A Study of the Effect of Beam-Beam Interactions on CESR Optics

Crittenden, J.; Billing, M.; Rubin, D.

doi:10.1109/pac.2005.1590732

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…Many calculations of the coherent tune shift in CESR-TA have been performed and compared with data [20], with a great deal of success. These calculations were done in 2D using POSINST or ECLOUD [21], and included the drift and dipole regions of the ring.…”

Section: Coherent Tune Shift Caused By the Electron Cloudmentioning

confidence: 99%

“…The location of the bunch at each z determines the formation of the electron cloud there, so a simulation of the electron cloud buildup must be done for any given bunch centroid offset for which we want to know the cloud's electric field at the beam. Therefore, following the procedure devised by Dugan and used in the Cornell simulations [20], in order to find the field gradient experienced by the beam, two electron cloud buildup simulations are done, one with the beam offset by þ2 mm (e.g., in y, for the calculation of the y tune shift) and one with an offset of À2 mm. The field gradient is calculated assuming the field of the electron cloud is linear in y (or x, for the x tune shift).…”

Section: Coherent Tune Shift Caused By the Electron Cloudmentioning

confidence: 99%

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Electron cloud dynamics in the Cornell Electron Storage Ring Test Accelerator wiggler

Celata

2011

Phys. Rev. ST Accel. Beams

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The interference of stray electrons (also called ''electron clouds'') with accelerator beams is important in modern intense-beam accelerators, especially those with beams of positive charge. In magnetic wigglers, used, for instance, for transverse emittance damping, the intense synchrotron radiation produced by the beam can generate an electron cloud of relatively high density. In this paper the complicated dynamics of electron clouds in wigglers is examined using the example of a wiggler in the Cornell Electron Storage Ring Test Accelerator experiment at the Cornell Electron Storage Ring. Three-dimensional particle-in-cell simulations with the WARP-POSINST computer code show different density and dynamics for the electron cloud at locations near the maxima of the vertical wiggler field when compared to locations near the minima. Dynamics in these regions, the electron cloud distribution vs longitudinal position, and the beam coherent tune shift caused by the wiggler electron cloud will be discussed.

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Section: Coherent Tune Shift Caused By the Electron Cloudmentioning

confidence: 99%

Section: Coherent Tune Shift Caused By the Electron Cloudmentioning

confidence: 99%

Electron cloud dynamics in the Cornell Electron Storage Ring Test Accelerator wiggler

Celata

2011

Phys. Rev. ST Accel. Beams

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“…Electrostatic separators provide a horizontal pretzel orbit in the arcs and vertical pretzel orbit in the interaction region to prevent the bunches from colliding. Calculations of the lattice properties due to the horizontal parasitic crossings predicts three-fold symmetry so that trains 1, 4, 7, and 2, 5, 8, and 3, 6, 9 have identical optical properties due to their identical horizontal parasitic crossings [1].…”

Section: Chess Vertical Beam Dynamicsmentioning

confidence: 97%

Study of turn-by-turn vertical beam dynamics at low and high energy cesr operation

Holtzapple

Kern

Codner

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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Presently, the Cornell Electron-Positron Storage Ring (CESR) is operated at two different beam energies: low energy (E=2GeV) for high energy physics (CESR-c), and high energy (E=5.3GeV) for synchrotron radiation production for the Cornell High Energy Synchrotron Source (CHESS). The electron and positron bunches' vertical dynamics at these two energies are vastly different, in part due to the change in the pretzel orbit, the presence of wiggler magnets at low energy, and synchrotron radiation power at two different energies. Using a 32 channel photomultiplier array and a beam position monitor (BPM), vertical beam dynamics were measured on a turn-by-turn basis during CHESS and CESR-c operation as well as dedicated machine studies time. For these studies, electron cloud effects such as vertical tune shift and vertical beam size blow-up along the electron and positron trains are quantified at these two vastly different beam energies.

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“…1. The 100-m-long RF straights can accommodate as many as 16 single-cell cavities and the 226-m wiggler straight up to 60 superferric wiggler magnets [9].…”

Section: Design Of the Positron Damping Ring Latticementioning

confidence: 99%

Investigation into electron cloud effects in the International Linear Collider positron damping ring

Crittenden

Conway

Dugan

et al. 2014

Phys. Rev. ST Accel. Beams

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We report modeling results for electron cloud buildup and instability in the International Linear Collider positron damping ring. Updated optics, wiggler magnets, and vacuum chamber designs have recently been developed for the 5 GeV, 3.2-km racetrack layout. An analysis of the synchrotron radiation profile around the ring has been performed, including the effects of diffuse and specular photon scattering on the interior surfaces of the vacuum chamber. The results provide input to the cloud buildup simulations for the various magnetic field regions of the ring. The modeled cloud densities thus obtained are used in the instability threshold calculations. We conclude that the mitigation techniques employed in this model will suffice to allow operation of the damping ring at the design operational specifications.

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A Study of the Effect of Beam-Beam Interactions on CESR Optics

Cited by 3 publications

References 3 publications

Electron cloud dynamics in the Cornell Electron Storage Ring Test Accelerator wiggler

Electron cloud dynamics in the Cornell Electron Storage Ring Test Accelerator wiggler

Study of turn-by-turn vertical beam dynamics at low and high energy cesr operation

Investigation into electron cloud effects in the International Linear Collider positron damping ring

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