Bulletin of the American Physical Society
2010 Fall Meeting of the APS Division of Nuclear Physics
Volume 55, Number 14
Tuesday–Saturday, November 2–6, 2010; Santa Fe, New Mexico
Session CF: Detector Electronics and Readout |
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Chair: Robert Grzywacz, University of Tennessee Room: Kearney |
Thursday, November 4, 2010 8:30AM - 8:42AM |
CF.00001: Level-1 Trigger of the GlueX experiment at Jefferson Lab Alexander Somov The GlueX is a new experiment at Jefferson Lab designed to search for mesons with exotic-quantum-numbers using high-intensity beam of polarized photons incident on a liquid hydrogen target. The goal of the Level-1 trigger of the GlueX experiment is to reduce the background rate induced by electromagnetic and hadronic interactions (to 200 kHz total rate) while keeping efficiency for accepting exotic mesons of interest close to unity. The trigger algorithm is based on measurement of the energy depositions in two electromagnetic calorimeters and hit counts in the tagger hodoscopes, the time-of-flight detector, and the Start Counter. The algorithm will be implemented on electronics boards developed at Jefferson Lab, which will perform online data processing at a 250 MHz clock. We will describe the Level-1 trigger algorithm and overview the trigger electronics. [Preview Abstract] |
Thursday, November 4, 2010 8:42AM - 8:54AM |
CF.00002: Implementation of multi-channel electronics system for astrophysical reaction studies at ORNL S.H. Ahn, K.L. Jones, M. Matos, D.W. Bardayan, K.Y. Chae, M.S. Smith, R.J. Varner, J.M. Elson, M.A. Famiano The development of large area, high-granularity silicon detector arrays has created opportunities to study transfer reactions in inverse kinematics with low-intensity radioactive beams. We are developing a new detector array comprised of 24 double-sided silicon strip detectors that will allow measurements with lower thresholds and better resolution than current detectors at ORNL. To instrument this new array, we are implementing $\sim$2000 channels of signal processing electronics based on application-specific integrated circuits (ASICs) designed at Washington University. The ASICs handle pulse shaping, timing, triggering, and digitization of 32 channels all on a single chip. In addition, a Real-Time Executive for Multiprocessor Systems (RTEMS) is used for a network communication between the electronics and data acquisition server. Details of the electronics setup and a status report on the devices will be presented. We will also discuss plans to utilize this system for experiments of transfer reactions using radioactive ion beams. [Preview Abstract] |
Thursday, November 4, 2010 8:54AM - 9:06AM |
CF.00003: Readout Electronics for the Forward Vertex Detector at PHENIX Michael Phillips The PHENIX experiment at RHIC at Brookhaven National Laboratory has been providing high quality physics data for over 10 years. The current PHENIX physics program will be significantly enhanced by addition of the Forward Silicon Vertex upgrade detector (FVTX) in the acceptance of existing muon arm detectors. The proposed tracker is planned to be put into operation in 2012. Each arm of the FVTX detector consist of 4 discs of silicon strip sensors combined with FPHX readout chips, designed at FNAL. The full detector consists of over 1 million active mini-strip channels with instantaneous bandwidth topping 3.4 Tb/s. The FPHX chip utilizes data push architecture with 2 serial output streams at 200 MHz. The readout electronics design consists of Read-Out Cards (ROC) located in the vicinity of the detector and Front End Modules (FEM) located in the Counting House. ROC boards combine the data from several chips, synchronizes data streams and send them to FEM over a Fiber Optics Link. The data are buffered in the FEM and then sent to a standard PHENIX DAQ interface upon Level-1 trigger request. We will present the current status of the readout electronics development and testing, including tests with data from production wedges. [Preview Abstract] |
Thursday, November 4, 2010 9:06AM - 9:18AM |
CF.00004: Sensors, High Density Interconnect and Readout Chips for the Forward Vertex Detector at PHENIX Alexander Barron The PHENIX experiment at RHIC at Brookhaven National Laboratory has been providing high quality physics data for over 10 years. The current PHENIX physics program will be significantly enhanced by addition of the Forward Silicon Vertex upgrade detector (FVTX) in the acceptance of existing muon arm detectors. The proposed tracker is planned to be put into operation in 2012. Each arm of the FVTX detector consist of 4 discs of silicon strip sensors combined with FPHX readout chips, designed at FNAL. The full detector consists of over 1 million active mini-strip channels on sensors based on a custom design by the FVTX Collaboration and built by Hamamatsu. The sensors are bonded to a High-Density-Interconnect (HDI) card which provides the platform for the sensors, readout chips, and connection to the rest of the readout electronics. We describe in detail the geometry and performance metrics of the sensors, HDI and FPHX chips, including tests performed on each to verify production quality. [Preview Abstract] |
Thursday, November 4, 2010 9:18AM - 9:30AM |
CF.00005: Digital Data Acquisition System for Gammasphere C.R. Hoffman, J.T. Anderson, M.P. Carpenter, T.A. Hayden, R.V.F. Janssens, A. Kreps, T. Lauritsen, C.J. Lister, D. Seweryniak, P. Wilt, S. Zhu, M. Cromaz, C. Lionberger, I.Y. Lee A new digital-based data acquisition system for Gammasphere is under development. This system leverages the electronics designed for the GRETINA collaboration. At the center of this development are the GRETINA 10-channel digitizer modules which digitize the Ge preamp signals at a 100MHz rate [1]. The new DAQ will increase event throughput significantly over the existing system while addressing multiple repair and maintenance issues. New hardware and firmware to integrate the GRETINA electronics with Gammasphere has been developed allowing for a staged changeover so that the experimental program will not be adversely affected. A successful field test of a small number of channels running parasitically to the analog system has demonstrated the anticipated increase in event rate and shown that the energy resolution will still remain satisfactory at these higher rates. The current status of project will be presented. This research is supported by the DOE Office of Nuclear Physics under Contract No. DE-AC02-06CH11357. [1] J.T. Anderson \textit{et al., }IEEE Transactions on Nuclear Science, vol. 56, issue 1, pp. 258-265. [Preview Abstract] |
Thursday, November 4, 2010 9:30AM - 9:42AM |
CF.00006: High Voltage Distribution Edwin Norbeck, Michael Miller, Yasar Onel For detector arrays that require 5 to 10 kV at a few microamps each for hundreds of detectors, using hundreds of HV power supplies is unreasonable. Bundles of hundreds of HV cables take up space that should be filled with detectors. A typical HV module can supply 1 ma, enough current for hundreds of detectors. It is better to use a single HV module and distribute the current as needed. We show a circuit that, for each detector, measures the current, cuts off the voltage if the current exceeds a set maximum, and allows the HV to be turned on or off from a control computer. The entire array requires a single HV cable and 2 or 3 control lines. This design provides the same voltage to all of the detectors, the voltage set by the single HV module. Some additional circuitry would allow a computer controlled voltage drop between the HV and each individual detector. [Preview Abstract] |
Thursday, November 4, 2010 9:42AM - 9:54AM |
CF.00007: Neutron Detector Waveform Digitization Jonathan Toebbe, Fred Gray, Elliot Grafil, Uwe Greife In the frame of a DoE Office of Nuclear Energy funded collaboration to design a next generation neutron elastic and inelastic scattering experiment, the Colorado School of Mines/Regis University group is responsible for developing and testing neutron detectors, pulse shape discrimination and read-out methods. This contribution will describe the test setup based on an n-ToF neutron selection using a $^{244}$Cm-$^{13}$C source and the Regis Digitizer. Results on pulse shape discrimination from waveform digitization will be compared to other commercially available discrimination methods. We will also present our efforts to explore different types of algorithm for extraction of neutron assignment probabilities from the collected waveforms. [Preview Abstract] |
Thursday, November 4, 2010 9:54AM - 10:06AM |
CF.00008: Sub-nanosecond Timing Using 100Mhz Digital Electronics Stanley Paulauskas, Robert Grzywacz, Miguel Madurga, Stephen Padgett The use of 100Mhz digital electronics to measure time differences of less than one nanosecond are investigated. Numerical algorithms are used to extract time information from the signal. Two different algorithms have been developed to achieve this time resolution. The first algorithm fits a function to the pulse shape. This shape is a folding of the input signal and the response of the electronics. In the second method, an analytical function of the waveform has been extracted. This allows one to use a single point along the leading edge of the waveform to determine the time. Tests have been carried out using a pulser. Results of these tests and applications to scintillator detectors will be presented. [Preview Abstract] |
Thursday, November 4, 2010 10:06AM - 10:18AM |
CF.00009: A high-efficiency Si-detector array for HELIOS B.B. Back, B. DiGiovine, S. Heimsath, A.M. James, C.R. Hoffman, B.P. Kay, A.M. Rogers, J.P. Schiffer, A.H. Wuosmaa, J.C. Lighthall, S.T. Marley HELIOS at ATLAS consists of a large superconducting solenoid with its magnetic axis aligned with the beam. Light charged particles emitted from the target are bent in helical orbits back to the axis where their energy and point of impact are measured by a position-sensitive Si-detector array to fully characterize two-body reactions [1]. Using an array assembled from a set of 24 Si wafers from an earlier project, this spectrometer has been in operation since August 2008 [2,3]. We will discuss the challenges in designing a new, optimized Si detector configuration that simultaneously allows for the beam to enter the spectrometer through a large bore in the upstream array, kinematic recoil detection through the bore of the downstream array, liquid cooling of the Si wafers, optimal efficiency, and the possibility of replacing individual Si wafers in the case of failure. [1] A.H. Wuosmaa {\it et al.}, Nucl. Inst. Meth. A 580, 1290 (2007) [2] B.B. Back {\it et al.}, Phys. Rev. Lett. 104, 132501 (2010) [3] J.C. Lighthall {\it et al.}, Submitted to Nucl. Instr. Meth. (May 2010) [Preview Abstract] |
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