Fall 2008

News Briefs

The Deep Underground Science and Engineering Laboratory (DUSEL) is an initiative of the NSF to develop laboratory facilities on three levels in an abandoned gold mine at Homestake, SD. PSL has proposed a coordinated study of photomultiplier tubes (PMTs) which would operate reliably over long periods of time, in high purity water at pressures exceeding 6 atmospheres gauge pressure. This is the limiting factor in vertical size of a large water Cherenkov detector that would be used in DUSEL for detection of Long Baseline Neutrino Oscillations sent from FermiLab. PSL will build analytical, mechanical models of PMT structure and carry through Finite Element Analyses (FEA) to predict failure modes under pressure, iterating to improve the models. Rensselaer Polytechnic Institute will extend measurements of the effect of high purity water on PMT materials. Brookhaven National Laboratory will continue and extend PMT implosion testing to directly test manufacturer's PMTs and validate FEA calculations. Expertise has already been gained on previous experiments with similar constraints. In particular, PSL will benefit from testing the PMTs developed for IceCube as well as smaller PMTs intended for the Daya Bay Reactor neutrino oscillation experiment.

Dr. Fred Wightman of the University of Louisville has asked PSL to develop and build a speaker positioning system. The computer controlled assembly will move in a circular fashion in 1 degree segments. It must be able to move silently around a human test subject to study how he/she responds to directionality of sound.

The PSL website has a new look. The layout design was the cooperative effort of UW Communications Barry Carlsen and Jenny Klaila and PSL staff. It is a showcase of our expertise through pictures and project descriptions. Freelance Programmer Jeff Hamlett has been working with Jason Laffin, newly appointed PSL webmaster, updating programming and links to more efficiently move a visitor through the site. Categories of the project information have been changed to facilitate searches by keywords allowing a visitor to find similar projects, materials, machining or other capabilities or services they are interested in.


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