University of Iowa
During the summer two teachers and five students performed the following tasks:
Quartz Plate Preparation: The group prepared 20 quartz plates for test beam at CERN. The group polished the edge of the quartz plate and machined frames to fit the edge for close contact with a PMT. A "keeper" was formed to hold the plates in the frames. Plastic tubes were glued to the frames to safely mount the PMT's to the plates and insure the PMT's kept optical contact with the plates during the tests. After the plates were mounted in the frames, they were wrapped in Mylar and Tyvec and taped to be light-tight. They then went to CERN to be put in the test beam.
Prototype Light Guide: The barrel calorimeter of CMS at CERN needed to replace their photo-sensors because of a problem with the present ones in the high-magnetic fields in that detector. The new photosensors needed to connect with the optical fibers in the detector, so an interface was proposed and tested last year by our group. The group in charge of the calorimeter decided on a model and we were asked to build the prototype. The QuarkNet team machined and polished the "cookie"-like device and delivered it to the detector group for evaluation.
Cosmic Ray Muon Detectors (CRMD): Over the past years, our center had obtained and constructed three CMRDs for use in high-school labs. Bob Peterson visited us and showed us how to use the scopes with the e-Lab. We did some experiments in preparation for our teacher in-service and gained confidence in their use.
Teacher Institute: Eight teachers joined our two lead-teachers during an institute to share the work of the QuarkNet center at The University of Iowa. We began with background information on the Standard Model, accelerators and detectors. The teachers then broke into three groups and did experiments using the three CRMD's and e-Lab. The participants successfully posted data, wrote posters and completed an experiment using the equipment. The institute also featured a trip to Fermi lab for a day of tours and lectures.
Development of Directional Detector for LHC: Dr. Edwin Norbeck proposed a detector for use along the beam line at the Large Hadron Collider (LHC) at CERN. This "halo" detector would detect the presence of muons along the beam pipe that would measure background activity. This detector would discern the presence of muons and the direction they travel before the beams entered the collision point. The QuarkNet team assisted Dr. Norbeck in construction and testing of the detector using the counters of the CRMD as muon sensors. Our work with the CRMD enabled us to use cosmic muons as a source of signal for the detector and determine from them that the detector worked as designed and yielded the presence of the muons and their direction in the detector.
Our plans for the academic year are for deployment of our three muon telescopes with an initial schedule placing one at Bettendorf, one at The University of Iowa and the third circulating around central Iowa. We plan to do readings and post on the QuarkNet website.