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multipole

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MOP026 A Novel Alignment Procedure for the Final Focus of Future Linear Colliders alignment, coupling, linear-collider, collider 109
 
  • A. Latina
    Fermilab, Batavia
  • P. Raimondi
    INFN/LNF, Frascati (Roma)
  
 

An algorithm for the simultaneous optimization of orbit, dispersion, coupling and beta-beating in the final focus of future linear colliders is presented. Based on orbit and dispersion measurements the algorithm determines the optimal corrector settings in order to simultaneously minimize the r.m.s orbit, the r.m.s dispersion, the r.m.s coupling, the r.m.s. beta-beating and the r.m.s strength of the dipoles correctors. A number of different options for error handling of beam position monitors, weighting, and correction have been introduced to ensure the stability of the algorithm. A sextupole tuning procedure is also applied to further optimize the beam parameters at the interaction point. Preliminary results for the beam delivery systems of CLIC are presented.

  
MOP105 Preparation of Adjustable Permanent Magnet Quadrupole Lens for Beam Test at ATF2 quadrupole, permanent-magnet, coupling, vacuum 307
 
  • S. Ushijima, H. Fujisawa, Y. Iwashita, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • M. Masuzawa, T. Tauchi
    KEK, Ibaraki
  
 

A permanent magnet quadrupole lens with continuously adjustable strength originally designed by Gluckstern was fabricated for a final focus. It consists of five PMQ discs that rotate on their axis, where odd and even numbered discs rotate oppositely but with the same absolute angle. By setting their lengths appropriately, the coupling between x and y components can be minimized. In order to reduce multipole components higher than quadrupole, we adjust positions of magnet wedge pairs. At the same time we improve differences between the magnetic center and the mechanical center of the PMQ discs by measuring harmonics of fields in magnets. In order to carry out the beam test, a high precision movable table for the lens system is also fabricated. This table can evacuate the lens system from the beam line completely without vacuum breaking, which should ease the evaluation of the system at decreased strength region.

  
TUP062 Development of a Quadrupole Magnet for CSNS DTL quadrupole, DTL, linac, ion 551
 
  • X. Yin, S. Fu, K.Y. Gong, J. Peng, Q.L. Peng, Y.C. Xiao, B. Yin
    IHEP Beijing, Beijing
  
 

In the 324MHz CSNS Drift Tube Linac, the electromagnetic quadrupoles will be used for transverse focusing. The R&D of the quadrupole for the lower energy section of the DTL is a critical issue because the size of the drift tube at this section is so small that it is not possible to apply the conventional techniques for the fabrication. Then the electromagnetic quadrupoles containing the SAKAE coil and a drift tube prototype containing an EMQ have been developed. In this paper, the details of the design, the fabrication process, and the measurement results for the quadrupole magnet are presented.

  
THP077 Development of PteqHI rfq, space-charge, simulation, emittance 923
 
  • J.M. Maus, R.A. Jameson, A. Schempp
    IAP, Frankfurt am Main
  
 

For the development of high energy and high duty cycle RFQs accurate particle dynamic simulation tools are important for optimizing designs, especially in high current applications. To describe the external fields in RFQs as well as the internal space charge fields with image effect, the Poisson equation has to be solved taking the boundary conditions into account. In PteqHI a multigrid Poisson solver is used to solve the Poisson equation. This method will be described and compared to analytic solutions for the Two-term-potential to verify the answer of the Poisson solver.