SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Mechanisms of penetration and light emission for micrometeoroid impact on an aluminum-coated photomultiplier
Temperature effects in photomultipliers and astronomical photometry
Temperature effects in photomultipliers and astronomical photometry
Modulation of photomultiplier amplification factor in measurement of weak light fluxes
Photomultiplier tube sensitivity enhancement with very thin semitransparent photocathode and total internal reflection
High voltage effect on spectral sensitivity for EMI 6256 and Farnsworth FW-118 photomultiplier
End window photomultiplier tube semitransparent photocathode electron collection efficiency
Environment, static acceleration, vibration, shock, gas contamination, and life tests in development of sterilizable photomultipliers for space programs
Photomultiplier tube socket assembly with high gain and clean output signals for viewing organic scintillator light pulses
Design, construction, and testing of photomultiplier tube amplifier-discriminator system
UV sensitivity increase in sodium salicylate photomultiplier combination
Background noise produced by high energy radiation incident on photomultiplier tube, stressing differences between tubes in number of small pulses produced
Photomultiplier gate for stimulated spontaneous light scattering discrimination, showing high cut- off efficiency, linearity and absence of spurious effect
Noise and dark current reduction in photomultiplier tubes by magnetic defocusing
Ionizing radiation effects on dark current and noise pulse spectrum of photomultiplier tubes used in balloon and satellite X-ray observations
Optical coupling of photomultiplier tube to acrylic plastic using clear silicone potting compound
The cosmic ray veto detector for the Mu2e experiment consists of scintillation bars embedded with wavelength-shifting fibers and read out by silicon photomultipliers (SiPMs). Here, in this manuscript, the calibration procedures of the SiPMs are described including corrections for the temperature dependence of their light yield. These corrections are needed as the SiPMs are not kept at a constant temperature due to the complexity and cost of implementing a cooling system on such a large detector. Rather, it was decided to monitor the temperature to allow the appropriate corrections to be made. The SiPM temperature dependence has been measured in a dedicated experiment and the calibration procedures were validated with data from production detectors awaiting installation at Fermilab.
The temperature of a nonneutral plasma confined in a Penning–Malmberg trap can be determined by slowly lowering one side of the trap’s electrostatic axial confinement barrier; the temperature is inferred from the rate at which particles escape the trap as a function of the barrier height. In many experiments, the escaping particles are directed toward a microchannel plate, and the resulting amplified charge is collected on a phosphor screen. The screen is used for imaging the plasma but can also be used as a Faraday cup (FC) for a temperature measurement. The sensitivity limit is then set by microphonic noise enhanced by the screen’s high-voltage bias. Alternately, a silicon photomultiplier (SiPM) can be employed to measure the charge via the light emitted from the phosphor screen. This decouples the signal from the microphonic noise and allows the temperature of colder and smaller plasmas to be measured than could be measured previously; this paper focuses on the advantages of a SiPM over a FC.