| Paper |
Title |
Page |
| MOPLS058 |
eRHIC - Future Machine for Experiments on Electron-ion Collisions
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676 |
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- V. Ptitsyn, J. Beebe-Wang, I. Ben-Zvi, A.V. Fedotov, W. Fischer, W. Graves, V. Litvinenko, W.W. MacKay, C. Montag, S. Ozaki, T. Roser, S. Tepikian, D. Trbojevic
BNL, Upton, Long Island, New York
- D.P. Barber
DESY, Hamburg
- W.A. Franklin, R. Milner, B. Surrow, C. Tschalaer, E. Tsentalovich, D. Wang, F. Wang, A. Zolfaghari, T. Zwart, J. van der Laan
MIT, Middleton, Massachusetts
- A.V. Otboev, Y.M. Shatunov
BINP SB RAS, Novosibirsk
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The paper presents recent developments for the design of the high luminosity electron-ion collider, eRHIC, proposed on the basis of the existing RHIC machine. The goal of eRHIC is to provide collisions of electrons and positrons on ions and protons in the center-of-mass energy range from 30 to 100 GeV. Lepton beams as well as the beam of protons (and, possibly, light ions) should be polarized. Two independent designs are under development, the so-called 'ring-ring' and 'linac-ring' options. The 'ring-ring' option is based on a 10 GeV electron storage ring. The design issues for the 'ring-ring' option are similar to those at existing B-factories. In the 'linac-ring' option, the electron beam is accelerated in a 10 GeV recirculating energy recovery linac. This option may provide higher luminosities (> 1·1033 cm-2s-1 for e-p collisions), but requires considerable R&D studies for a high current electron polarized source. In order to maximize the collider luminosity, ion ring upgrades, such as electron cooling and ion beam intensity increase, are considered.
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| TUZBPA01 |
The ERL High Energy Cooler for RHIC
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940 |
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- I. Ben-Zvi
BNL, Upton, Long Island, New York
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This talk will first briefly review high-energy electron cooling, including the recent results from Fermilab. The main empasis will be on describing the proposed electron-cooling device for RHIC, based on an Energy Recovery Linac. Finally, results from the prototype ERL will presented.
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Transparencies
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| WEPLS025 |
Multi-bunch Plasma Wakefield Experiments at the Brookhaven National Laboratory Accelerator Test Facility
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0 |
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- P. Muggli, E.K. Kallos, T.C. Katsouleas
USC, Los Angeles, California
- M. Babzien, I. Ben-Zvi, K. Kusche, P.I. Pavlishin, I. Pogorelsky, D. Stolyarov, V. Yakimenko
BNL, Upton, Long Island, New York
- W.D. Kimura
STI, Washington
- F. Zhou
UCLA, Los Angeles, California
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In the plasma wakefield accelerator (PWFA), a short particle bunch or train of bunches drives a large amplitude relativistic plasma wave or wake. The wake has both transverse, focusing fields, and longitudinal fields that can accelerate trailing particles or a trailing bunch. In this experiment conducted at BNL-ATF, a CO2 laser driven IFEL modulates the energy of the 65 MeV, 1.5 ps electron bunch, which after a drift creates a train of bunches approximately 3 fs long, separated by the laser wavelength (10.6 μm or about 30 fs). The largest wake amplitude is reached when the plasma wavelength is equal to the bunch spacing: n=1·1019 e-/cc. In this case, the bunch train drives a wake with an amplitude of approximately 7 GV/m in an ablative capillary discharge plasma. This wake amplitude is much larger than that previously observed with the un-bunched beam*. With this multi-bunch PWFA scheme, the energy of an appropriately phased trailing bunch could be multiplied by a large factor, of the order of the number of drive bunches. Experimental results including plasma density diagnostic using Stark broadening, beam bunching using CTR and energy gain and loss measurements will be presented.
*V. Yakimenko et al., Phys. Rev. Lett. 91, 014802 (2003).
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| THPLS092 |
Nb-Pb Superconducting RF-Gun
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3493 |
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- J.S. Sekutowicz, J.I. Iversen, D. Klinke, D. Kostin, W.-D. Möller
DESY, Hamburg
- I. Ben-Zvi, A. Burrill, T. Rao, J. Smedley
BNL, Upton, Long Island, New York
- M. Ferrario
INFN/LNF, Frascati (Roma)
- P. Kneisel
Jefferson Lab, Newport News, Virginia
- K. Ko, L. Xiao
SLAC, Menlo Park, California
- J. Langner, P. Strzyzewski
The Andrzej Soltan Institute for Nuclear Studies, Centre Swierk, Swierk/Otwock
- R.S. Lefferts, A.R. Lipski
SBUNSL, Stony Brook, New York
- J.B. Rosenzweig
UCLA, Los Angeles, California
- K. Szalowski
University of Lodz, Lodz
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We report on the status of an electron RF-gun made of two superconductors: niobium and lead. The presented design combines the advantages of the RF performance of bulk niobium superconducting cavities and the reasonably high quantum efficiency of lead, as compared to other superconducting metals. The concept, mentioned in a previous paper, follows the attractive approach of all niobium superconducting RF-gun as it has been proposed by the BNL group. Measured values of quantum efficiency for lead at various photon energies, analysis of recombination time of photon-broken Cooper pairs for lead and niobium, and preliminary cold test results are discussed in this paper.
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