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Calculation of XFEL injector with PARMELA C é cile Limborg-Déprey, SLAC August 18, 2003

Calculation of XFEL injector with PARMELA C é cile Limborg-Déprey, SLAC August 18, 2003. Beamline description Comparison of Parameters To do list. Description XFEL injector. Description TTF 2 beamline.

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Calculation of XFEL injector with PARMELA C é cile Limborg-Déprey, SLAC August 18, 2003

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  1. Calculation of XFEL injector with PARMELA Cécile Limborg-Déprey, SLACAugust 18, 2003 • Beamline description • Comparison of Parameters • To do list Cécile Limborg-Déprey, SLAC

  2. Description XFEL injector Cécile Limborg-Déprey, SLAC

  3. Description TTF 2 beamline z = 0 z = 0.25m z = 2.32m z = 13.36 m z =16.1 m z = 19 m 1nC 20ps square pulse with 3s rising edge 3 mm diameter uniform transverse laser pulse Thermal emittance , Ekin=0.55 eV 40MV/m Solenoid 1.6 kG Cécile Limborg-Déprey, SLAC

  4. Tuning with PARMELA to match ASTRA output RF Phase Tuning Define reference particle  center of bunch Define reference phase  maximum energy Cécile Limborg-Déprey, SLAC

  5. Reference Particle in PARMELA at center of bunch Cécile Limborg-Déprey, SLAC

  6. ASTRA PARMELA Summary of results Good agreement Emittance (mm.nrad) 1.38 (PARM.) / 1.28 (ASTRA) Sigma_x (mm) 0.4 (PARM.) / 0.35 (ASTRA) Perfect agreement on bunch length and energy Cécile Limborg-Déprey, SLAC

  7. Summary of results in gun Very Good agreement Small discrepancy in emittance Cécile Limborg-Déprey, SLAC

  8. At 0.25m (Gun Exit) Cécile Limborg-Déprey, SLAC

  9. At 14 m Cécile Limborg-Déprey, SLAC

  10. At 19 m Cécile Limborg-Déprey, SLAC

  11. +10% +10% Sensitivity TTF2 +10% +10% LCLS Cécile Limborg-Déprey, SLAC

  12. Conclusion • Good agreement between codes • Same field maps, initial distribution • Same algorithm • Only variation : meshing • To-do-list : comparison of injectors • Operating range • S ensitivity studies • Tolerances on Bfield, Efield, Ecell1/Ecell2 ,Gunphase, Charge , Acc. Fields, Phases • Tolerance on mis-positioning of components Cécile Limborg-Déprey, SLAC

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