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Beam Dynamics in Low Energy Part of XFEL Accelerator

Beam Dynamics in Low Energy Part of XFEL Accelerator. ( Intermediate report ). V. Tsakanov for CANDLE (Armenia). XFEL Beam Dynamics Group Meeting , 17 Dec 2007. Contents. Misalignments in Accel1 Misalignments in Injector Linac Coupler wake field effects Coupler RF field effects Summary.

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Beam Dynamics in Low Energy Part of XFEL Accelerator

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  1. Beam Dynamics in Low Energy Part of XFEL Accelerator ( Intermediate report) V. Tsakanov for CANDLE (Armenia) XFEL Beam Dynamics Group Meeting , 17 Dec 2007

  2. Contents • Misalignments in Accel1 • Misalignments in Injector Linac • Coupler wake field effects • Coupler RF field effects • Summary

  3. 5 MeV ACCEL1 ~100 MeV 8 cavities 12 MV/m LINAC1 ~100 MeV ~500 MeV 4 TESLA Modules ~ 12MV/m Parameter list Bunch Charge – 1nC Bunch rms length – 2mm Normalized emittance – 1mm*mrad

  4. 5 MeV ACCEL1 ~100 MeV 8 cavities 12 MV/m ACCEL 1 Beam init. offset x0=0.5mm

  5. ACCEL1 – Emittance Dilution Cavity misalignment RMS -0.5 mm Cavity random tilts RMS – 0.5 mrad

  6. Coupler Wakes I.Zagorodnov, M.Dohlus, 04. 2007

  7. Coupler Kick Parameters: Wake and RF field I.Zagorodnov, M.Dohlus, 04. 2007

  8. For linear approximation of W(s): K~ Krms • Scaling with accel grad and bunch length for Coupler RF Krf ~ Vcav*σz Ko=66.4 V/nC/cav Krms=38.4 V/nC/cav RF kick for U=12 MV/m, σ=2 mm Monopole term Krms=1.8 V/nC/mm/cav Ko=3.0 V/nC/mm/cav Dipole term

  9. Coupler Wakes Monopole term Ko=-2.5 V/nC/cavity Krms=1.4 V/nC/cavity Dipole term Krms=1.3 V/nC/mm/cav Ko=2.25 V/nC/mm/cav

  10. Coupler RF Field Monopole term Ko=66.4 V/nC/cavity Krms=38.4 V/nC/cavity Dipole term Krms=1.8 V/nC/mm/cav Ko=3.0 V/nC/mm/cav U=15 MV/m, σ=2.4 mm

  11. LINAC1 ~100 MeV ~500 MeV 4 TESLA Modules ~ 12MV/m LINAC1 W. Decking

  12. Components errors Beam initial offset 1 sigma ~0.35 mm Cavity & Modules misalignment RMS offset- 0.5mm Modules Cavity

  13. Cavity tilts Beam trajectory Emittance dilution

  14. Coupler Wakes Monopole term Ko=-2.5 V/nC/cavity Krms=1.4 V/nC/cavity Dipole term Krms=1.3 V/nC/mm/cav Ko=2.25 V/nC/mm/cav

  15. Coupler RF Field Monopole term Ko=66.4 V/nC/cavity Krms=38.4 V/nC/cavity Dipole term Krms=1.8 V/nC/mm/cav Ko=3.0 V/nC/mm/cav

  16. Summary • Coupler RF Field effects ACCEL1 – 5-100 MeV Emittance growth - 14 % Linac 1 – 100-500 MeV Emittance growth – 5% • Other effects - below 1%

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