design features of the language (cardinality constraints) are also used to detect some properties (symmetries) of the pro...