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wiggler

  
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TUC3MA01 ILC DR Alternative Lattice Design lattice, damping, dynamic-aperture, emittance 94
 
  • Y. Sun, Z. Y. Guo
    PKU/IHIP, Beijing
  • J. Gao
    IHEP Beijing, Beijing
  The International Linear Collider (ILC) which is based on super-conducting RF acceleration technology requires the damping rings to provide beams with extremely small equilibrium emittances, and large acceptance to ensure good injection efficiency for high emittance, high energy spread beam from the positron source. In order to reduce the cost for ILC damping rings, an alternative lattice which is different from the baseline configuration design has been designed with modified FODO arc cells，and the total quadrupole number has been reduced by half. At the same time, to decrease the total cost involved in constructing access shafts needed to supply power, cryogenics etc. for the wigglers and other systems, the number of wiggler sections is decreased from 8 to 4, and further to 2. This new lattice has been optimised to have a good dynamic aperture. This alternative ILC damping ring lattice design will reduce the cost largely compared with the baseline design.  
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TUPMA058 Insertion Devices for SESAME photon, undulator, lattice, brilliance 193
 
  • H. Tarawneh, G. Vignola
    SESAME, Amman
  SESAME is a 3rd generation synchrotron light source that is optimized for the use of Insertion Devices. In this note, the magnetic design for a Hybrid Multipole Wiggler (HMW) and an Elliptically Polarizing Undulator (EPU), proposed for the Phase-I beamlines of SESAME will be presented. Both devices fulfill the electron beam stay clear requirements defined by the SESAME lattice leading to a decent vacuum lifetime. The HMW will provide photon energies from 3-25 keV, which are defined by the scientific case of the SESAME storage ring. The HMW is a hybrid device with period length of 160 mm, a minimum gap of 14.5 mm, maximum flux density of 2.10 Tesla and total magnetic length of 3.04 m. A maximum photon flux density of 1.80×1015 photons/sec/0.1%BW is obtained. The EPU device is required to provide the SESAME users with a variable polarized light and high photon flux over the energy range of 100-1500 eV. The proposed design is of Apple-II type with a period length of 60 mm, a minimum gap of 13 mm and a total magnetic length of 1.782 m. Only the helical mode of operation has been considered where horizontal, vertical and elliptical polarized light can be obtained.  
 
WEPMA068 Comparison of the Methods for Beam Energy Spread Measurement at the VEPP-4M collider, betatron, resonance, electron 416
 
  • A. N. Zhuravlev, V. Kiselev, O. I. Meshkov, N. Yu. Muchnoi, V. V. Smaluk, V. N. Zhilich
    BINP SB RAS, Novosibirsk
  The knowledge of beam energy spread is necessary for the experimental program of VEPP-4M collider. In this report we discuss the application of several diagnostics for studying of this value. We applied the Compton BackScattering (CBS) technique for direct measurement of the energy spread of the beam. The obtained data are compared with the value of the spread derived from the radial and longitudinal beam size as well as from betatron frequencies of the beam. The value of energy spread were determined for set of operating mode of the collider.  
 
THC3MA03 NSLS-II Design: A Novel Approach to Light Source Design emittance, lattice, damping, dipole 613
 
  • S. L. Kramer, J. Bengtsson, S. Krinsky, V. Litvinenko, S. Ozaki
    BNL, Upton, Long Island, New York
  The NSLS-II storage ring will be a replacement for the existing NSLS light source rings, which although innovative when proposed was rapidly overtaken by storage ring design capabilities. NSLS-II design[1] takes a new approach toward providing users with the brightest beams after commissioning and a strategy of evolving to higher brightness beams as more ID devices are installed during its operating period. This is achieved not by pushing the basic lattice to lower emittance, an approach that hits severe limits in the control of the dynamic aperture of an ever increasing non-linear lattice. Our approach is rather to provide the additional emittance reduction naturally with the installation of additional user undulator's or adding high power damping wigglers. Some of the damping wigglers will have variable gap and can be used to maintain a given emittance as the additional user undulators are installed. The details on the lattice design for the high brightness beams and the control of stability of these high power beams is presented.

*ozaki@bnl.gov

 
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