Bulletin of the American Physical Society
Inaugural Fall 2009 Meeting of the Prairie Section of the APS
Volume 54, Number 17
Thursday–Saturday, November 12–14, 2009; Iowa City, Iowa
Session N1: Particle Physics III |
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Chair: Robert Zwaska, Fermi National Accelerator Laboratory Room: IMU 348 (Illinois Room) |
Saturday, November 14, 2009 8:30AM - 9:06AM |
N1.00001: Much Ado About (Almost!) Nothing: The Experimental Study of Neutrino Masses and Mixing Invited Speaker: Neutrinos have been described by their discoverer Frederick Reines as ``the most tiny quantity of reality ever imagined by a human being.'' Yet these particles which verge on nothingness have had an enormous influence on the past and future evolution of the universe and are the subject of an increasingly active program of experimental physics. In this talk I will review some of the basic properties of neutrinos and summarize the recent results on neutrino masses and mixing from studies of neutrinos produced in the Sun, cosmic rays, reactors, and accelerators including searches for zero neutrino double beta decay. Looking ahead, I will outline the future course of experiments in the U.S., Asia, and Europe which will address the questions of the fundamental character of the neutrino, the hierarchy of their masses, and their matter anti-matter symmetries. [Preview Abstract] |
Saturday, November 14, 2009 9:06AM - 9:18AM |
N1.00002: R\&D Studies on Radiation Hard Wavelength Shifting Fiber for CMS Hadronic Endcap Calorimeter Upgrade John Neuhaus The Hadronic Endcap (HE) calorimeters of the CMS experiment cover the pseudorapidity range of 1.4 to 3 on both sides of the CMS detector, contributing to superior jet and missing transverse energy resolutions. As the integrated luminosity of the LHC increases, the scintillator tiles used in the CMS Hadronic Endcap calorimeter will lose their efficiency. Here, we propose to replace the scintillator tiles in high radiation area with ``radiation hard'' quartz plates. To increase the light collection efficiency, the generated Cerenkov photons are collected by UV absorbing wavelength shifting (WLS) fibers. Our previous study has shown that quartz plates and plastic wavelength shifting fibers can be used as an effective calorimeter. However there is no radiation hard WLS fiber commercially available. Here we summarize the R\&D studies on constructing a radiation hard WLS fiber prototype in University of Iowa CMS Laboratories. The results from the tests performed on quartz fibers treated with p-Terphenyl, as well as the Geant4 simulations of this prototype are presented. [Preview Abstract] |
Saturday, November 14, 2009 9:18AM - 9:30AM |
N1.00003: An Investigation of Cosmic Muon Interactions with HF PMTs and Upgrade Candidates John Neuhaus The Compact Muon Solenoid (CMS) is one of the multi purpose experiments of the ``soon to begin'' Large Hadron Collider project. The Hadronic Forward calorimeters of CMS use Hamamatsu R7525-HA Photomultiplier tubes (PMT) for signal readout. Our previous studies revealed abnormally high amplitude signals due to punch through charged particles, mostly muons, producing Cerenkov photons at the PMT window. It is proposed to replace the HF PMTs with new generation PMTs with higher quantum efficiency. Here we report from the tests performed at the University of Iowa CMS laboratories with cosmic muons. The magnitude of the signal generated by the muons traversing the windows of the HF PMTs and the candidate PMTs were compared. We also present our Geant4 simulations efforts confirming these measurements. [Preview Abstract] |
Saturday, November 14, 2009 9:30AM - 9:42AM |
N1.00004: P-Terphenyl Deposited Quartz Plate Calorimeter Prototype James Wetzel Due to an expected increase in radiation damage under super-LHC conditions, we propose to substitute the scintillator tiles in the original design of the CMS hadronic endcap (HE) calorimeter with quartz plates. Quartz is proved to be radiation hard by various tests, but the Iight produced by quartz comes from Cerenkov process, and it is 100 times less than scintillation photons. To enhance the light production we treated the quartz plates with p-Terphenyl, and constructed a 20 layers calorimeter prototype. Here, we report the test beam results for hadronic and electromagnetic capabilities of the calorimeter prototype as well as radiation damage results for pTerphenyl. [Preview Abstract] |
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