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Lombardi, A.

Paper Title Page
MOHP12

 Permanent Magnet Quadrupole For The 1-St Tank of LINAC-4  

  • S.Minaev, O.Sergeeva, Vl.Skachkov
    SSC of Russian Federation Institute for Theoretical and Experimental Physics, Moscow
  • A.Lombardi, E.Sargsyan, D.Cornuet, W.Venturini
    CERN, Geneva
  • Vic.Skachkov
    NPI at MSU, Moscow

Rare-earth 60 mm diameter, 45 mm long quadrupole for the LINAC-4 focusing channel on the integrated gradient of 2.3 T is described. The thin side washers are used for tuning the quad into specified gradient integral with 0.5 % accuracy. The single washer contribution calculations are discussed. A method of the magnetic axis offset in the REPM quad decreasing down to 30 mm is discussed to exclude its compensation by the outer diameter machining before inserting into the drift tube. Nonlinearity of the field is less than 1 % in the reference range of 75% of beam aperture at the central cross-section near the quad axis. The angular quadrupole arrangement in the drift tube will be provided by machining the main groove on the quad surface in the median plane with 1 mrad accuracy. Calculations of the longitudinal gradient distribution between two closer quadrupoles showed that some percents should be added to the nominal gradient in the beginning of the LINAC-4 focusing channel because of partial field compensation.

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