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Belcher, N. T.

Paper Title Page
MOPAS074 Combined Panofsky Quadrupole & Corrector Dipole 602
  • G. H. Biallas, D. Douglas, T. Hiatt, K. Jordan
    Jefferson Lab, Newport News, Virginia
  • N. T. Belcher
    The College of William and Mary, Williamsburg
  Funding: Work supported by the US DOE Contract #DE-AC05-84ER40150, the Office of Naval Research, The Air Force Research Laboratory, the US Army Night Vision Laboratory and the Commonwealth of Virginia,

Two styles of Panofsky Quadrupoles with integral corrector dipole windings are in use in the electron beam line of the Free Electron Laser at Jefferson Lab. We combined the functions into single magnets, adding hundreds of Gauss-cm dipole corrector capability to existing quadrupoles because space is at a premium along the beam line. Superposing high quality dipole corrector field on a high quality, weak (600 to 1'000 Gauss) quadrupole is possible because the parallel slab iron yoke of the Panofsky Quadrupole acts as a window frame style dipole yoke. The dipole field is formed when two current sources, designed and made at Jlab, add and subtract current from the two opposite quadrupole current sheet windings parallel to the dipole field direction. The current sources also drive auxiliary coils at the yoke's inner corners that improve the dipole field. Magnet measurements yielded the control system field maps that characterize the two types of fields. Details of field analysis using OPERA, construction methods, wiring details, magnet measurements and the current sources are presented.