| Paper |
Title |
Page |
| TUOCKI03 |
Observations and Modeling of Beam-Beam Effects at the Tevatron Collider
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725 |
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- A. Valishev, Y. Alexahin, V. A. Lebedev, R. S. Moore, V. D. Shiltsev
Fermilab, Batavia, Illinois
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This report summarizes recent experience with beam-beam effects at the Tevatron collider. Improvements in the beam life time resulting from implementation of the new helical orbit are analyzed. Effects of second order chromaticity correction and beam-beam compensation with Electron Lenses are studied.
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Slides
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| TUOCKI04 |
Experimental Demonstration of Beam-Beam Compensation by Tevatron Electron Lenses and Prospects for the LHC
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728 |
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- V. D. Shiltsev, Y. Alexahin, V. Kamerdzhiev, G. F. Kuznetsov, X. Zhang
Fermilab, Batavia, Illinois
- K. Bishofberger
LANL, Los Alamos, New Mexico
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We report the first experimental demonstration of compensation of beam-beam interaction effects with use of electron beams. Long-range and head-on interactions of high intensity proton and antiproton beams have been dominating sources of beam loss and lifetime limitations in the Tevatron in Collider Run II (2001-present). Electron lense acting on proton bunches has doubled their lifetime by compensating beam-beam interaction with antiprotons. We present results of the experiments, operational details and discuss possibilities of using electron lenses for beam-beam compensation in LHC.
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Slides
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| TUPMN106 |
MCP based Electron Gun
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1159 |
| |
- V. D. Shiltsev
Fermilab, Batavia, Illinois
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We propose to use micro-channel plate (MCP) as a cathode for electron guns. We suggest possible arrangement of MCP in DC and RF guns and discuss feasibility and possible advantages of the method.
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| TUPAN091 |
LHC Beam-beam Compensation Using Wires and Electron Lenses
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1589 |
| |
- U. Dorda, F. Zimmermann
CERN, Geneva
- W. Fischer
BNL, Upton, Long Island, New York
- V. D. Shiltsev
Fermilab, Batavia, Illinois
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We present weak-strong simulation results for a possible application of current-carrying wires and electron lenses to compensate the LHC long-range and head-on beam-beam interaction, respectively, for nominal and Pacman bunches. We show that these measures have the potential to considerably increase the beam-beam limit, allowing for a corresponding increase in peak luminosity
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| TUPAS024 |
Experimental and Simulation Studies of Beam-Beam Compensation with Tevatron Electron Lenses
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1703 |
| |
- V. Kamerdzhiev, Y. Alexahin, V. D. Shiltsev, A. Valishev, X. Zhang
Fermilab, Batavia, Illinois
- D. N. Shatilov
BINP SB RAS, Novosibirsk
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Initially the Tevatron Electron Lenses (TELs) were intended for compensation of the beam-beam effect on the antiproton beam. Owing to recent increase in the number of antiprotons and reduction in their emittance, it is the proton beam now that suffers most from the beam-beam effect. We present results of beam studies, compare them with the results of computer simulations using LIFETRAC code and discuss possibilities of further improvements of the Beam-Beam Compensation efficiency in the Tevatron.
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| TUPAS025 |
Commissioning of the Second Tevatron Electron Lens and Beam Study Results
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1706 |
| |
- V. Kamerdzhiev, R. J. Hively, G. F. Kuznetsov, H. Pfeffer, G. W. Saewert, V. D. Shiltsev, X. Zhang
Fermilab, Batavia, Illinois
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In the framework of Fermilab's Beam-Beam Compensation project the second Tevatron Electron Lens (TEL2) has been installed in the Tevatron during Spring 2006 shutdown. After successful commissioning a series of beam studies has been carried out in single bunch mode. The paper describes the commissioning process and first beam studies results.
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| TUPAS033 |
Field Fluctuation and Beam Screen Vibration Measurements in the LHC Magnets
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1724 |
| |
- V. D. Shiltsev
Fermilab, Batavia, Illinois
- T. Kroyer, R. de Maria
CERN, Geneva
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We present experimental methods and results of magnetic field fluctuation and beam screen vibration measurements in the LHC magnets. These noises can lead to an emittance grwoth in proton beams if they have spectral components at the betatron lines. A preliminary estimates of the effects are given.
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| WEPMN097 |
A Solid State Marx Generator for TEL2
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2257 |
| |
- V. Kamerdzhiev, H. Pfeffer, G. W. Saewert, V. D. Shiltsev, D. Wolff
Fermilab, Batavia, Illinois
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The solid-state Marx generator modulates the anode of the electron gun to produce the electron beam pulses in the second Tevatron Electron Lens (TEL2). It is capable of driving the 60 pf terminal with 600ns pulses of up to 6 kV with a p.r.r. of 50 kHz. The rise and fall times are 150 ns. Stangenes Industries developed the unit and is working on a second version which will go to higher voltage and have the ability to vary its output in 396 ns intervals over a 5 us pulse.
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| THPMN110 |
The MANX Muon Cooling Demonstration Experiment
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2969 |
| |
- K. Yonehara, D. R. Broemmelsiek, M. Hu, A. Jansson, V. D. Shiltsev
Fermilab, Batavia, Illinois
- R. J. Abrams, M. A.C. Cummings, R. P. Johnson, S. A. Kahn, T. J. Roberts
Muons, Inc, Batavia
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Funding: Supported in part by DOE STTR grant DE-FG02-06ER86282
MANX is an experiment to prove that effective six-dimensional (6D) muon beam cooling can be achieved a Helical Cooling Channel (HCC) using ionization-cooling with helical and solenoidal magnets in a novel configuration. The aim is to demonstrate that 6D muon beam cooling is understood well enough to plan intense neutrino factories and high-luminosity muon colliders. The experiment consists of the HCC magnets that envelop a liquid helium energy absorber, upstream and downstream instrumentation to measure the particle or beam parameters before and after cooling, and emittance matching sections between the detectors and the HCC. We describe and compare the experimental configuration for both single particle and beam profile measurement techniques based on G4Beamline simulations.
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| THPAN074 |
Space-Charge Compensation Options for the LHC Injector Complex
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3390 |
| |
- F. Zimmermann, M. Aiba, M. Chanel, U. Dorda, R. Garoby, J.-P. Koutchouk, M. Martini, E. Metral, Y. Papaphilippou, W. Scandale
CERN, Geneva
- G. Franchetti
GSI, Darmstadt
- V. D. Shiltsev
Fermilab, Batavia, Illinois
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Space-charge effects have been identified as the most serious intensity limitation in the CERN PS and PS booster, on the way towards ultimate LHC performance and beyond. We here explore the application of several previously proposed space-compensation methods to the two LHC pre-injector rings, for each scheme discussing its potential benefit, ease of implementation, beam-dynamics risk, and the R&D programme required. The methods considered include tune shift and resonance compensation via octupoles, nonlinear chromaticity, or electron lenses, and beam neutralization by an electron cloud, plasma or negative ions.
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