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Plate, D. W.

Paper Title Page
MOPAS025 Conceptual Design of ILC Damping Ring Wiggler Straight Vacuum System 488
 
  • S. Marks, K. Kennedy, D. W. Plate, D. Schlueter, M. S. Zisman
    LBNL, Berkeley, California
  
  Funding: U. S. Department of Energy, Contract No. DE-AC02-05CH11231.

The positron and electron damping rings for the ILC (International Linear Collider) will contain long straight sections consisting of twenty wiggler/quadrupole pairs. The wigglers will be based upon the CESR-C superconducting design* . There are a number of challenges associated with the design of the wiggler straight vacuum system, in particular, the absorption of photon power generated by the wigglers. This paper will present the overall conceptual design of the wiggler straight vacuum system developed for the ILC RDR. Particular emphasis will be placed on photon power load calculations and the absorber design.

* A. Mihailichenko, Optimized Wiggler Magnet for CESR, Proceedings of PAC2001, Chicago, Il, June 18-22, 2001

 
TUPMN115 Creating a Pseudo Single Bunch at the ALS 1182
 
  • G. J. Portmann, K. M. Baptiste, W. Barry, J. Julian, S. Kwiatkowski, L. Low, D. W. Plate, D. Robin
    LBNL, Berkeley, California
  
  Funding: This work was supported by U. S. Department of Energy under Contract No. DE-AC03-76SF00098.

Typically storage ring light sources operate with the maximum number of bunches as possible with a gap for ion clearing. By evenly distributing the beam current the overall beam lifetime is maximized. The Advanced Light Source (ALS) has 2 nanoseconds between the bunches and typically operates with 276 bunches out of a possible 328. For experimenters doing timing experiment this bunch separation is too small and would prefer to see only one or two bunches in the ring. In order to provide more flexible operations and substantially increase the amount of operating time for time-of-flight experimenters, it is being proposed to kick one bunch on a different vertical closed orbit. By spatially separating the light from this bunch from the main bunch train in the beamline, one could potentially have single bunch operation all year round. By putting this bunch in the middle of the ion clearing gap the required bandwidth of the kicker magnets is reduced. Using one kicker magnet running at the ring repetition rate (1.5 MHz), this bunch could be permanently put on a different closed orbit. Using multiple kicker magnets, this bunch could be locally offset at an arbitrary frequency.