Bulletin of the American Physical Society
2011 Fall Meeting of the APS Division of Nuclear Physics
Volume 56, Number 12
Wednesday–Saturday, October 26–29, 2011; East Lansing, Michigan
Session DD: Instrumentation II |
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Chair: Luke Myers, Duke University Room: Heritage |
Thursday, October 27, 2011 10:30AM - 10:42AM |
DD.00001: Performance Characteristics of the Next Generation Solid-State Photomultipliers Erik Bjorn Johnson, Christopher Stapels, Xiao Jie Chen, Chad Whitney, Mark Hammig, Joe Campbell, James Christian A typical method for detection of radiation consists of using a scintillation material with a photomultiplier tube (PMT), which continues to provide excellent performance in comparison to the solid-state photomultiplier (SSPM). The SSPM has a number of features that makes it a viable alternative, as in being insensitive to magnetic fields, robust, compact, and requiring low voltages for operation, but the major limiting factor associated with a direct replacement for the PMT with SSPMs is the dark current. We will demonstrate a potential, low-cost solution for an upgrade to the PRIMEX experiment at Jefferson Laboratories. We will discuss the characteristics of SSPMs fabricated with commercial and non-commercial CMOS processes. Where the commercial process is reliable but limited in design features, the non-commercial process, which allows for greater control of the design, may have challenges with process control without a dedicated foundry. Fabricated designs show an increase in the ratio of detected photons to dark counts by a factor of 10, and the work will discuss the performance characteristics of the next-generation of solid-state photomultiplier in the context of nuclear and high-energy physics experiments. [Preview Abstract] |
Thursday, October 27, 2011 10:42AM - 10:54AM |
DD.00002: Timing Resolution tests of Silicon Photomultipliers for use at the Jefferson Lab Alexander Reustle, Vitaly Baturin Silicon Photomultipliers are currently under much scrutiny at the Jefferson Lab. Their small size, and ability to operate unshielded in strong magnetic fields make them ideal for use in particle accelerators. At the Jefferson Lab these SiPMs are slated for possible use in several detector systems in the new 12GeV upgrade. One such project is the Central Time of Flight (CTOF) detector in CLAS Hall B, whose goal is to identify and distinguish between particle species using Timing and Momentum calculations. The Photomultipliers in this detector will experience magnetic fields of up to 5 T and require timing resolutions of 50ps, the smallest of any detector in the lab. Currently this role is filled by Hammamatsu R2083 PMTs, which require robust magnetic shielding. Resolution tests were performed with directed LED light at various frequencies and intensities. The SiPMs were found to have a resolution of 76ps at usable surface areas, 50{\%} greater than the required maximum of 50ps for CTOF, but well below that necessary for other detector systems, such as the Central Neutron Detector and Photon Tagger arrays. [Preview Abstract] |
Thursday, October 27, 2011 10:54AM - 11:06AM |
DD.00003: The NIFFTE Data Acquisition System Hai Qu The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) will employ a novel, high granularity, pressurized Time Projection Chamber to measure fission cross-sections of the major actinides to high precision over a wide incident neutron energy range. These results will improve nuclear data accuracy and benefit the fuel cycle in the future. The NIFFTE data acquisition system (DAQ) has been designed and implemented on the prototype TPC. Lessons learned from engineering runs have been incorporated into some design changes that are being implemented before the next run cycle. A fully instrumented sextant of EtherDAQ cards (16 sectors, 496 channels) will be used for the next run cycle. The Maximum Integrated Data Acquisition System (MIDAS) has been chosen and customized to configure and run the experiment. It also meets the requirement for remote control and monitoring of the system. The integration of the MIDAS online database with the persistent PostgreSQL database has been implemented for experiment usage. The detailed design and current status of the DAQ system will be presented. [Preview Abstract] |
Thursday, October 27, 2011 11:06AM - 11:18AM |
DD.00004: Implementation of Environmental Monitors for NIFFTE and SeaQuest Experiments Donald Isenhower The implementation of environmental monitors for the LANSCE NIFFTE and Fermilab SeaQuest experiments will be discussed. The emphasis will be on the use of a single, low cost, general purpose instrument, as opposed to a system of specialized, multiple subsystems. The implementation uses a Keithley{\texttrademark} 2701 Multimeter/Data Acquisition System with a Keithley{\texttrademark} 7710 solid state multiplexer. The system will be set up to work with MIDAS or CODA as the DAQ interface. It can have multiple types of sensors hooked up, as each channel is independent and can measure any parameter ordinarily associated with a DMM. The inputs can be a mixed composition of thermocouples, thermistors, LVDTs, pressure, humidity, and other sensors. The Keithley{\texttrademark} 2701 is easily controlled via the ``Standard Commands for Programmable Instrumentation'' (SCPI) Ethernet interface in a Linux environment. The different ways in which such a system can be configured as part of the LANSCE NIFFTE and Fermilab SeaQuest slow control systems will be demonstrated. [Preview Abstract] |
Thursday, October 27, 2011 11:18AM - 11:30AM |
DD.00005: Analysis Techniques for the Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) Richard Baker The NIFFTE experiment has developed and tested a Time Projection Chamber (TPC) for the study of neutron induced fission events. The TPC is designed to measure fission cross sections with better than 1\% precision. The TPC creates a three dimensional pixelated image of the charge deposited as the fission fragments pass through the gas volume. The analysis of this data requires robust algorithms for reconstructing the tracks of the charged particles and identifying each particle track as either a proton (from n-p scatter), alpha (decays in target) or a fission fragment. This talk will provide a comprehensive overview of the reconstruction and analysis techniques that have been developed for NIFFTE with a discussion of preliminary results from engineering studies. [Preview Abstract] |
Thursday, October 27, 2011 11:30AM - 11:42AM |
DD.00006: Progress on Data Collection and Analysis with the NIFFTE TPC Lucas Snyder The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has constructed and tested a Time Projection Chamber (TPC) designed to measure fission cross sections to a higher accuracy than has been achieved previously. In this talk I will describe the status of the fission TPC and progress on measuring the alpha decay to spontaneous fission branching ratio of Cf-252. [Preview Abstract] |
Thursday, October 27, 2011 11:42AM - 11:54AM |
DD.00007: SAMURAI-TPC: A Time Projection Chamber for Constraining the Asymmetry Energy at High Density A.B. McIntosh, N. Maass, S.J. Yennello, J. Barney, Z. Chajecki, C.F. Chan, J.W. Dunn, J. Estee, J. Gilbert, F. Lu, W.G. Lynch, R. Shane, M.B. Tsang, M. Famiano, T. Isobe, H. Sakurai, A. Taketani, T. Murakami The SAMURAI-TPC is a time projection chamber designed to measure pions and light charged particles. By measuring pion yield ratios and particle flow in heavy ion collisions around E=200A MeV, we expect to constrain the behavior of the nuclear asymmetry energy around twice saturation density. In this talk, the design and construction of the TPC components will be discussed. Upon completion, the SAMURAI-TPC will be installed in the SAMURAI spectrometer at the Radioactive Isotope Beam Facility at RIKEN, Japan. This work is supported by the Department of Energy (DE-SC0004835). [Preview Abstract] |
Thursday, October 27, 2011 11:54AM - 12:06PM |
DD.00008: SAMURAI-TPC: Field Cage Design and Prototyping F. Lu, J. Barney, Z. Chajecki, C.F. Chan, J.W. Dunn, J. Estee, J. Gilbert, W.G. Lynch, R. Shane, M.B. Tsang, A.B. McIntosh, S.J. Yenello, M. Famiano, T. Isobe, H. Sakurai, A. Taketani, T. Murakami The SAMURAI-TPC is a time-projection chamber to be used in conjunction with the SAMURAI spectrometer being built at the Radioactive Isotope Beam Facility at RIKEN, Japan. It will be used to measure charged pions, protons and light ions. The pi+/pi- ratios from heavy-ion collisions should provide constraints on the asymmetry term in the nuclear equation of state at densities about twice saturation density. In this talk, the design and operation of the field cage, an essential part of the detector, will be discussed, along with the results of prototype testing. [Preview Abstract] |
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