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Ion Effects in the Electron Damping Ring of the International Linear Collider

Description: Ion-induced beam instabilities and tune shifts are critical issues for the electron damping ring of the International Linear Collider (ILC). To avoid conventional ion trapping, a long gap is introduced in the electron beam by omitting a number of successive bunches out of a long train. However, the beam can still suffer from the fast ion instability, driven by ions that last only for a single passage of the electron bunches. Our study shows that the ion effects can be significantly mitigated by… more
Date: July 17, 2006
Creator: Wang, L.; Raubenheimer, T. & Wolski, A.
Partner: UNT Libraries Government Documents Department
open access

The Accelerator Markup Language and the Universal Accelerator Parser

Description: A major obstacle to collaboration on accelerator projects has been the sharing of lattice description files between modeling codes. To address this problem, a lattice description format called Accelerator Markup Language (AML) has been created. AML is based upon the standard eXtensible Markup Language (XML) format; this provides the flexibility for AML to be easily extended to satisfy changing requirements. In conjunction with AML, a software library, called the Universal Accelerator Parser (UA… more
Date: October 6, 2006
Creator: Sagan, D.; Forster, M.; /Cornell U., LNS; Bates, D.A.; /LBL, Berkeley; Wolski, A. et al.
Partner: UNT Libraries Government Documents Department
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Tracking Studies to Determine the Required Wiggler Aperture forthe ILC Damping Rings

Description: The injection efficiency of an ILC damping ring is closely tied to its acceptance. To maximize both, one wants a physical aperture as large as possible in the wiggler magnets, as these are likely to be the limiting physical apertures in the ring. On the other hand, a small aperture in the wiggler magnets is needed to achieve the required field profile, a high magnetic field that is very linear over the whole physical aperture of the magnet. Tracking studies were done for all proposed ILC dampin… more
Date: June 21, 2006
Creator: Reichel, I. & Wolski, A.
Partner: UNT Libraries Government Documents Department
open access

Analysis of KEK-ATF Optics And Coupling Using Orbit Response Matrix Analysis

Description: LOCO is a code for analysis of the linear optics in a storage ring based on the closed orbit response to steering magnets. The analysis provides information on focusing errors, BPM gain and rotation errors, and local coupling. Here, we report the results of an application of LOCO to the KEK-ATF. Although the analysis appears to have provided useful information on the optics of the machine, it appears that one of the main aims of the study--to reduce the vertical emittance by correcting the loca… more
Date: October 13, 2006
Creator: Wolski, A.; Nelson, J.; Ross, M.; Woodley, M. & Mishra, S.
Partner: UNT Libraries Government Documents Department
open access

Simulation of the Electron Cloud for Various Configurations of a Damping Ring for the ILC

Description: In the beam pipe of the positron damping ring of the International Linear Collider (ILC), an electron cloud may be first produced by photoelectrons and ionization of residual gases and then increased by the secondary emission process. This paper reports the assessment of electron cloud effects in a number of configuration options for the ILC baseline configuration. Careful estimates were made of the secondary electron yield threshold for electron cloud build-up, and the related single- and coup… more
Date: June 23, 2006
Creator: Pivi, M.; Wang, L.; Ohmi, K.; Wanzenberg, R.; Wolski, A. & Zimmermann, F.
Partner: UNT Libraries Government Documents Department
open access

Measurements of Intra-Beam Scattering at Low Emittance in the Advanced Light Source

Description: The beam emittance at the interaction point of linear colliders is expected to be strongly influenced by the emittance of the beams extracted from the damping rings. Intra-beam scattering (IBS) potentially limits the minimum emittance of low-energy storage rings, and this effect strongly influences the choice of energy of damping rings [1]. Theoretical analysis suggests that the NLC damping rings will experience modest emittance growth at 1.98 GeV, however there is little experimental data of I… more
Date: March 13, 2006
Creator: Byrd, J.; Corlett, J.; Nishimura, H.; Robin, D.; De Santis, S.; Steier, C. et al.
Partner: UNT Libraries Government Documents Department
open access

Intrabeam Scattering Studies for the ILC Damping Rings Using a NewMATLAB Code

Description: A new code to calculate the effects of intrabeam scattering (IBS) has been developed in MATLAB based on the approximation suggested by K. Bane. It interfaces with the Accelerator Toolbox but can also read in lattice functions from other codes. The code has been benchmarked against results from other codes for the ATF that use this approximation or do the calculation in a different way. The new code has been used to calculate the emittance growth due to intrabeam scattering for the lattices curr… more
Date: June 21, 2006
Creator: Reichel, I. & Wolski, A.
Partner: UNT Libraries Government Documents Department
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