Design of the PEP-II Low-Energy Ring

Zisman, M.; Yourd, R.; Hsieh, H. C.

doi:10.1109/pac.1995.504710

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…3 and the comparison made in Table III, it can be concluded that in order to achieve the design IP spot size for both ATF2 lattices a better field quality QF1FF should be used, as considered in [28]. To this end, in November of 2012 the QF1FF magnet was replaced by a 4Q17 type quadrupole [29] recycled from the PEPII LER accelerator [30]. The 4Q17 magnet has a better field quality with respect to the previous QF1FF as shown in Table IV.…”

Section: A Final Doublet Replacementmentioning

confidence: 99%

Design and high order optimization of the Accelerator Test Facility lattices

Marín

Tomás

Bambade

et al. 2014

Phys. Rev. ST Accel. Beams

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The Accelerator Test Facility 2 (ATF2) aims to test the novel chromaticity correction scheme which is implemented in the final focus systems of future linear colliders such as the International Linear Collider (ILC) and the Compact Linear Collider (CLIC). The ATF2 nominal and ultralow β Ã lattices are designed to vertically focus the beam at the focal point, or usually referred to as interaction point (IP), down to 37 and 23 nm, respectively. The vertical chromaticities of the nominal and ultralow β Ã lattices are comparable to those of ILC and CLIC, respectively. When the measured multipole components of the ATF2 magnets are considered in the simulations, the evaluated spot sizes at the IP are well above the design values. In this paper we describe the analysis of the high order aberrations that allows identifying the sources of the observed beam size growth. In order to recover the design spot sizes three solutions are considered, namely final doublet replacement, octupole insertion, and optics modification. Concerning the future linear collider projects, the consequences of magnetic field errors of the focusing quadrupole magnet of the final doublet are also addressed.

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Section: A Final Doublet Replacementmentioning

confidence: 99%

Design and high order optimization of the Accelerator Test Facility lattices

Marín

Tomás

Bambade

et al. 2014

Phys. Rev. ST Accel. Beams

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PEP II status and plans

Seeman

Proceedings Particle Accelerator Conference

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The PEP I1 B-Factory project is an e+e-colliding beam storage ring complex to be built on the SLAC site. PEP I1 is designed to provide a luminosity of 3 x 1033 cm-%-l at a center of mass of 10.6 GeV with unequal energy beams of 3.1 and 9.0 GeV. The goal is to study CP violation in the B meson system. The project is being built by a collaboration of the Stanford Linear Accelerator Center, Lawrence Berkeley Laboratory, and Lawrence Livermore National Laboratory. DOE construction authorization was given in 1994. The asymmetric beam energies require two storage rings with the low energy ring (LER) supported above the high energy ring (HER). There will be one interaction point with head-on collisions, requiring magnetic separation of the beams, low values of the beta functions, and magnetic elements inside the solenoid of the BABAR2 physics detector. The high luminosity necessitates a large number of bunches requiring advances in the vacuum design, damped RF cavities, and bunch-by-bunch feedback systems. The injection scheme uses the high current, low emittance, on-energy beams available from the SLAC linac. At present, the old PEP tunnel has been cleared and installation of the high energy ring has started. Several of the many papers on PEP I1 at this conference are listed in References 3-23.

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