Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session L2: Study of Hadron Structure using Spin Polarized Beams |
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Sponsoring Units: DPB DNP Chair: Fulvia Pilat, Brookhaven National Laboratory Room: Hyatt Regency Dallas Landmark B |
Sunday, April 23, 2006 3:15PM - 3:51PM |
L2.00001: RHIC: the world's first high energy polarized proton collider Invited Speaker: The Relativistic Heavy Ion Collider (RHIC) at BNL has been providing polarized proton collisions at a beam energy of 100 GeV since 2001. As the world's first polarized proton collider, RHIC is designed to collide polarized protons at a maximum beam energy of 250 GeV and provides a unique opportunity to measure the gluon contribution to the spin of the proton and to study the spin structure of the proton. Unlike other high energy proton colliders, the added challenge for RHIC is to fight the various mechanisms in an accelerator that can lead to partial or total polarization loss due to the interaction of the spin vector with the magnetic fields. In RHIC, two Siberian snakes have been employed to avoid the spin depolarizing resonances driven by vertical closed orbit distortions and vertical betatron oscillations. Currently, polarized proton beams have been accelerated to 100 GeV without polarization loss. Some depolarization has been observed during acceleration from 100 GeV to 205GeV. This talk will report on the progress of the RHIC polarized proton program. Depolarizing mechanisms in RHIC will also be discussed. [Preview Abstract] |
Sunday, April 23, 2006 3:51PM - 4:27PM |
L2.00002: Probing Hadron Structure at Jefferson Lab using Polarized Electron Scattering. Invited Speaker: Almost eighty percent of the present physics program at Jefferson Lab requires polarized electron beams to probe nuclear structure. The accelerator can provide beam to the three experimental halls simultaneously from the same 100 kV DC Gun and GaAs photocathode. Multiple hall operation is a key design feature of the lab that maximizes the physics output. However, multiple hall operation also imposes restrictions on users. For example, only specific beam energies can transfer the full component of longitudinal polarization from the source to multiple halls simultaneously. This talk describes the details of polarized beam delivery to experimental halls and the factors that affect beam quality, particularly those factors relevant for conducting parity violation experiments. In addition, the state-of-the-art and future prospects for higher current and beam polarization will be discussed. [Preview Abstract] |
Sunday, April 23, 2006 4:27PM - 5:03PM |
L2.00003: Upgrades of the Polarized High Intensity Gamma-ray Source at Duke Invited Speaker: The High Intensity Gamma-ray Source (HI$\gamma $S) at the Duke Free Electron Laser Laboratory (DFELL) is operated jointly by the DFELL and the Triangle Universities Nuclear Laboratory. The gamma-ray beam is produced by Compton back scattering of UV photons off high-energy electrons circulating in the storage ring. A distinctive feature of this gamma-ray source is that the Compton scattering occurs inside the optical cavity of a FEL. The gamma-ray beam is nearly 100{\%} polarized and its energy resolution is adjustable by collimation down to 1{\%}. Major upgrades to the accelerators and the UV FEL at the DFELL will be completed in 2006 and 2007, respectively. These upgrades will increase the gamma-ray beam intensity and the capability for extending the energy reach of HI$\gamma $S to slightly beyond the threshold for photoproduction of pions. The upgraded HI$\gamma $S facility will be described and examples of proposed experiments to probe hadron structure using the beam at HI$\gamma $S will be presented. [Preview Abstract] |
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