Bulletin of the American Physical Society
2019 Fall Meeting of the APS Division of Nuclear Physics
Volume 64, Number 12
Monday–Thursday, October 14–17, 2019; Crystal City, Virginia
Session EE: Mini-Symposium: Towards a US Electron Ion Collider: Physics, Accelerator, and Detectors |
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Chair: Ernst Sichtermann, Lawrence Berkeley National Laboratory Room: Salon 5 |
Tuesday, October 15, 2019 8:30AM - 9:06AM |
EE.00001: Status of Electron Ion Collider designs and R&D Invited Speaker: Andrei A. Seryi A U.S.-based Electron-Ion Collider (EIC) has recently been endorsed by the U.S. National Academies of Sciences, Engineering, and Medicine (NAS). This brings the realization of such a collider another step closer, after its earlier recommendation in the 2015 Long-Range Plan for U.S. nuclear science of the Nuclear Science Advisory Committee ``as the highest priority for new facility construction following the completion of FRIB''. Moreover a CD0 is expected to be announced by DOE in 2019. An EIC will be an unprecedented collider that will need to maintain high luminosity (1E33-1E34 cm-2 s-1) over a very wide range of Center-of- Mass energies (~20 GeV to ~100 GeV, upgradable to ~140 GeV), while accommodating highly polarized beams and many different ion species. A multi-laboratory collaboration is presently working on two site-specific EIC designs - eRHIC led by Brookhaven National Laboratory and JLEIC led by Jefferson Lab. The present talk will summarize the status of Electron Ion Collider designs and R&D. [Preview Abstract] |
Tuesday, October 15, 2019 9:06AM - 9:18AM |
EE.00002: Tagged Short-Range Correlations for Medium to Heavy Ions Douglas Higinbotham Understanding short-range correlations between pairs of nucleons in the nucleus (SRC) is an important nuclear physics topic that can address longstanding mysteries in nuclear physics such as the behavior of dense nuclear systems and the modification of parton distributions. As a collider and with a large acceptance detector, the EIC has unique capabilities that are complementary to previous SRC studies, most notably the ability to more fully reconstruct the final state. Making use of the BeAGLE (Benchmark eA Generator for LEptoproduction) simulation code as well as recent advances in SRC phenomenological parameterizations, we are exploring this potential and determine the optimal machine energies for much studies. [Preview Abstract] |
Tuesday, October 15, 2019 9:18AM - 9:30AM |
EE.00003: ABSTRACT WITHDRAWN |
Tuesday, October 15, 2019 9:30AM - 9:42AM |
EE.00004: Measuring Tensor Spin Observables with the EIC Karl Slifer, Elena Long Several experiments at Jefferson Lab are planned which will explore the tensor structure of spin-1 systems. Conventional nuclear mechanisms can not explain the existing data measured for the tensor structure function $b_1$. E12-13-011 will measure $b_1$ using a solid deuterated polarized target, probe the tensor-polarized quark and antiquark distribution functions, and potentially provide a unique and unambiguous signature of hidden color. E12-15-005 will measure the tensor asymmetry $A_{zz}$ in the $x>1$ region, to explore the nature of short-range correlations in nuclei. This provides a unique tool to experimentally constrain the ratio of the S- and D-state wavefunctions at large momentum, which has been an ongoing theoretical issue for decades. The Electron Ion Collider is a natural facility to extend and improve these measurements. We will discuss the feasibility of measuring tensor spin observables at the EIC and compare the potential EIC measurements to world data and the planned Jefferson Lab experiments. [Preview Abstract] |
Tuesday, October 15, 2019 9:42AM - 9:54AM |
EE.00005: Jets at the Electron-Ion Collider Miguel Arratia The EIC will be the first e-A collider and will produce the first jets in nuclear DIS. Jets will enable new type of studies of nuclei that extend beyond traditional single-hadron measurements. These studies may help us understand the structure and behavior of nuclei in terms of quarks and gluons—a key goal of modern nuclear physics. In particular, jets from nuclear DIS will shed light on quark-matter interactions, the quark-to-hadron transition, and the quark structure of nuclei. DIS offers us the ultimate arena for these studies with controlled quark kinematics and flavor as well as medium length and density. In this talk, I will discuss the prospects of measurements such as lepton-jet correlations, flavor-tagged jets, and jet substructure variables that could exploit the unprecedented combination of hermetic tracking, PID and calorimetry of the EIC detectors. [Preview Abstract] |
Tuesday, October 15, 2019 9:54AM - 10:06AM |
EE.00006: Exploring Jet Observables at an EIC with the JETSCAPE Framework Kolja Kauder The JETSCAPE collaboration recently version 2.0 of an innovative modular event generator and simulation framework with a unified interface and a comprehensive suite of model implementations for all stages of ultra-relativistic heavy ion collisions. The framework's modularity and agnosticism regarding the underlying physics assumptions make it a promising platform for developing Monte Carlo models of electron-ion collisions specifically because it allows to concentrate on one aspect at a time, such as medium interaction or hadronization, while leaving other modules unchanged. An overview of necessary modifications and baseline performance for electron+proton collisions will be presented, as well as a first look at possible jet modification observables in e+nucleus collisions. [Preview Abstract] |
Tuesday, October 15, 2019 10:06AM - 10:18AM |
EE.00007: Full Acceptance Interaction Region Design of JLEIC V.S. Morozov, R. Ent, Y. Furletova, B. Gamage, F. Lin, T. Michalski, R. Rajput-Ghoshal, M. Wiseman, R. Yoshida, Y. Zhang, Y. Cai, Y. Nosochkov, M. Sullivan, G.-L. Sabbi Nuclear physics experiments envisioned at a proposed future Electron-Ion Collider (EIC) require high luminosity of 10$^{\mathrm{33}}$-10$^{\mathrm{34}}$ cm$^{\mathrm{-2}}$s$^{\mathrm{-1}}$ and a full-acceptance detector capable of reconstruction of a whole electron-ion collision event. The particles associated with the initial ion tend to go at very small angles and have small rigidity offsets with respect to the initial ion beam. They are detected after they pass through large apertures of the final focusing quadrupoles. To maximize the luminosity, the final focusing quadrupoles must be placed as close to the interaction point as possible. Together these requirements presents serious detection, optics and engineering design challenges. We present a design of a full-acceptance interaction region of Jefferson Lab Electron-Ion Collider (JLEIC). The talk presents how this design addresses the above requirements up to an ion momentum of 200 GeV/c. We summarize the magnet parameters, which are kept consistent with the Nb-Ti superconducting magnet technology. [Preview Abstract] |
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