Conveners
Beams: Parallel I
- Edward Stephenson (Indiana University)
Beams: Parallel II
- Edward Stephenson (Indiana University)
Beams: Parallel III
- Edward Stephenson (Indiana University)
Beams: Parallel IV
- Wolfram Fischer (BNL)
Beams: Parallel V
- Wolfram Fischer (BNL)
Beams: Parallel VI
- Wolfram Fischer (BNL)
Description
Accelerator, Storage and Polarimetry of Polarized Beams
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Haixin Huang (Brookhaven National Lab)26/09/2016, 11:05G. Beams
Currently, Brookhaven AGS (Alternative Gradient Synchrotron) provides 70% proton polarization with 2 × 1011 intensity. This is achieved by two partial snakes to overcome vertical intrinsic and imperfection resonances and a pair of horizontal tune jump system to overcome the week but many horizontal intrinsic resonances. Further gain was achieved by maintain smaller transverse emittance with...
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François Méot (CEA & IN2P3)26/09/2016, 11:30G. Beams
Spin tilt, about 16 and 9 degrees from vertical, in respectivley RHIC Blue and Yellow rings, has been observed during 255 GeV polarized proton RHIC run 13, at the p-carbon polarimeters, about 70 m away from IP12. A possible origin of this y-normal tilt is in a spin rotation angle defect at one of, or both, RHIC helical snakes. This possible cause has been investigated by scanning the rotation...
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Oleg Eyser (Brookhaven National Laboratory)26/09/2016, 11:55G. Beams
The Relativistic Heavy Ion Collider (RHIC) has provided polarized proton-proton collisions to
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experiments for the past decade with beam polarizations of P=55% at beam energies of up to 255 GeV.
The polarization of the proton beams is measured through spin dependent elastic scattering off a
polarized hydrogen jet target and similarly monitored with Carbon fiber targets several times
throughout... -
Andrei Poblaguev (Brookhaven National Laboratory (US))26/09/2016, 12:20G. Beams
The RHIC Run16 included 5 weeks of d-Au Energy Scan. We employed the Polarized Atomic Hydrogen Gas Jet Target (HJET, the absolute polarimeter for RHIC pp program) to measure elastic scattering of polarized protons on deuterium and Gold nuclei at four energies: 10 GeV, 19 GeV, 31 GeV, and 100 GeV. The measurements were performed in parallel with the main RHIC program. Analyzing power, as a...
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Yann Dutheil (Forschungszentrum Julich)26/09/2016, 14:30G. Beams
The COOler SYnchrotron is at the forefront of precise spin dynamics. The facility can accelerate polarized protons at up to 3.7 GeV/c. Numerous specialized devices such as electron coolers, a stochastic cooler and more recently a superconducting solenoidal snake make this accelerator complex unique. As new opportunities and challenges come into perspective of the facility, it calls in...
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Dr Bernd Alfred Lorentz (Forschungszentrum Jülich)26/09/2016, 14:55G. Beams
The construction of the PAX installation was inspired by the idea to make a beam of polarized antiprotons available for future experiments with stored antiproton beams. A spin filtering experiment with internal polarized proton storage cell target was realized using the PAX low-beta installation at COSY. The results of this measurement are in perfect agreement with the FILTEX experiment. Spin...
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Adeleke Adeyemi (Hampton University)26/09/2016, 15:20G. Beams
The PEPPo (Polarized Electrons for Polarized Positrons) experiment at Jefferson Lab (Jlab) investigated a new approach of developing polarized positron source. The PEPPo concept relies on the production of polarized e-/e+ pairs from the bremsstrahlung radiation of a longitudinally polarized electron beam interacting within a high Z conversion target....
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Ivan Koop (Budker Institute of Nuclear Physics (RU))26/09/2016, 15:45G. Beams
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Fanglei Lin (Thomas Jefferson National Accelerator Facility)26/09/2016, 16:40G. Beams
An Electron-Ion Collider (EIC) is proposed as the first lepton- hadron collider in the world with both beams polarized. The envisioned nuclear physics program requires high polarizations, long polarization lifetimes, and unprecedented capabilities of polarization control in both collider rings. The electron polarization must be longitudinal at the interaction points while the light ion...
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Vadim Ptitsyn (Brookhaven National Laboratory)26/09/2016, 17:25G. Beams
An electron-ion collider is being considered as a next large facility for nuclear physics studies in United States. Using polarized beams of electrons, protons, and, possibly, light ions is an essential requirement for this collider. eRHIC, the electron ion collider designed in BNL, takes a big advantage of using existing world-class polarized proton facility RHIC. The polarized electron beam...
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Vahid Ranjbar (Brookhaven National Laboratory)26/09/2016, 17:50G. Beams
We have developed a circular electron accelerator that is free of intrinsic resonances. This lattice
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could be placed in the existing RHIC tunnel and accelerate electrons from 100 MeV to 20 GeV avoiding all major polarization loss usual in such machines. -
Kiel Hock (Brookhaven National Laboratory)27/09/2016, 09:00G. Beams
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Jixie Zhang27/09/2016, 09:25G. Beams
Wide angle compton scattering from polarized protons holds great promise: access to the generalized parton distribution functions He and E with different weighting and moments than in other hard exclusive processes, emphasizing the u-quarks and the valence region. Previously, experiments were proposed using bremsstrahlung from polarized electrons striking a radiator. Unfortunately the mixed...
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Timothy Gay (University of Nebraska)27/09/2016, 09:50G. Beams
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Prof. Alexander Kovalenko (Joint Inst. for Nuclear Research (RU))27/09/2016, 11:05G. Beams
Preparation of the research program at the Nuclotron and the future NICA collider facility is carried out during the last years. The problems of design, construction and tests of new polarized ion source (protons and deuterons), reconstruction of a front end part of the existing linac LU-20, preparation of polarimeters these are current works have been performed within the last few months. In...
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Eremey Valetov (Michigan State University)27/09/2016, 11:30G. Beams
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Richard Talman (Cornell University)27/09/2016, 11:55G. Beams
Authors: R. Talman, Cornell University; J. Grames, R. Kazimi, M. Poelker, R. Suleiman, Thomas Jefferson National Laboratory; B. Roberts, University of New Mexico
It is explained how the CEBAF 123 MeV injection line can serve as one big Stern-Gerlach (S-G) polarimeter measuring the polarization state of the injected beam. No physical changes to the line are required and (though not optimal)...
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Wolfgang Hillert (Universität Bonn)27/09/2016, 12:20G. Beams
In principle, resonant cavities can be excited by magnetic moments of a polarized beam, thus allowing to determine the beam’s polarization by measuring the amplitude of the resonating cavity’s fields. The steady state field amplitude can be determined by calculating the energy transferred from the beam to the resonator’s fields. Analytic formulas for different cavity modes are obtained by...
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Marcel Rosenthal (Forschungszentrum Julich GmbH/RWTH Aachen University)27/09/2016, 14:30G. Beams
Searches for permanent electric dipole moments (EDMs) bear the potential to reveal physics beyond the Standard Model. The JEDI (Jülich Electric Dipole moment Investigation) collaboration explores the prospects for measurements of charged nuclei, i.e. proton, deuteron and Helium-3 EDMs in dedicated storage rings. As an intermediate step, a first direct measurement of the deuteron EDM is planned...
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Jamal Slim (RWTH Aachen)27/09/2016, 14:55G. Beams
The JEDI (Jülich Electric Dipole Investigations) Collaboration aims for measuring the electric dipole moments (EDMs) of charged particles (deuterons and protons) at the COoler SYnchrotron (COSY). To make this possible, a new, high precision novel waveguide RF Wien filter is planned to be integrated in COSY to modulate the spin of deuterons and protons. With a Wien filter, the force of the...
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Edward Stephenson (Indiana University)27/09/2016, 15:20G. Beams
The observation of an electric dipole moment (EDM) or its upper limit at levels near
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10‒29 e cm would either uncover new forms of CP violation or put at risk many models that seek
to explain the excess of matter over anti-matter in the present universe. This talk presents new
results on studies of the feasibility of conducting an EDM search using a polarized deuteron beam
circulating in a... -
Nils Hempelmann (Rheinisch-Westfaelische Tech. Hoch. (DE))27/09/2016, 15:45G. Beams
Permanent electric dipole moments (EDM) in elementary particles would violate CP-symmetry. The JEDI (J¨ulich
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Electric Dipole moment Investigations) collaboration will measure the EDM of charged hadrons using a storage ring.
To keep the spin oscillation in phase with an external frequency, which is a requirement for EDM measurements in
magnetic storage rings, an active feedback system was... -
Zhe Duan (Institute of High Energy Physics, Chinese Academy of Sciences)G. Beams
Transversely polarized e+/e- beams for precision energy calibration and (possi-bly) longitudinally polarized colliding e+/e- beams are critical topics for CEPC operation at lower energy ranges (Z pole and possibly WW threshold). A preliminary study of these aspects is first presented. Then, some Monte Carlo simulation results of a model ring lattice with relevant parameters will also be reported.
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