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Cold vacuum chamber for diagnostics: Analysis of the measurements at the Diamond Light Source and impedance bench measurements

DOI: 10.1103/PhysRevAccelBeams.19.053201 DOI Help

Authors: R. Voutta (IBPT, Karlsruhe Institute of Technology) , S. Gerstl (IBPT, Karlsruhe Institute of Technology) , S. Casalbuoni (IBPT, Karlsruhe Institute of Technology) , A. W. Grau (IBPT, Karlsruhe Institute of Technology) , T. Holubek (IBPT, Karlsruhe Institute of Technology) , D. Saez De Jauregui (IBPT, Karlsruhe Institute of Technology) , R. Bartolini (Diamond Light Source) , M. Cox (Diamond Light Source) , E. Longhi (Diamond Light Source) , G. Rehm (Diamond Light Source) , J. Schouten (Diamond Light Source) , R. P. Walker (Diamond Light Source) , M. Migliorati (University “La Sapienza”) , B. Spataro (INFN-LNF)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Accelerators And Beams , VOL 19

State: Published (Approved)
Published: May 2016

Abstract: The beam heat load is an important input parameter needed for the cryogenic design of superconducting insertion devices. Theoretical models taking into account the different heating mechanisms of an electron beam to a cold bore predict smaller values than the ones measured with several superconducting insertion devices installed in different electron storage rings. In order to measure and possibly understand the beam heat load to a cold bore, a cold vacuum chamber for diagnostics (COLDDIAG) has been built. COLDDIAG is equipped with temperature sensors, pressure gauges, mass spectrometers as well as retarding field analyzers which allow to measure the beam heat load, total pressure, and gas content as well as the flux of particles hitting the chamber walls. COLDDIAG was installed in a straight section of the Diamond Light Source (DLS). In a previous paper the experimental equipment as well as the installation of COLDDIAG in the DLS are described [S. Gerstl et al., Phys. Rev. ST Accel. Beams 17, 103201 (2014)]. In this paper we present an overview of all the measurements performed with COLDDIAG at the DLS and their detailed analysis, as well as impedance bench measurements of the cold beam vacuum chamber performed at the Karlsruhe Institute of Technology after removal from the DLS. Relevant conclusions for the cryogenic design of superconducting insertion devices are drawn from the obtained results.

Subject Areas: Physics

Technical Areas: Accelerator Physics , Insertion Devices