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Preliminary Tracking Results through LCLS-II P. Emma et al. , Oct. 23, 2013

Preliminary Tracking Results through LCLS-II P. Emma et al. , Oct. 23, 2013. Thanks to Mark Woodley and Yuri Nosochkov for MAD design work Use Christos Papadopoulos ASTRA run at 100 pC (95 MeV, ‘symmetric’) Run Elegant with 250 k macro-particles (CSR, L-wakes, 2 nd order optics)

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Preliminary Tracking Results through LCLS-II P. Emma et al. , Oct. 23, 2013

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  1. Preliminary Tracking Results through LCLS-II P. Emma et al., Oct. 23, 2013 • Thanks to Mark Woodley and Yuri Nosochkov for MAD design work • Use Christos Papadopoulos ASTRA run at 100 pC (95 MeV, ‘symmetric’) • Run Elegant with 250 k macro-particles (CSR, L-wakes, 2nd order optics) • Send output to FEL simulators (Y. Ding, G. Marcus, J. Wu) – next week? • Latest results from M. Venturini (LBNL)

  2. LCLS-II Layout (drawn only approximately to scale)

  3. ASTRA Tracking Results for LCLS-II Injector (NGLS) Bunch Charge 0.1nC UV pulse length (FWHM) 33ps Spot diam. On cathode 0.77 mm Peak Current (95 MeV) 12 A Compression factor 3 - Buncher Gradient 3.7 MV/m Buncher Phase -84.5deg CM01 Grad (cav. 1) 10.9 MV/m CM01 Grad (cav. 2) 3.3 MV/m CM01 Grad (cav. 3-7) 15.5 MV/m CM01 Grad (cav. 8, spare) 0 Christos Papadopoulos (LBNL)

  4. Elegant Tracking Results for Full LCLS-II (SXR) BC2 BC1 Mark Woodley, Yuri Nosochkov (SLAC) Optics across the entire LCLS-II, from exit of the CM01 injector cryo-module (95 MeV) to the start of the SXR undulator at 4 GeV.

  5. Elegant Tracking: Electron Energy 4 GeV SXR undulator entrance 95 MeV Electron energy across the entire LCLS-II, from exit of the CM01 injector cryo-module (95 MeV) to the start of the SXR undulator at 4 GeV.

  6. Elegant Tracking: Bunch Length & Energy Spread RW-wall wake of 2.4-km bypass line added all at one point here RMS bunch length (blue) and rms relative energy spread (magenta) across LCLS-II, from exit of the CM01 injector cryo-module (95 MeV) to the start of the SXR undulator at 4 GeV.

  7. Before Laser Heater (95 MeV) After Laser Heater (95 MeV) (6 keV rms added) After BC1 (250 MeV) After BC2 (1.6 GeV) CSR At SXR entrance (4 GeV) (includes wake of bypass)

  8. Elegant Tracking: Projected Emittance Dog-Leg 1 BC2 Dog-Leg 2 CSR effects not minimized at all yet (see M. Venturini slides next) Hor. (black) and vertical (blue) emittance across LCLS-II, from exit of the CM01 injector cryo-module (95 MeV) to the start of the SXR undulator at 4 GeV.

  9. Elegant Tracking: Sliced Emittance and Energy Spread 4 GeV at SXR FEL entrance gex,y 0.3 mm CSR sE/E 0.012% (500 keV) rms 4 GeV at SXR FEL entrance (heater at 6 keV)

  10. Recent Studies by Marco Venturini (LBNL) • Reduced BC2 |R56|, larger HL voltage • Settle for 850 A rather than 1 kA • Re-matched beam 850 A

  11. Marco’s Version Marco’s Version Emma Version Emma Version

  12. Summary • We are in reasonable shape for the CDR • FEL simulations still needed: • SXR SASE & Self-Seeded (G. Marcus) • HXR SASE (Y. Ding) • HXR Self-Seeded (J. Wu) • m-bunching study needed: • Analytical estimate (A. Marinelli, Z. Huang) • IMPACT study (J. Qiang – later?) • Might also try Marco’s latest, if time allows • Much more to study/improve after CDR

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