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Three-dimensional continuous modeling of beam-electron cloud interaction: Comparison with analytic models and predictions for the present and future circular machinesa)
a)Paper LI2 3, Bull. Am. Phys. Soc. 50, 222 (2005).
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10.1063/1.2198792
/content/aip/journal/pop/13/5/10.1063/1.2198792
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/5/10.1063/1.2198792

Figures

Image of FIG. 1.
FIG. 1.

Normalized wake force at the tail of the bunch versus head offset in vertical plane in a region without dipole magnet for protons in each macroparticle of dimensions . Solid line is the computed wake force by simulation and the points on the line correspond to the computed points. Dotted line is the linearized wake force which matches well with an analytic expression for the wake force which has been proposed by the two macroparticle model.

Image of FIG. 2.
FIG. 2.

Horizontal spot size for different cloud density and synchrotron tunes for the CERN-SPS with kept constant.

Image of FIG. 3.
FIG. 3.

Frequency spectrum of vertical beam centroid motion for the CERN-SPS. The cloud density in the top curve is ; in the middle one it is , and in the bottom one it is .

Image of FIG. 4.
FIG. 4.

Wakefields in the horizontal plane with conducting and periodic boundaries and the beam profile at the tail in the field free region of PEP-II LER.

Image of FIG. 5.
FIG. 5.

Horizontal spot size growth of the beam at PEP-II LER ring for different cloud densities in the field free region.

Image of FIG. 6.
FIG. 6.

Vertical spot size of the beam at PEP-II LER with different cloud densities.

Image of FIG. 7.
FIG. 7.

Horizontal and vertical spot size growth at CERN-LHC in a field free region.

Image of FIG. 8.
FIG. 8.

Electron cloud density profile in horizontal plane: (a) without and (b) with the dipole magnet.

Image of FIG. 9.
FIG. 9.

Horizontal Spot size of the beam at CERN-SPS. (a) No dipole magnet. (b) Dipole lattice included. (c) Uniform dipole field. Initial electron density is .

Image of FIG. 10.
FIG. 10.

Vertical spot size growth of the beam at CERN-SPS. (a) No dipole magnet. (b) Dipole lattice included.

Image of FIG. 11.
FIG. 11.

Electron cloud density contours with and without dipole magnet. (a) Horizontal plane (slice at ) without dipole magnet. (b) Horizontal plane with dipole magnet. (c) Vertical plane without dipole magnet. (d) Vertical plane (slice at ) with dipole magnet.

Image of FIG. 12.
FIG. 12.

Horizontal spot size of the beam at CERN-LHC. (a) No dipole magnet. (b) Dipole lattice included.

Image of FIG. 13.
FIG. 13.

Vertical spot size of the beam at CERN-LHC. (a) No dipole magnet. (b) Dipole lattice included.

Tables

Generic image for table
Table I.

CERN-SPS parameters used in the simulations at injection.

Generic image for table
Table II.

SLAC-PEP-II-LER parameters used for the simulations (see Ref. 21).

Generic image for table
Table III.

CERN-LHC parameters used in the simulations at injection.

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/content/aip/journal/pop/13/5/10.1063/1.2198792
2006-05-30
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Three-dimensional continuous modeling of beam-electron cloud interaction: Comparison with analytic models and predictions for the present and future circular machinesa)
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/5/10.1063/1.2198792
10.1063/1.2198792
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