6 research outputs found
Phototube tests in the MiniBooNE experiment
The MiniBooNE neutrino oscillation experiment at Fermilab uses 1520 8-inch
PMTs: 1197 PMTs are Hamamatsu model R1408 and the rest are model R5912. All of
the PMTs were tested to qualify for inclusion in the detector, sorted according
to their charge and time resolutions and dark rates. Seven PMTs underwent
additional low light level tests. The relative detection efficiency as a
function of incident angle for seven additional PMTs was measured. Procedures
and results are presented.Comment: 4 pages, 7 figures. Presented at Beaune 2005: 4th International
Conference on New Developments in Photodetection, Beaune, France, 19-24 June
200
MiniBooNE: Status of the Booster Neutrino Experiment
MiniBooNE is preparing to search for nu_mu to nu_e oscillations at Fermilab.
The experiment is designed to make a conclusive statement about LSND's neutrino
oscillation evidence. We give a status report on the preparation of the
experiment and outline the experimental prospects.Comment: 6 pages, To appear in Proceedings of the XIX International Conference
on Neutrino Physics and Astrophysics (Neutrino 2000), Sudbury. Canada, 16-21
June 200
A high purity measurement of at SLD
Precision measurement of Rb can provide important information about the Standard Model and beyond. SLD has developed a new method for measuring Rb with very high purity. This measurement has the lowest systematic error reported to date and future measurements using this method will likely have the lowest total uncertainty. This paper will be divided into the five sections: introduction, hardware, topological vertexing tag method, results and conclusions. The introduction will discuss the importance of Rb and the problems with other measurement techniques. The hardware section will give a brief description of the SLC/SLD system concentrating on its advantages over LEP. An outlook towards the future of SLD Rb measurements will be included in the conclusions
The Simons Observatory Large Aperture Telescope Receiver
The Simons Observatory (SO) Large Aperture Telescope Receiver (LATR) will be
coupled to the Large Aperture Telescope located at an elevation of 5,200 m on
Cerro Toco in Chile. The resulting instrument will produce arcminute-resolution
millimeter-wave maps of half the sky with unprecedented precision. The LATR is
the largest cryogenic millimeter-wave camera built to date with a diameter of
2.4 m and a length of 2.6 m. It cools 1200 kg of material to 4 K and 200 kg to
100 mk, the operating temperature of the bolometric detectors with bands
centered around 27, 39, 93, 145, 225, and 280 GHz. Ultimately, the LATR will
accommodate 13 40 cm diameter optics tubes, each with three detector wafers and
a total of 62,000 detectors. The LATR design must simultaneously maintain the
optical alignment of the system, control stray light, provide cryogenic
isolation, limit thermal gradients, and minimize the time to cool the system
from room temperature to 100 mK. The interplay between these competing factors
poses unique challenges. We discuss the trade studies involved with the design,
the final optimization, the construction, and ultimate performance of the
system