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MOP1WB03 Current and Future of Storage Ring Based Light Sources in KEK ion, emittance, lattice, dynamic-aperture 17
  • N. Higashi, K. Harada, T. Honda, Y. Kobayashi, N. Nakamura
    KEK, Ibaraki, Japan
  • K. Hirano
    Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan
  KEK has two storage-ring light sources. One is Photon Factory (PF). This is the first storage-ring light source in X-ray region in Japan, and the user-run started in 1983. The ring energy is 2.5 GeV, and the emittance has been reduced to 36 nm·rad from 460 nm·rad through some improvements. Another is Photon Factory Advanced Ring (PF-AR). The ring energy is 6.5 GeV, and the single-bunch operation and hard X-ray are featured. The user-run started in 1987, and the emittance is 293 nm·rad. The magnetic lattice is almost the same as the original one. Now we consider the future plans of KEK light sources. One is the fully new facility applying DQBA lattice, named KEK-LS. The circumstance is 571 m, and the emittance is 315 pm·rad @ 3 GeV and 500 mA. In parallel with that, two plans of the only replacements of the lattices reusing existing tunnels of PF and PF-AR are considered. For the PF upgrade, only the arc lattice will be replaced with a new lattice employing combined bends, and the emittance will be improved to 8 nm·rad from 35 nm·rad. For the PF-AR update, fully replacement will be carried out with a new HMBA lattice, and the expected emittance is 520 pm·rad @ 3 GeV and 500 mA.  
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TUP2WD04 Preliminary Design of HEPS Storge Ring Vacuum Chambers and Components ion, vacuum, storage-ring, radiation 52
  • P. He, B. Deng, D.Z. Guo, Q. Li, B.Q. Liu, Y. Ma, Y.C. Yang, L. Zhang
    IHEP, Beijing, People's Republic of China
  • X.J. Wang
    Institute of High Energy Physics (IHEP), People's Republic of China
  In the design process of HEPS vacuum system, we meet the following limitations. Vacuum chamber must fit inside multipole magnet bore diameter of 25mm (without touching). Water channels and x-ray extraction ports must pass through a 11mm vertical pole gap. Provide an average pressure of 1nTorr during operations with 200mA beam current. Control thermal drift of BPM to ~μm and vibration amplitude ~nm level. Minimize impedance effects. This paper introduces the design of various vacuum chambers, including material selection, mechanical simulation analysis, welding test and so on.  
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TUA2WC02 "LWFA-driven" Free Electron Laser for ELI-Beamlines ion, electron, FEL, undulator 62
  • A.Y. Molodozhentsev, G. Korn, L. Pribyl
    Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic
  • A.R. Maier
    University of Hamburg, Hamburg, Germany
  Free-electron lasers (FEL) are unique light source for different applications on the femto-second scale, including for instance the most basic reaction mechanisms in chemistry, structural biology and condense physics. Laser wake field acceleration (LWFA) mechanism allow to produce extremely short electron bunches of a few fs length with the energy up to a few GeV providing peak current of many kA in extremely compact geometries. This novel acceleration method therefore opens a new way to develop compact "laser-based" FELs. ELI beamlines is an international user facility for fundamental and applied research using ultra-intense lasers and ultra-short high-energy electron beams. In frame of this report we present conceptual solutions for an compact "LFWA" based soft X-ray FEL, which can deliver a photon peak brightness of 1031 ph/sec/mm2/mrad2/0.1%bw. A combination of this achievement with novel laser technologies will open a new perspective for the development of extremely compact FELs with few or even sub-femtosecond photon bunches for a very wide user community.  
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WEP2PT014 Strong Focusing Lattice Design for SSMB ion, lattice, dipole, electron 113
  • T. Rui, X.J. Deng, W.-H. Huang, C.-X. Tang
    TUB, Beijing, People's Republic of China
  • A. Chao
    SLAC, Menlo Park, California, USA
  A storage ring applicable for SSMB operation is a critical part of a high average power SSMB EUV light source. A lattice for SSMB based on longitudinal strong focusing is under design in Tsinghua University. To generate and maintain micro-bunching in a storage ring in this scenario, the momentum compaction has to be small. A lattice with low momentum compaction factor is presented in this work. The lattice of the current design consists of two MBA cells with isochronous unit cells to minimize local and global momentum compaction, and two straight sections for insertion devices. The design energy of the ring is 400MeV and the circumference is 94 meters. Nonlinear effects such as higher order momentum compactions will continue to be optimized.  
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