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Vacuum System for the Diamond Light Source DDBA Upgrade

DOI: 10.18429/JACoW-IPAC2017-WEPVA136 DOI Help

Authors: M. P. Cox (Diamond Light Source) , M. J. Duignan (Diamond Light Source) , R. Howard (Diamond Light Source) , S. C. Lay (Diamond Light Source) , A. G. Miller (Diamond Light Source) , H. S. Shiers (Diamond Light Source) , A. J. Wolfenden (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: IPAC2017
Peer Reviewed: No

State: Published (Approved)
Published: May 2017

Open Access Open Access

Abstract: One cell of the Diamond Light Source (Diamond) storage ring was upgraded in late 2016 to a Double Double Bend Achromat (DDBA) configuration to provide an additional mid-achromat insertion device straight. For practical reasons it was decided to use discrete non-evaporable getter (NEG) pumps rather than NEG coatings. This paper outlines the vacuum design of the up-grade, the reasons for the choices made and the vacuum simulation tools used as well as describing the vacuum system engineering, assembly, installation and commissioning. The measured vacuum performance is found to be in close agreement with the simulations and a simple expression is derived for the beam gas lifetime.

Journal Keywords: vacuum; dipole; simulation; electron; photon

Subject Areas: Technique Development

Technical Areas: Vacuum