M. Gebhard
Indiana University Bloomington
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Featured researches published by M. Gebhard.
Publications of the Astronomical Society of the Pacific | 2007
Charlie Baltay; D. Rabinowitz; Peter Andrews; A. Bauer; Nancy E. Ellman; W. Emmet; Rebecca Hudson; Thomas Hurteau; Jonathan Lee Jerke; Rochelle Lauer; Julia Silge; Andrew E. Szymkowiak; B. Adams; M. Gebhard; J. Musser; Michael W. Doyle; Harold L. Petrie; Roger Smith; Robert P. Thicksten; John C. Geary
We have designed, constructed, and put into operation a very large area CCD camera that covers the field of view of the 1.2 m Samuel Oschin Schmidt Telescope at the Palomar Observatory. The camera consists of 112 CCDs arranged in a mosaic of four rows with 28 CCDs each. The CCDs are pixel Sarnoff 600 # 2400 thinned, back-illuminated devices with pixels. The camera covers an area of on the
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1991
S. Nutter; C. Bower; M. Gebhard; R. Heinz; G.M. Spiczak
Abstract Sintered Halon G-80, a polytetrafluoroethylene (PTFE) resin available commercially in powdered form, is a superb diffuse reflector. Sintered Halon has 96% absolute reflectance at wavelengths between 300 nm and 380 nm, and about 98% absolute reflectance above 380 nm. It is chemically inert, is mechanically strong, does not fluoresce, and the high reflectance is easy to maintain over time. We have used sintered Halon as a lining in light integration boxes of water Cherenkov detectors. Preparation involves packing Halon powder into a mold to a specific density, then heating the material almost to the melting point (sintering). A method of preparing sintered Halon is presented. Physical properties of sintered Halon have been measured and we present those results here as well.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1988
J. Petrakis; C. Bower; M. Gebhard; R. Heinz; S. Mufson; J.M. Reynoldson; G.W. Turner
Abstract We describe the design and operation of a 1 m long spectrophotometer for measuring liquid attenuation lengths using light having wavelengths between 400 and 600 nm. By utilizing a blue light emitting diode and a lens focusing system, we are able to measure attenuation lengths from less than 1 m to above 30 m.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1988
S. Nutter; C. Bower; M. Gebhard; R. Heinz
Abstract A simple expression for the transmittance of a hollow cylindrical light pipe irradiated by isotropic incident radiation as a function of pipe size and inner wall reflectance is derived using a method based on the geometrical factor of particle telescopes. The predictions are confirmed by both a Monte Carlo calculation and experimental measurements.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1994
C. Bower; M. Gebhard; R. Heinz; J. Musser; J.J. Pitts; J.L. Miller; S. Mufson
We have built a position sensitive wire chamber and tested it with X-rays and cosmic ray muons. Using a fill gas of 62% CF4 and 38% CO2, we have achieved resolutions of 38 μm for 1 keV X-rays, 42 μm for normally incident cosmic ray muons in the absence of a magnetic field, and 46 μm for cosmic rays incident at the gass Lorentz angle for a 0.8 T magnetic field. For throughgoing charged particles, the degradation in position resolution with angle away from the optimum incident angle has been found to be 11 μm/° (added in quadrature).
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1992
A.K. Komives; C. Bower; M. Gebhard; R. Heinz; S. Nutter; J.J. Pitts; G.M. Spiczak; S. Ahlen
Abstract A spectrophotometer that measures the long attenuation length of mineral oil, typically 20 to 30 m, is described.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1989
R. Heinz; M. Gebhard; C. Bower
Abstract The experiment MACRO (Monopole, Astrophysics, and Cosmic Ray Observatory), located in the Gran Sasso Laboratory in Italy, will use approximately one million liters of liquid scintillator and will last for five to ten years. We have developed a simple test for the MACRO experiment that determines the concentration of pseudocumene in its scintillator. This test has general applicability for a content analysis of volatile components in any liquid scintillator.
Bulletin of the American Physical Society | 2015
Bruce Howard; B. Adams; Brian Baugh; Norm Buchanan; Len Bugel; J. M. Conrad; Ronald W. Davis; M. Gebhard; Michael Lang; Bill Miner; S. Mufson; J. Musser; Stephen Pordes; Brian J. Rebel; Paul Smith; Matt Toups; Jon Urheim; David Warner; Taritree Wongjirad; D. Whittington
Bulletin of the American Physical Society | 2014
D. Whittington; B. Adams; Brian J. Baptista; Brian Baugh; M. Gebhard; Michael Lang; S. Mufson; J. Musser; Paul Smith; Jon Urheim