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CALCULATIONS OF THE LCLS INJECTOR USING ASTRA Jean-Paul Carneiro DESY Hamburg

CALCULATIONS OF THE LCLS INJECTOR USING ASTRA Jean-Paul Carneiro DESY Hamburg ICFA Future Light Sources Sub-Panel Mini Workshop on Start-to-End Simulations of X-RAY FELs DESY Zeuthen, 18 August 2003. LCLS ACCELERATOR SCHEMATIC. RF GUN. L01. Linac-X L = 0.6 m. L02. Undulator L = 120 m.

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CALCULATIONS OF THE LCLS INJECTOR USING ASTRA Jean-Paul Carneiro DESY Hamburg

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  1. CALCULATIONS OF THE LCLS INJECTOR USING ASTRA Jean-Paul Carneiro DESY Hamburg ICFA Future Light Sources Sub-PanelMini Workshop on Start-to-End Simulations of X-RAY FELs DESY Zeuthen, 18 August 2003

  2. LCLS ACCELERATOR SCHEMATIC RF GUN L01 Linac-X L = 0.6 m L02 Undulator L = 120 m 35 Deg Linac-1 L = 9 m Linac-2 L = 330 m Linac-3 L = 550 m …existing linac BC 1 BC 2 From LCLS Conceptual Design Report Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  3. LCLS INJECTOR RF GUN + SOLENOID SOLENOID L01 L02 9.4 M Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  4. RF GUN (SUPERFISH SIMULATIONS) 4.2 cm 15 cm RF GUN PARAMETERS • 1.6 cells, π-mode, 2856 MHz • 120 MV/m, ~ 9 MW • 120 Hz, ~ 3 µs • symmetric RF gun, 1 µm at 1.0 nC CATHODE • Cu (possibly Mg) • 12 mm usable diameter, QE > at 263 nm Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  5. SOLENOIDS (POISSON SIMULATIONS) • Emittance compensating solenoid : max Bz = 0.27235 T at 18.9 cm • L01 solenoid : max Bz = 0.748 T Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  6. ASTRA • For PARMELA / ASTRA comparisons : 30 000 particles • For ELEGANT input : 200 000 particles, 12 digits • Space charge calculation : N_rad = 20, N_long=60  N_rad = 60 µm, N_long=50 µm, automatic adjustment of the mesh with the bunch. • Increment step : min = 0.1 ps and max = 5 ps. Automatic adjustment of the increment step. Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  7. LCLS LASER (ASTRA GENERATOR OUTPUTS, 2E5 p.) • Transverse distribution : uniform, r = 1.2 mm • Longitudinal distribution : uniform, L=10 ps with 0.7 ps rise times • Thermal emittance : 0.6 mm-mrad per mm radius (Cu cathodes) From TELSA-FEL 97-01 (K. Floettmann) : Longitudinal distribution Transverse distribution Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  8. PHASE SCAN OF LCLS AND TESLA XFEL WITH ASTRA • LCLS: 120 MV/m, 0.27235 T, L= 10 ps + 0.7 ps rise time, r = 1.2 mm • TESLA XFEL : 40 MV/m, 0.163 T, L = 20 ps + 3 ps rise time, r =1.5 mm Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  9. LONG. PHASE SPACE AT GUN EXIT (15 CM) • Phase laser in ASTRA (and PARMELA) : + 32 Deg ASTRA GUN FIELD = 120 MV/m ASTRA GUN FIELD = 120.15 MV/m HEAD HEAD TAIL TAIL Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  10. GUN EXIT (15 CM) Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  11. GUN EXIT (15 CM) Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  12. GUN EXIT (15 CM) Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  13. GUN EXIT (15 CM) Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  14. GUN EXIT (15 CM) – RESUME • PARMELA and ASTRA with 30 000 particles • PARMELA & ASTRA : 120 MV/m, 0.27235 T, L =10 ps + 0.7 ps rise time, r =1.2 mm 0.15% 14% 5% 16% 2% Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  15. ACCELERATING SECTIONS L01 & L02 • L01 & L02 : 3 m S-Band sections, 84 cells per section, TWS • L01 located at 1.4 m and L02 at 5.4 m (from photo-cathode) • PARMELA : uses TRWAVE for L01 & L02, with product of the average axial electric field in MV/m and the transit-time time factor T. For L01 : and for L02: • ASTRA : uses the maximum field of the TW Emax • From SUPERFISH : Superfish simulation of one TW cell Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  16. ENERGY GAIN ALONG LCLS INJECTOR PARMELA : 149.96 MeV/c ASTRA : 149.14 MeV/c (0.5 %) Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  17. EXIT L01(4.46 M) Long. Phase Space for 3 phases of L01 Phase ASTRA L01 at +5.5 Deg HEAD HEAD MAX FIELD L01 = 24.0 MV/m MAX FIELD L01= 24.025 MV/m TAIL TAIL Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  18. EXIT L01(4.46 M) Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  19. EXIT L02 (8.42 M) Long. Phase Space for 3 phases of L01 Phase ASTRA L01 at -2.5 Deg MAX FIELD L02 = 40.66 MV/m MAX FIELD L02 = 40.68 MV/m HEAD HEAD TAIL TAIL Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  20. EXIT L02 (8.42 M) Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  21. EMITTANCE & SIZE ALONG LCLS INJECTOR Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  22. ENERGY SPREAD & BUNCH LENGTH ALONG LCLS INJECTOR Jean-Paul Carneiro CALCULATIONS OF THE LCLS INJECTOR USING ASTRA

  23. EXIT L01 (4.46 M) – RESUME (0.22%) (4%) (0.35%) (7%) (10%) (7%) (3%) Jean-Paul Carneiro ASTRA SIMULATIONS OF THE LCLS INJECTOR

  24. EXIT L02 (8.42 M) – RESUME (0.5 %) (6%) (10%) (2 %) (10%) (2 %) (2%) Jean-Paul Carneiro ASTRA SIMULATIONS OF THE LCLS INJECTOR

  25. DISTRIBUTION AT 9.4 M ( FOR ELEGANT) • Comparison ASTRA output at 9.4 m with elegant input of S2E workshop … HEAD TAIL TAIL HEAD Jean-Paul Carneiro ASTRA SIMULATIONS OF THE LCLS INJECTOR

  26. DISTRIBUTION AT 9.4 M ( FOR ELEGANT) HEAD HEAD TAIL TAIL Jean-Paul Carneiro ASTRA SIMULATIONS OF THE LCLS INJECTOR

  27. CONCLUSION • GOOD AGREMENT BETWEEN ASTRA AND PARMELA FOR THE LCLS INJECTOR • JITTER STUDIES NEED TO BE DONE Jean-Paul Carneiro ASTRA SIMULATIONS OF THE LCLS INJECTOR

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