| Paper |
Title |
Other Keywords |
Page |
| TUPLT154 |
Aperture Studies for the Fermilab AP2 Anti-proton Line
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lattice, antiproton, kicker, injection |
1491 |
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- I. Reichel, M. Placidi, M.S. Zisman
LBNL, Berkeley, California
- K. Gollwitzer, S. Werkema
Fermilab, Batavia, Illinois
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The AP2 beamline transports anti-protons from the production target to the Debuncher ring. In the past the observed aperture has been smaller than that estimated from linear, on-energy optics. We have investigated possible reasons for the aperture limitation and have identified possible sources, including residual vertical dispersion from alignment errors and chromatic effects due to very large chromatic lattice functions. Some experiments have already been performed to study these effects. We present results of the experimental and theoretical studies and possible remedies.
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| TUPLT192 |
Transition Crossing for the BNL Super Neutrino Beam
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beam-losses, lattice, proton, injection |
1583 |
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- J. Wei, N. Tsoupas
BNL, Upton, Long Island, New York
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The super neutrino beam facility proposed at the Brookhaven National Laboratory requires proton beams to cross the transition energy in the AGS to reach 1 MW beam power at top energy. High intensity beams are accelerated at a fast repetition rate. Upon transition crossing, such high intensity bunches of large momentum spreads suffer from strong nonlinear chromatic effects and self-field effects. Using theoretical and experimental methods, we determine the impact of these effects and the effectiveness of transition-jump compensation schemes, and determine the optimum crossing scenario for the super neutrino beam facility.
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| WEPLT174 |
Higher Order Hard Edge End Field Effects
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multipole, lattice, focusing, dynamic-aperture |
2236 |
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- J.S. Berg
BNL, Upton, Long Island, New York
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In most cases, nonlinearities from magnets must be properly included in tracking and analysis to properly compute quantities of interest, in particular chromatic properties and dynamic aperture. One source of nonlinearities in magnets that is often important and cannot be avoided is the nonlinearity arising at the end of a magnet due to the longitudinal variation of the field at the end of the magnet. Part of this effect is independent of the shape of the end. It is lowest order in the body field of the magnet, and is the result of taking a limit as the length over which the field at the end varies approaches zero. This is referred to as a hard edge" end field. This effect has been computed previously to lowest order in the transverse variables. This paper describes a method to compute this effect to arbitrary order in the transverse variables, under certain constraints. The results of using this hard edge model are compared with performing the computation with finite-length end fields, as well as to the lowest-order hard-edge end field model.
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