Bulletin of the American Physical Society
2018 Joint Fall Meeting of the Texas Sections of APS, AAPT and Zone 13 of the SPS
Volume 63, Number 18
Friday–Saturday, October 19–20, 2018; University of Houston, Houston, Texas
Session P02: High Energy and Particle Physics IV |
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Chair: Claudia Ratti, University of Houston Room: Science and Engineering Classroom (SEC) 101 |
Saturday, October 20, 2018 2:10PM - 2:22PM |
P02.00001: Lattice Subtraction Methods at Low Quark Mass Travis H Whyte, Suman Baral, Walter Mark Wilcox, Ron Morgan In Lattice QCD, the evaluation of quark loop effects is an essential, but computationally expensive, part of the evaluation of quark operators. Because of this, approximation techniques must be employed, which introduce statistical uncertainty in the extraction of signals. In this study, we present new noise subtraction techniques for the evaluation of disconnected quark loop diagrams using a finite number of noises to help reduce the error in the calculation of quark operators. This study uses a 243 x 32 Wilson lattice in the quenched approximation for testing. Results for deflation, polynomial subtraction, and combination methods are presented, along with a new method termed “Hermitian Forced Eigenvalue and Polynomial Subtraction (HFPOLY)”. We are able to improve signals down to zero quark mass using a combination of linear solvers called GMRES-DR and MINRES-DR, for the nonHermitian and Hermitian Wilson matrices, respectively. |
Saturday, October 20, 2018 2:22PM - 2:34PM |
P02.00002: Testing the New Readout Hardware for the ITS Detector at ALICE Ryan P Hannigan The ALICE detector at CERN will be undergoing major upgrades to handle the increased collision rate of the LHC during Run 3, as well as to achieve higher precision particle tracking. The Inner Tracking System (ITS), a detector component which plays a pivotal role in the reconstruction of secondary vertices from heavy flavor particle decays, will be completely replaced by a seven layer silicon pixel detector. In order to handle the higher data throughput from the increased collision rate, the production of new readout hardware for the ITS is a necessity. In this talk we will give an overview of the ALICE ITS upgrade, and detail the testing procedures using the new Readout Hardware on the software level. |
Saturday, October 20, 2018 2:34PM - 2:46PM |
P02.00003: A new design for a 16 tesla cos(ϑ) accelerator magnet Trey Holik The Future Circular Collider or FCC is a study aimed at exploring the possibility to reach 100 TeV total collision energy which would require 16 tesla dipoles. Upon the conclusion of the High Luminosity Upgrade, the US LHC Accelerator Upgrade Project in collaboration with CERN will have extensive Nb3Sn magnet fabrication experience. This experience includes robust Nb3Sn conductor and insulation scheming, 2-layer cos2θ coil fabrication, and bladder-and-key structure and assembly. By making improvements and modification to existing technology the feasibility of a two-layer 16 tesla dipole is investigated. Preliminary designs indicate that fields up to 16.6 tesla are feasible with |
Saturday, October 20, 2018 2:46PM - 2:58PM |
P02.00004: Nuclear Structure in the LHC Run II Era Jesse Kent, Eric Godat, Fredrick Olness We present the status of a new nCTEQ global analysis of nuclear Parton Distribution Functions (nPDFs) in the LHC era. This presentation will briefly discuss what parton distribution functions are, how they can be extended from protons to larger nuclei, the structure of a nCTEQ global fit analysis, and the process by which we include new data into the analysis. We will also introduce nCTEQ++, an updated modular C++ coding framework that allows us to combine NLO theoretical predictions and fit them to the latest experimental data from Run II at the Large Hadron Collider. Finally, we show preliminary results of how these new data impact our global analysis. |
Saturday, October 20, 2018 2:58PM - 3:10PM |
P02.00005: Purification Complexity of Gaussian States Elena Caceres, Shira Chapman, Josiah D Couch, Juan Pablo Hernandez, Rob Myers, Shan-Ming Ruan We seek to test the recent conjecture of Agón, Headrick, and Swingle that holographic subregion complexity according to 'complexity = action' is dual to the purification complexity of the dual mixed state. We test this indirectly by considering the ground state of a free scalar field theory regularized to a lattice and computing the purification complexity of the reduced state on a subset of the lattice sites. Even though this system is not holographic, the hope is that the divergence structure will be universal enough that we may meaningfully compare to the holographic results. |
Saturday, October 20, 2018 3:10PM - 3:22PM |
P02.00006: R&D of Electroluminescense Techniques for Neutrinoless Double Beta Decay Experiments Grant Kendrick Parker The NEXT collaboration is developing a sequence of high-pressure xenon gas time projection chambers with the aim of creating a ton-scale, minimal-background neutrinoless double beta decay search. While many aspects of this experiment scale easily, some detector elements require more consideration and research to build the full-scale setup, such as the electroluminescent tracking scheme. This talk will describe UTA research on electroluminescent gain regions, high voltage feed-through's and field cage elements for 100kg- and ton-scale xenon gas experiments. |
Saturday, October 20, 2018 3:22PM - 3:34PM |
P02.00007: R&D Toward Ton-Scale HPGXe Neutrinoless Double Beta Decay Experiments Sanmitra Pingulkar The NEXT collaboration is developing a sequence of high pressure xenon gas time projection chambers with the aim of creating a ton-scale, very low background neutrinoless double beta decay search. While most aspects of this technology are easily scalable, some detector elements require R&D in order to be realized on a large scale. This poster will describe a new, large-scale test facility under development at the University of Texas at Arlington, which will be used to test electroluminescent gain regions, high voltage feed-throughs and field cage elements for 100kg- and ton-scale xenon gas experiments. |
Saturday, October 20, 2018 3:34PM - 3:46PM |
P02.00008: Electric Field Simulations for Proto-DUNE Far-Side Detector Mathew A Rapp The Deep Underground Neutrino Experiment (DUNE is an international project to study neutrino interaction. The purpose of studying these interactions is to understand the properties and behavior of the neutrino. the Is now preparing to construct a 15x15x66 meter detector. The detectors largest feature is a series of aluminum rings equally spaced 3cm apart that form a cubic structure. A potential difference of 600 kV between the upper most ring and the cathode at the bottom of the detector is utilized to create a uniform electric field of 500 v/cm within the detector. The cathode is divided into a grid of mechanically connected individual square components. Simulations of the detector gives insight to how the electric field will behave. Using COMSOL Multiphysics, a detailed electric field distribution is produced to study. These simulations are used to ensure the current geometry of components does not interact negatively with the intended field. Any imperfections in the design or production of the detector’s components are then identified. Information produced using COMSOL is used to determine the details in the detectors final structure. |
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