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Electromagnetic vs. Permanent Magnet Quadrupoles Heinz-Dieter Nuhn, SLAC / LCLS June 28, 2004

Electromagnetic vs. Permanent Magnet Quadrupoles Heinz-Dieter Nuhn, SLAC / LCLS June 28, 2004. Pros for designs NLC Prototype (30 being produced for Orion) LCLS Design. Permanent Magnet vs. Electromagnetic Quadrupoles. Pros of Permanent Magnet Quadrupoles

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Electromagnetic vs. Permanent Magnet Quadrupoles Heinz-Dieter Nuhn, SLAC / LCLS June 28, 2004

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  1. Electromagnetic vs. Permanent Magnet QuadrupolesHeinz-Dieter Nuhn, SLAC / LCLSJune 28, 2004 • Pros for designs • NLC Prototype (30 being produced for Orion) • LCLS Design Heinz-Dieter Nuhn, SLAC / LCLS

  2. Permanent Magnet vs. Electromagnetic Quadrupoles • Pros of Permanent Magnet Quadrupoles • Reduced cost (No plumbing, no power supplies and cabling) • Reduced space requirements • Sufficient for baseline design • Not subject to power supply failures or instabilities.(Low gradients would amplify trajectory error amplitudes) • Pros of Electromagnetic Quadrupoles • Allows to measure beam kicks due to quadruple offsets after Beam Based Alignment Procedure to • as additional measure to verify BBA • as means to track field errors. • Allow for inclusion of dipole trim windings for fine control of quad center Heinz-Dieter Nuhn, SLAC / LCLS

  3. NCL Quadrupole (Isometric Draft) Heinz-Dieter Nuhn, SLAC / LCLS

  4. NLC Quadrupole (Isometric View) Heinz-Dieter Nuhn, SLAC / LCLS

  5. NCL Quadrupole (Front View) Heinz-Dieter Nuhn, SLAC / LCLS

  6. SLAC Electrical Discharge Machine (EDM) Used like jig saw but producing smooth surfaces. Heinz-Dieter Nuhn, SLAC / LCLS

  7. NLC Quadrupole (Measurement Bench Arrangement) Heinz-Dieter Nuhn, SLAC / LCLS

  8. NLC Prototype Quadrupole Heinz-Dieter Nuhn, SLAC / LCLS

  9. NLC Prototype Quadrupole (Side View) Heinz-Dieter Nuhn, SLAC / LCLS

  10. NLC Prototype Quadruple (Rear View) Heinz-Dieter Nuhn, SLAC / LCLS

  11. SLAC EM Quad Design (Carl Rago) • The NLC Electric Quad was designed a number of years ago attempting to demonstrate that a 20% change in field, during beam based alignment, would produce a magnetic center shift of less than 1 micron. This has been repeatedly demonstrated by this prototype near maximum field. At lower operating fields the center shift increases with a 20% change but remains under 2 microns. • This quad is in competition with Fermilab’s development of an adjustable permanent magnet which I believe has yet to reach the design goal but is making significant progress. [Might be too weak for the LCLS] • This prototype was also designed to address manufacturing and reliability improvements suggested to the standard SLAC quad design. The changes included: • EDM profiling of a monolithic core assembly • High current ‘quick disconnect’ electrical terminals • Round copper conductor with ‘quick wound’ racetrack coils • I believe that this design concept can be successfully adjusted to the needs of the Undulator. The design and prototype was produced for about 11K$. In a quantity of 30 this should be a very cost effective component. Heinz-Dieter Nuhn, SLAC / LCLS

  12. Undulator Electromagnetic Quad Isometric View Extend of larger radius windings can be reduced. Including 1 trim winding on each quadrant for additional dipole correction, equivalent to 16 microns displacement. Heinz-Dieter Nuhn, SLAC / LCLS

  13. Electromagnetic Quad Design Specifications ( Carl Rago) Heinz-Dieter Nuhn, SLAC / LCLS

  14. Conclusions • Going from permanent magnet to electromagnetic quads appears feasible. • Needs cost estimate and refined design. Heinz-Dieter Nuhn, SLAC / LCLS

  15. End of Presentation Heinz-Dieter Nuhn, SLAC / LCLS

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