44 research outputs found

    A TIME-SHARED COMPUTER DATA COLLECTION SYSTEM AT THE BROOKHAVEN GRAPHITE RESEARCH REACTOR

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    The on-line system for simultaneous data collection from two physically unrelated neutron time-of-flight experiments is described. A transistorized, digital computer with a 2048, 24 bit word memory provides 1024 and 256channel time analyzers, clocks, and total events and monitor scalers for fast and slow neutron chopper experiments, respectively. (D.C.W.

    The PHENIX Experiment at RHIC

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    The physics emphases of the PHENIX collaboration and the design and current status of the PHENIX detector are discussed. The plan of the collaboration for making the most effective use of the available luminosity in the first years of RHIC operation is also presented.Comment: 5 pages, 1 figure. Further details of the PHENIX physics program available at http://www.rhic.bnl.gov/phenix

    Application of Silicon Photomultipliers to Positron Emission Tomography

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    Historically, positron emission tomography (PET) systems have been based on scintillation crystals coupled to photomultipliers tubes (PMTs). However, the limited quantum efficiency, bulkiness, and relatively high cost per unit surface area of PMTs, along with the growth of new applications for PET, offers opportunities for other photodetectors. Among these, small-animal scanners, hybrid PET/MRI systems, and incorporation of time-of-flight information are of particular interest and require low-cost, compact, fast, and magnetic field compatible photodetectors. With high quantum efficiency and compact structure, avalanche photodiodes (APDs) overcome several of the drawbacks of PMTs, but this is offset by degraded signal-to-noise and timing properties. Silicon photomultipliers (SiPMs) offer an alternative solution, combining many of the advantages of PMTs and APDs. They have high gain, excellent timing properties and are insensitive to magnetic fields. At the present time, SiPM technology is rapidly developing and therefore an investigation into optimal design and operating conditions is underway together with detailed characterization of SiPM-based PET detectors. Published data are extremely promising and show good energy and timing resolution, as well as the ability to decode small scintillator arrays. SiPMs clearly have the potential to be the photodetector of choice for some, or even perhaps most, PET systems

    A Combined Current Indicator and Integrator

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    A combined current indicator and integrator /

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    Work performed at the Brookhaven National Laboratory."March 30, 1951; [TIS Issuance Date]"Mode of access: Internet

    Scientific Applications: BRAD

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