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2014•HZB Repository (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB))Open access

The Low-alpha Lattice and Bunch Length Limits at BESSY-VSR

P. Goslawski, Markus Ries, Martin Ruprecht, G. Wüstefeld

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Abstract

An upgrade of the BESSY II ring to a Variable bunch length Storage Ring BESSY^{V}SR has been recently proposed *, by introducing strongly focusing superconducting cavities. This will allow to store simultaneously long and short bunches. In the regular user optics, bunch lengths of 15 ps (rms) and down to 1.5 ps (rms) are expected. Bunches as short as 300 fs (rms), close to the bunch length limit, and a ring current of 3.5 mA at the bunch bursting threshold can be provided by using a modified low-alpha optics. This presentation will discuss the properties of the low-alpha optics and intrinsic bunch length limits, given by coupling effects of the longitudinal and horizontal plane.

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What this paper is about

An upgrade of the BESSY II ring to a Variable bunch length Storage Ring BESSY^{V}SR has been recently proposed *, by introducing strongly focusing superconducting cavities. This will allow to store simultaneously long and short bunches. In the regular user optics, bunch lengths of 15 ps (rms) and down to 1.5 ps (rms) are expected. Bunches as short as 300 fs (rms), close to the bunch length limit, and a ring current of 3.5 mA at the bunch bursting threshold can be provided by using a modified low-alpha optics. This presentation will discuss the properties of the low-alpha optics and intrinsic bunch length limits, given by coupling effects of the longitudinal and horizontal plane.

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Available abstract

An upgrade of the BESSY II ring to a Variable bunch length Storage Ring BESSY^{V}SR has been recently proposed *, by introducing strongly focusing superconducting cavities. This will allow to store simultaneously long and short bunches. In the regular user optics, bunch lengths of 15 ps (rms) and down to 1.5 ps (rms) are expected. Bunches as short as 300 fs (rms), close to the bunch length limit, and a ring current of 3.5 mA at the bunch bursting threshold can be provided by using a modified low-alpha optics. This presentation will discuss the properties of the low-alpha optics and intrinsic bunch length limits, given by coupling effects of the longitudinal and horizontal plane.

Key concepts: Bunches, Physics, Synchrotron, Upgrade, Optics, Storage ring, Particle accelerator, Synchrotron radiation

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