MC2: Photon Sources and Electron Accelerators
A04: Circular Accelerators
Paper Title Page
THPOST001 Temperature Effects on the PETRA III Tunnel Stability 2432
 
  • M. Schaumann, M. Bieler, J. Keil, J. Klute, L. Liao, R. Wanzenberg
    DESY, Hamburg, Germany
  
  The tunnel of the synchrotron light source PETRA III is build from separate segments that are joint together every 24 m. The normal conducting magnets heat up the tunnel when operating, which leads to an expansion of the concrete walls and floor introducing movements between the tunnels segments. Especially during warm-up periods after shutdowns, this results in a drift of the accelerator elements that is transferred on the circulating beam over a duration of days, weeks or months according to the length of the cool-down period. This paper shows that not only inside temperature effects but also seasonal temperature changes are relevant.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST001  
About • Received ※ 07 June 2022 — Accepted ※ 17 June 2022 — Issue date ※ 20 June 2022  
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THPOST003 Collective Effects Estimates for the Damping Ring Design of the FCC-ee 2435
 
  • O. Etisken
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • F. Antoniou, F. Zimmermann
    CERN, Meyrin, Switzerland
  • A. De Santis
    INFN/LNF, Frascati, Italy
  • C. Milardi
    LNF-INFN, Frascati, Italy
  
  The current injector complex design of the FCC-e+e− project consists of e+/e− linacs, which accelerate the beams up to 6 GeV, a damping ring at 1.54 GeV, a pre-booster ring, accelerating the beam up to 16 GeV and a booster synchrotron ring integrated in the collider tunnel accelerating the beams up to the collision energies. The purpose of the damping ring is to accept the 1.54 GeV beam coming from the linac-1, damp the positron/electron beams and provide the required beam characteristics for the injection into the linac-2. In this presentation the current damping ring design is introduced and analytical calculations on various collective effect such as space charge, intra-beam scattering, longitudinal micro-wave instability, transverse mode coupling instability, ion effects, electron cloud and coherent synchrotron radiation, are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST003  
About • Received ※ 08 June 2022 — Revised ※ 15 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 08 July 2022
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THPOST004 EIC’s Rapid Cycling Synchrotron Spin Tracking Update 2439
 
  • V.H. Ranjbar, H. Lovelace III, F. Méot
    BNL, Upton, New York, USA
  • F. Lin
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The Electron Ion Collider (EIC) to be built will collide polarized electrons and ions up to 140 GeV center of mass with a time averaged polarization of 70% and luminosity up to 1034 cm-2 s-1. The EIC’s Rapid Cycling Synchrotron (RCS) will accelerate 2 polarized electrons bunches from 400 MeV to energies of 5, 10 and 18 GeV and inject them into the EIC’s Electron Storage Ring. The design of the RCS has progressed to accommodate a larger magnet free section for the detectors and to meet the space requirements of the RHIC tunnel. We present progress on full 6D spin tracking studies of the RCS with the updated lattice using the Zgoubi code to include magnet misalignments, field errors and corrections as well as radiative effects. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-THPOST004  
About • Received ※ 07 June 2022 — Revised ※ 22 June 2022 — Accepted ※ 24 June 2022 — Issue date ※ 29 June 2022
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