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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Photomultiplier Tubes"”.
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Magnetic Field Shielding For the Forward Time of Flight Upgrade At Jefferson National Lab
… Lab's 12GeV upgrade. The counters, consisting of photomultiplier tubes attached to the ends of scintillation bars of varying lengths, record the time of flight for particles inside the Continuous Electron Beam Accelerator Facility (CEBAF) Large Acceptance Spectrometer (CLAS). These detectors must …
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Dark noise calibration of the Super-Kamiokande outer detector
… used optic fibers to expose the detector's photomultiplier tubes to known amounts of light in order to determine the signal response to one photoelectron. This process was long and required data collection to halt during calibration. The new technique makes use of the background noise hits …
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A novel high-efficiency SiPM-based system for Ps-TOF
… Time Of Flight is proposed, using Silicon Photomultipliers (SiPMs) instead of Photomultiplier Tubes. The solution allows us to dramatically increase the compactness of the set up, thus improving the efficiency of 240%. Different configurations of SiPM+scintillators are characterized in …
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Development of an Optical System for Measuring Fluorescence Lifetimes
… such as other avalanche photodiodes (APD) or photomultiplier tubes (PMTs).
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The design and development of Prometheus 1: Rice University's coded aperture faint object gamma ray telescope
… blocks viewed separately by one or more photomultiplier tubes acting in anticoincidence with the central detector, providing excellent isolation from non-source gamma ray detections. The telescope uses a coded aperture approach yielding an overall geometrical spatial resolution of …
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Optical properties and surface activities of thin metallic films deposited in ultra high vacua
… in vacua and in air by direct measurement using photomultiplier tubes. All the measurements were made at nearly normal incidence with a monochromatic light beam of wavelength 4358 A. It was found that the reflectivity of films of both copper and silver decreased as they were exposed to air. The …
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Changes of some optical constants of thin metallic films due to exposure to gases
… using the photoelectric method, with two photomultiplier tubes (931-A and 1P21), and were made at an angle of incidence of zero degrees for two different wavelengths (4047 A and 4358 A). The gases used were air, argon, nitrogen and oxygen. The use of oxygen required several changes in the …
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Shock initiation of explosives under the microscope
… detailed. The system consists of 32 individual photomultiplier tubes to which light is fed through a prism spectrograph with fiber optic coupling. These photomultiplier tubes collect the spectrally-dispersed light and record intensity with a high range of linearity to a digitizing oscilloscope. …
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The evaluation and the application of array detectors for analytical luminescence spectroscopy.
… to the most sensitive single channel detectors; photomultiplier tubes (PMT). The results from the application of the CCD detector system to molecular spectroscopies (fluorescence, chemiluminescence, fluorescence detection of high performance liquid chromatography (HPLC) effluents, and …
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Current profile measurements using MSE on Alcator C-Mod
… major hardware upgrades include replacement of photomultiplier tubes (PMT's) with avalanche photodiodes (APD's) which enhanced the quantum efficiency; installation of a wire-grid polarizer to verify small Faraday rotation in the diagnostic; installation of steep edge filters to minimize …
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Photomultiplier tube calibration for the Cubic Meter Dark Matter Time Projection Chamber
This thesis concerns measurements I performed on photomultiplier tubes (PMTs) and lenses to be used in the Cubic Meter Dark Matter Time Projection Chamber (DMTPC) experiment. DMTPC is a new generation of detector, which takes the idea of a standard time projection chamber and adds in some …
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Gamma Veto Detectors in the KOPIO Experiment
… of the magnetic field so it can be read by photomultiplier tubes resting outside of the sweeping magnet.
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The Gamma Intensity Monitor at the Crystal-Barrel-Experiment
… lepton pairs is measured with industrial photomultiplier tubes to provide an effective efficiency close to unity. Special bases were built for photomultiplier to ensure stable signal amplication even high count rates. Detailed descriptions of the GIM are provided to ensure that its inner …
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Extreme universe space observatory on a super pressure balloon II fluorescence telescope on the ground and (briefly) in the air, The
… The Cherenkov Telescope, utilizing silicon photomultipliers with a fast digitization, designed to detect Earth-skimming neutrinos of astrophysical origin, aimed to measure background signatures for such observations as well as high energy cosmic rays above the limb. The fluorescence …
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Analysis of vacuum and argon gas fill data from the MiniCLEAN dark matter experiment
… fluor tetraphenyl butadiene and cryogenic photomultiplier tubes for light detection. The active spherical region of the detector contains 500 kg of liquid argon at temperature 87 K. Background events which could mimic a WIMP signal are mitigated through pulse-shape discrimination and …
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Remote detection of fissile material : Cherenkov counters for gamma detection
… are detected with six 8" hemispherical Hamamatsu photomultiplier tubes (PMT). PMTs are calibrated using two monoenergetic LEDs. The detector was shown to successfully detect gamma rays of energies above the Cherenkov threshold. The detector was able to discriminate between various sources, such as …
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Combustion dynamics of metal powders in mixed gas flows
… experimental data collection includes filtered photomultiplier tubes which capture particle emission durations that represent the particle burn times. The particle burn times are correlated with the particle size distribution to obtain the burn time as a function of the particle size assuming …
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Development of a simulation environment for the analysis and the optimal design of fluorescence detectors based on single photon avalanche diodes
… detectors a good alternative to conventional photomultiplier tubes and micro-channel plates. CMOS technology allows cointegration of a SPAD and electronic circuits on the same substrate and provides advantages in time resolution and noise characteristics. Monolithic integration of signal …
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An innovative portable detector for the live-monitoring of radionuclides in small terrestrial animals
… to maximise detection from the organism. Four photomultiplier tubes collect light from the scintillators and a single channel analyser provides signal processing. Surrounding the detection materials is a lead shield designed to give an optimal balance between portability and background …
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Fisher Information in X-ray/Gamma-ray Imaging Instrumentation Design
… in a detector system based on multi-anode photomultiplier tubes coupled to a monolithic scintillator in the design of smart electronic read-out strategies. We conclude by arguing that a detector system is expected to perform the best when the hardware is optimized jointly with the …
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