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 RbR_b 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