Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session E02: 35 Years of Jlab |
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Chair: Jian-ping Chen, Jefferson Laboratory Room: Holiday Inn Resort Airlie/Tidewater |
Friday, November 8, 2019 8:00AM - 8:30AM |
E02.00001: 35 years of CEBAF - Historic Review Invited Speaker: Andrew Hutton Jefferson Lab, the youngest of the DOE Science laboratories, is now more than thirty years old, time to look back and understand how the lab has become a pillar of nuclear physics research in the world. Initially, a 2GeV conventional linac and stretcher ring was foreseen, but as soon as Hermann Grunder was nominated as Lab Director, he changed the design to a superconducting, recirculating linac. It is this accelerator, CEBAF, which has become the workhorse at Jefferson Lab, first at 4 GeV, then 6 GeV, and then an upgrade to 12GeV. The talk will follow this evolution of the accelerator complex. [Preview Abstract] |
Friday, November 8, 2019 8:30AM - 9:00AM |
E02.00002: Highlights of the CEBAF 6 GeV Physics Program Invited Speaker: Gordon D. Cates Since 1995, the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory has produced a high-current, nearly cw electron beam in the multi GeV range, bringing with it a new era for electron scattering in nuclear physics. Originally planned to be 4 GeV, advances in superconducting radiofrequency (SRF) accelerator technology allowed beam energies up to 6 GeV prior to the recently completed 12 GeV upgrade. The 6 GeV physics program included many highlights that have transformed our understanding of nuclear and nucleon structure. For example, the discovery of unanticipated behavior of the nucleon form factors has altered the prevailing picture of nucleon structure. The measurement of tiny parity-violating asymmetries has both constrained the strangeness content of the nucleon, and provided new insight into the properties of neutron-rich matter. Parity violation has also been used to provide new constraints on the Standard Model. Pioneering measurements of Generalized Parton Distributions (GPDs) and Transverse Momentum Dependent (TMD) distributions have set the stage for multi- dimensional imaging of the nucleon. Measurements of the short-distance-scale interactions between nucleons have shed light on both nuclear structure as well as the behavior of nucleon structure functions when those nucleons are embedded in nuclei. Indeed, the JLab 6 GeV program has deepened our understanding of QCD, and provided motivation for both the 12 GeV upgrade as well as the future Electron Ion Collider. [Preview Abstract] |
Friday, November 8, 2019 9:00AM - 9:30AM |
E02.00003: The 12 GeV Science at the upgraded Jefferson Lab: the new and upcoming results Invited Speaker: Dipangkar Dutta The upgrade of the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab, including the doubling of the energy of the electron beam to 12 GeV, was recently completed. The broad experimental program in all four experimental Halls has begun in earnest and has already produced several exciting new results. An overview of the extensive hadron and nuclear science program underway at the upgraded Jefferson Lab will be presented. The most important results from each of the four experimental Halls will be discussed. [Preview Abstract] |
Friday, November 8, 2019 9:30AM - 10:00AM |
E02.00004: Jefferson Lab’s Pursuit of Nuclear Femtography – from 12 GeV to JLEIC Invited Speaker: ROLF ENT. Nuclear matter is made of quarks that are bound by gluons that also bind themselves. Unlike with the more familiar atomic and molecular matter, the interactions and structures in nuclear matter are inextricably mixed up, and observed properties of nucleons and nuclei, such as mass \& spin, emerge out of this complex system. In order to understand how the properties and structure of nuclear matter emerge from the dynamics of QCD, it is essential to image the gluons and quarks and their interactions (nuclear femtography). This program is initiated at the 12-GeV Upgraded Jefferson Lab, concentrating on imaging the valence-quark region. A new US- based facility, EIC or JLEIC for the design based at Jefferson Lab, with a versatile range of beam energies, polarizations, and species, as well as high luminosity, is required to precisely image the quarks and gluons and their interactions, to explore the new QCD frontier of strong color fields in nuclei – to understand how matter at its most fundamental level is made. The nuclear femtography science foreseen at and the status of the EIC will be presented. [Preview Abstract] |
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