Low Energy Ring lattice of the PEP-II asymmetric B-factory

Cai, Yunhai; Donald, M.; Helm, R.; Irwin, J.; Nosochkov, Y.; Ritson, D.; Yan, Yunxiang; Forest, E.; Zholents, A.

doi:10.1109/pac.1995.504724

Cited by 7 publications

(8 citation statements)

References 4 publications

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“…For dynamical aperture concerns, values less than 10 −3 are not significant because a particle must be lost within 10 3 turns without radiation damping, otherwise the growth will be damped. [23] This is why I present absolute fitting errors instead of relative errors. We see that the fitting is consistently improving and converges to the original map as the fit-map order increases.…”

Section: )mentioning

confidence: 99%

Model Independent Analysis of Beam Centroid Dynamics in Accelerators

Chun-xi¹

2003

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Section: )mentioning

confidence: 99%

Model Independent Analysis of Beam Centroid Dynamics in Accelerators

Chun-xi¹

2003

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“…The low-beta optics of the LER [3] is much more complicated than in the HER due to the vertical separation the rings and the local chromatic module in the IR. Similar data has been taken and analyzed.…”

Section: Magnetsmentioning

confidence: 99%

Beam-Based Solenoid Compensation for the PEP-II

Cai¹

1999

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Commissioning the compensation system of the solenoid in the BaBar detector presents a challenging problem due to the complexity of the system, which uses twelve normal quadrupoles and twelve skew quadrupoles in each ring. The setting of these skew quadrupoles needs to be readjusted according to the machine optical parameters since the machines always have some unknown errors. In this paper, we will describe a beam based method to match the coupling and optics in the interaction region to compensate for the optical eaeects due to the solenoid. The method has been successfully used to aend the wrong polarities and the wrong scaling factor of the skew quadrupoles in the early stage of the commissioning. It is being reaened to set the skew quadrupoles in the machines in order to reduce the beam size at the interaction point and improve the luminosity o f PEP-II. AbstractCommissioning the compensation system of the solenoid in the BaBar detector presents a challenging problem due to the complexity of the system, which uses twelve normal quadrupoles and twelve skew quadrupoles in each ring. The setting of these skew quadrupoles needs to be readjusted according to the machine optical parameters since the machines always have some unknown errors. In this paper, we will describe a beam based method to match the coupling and optics in the interaction region to compensate for the optical effects due to the solenoid. The method has been successfully used to find the wrong polarities and the wrong scaling factor of the skew quadrupoles in the early stage of the commissioning. It is being refined to set the skew quadrupoles in the machines in order to reduce the beam size at the interaction point and improve the luminosity of PEP-II.

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“…Chromaticity correction is done by means of a "semi-local" scheme [2], with a pair of horizontal sextupoles located in the IR straight section on each side of the interaction point. (Because the two beams collide head on with magnetic separation close to the IP, and because the LER beam must be raised above the plane of the HER in the rest of the collider, dispersion is present in much of IR-2.)…”

Section: Lattice Designmentioning

confidence: 99%

Design of the PEP-II Low-Energy Ring

Zisman

Yourd

Hsieh

Proceedings Particle Accelerator Conference

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The PEP-II Project, a collaboration of SLAC, LBL, and LLNL, began construction in January 1994. Since the Conceptual Design Report (CDR) [1] was issued in June 1993, considerable progress has been made at refining and optimizing the Low-Energy Ring. Lattice design has progressed considerably, with solutions obtained for the chromatic correction of the IR and new, more relaxed, parameters for the required wigglers. Based on the latter change, the number of RF stations was reduced from 5 to 4. A new concept for the arc vacuum system has been adopted, based on an antechamber configuration with discrete photon stops pumped by titanium sublimation pumps. Designs for the arc dipoles and quadrupoles have been developed in collaboration with IHEP (Beijing) and these magnets are now being fabricated there. A new configuration for the high-power wiggler photon dumps has been developed and is in the detailed design phase.

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Low Energy Ring lattice of the PEP-II asymmetric B-factory

Cited by 7 publications

References 4 publications

Model Independent Analysis of Beam Centroid Dynamics in Accelerators

Model Independent Analysis of Beam Centroid Dynamics in Accelerators

Beam-Based Solenoid Compensation for the PEP-II

Design of the PEP-II Low-Energy Ring

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