Bulletin of the American Physical Society
Joint Fall 2010 Meeting of the Texas Sections of the APS, AAPT, Zone 13 of SPS and the National Society of Hispanic Physicists
Volume 55, Number 11
Thursday–Saturday, October 21–23, 2010; San Antonio, Texas
Session FM4: High Energy/Nuclear |
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Chair: Carlos Bertulani, Texas A&M University-Commerce Room: University Center III Harris Room, 2nd floor |
Friday, October 22, 2010 10:00AM - 10:12AM |
FM4.00001: Construction and Testing of Scintillating Fiber Hodoscope readout with a Multianode Photomultiplier Kenneth Verlage, Nural Akchurin We constructed two scintillating fiber hodoscope arrays to measure horizontal and vertical position of high energy beam particles. We used 0.83mm diameter fibers arranged in a staggered configuration to allow for unique position determination with 96 pixel photomultipliers. The sensitive area consisted of 4 cm by 7cm. We present results on the crosstalk measurements using xp1724 photomultipliers. [Preview Abstract] |
Friday, October 22, 2010 10:12AM - 10:24AM |
FM4.00002: Construction of TAMU3: A 14 Tesla Nb$_{3}$Sn Model Dipole Eddie Holik, Raymond Blackburn, Nick Diaczenko, Tim Elliott, Andrew Jaisle, Alfred McInturff, Peter McIntyre, Dior Sattarov The third phase of the Texas A{\&}M University Accelerator Research Lab's ``Stress-Managed'' high field magnet campaign has coil modules for the assembly of TAMU3. The third phase is the high field, B$_{max}$ $\geq$ 12 -- 14 Tesla, proof of principle test of the ``Stress-Managed'' coil fabrication design philosophy. Earlier dipole phases operated in the 5 -- 8 Tesla range using NbTi and early bronze (ITER) Nb$_{3}$Sn based superconductor. These third phase dipole winding modules use the tin rich multi-filament Nb$_{3}$Sn/Cu composite strand with its enhanced engineering current density therefore have the possibility of producing magnetic fields $>$ 14 Tesla, when combined with the evolution of much higher efficiency insulation. There are five modules under construction altogether, which are at various stages. The best performing pair during testing of these modules will comprise the upper and lower modules of TAMU4, a 4x2 cm aperture accelerator prototype dipole. There has also been progress in the fabrication and measurement techniques necessary to validate more accurately the ``Stress-Management'' approach. [Preview Abstract] |
Friday, October 22, 2010 10:24AM - 10:36AM |
FM4.00003: Scientific analysis of materials and designs to increase reliability and performance of RF Superconductivity Cavities Nathaniel Pogue, Peter McIntyre, Akhdiyor Sattarov, Charles Reece Texas A{\&}M in collaboration with Jefferson Lab has put together an investigative plan for analyzing material performance and design of Niobium superconducting cavities. A sample test cavity is being designed to analyze the materials used during construction to identify the main inhibiting factors of performance, or accelerating gradient achievable. Once these phenomena are known, enhancements can be made to the surface to push to even higher limits thus reducing the cost and with higher gradients. These enhancements are new layered surface treatments that can be put down using a sophisticated cluster tool obtained by A{\&}M. Once these layers are tested and certified as being extremely useful, the only means of applying them is through an open assembly cavity design, or polyhedral cavity. This cavity has many advantages: ease of machining, visible analysis, open cleaning, iris size reduction, and elimination of instabilities caused by other fields. This plan could dramatically change the landscape of common practices in high performance niobium cavities. [Preview Abstract] |
Friday, October 22, 2010 10:36AM - 10:48AM |
FM4.00004: Pressure Dependence Studies on UTA GEM Based Digital Hadron Calorimeter Edwin Baldelomar The University of Texas at Arlington High Energy Physics group has been developing a Digital Hadron Calorimeter (DHCAL) for the future International Linear Collider (ILC) using the Gas Electron Multiplier (GEM) technology. The group has built several prototype chambers of dimension 30cmx30cm. The prototypes have been successful in measuring charges deposited from traversing incident particles from cosmic ray and radioactive sources. The data was taken using the KPIX ASIC chips. This presentation includes the pressure variance of the GEM chamber and thus correcting for gain using cosmic and Fe 55 data through KPiX. In addition, the significance of the results to the future development of actual GEM DHCAL for use in the ILC experiments. [Preview Abstract] |
Friday, October 22, 2010 10:48AM - 11:00AM |
FM4.00005: Capacitive Stress Transducers in High-Field Superconducting Magnets Christopher Benson, Peter McIntyre, Al McInturff, Andrew Jaisle, Trey Holik The dipoles needed for hadron colliders pose extreme challenges for the distribution of Lorentz stress within the coils. A strategy for stress management has been developed at Texas A{\&}M University. Part of that development utilizes capacitive stress transducers to monitor the Lorentz forces within the coil packages. Constructing repeatable and reliable stress transducers has required the development of new tooling and procedures to streamline fabrication and calibration processes. The design, tooling and fabrication techniques used for capacitive stress transducers will be described along with the effect of improvements on the repeatability and performance of the transducers. [Preview Abstract] |
Friday, October 22, 2010 11:00AM - 11:12AM |
FM4.00006: Simulations for the NIFFTE High Precision TPC Remington Thornton The Neutron Induced Fission Fragment Tracking Experiment has designed a Time Projection Chamber (TPC) to measure neutron induced fission cross-section measurements of the major actinides to sub-1\% precision over a wide incident neutron energy range. These measurements are necessary to design the next generation of nuclear power plants. In order to design a TPC capable of making these measurements, a precise simulation was required to ensure better track reconstruction. Using the Geometry And Tracking (Geant4) simulation platform along with standalone code, a complete simulation package has been written. Asynchronous trigger, 3-D charge diffusion, capacitive charge sharing, digitization, random trigger cells, and noise from the electronics have been modeled inside the detector response simulation, along with code that generates bi-products of fission events for Geant4. This talk will discuss the current status and future planned developments of this work including the efforts to make this code reusable for future TPC projects. [Preview Abstract] |
Friday, October 22, 2010 11:12AM - 11:24AM |
FM4.00007: Track Reconstruction in a Time Projection Chamber Designed to Make High Precision Fission Cross Section Measurements Sarvagya Sharma The TPC (Time Projection Chamber), being constructed by the NIFFTE (Neutron Induced Fission Fragment Tracking Experiment) collaboration will be used for high-precision fission cross-section measurements. These measurements will aid in the design of future generations of nuclear power plants. The NIFFTE track reconstruction effort has developed two approaches consisting of a variety of statistical estimators. The first, consists of traditional cluster and hit finding algorithms that are performed on 2D planes. A least squares is performed on the hits to produce a track in the TPC. The alternate approach uses the Hough Transform, a brute force attempt at finding tracks that isolates features in the TPC volume through data binning. To determine fit parameters, a Kalman Filter has been implemented that accounts for multiple scattering and kinks in the track. Comparing simulated and reconstructed tracks have shown the validity of these methods. The software uses open source packages to ensure re-usability for future TPC projects. In my talk, I will describe these methods in detail. [Preview Abstract] |
Friday, October 22, 2010 11:24AM - 11:36AM |
FM4.00008: Electron screening and its effects on Big-Bang nucleosynthesis Biao Wang, Carlos Bertulani, A. Baha Balantekin We study the effects of electron screening on nuclear reaction rates occurring during the Big Bang nucleosynthesis epoch. The sensitivity of the predicted elemental abundances on electron screening is studied in details. It is shown that electron screening does not produce noticeable results in the abundances unless the traditional Debye-H\"uckel model for the treatment of electron screening in stellar environments is enhanced by several orders of magnitude. The present work rules out electron screening as a relevant ingredient to Big Bang nucleosynthesis. [Preview Abstract] |
Friday, October 22, 2010 11:36AM - 11:48AM |
FM4.00009: SCALE 6.1 Validation Testing: Unit Cell Data and Material Input Paul Stauduhar, Brad Rearden, Douglas Peplow, Chris Perfetti, Oscar Lastres, Heather Connaway, David Hartmangruber SCALE (Standardized Computer Analysis for Licensing Evaluation) computer program code system is used by the Nuclear Regulatory Commission, other regulating agencies, and scientists to perform important calculations for nuclear facilities and the transportation and storage of nuclear material. The SCALE 6.1 update improved computational abilities over previous versions. SCALE 6.1 must accurately execute all of the functions from SCALE 6.0 and be backwards compatible. A test suite was developed that implements the various modules of SCALE 6.1 and tests them against certain benchmark problems known to execute correctly in SCALE 6.0. The research reported here, conducted at Oak Ridge National Laboratory, consisted of testing all parameters of the CENTRM/PMC and XSDRNPM functional modules, unit cell geometry data, and the material input processor of the SCALE code system. By creating a set of test problems based on certain benchmarks, specific indicating values are compared with known correct values to evaluate the accuracy between the software versions. My test suite and the test suites of four other testers will be part of a comprehensive tool sent with all new software packages of the SCALE 6.1 release. [Preview Abstract] |
Friday, October 22, 2010 11:48AM - 12:00PM |
FM4.00010: Nuclear high-K isomers viewed in extended deformation space Hongliang Liu, Furong Xu, Carlos Bertulani Multi-quasiparticle high-K isomers in heavy and superheavy nuclei are studied by configuration-constrained potential-energy-surface calculations extended to include reflection asymmetry or high order deformation. Actinide nuclei are found to be good candidates for the formation of high-K isomers in the second well of the potential-energy surface. The calculations with reflection asymmetry explain the inhibition of isomeric fission as being mainly attributed to the increased height of the fission barrier. Remarkable effects of high order deformation on $^{254}$No high-K isomers are found using calculations with $\beta_6$ deformation. The high order deformation leads to increased binding energies and enhanced deformed shell gaps at $N=152$ and $Z=100$. The inclusion of $\beta_6$ deformation significantly improves the description of the very heavy high-K isomers. [Preview Abstract] |
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