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Fite, J.M.

Paper Title Page
MO6PFP005 Steering Magnet Design for a Limited Space 136
 
  • M. Okamura, J.M. Fite, V. Lo Destro, D. Raparia, J. Ritter
    BNL, Upton, Long Island, New York
  
 

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.


A steering magnet is not a major component in a beam line, however it is usually needed in any real set up. Also it is hard to estimate the required field strength before the beam line construction, since the strength needed is determined by misalignnment errors of other devises. Sometimes it is difficult to find enough space to install steering magnets because of other constraints on the length of the beamline. We compare two extreme designs of steering magnets. The first one is very thin steering magnet design which occupies only 6 mm in length and can be additionally installed as needed. The other is realized by applying extra coil windings to a quadrupole magnet and does not consume any length. We will present both designs in details and will discuss pros and cons.

  
MO6RFP027 Results of LEBT/MEBT Reconfiguration at BNL 200 MeV Linac 411
 
  • D. Raparia, J.G. Alessi, B. Briscoe, J.M. Fite, O. Gould, A. Kponou, V. Lo Destro, M. Okamura, J. Ritter, A. Zelenski
    BNL, Upton, Long Island, New York
  
 

The low energy (35 keV) and medium energy (750 keV) transport lines for (un)polarized H- have been reconfigured to reduce beam losses and the beam emittance out of the 200 MeV Linac. The medium energy line in the original layout was 7 m long, and had ten quadrupoles, two beam choppers, and three bunchers. The bunchers were necessary to keep the beam bunched at the entrance of the Linac. About 35% beam loss occurred, and the emittance growth was several fold. In the new layout, the 750 keV line is only 0.7 m long, with three quads and one buncher. To preserve beam polarization in the 35 keV line, the solenoid in front of the RFQ (35 keV to 750 keV) was replaced with an Einzel lens. To reduce the spin-precession in the LEBT, which may cause the depolarization, a 47.4 degree bend was removed and focusing solenoid in front of RFQ was replaced with an Einzel lens. We will present the experimental result of the upgrade.