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Coupler Kick

Coupler Kick. Igor Zagorodnov and Martin Dohlus DESY, BDM, 2 April, 2007. y. x. upstream coupler. downstream couplers. 115 o. 150 o. 35 o. Resonator für TESLA TEST Facility (asymmetrisch/mit DESY-HOM-Koopler) 0 93 2214/0.000. Notation and Definitions.

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Coupler Kick

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  1. Coupler Kick Igor Zagorodnov and Martin Dohlus DESY, BDM, 2 April, 2007

  2. y x upstream coupler downstream couplers 115o 150o 35o Resonator für TESLA TEST Facility (asymmetrisch/mit DESY-HOM-Koopler) 0 93 2214/0.000

  3. Notation and Definitions It gives an estimation for the head-tail difference in the kick (banana shape) The picture from R. Wanzenberg, Review of beam dynamics …, Linac Conference, 1996

  4. downstream couplers upstream coupler Wake kick near to the axis

  5. Wake kick near to the axis +

  6. How to compensate the wake kick on the axis? old new We have rotated by 90 degree, but 92.5 is possible better.

  7. + Wake kick for the new orientation

  8. + Wake kick for the new orientation new new old old

  9. downstream coupler, new, zpen/mm=6, forward x/mm =… y/mm=… RF kick

  10. upstream coupler x/mm =… y/mm=… RF kick

  11. TESLA Cavity in Cryomodule Zagorodnov I., Weiland T., The Short-Range Transverse Wakefields in TESLA Accelerating Structure// Proceedings of PAC 2003 Conference, USA, 2003.

  12. European XFEL Project http://www.desy.de/xfel-beam/index.html

  13. cavity wake coupler RF kick coupler wake Injector 5*8=40 couplers Coupler RF kick is the most important. It can be reduced by alternative direction orientation of couplers.

  14. coupler wake cavity wake coupler RF kick Bunch Compressor 12*8=96 couplers Coupler wake is the most important. It can be reduced with the new orientation of HOM couplers.

  15. coupler wake Main Linac 100*8=800 couplers Coupler wake is the most important. It can be reduced with the new orientation of HOM couplers. cavity wake coupler RF kick

  16. cavity wake coupler RF kick coupler wake coupler wake coupler wake cavity wake coupler RF kick Effect of new HOM couplers orientation Injector Bunch Compressor Main Linac Coupler RF kick is the most important. It can be reduced by alternative direction orientation of couplers. Coupler wake kick is the most important. It can be reduced with the new orientation of HOM couplers.

  17. Head-Tail Kick (rms kick)

  18. Head-Tail Kick (rms kick) 1. Transverse Coupler Wake is capacitive (integral from bunch shape) 2. RF Coupler Kick (on crest) 3. Cavity tilt by angle a

  19. cavity wake coupler RF kick coupler wake coupler wake coupler wake cavity wake coupler RF kick Conclusion • Coupler RF kick is a main effect in the injector. It can be compensated by an alternative direction orientation of couplers. • Coupler wake kick is a main effect after the 1st bunch compressor. Rotation of the HOM couplers by 90 degree allows to reduce the kick by factor 12.

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