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  • 1
    In: Journal of Synchrotron Radiation, 01 September 2016, Vol.23(5), pp.1171-1179
    Description: A prototype ePix100 detector was used in small‐angle scattering geometry to capture speckle patterns from a static sample using the Linac Coherent Light Source (LCLS) hard X‐ray free‐electron laser at 8.34 keV. The average number of detected photons per pixel per pulse was varied over three orders of magnitude from about 23 down to 0.01 to test the detector performance. At high average photon count rates, the speckle contrast was evaluated by analyzing the probability distribution of the pixel counts at a constant scattering vector for single frames. For very low average photon counts of less than 0.2 per pixel, the `droplet algorithm' was first applied to the patterns for correcting the effect of charge sharing, and then the pixel count statistics of multiple frames were analyzed collectively to extract the speckle contrast. Results obtained using both methods agree within the uncertainty intervals, providing strong experimental evidence for the validity of the statistical analysis. More importantly it confirms the suitability of the ePix100 detector for X‐ray coherent scattering experiments, especially at very low count rates with performances surpassing those of previously available LCLS detectors. A prototype unit of the ePix100 camera was used for coherent scattering studies at the Linac Coherent Light Source. The performance of the detector was tested over a broad range of incident flux from 23 down to 0.01 photons per pixel on average.
    Subject(s): X‐Rays ; Free‐Electron Laser Fel ; Detector ; Droplet Algorithm ; Coherent Scattering
    ISSN: 1600-5775
    E-ISSN: 1600-5775
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  • 2
    Dissertation
    Dissertation
    2010
    ISBN: 978-1-124-55264-4 
    Language: English
    In: ProQuest Dissertations and Theses
    Description: The decay of a B meson into an η' meson and an inclusive charmless state with unit strangeness, B → Xsη', has stimulated significant theoretical interest since it was first observed in 1998. A number of models were proposed to explain the unexpectedly large branching fraction and the spectrum of X s mass, which peaks above 2.0 GeV/c². One of the most initially appealing explanations was the QCD anomaly model, in which the η' couples strongly to two gluons. However, despite a number of theoretical calculations and improved measurements of the decay, no explanation has been universally accepted as accounting for available experimental data. The unique relationship between the η' and the η suggest that the complimentary decay, B → Xsη, could elucidate the nature of the Xsη' process. We report the first measurement of inclusive B → Xsη decays, based on a pseudo-inclusive reconstruction technique using a sample of 657 × 106 BB¯ pairs accumulated with the Belle detector at the KEKB e +e− collider....
    Subject(s): Particle Physics ; Particle Physics ; Pure Sciences ; B Meson ; Belle Detector ; ETA ; Inclusive Decay
    ISBN: 978-1-124-55264-4
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
    Source: ProQuest Dissertations & Theses Global: The Sciences and Engineering Collection
    Source: ProQuest Dissertations and Theses Global A&I: The Sciences and Engineering Collection
    Source: ProQuest Dissertations & Theses Full Text
    Source: ProQuest Dissertations & Theses A&I
    Source: ProQuest Dissertations & Theses: Global
    Source: ProQuest One Academic
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  • 3
    In: Journal of Synchrotron Radiation, 01 May 2015, Vol.22(3), pp.577-583
    Description: Free‐electron lasers (FELs) present new challenges for camera development compared with conventional light sources. At SLAC a variety of technologies are being used to match the demands of the Linac Coherent Light Source (LCLS) and to support a wide range of scientific applications. In this paper an overview of X‐ray detector design requirements at FELs is presented and the various cameras in use at SLAC are described for the benefit of users planning experiments or analysts looking at data. Features and operation of the CSPAD camera, which is currently deployed at LCLS, are discussed, and the ePix family, a new generation of cameras under development at SLAC, is introduced.
    Subject(s): Fel ; X‐Ray ; Detectors ; Fast Readout
    ISSN: 1600-5775
    ISSN: 09090495
    E-ISSN: 1600-5775
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  • 4
    Language: English
    In: 2012 18th IEEE-NPSS Real Time Conference, June 2012, pp.1-6
    Description: Searches for radio signatures of ultra-high energy neutrinos and cosmic rays could benefit from improved detection efficiency by using real-time beamforming or correlation triggering. For missions with power limitations, such as the ANITA-3 Antarctic balloon experiment, full speed high resolution digitization of incoming signals is not practical at the trigger level. To this end, the University of Hawaii has developed the Realtime Independent Three-bit Converter (RITC), a 3-channel, 3-bit, streaming analog-to-digital converter implemented in the IBM 0.13 μm CMOS process. RITC is primarily designed to digitize broadband radio signals produced by the Askaryan effect, and thus targets an analog bandwidth of 〉;1 GHz, with a sample-and-hold architecture capable of storing up to 2.6 gigasamples-per-second. An array of flash analog-to-digital converters perform 3-bit conversion of sets of stored samples while acquisition continues elsewhere in the sampling array. A serial interface is provided to access an array of on-chip digital-to-analog converters that control the digitization thresholds for each channel as well as the overall sampling rate. Demultiplexed conversion outputs are read out simultaneously for each channel via a set of 36 LVDS links, each running at 650 Mb/s. We briefly describe the design architecture of RITC, and report preliminary results of performance characterization, including prospects for the use of this architecture as the analog half of a novel triggering system for the ANITA-3 ultra-high energy neutrino experiment.
    Subject(s): Threshold Voltage ; Timing ; Clocks ; Noise ; Array Signal Processing ; Broadband Antennas ; Arrays ; Computer Science
    ISBN: 9781467310826
    ISBN: 1467310824
    Source: IEEE Conference Publications
    Source: IEEE Xplore
    Source: IEEE Journals & Magazines 
    Source: IEEE eBooks
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  • 5
    Language: English
    In: AIP Advances, March 2019, Vol.9(3)
    Description: We present Monte Carlo (MC) simulation results from a study of a compact plastic-scintillator detector suitable for imaging fast neutrons in the 1 – 10 MeV energy range: the miniTimeCube (mTC). Originally designed for antineutrino detection, the mTC consists of 24 MultiChannel Plate (MCP) photodetectors surrounding a 13 cm cube of boron-doped plastic scintillator. Our simulation results show that waveform digitization of 1536 optically sensitive channels surrounding the scintillator should allow for spatiotemporal determination of individual neutron-proton scatters in the detector volume to ∼ 100 picoseconds and ∼5 mm. A Bayesian estimation framework is presented for multiple-scatter reconstruction, and is used to estimate the incoming direction and energy of simulated individual neutrons. Finally, we show how populations of reconstructed neutrons can be used to estimate the direction and energy spectrum of nearby simulated neutron sources.
    Subject(s): Regular Articles
    E-ISSN: 2158-3226
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  • 6
    Language: English
    In: ProQuest Dissertations and Theses
    Description: The WATer CHerenkov Monitor for ANtineutrinos (WATCHMAN), is a new detector concept for nuclear non-proliferation monitoring. WATCHMAN will use inverse beta decay reactions in its gadolinium-doped water tank to detect the low energy antineutrinos from nuclear reactions. The detector consists of a 5 kiloton water tank instrumented with around 3600 photomultiplier tubes. This thesis presents the design, simulation and testing of the TARGETC ASIC-based FPGA Mezzanine Card (FMC) Prototype as a demonstration that a TARGET solution will satisfy WATCHMAN's readout requirements. The TARGETC FMC Prototype is a cost-effective data acquisition system that can handle a large number of photomultiplier tubes while digitizing the signals at a high sampling rate. The system uses the TARGETC ASIC, developed by the University of Hawaii as a multi-channel transient waveform digitizer. Employing a commercial System-On-Module with a Zynq-based FPGA, the TARGETC FMC Prototype system offers a self-triggered,...
    Subject(s): Physics ; Physics ; Antineutrinos ; Detector ; Target ; Targetc ; Watchman
    ISBN: 9781658401661
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
    Source: ProQuest Dissertations & Theses Global: The Sciences and Engineering Collection
    Source: ProQuest Dissertations and Theses Global A&I: The Sciences and Engineering Collection
    Source: ProQuest Dissertations & Theses Full Text
    Source: ProQuest Dissertations & Theses A&I
    Source: ProQuest Dissertations & Theses: Global
    Source: ProQuest One Academic
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  • 7
    Language: English
    Description: The Bell Detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider performed extremely well, logging an integrated luminosity an order of magnitude higher than the design baseline. With this inverse attobarn of integrated luminosity, time-dependent CP-violation inn the 3rd generation beauty quarks was firmly established, and is now a precision measurement. Going beyond this to explore if the Kobayashi-Maskawa mechanism is the only contributor to quark-mixing, and to interrogate the flavor sector for non-standard model enhancements, requires a detector and accelerator capable of topping this world-record luminosity by more than an order of magnitude. The Belle II detector at the upgraded Super-KEKB accelerator has been designed to meet this highly ambitious goal of operating at a luminosity approaching 10{sup 36} cm{sup -2} s{sup -1}. Such higher event rates and backgrounds require upgrade of essentially all detector subsystems, as well as their readout. Comparing the Belle composite (threshold Aerogel + Time of Flight) particle identification (PID) system with the DIRC employed by BaBar, quartz radiator internal Cherenkov photon detection proved to have higher kaon efficiency and lower pion fake rates. However, because the detector structure and CsI calorimeter will be retained, an improved barrel PID must fit within a very narrow envelope, as indicated in Figure 1. To effectively utilize this space, a more compact detector concept based on the same quartz radiators, but primarily using photon arrival time was proposed. This Time Of Propagation (TOP) counter was studied in a number of earlier prototype tests. Key to the necessary 10's of picosecond single-photon timing has been the development of the so-called SL-10 Micro-Channel Plate Photo-Multiplier Tube (MCP-PMT), which has demonstrated sub-40 ps single photon Transit Time Spread TTS. Further simulation study of this detector concept indicated that a focusing mirror in the forward direction, as well as a modest image expansion volume and more highly pixelated image plane improve the theoretical detector performance, since timing alone is limited by chromatic dispersion of the Cherenkov photons. This imaging-TOP (or iTOP) counter is the basis of Belle II barrel PID upgrade. However, a number of critical performance parameters must be demonstrated prior to releasing this prototype design for production manufacture.
    Subject(s): Pions ; Quartz ; Photons ; Calorimeters ; Luminosity ; 43 Particle Accelerators ; Quarks ; Radiators Experiment-Hep ; Efficiency ; Mirrors ; Detection ; 72 Physics Of Elementary Particles And Fields ; Focusing ; Plates ; Accelerators ; Particle Identification ; Kaons ; Accuracy ; Experiment-Hep
    Source: University of North Texas
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