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CSR Microbunching in the Zeuthen-Workshop Benchmark Chicane

CSR Microbunching in the Zeuthen-Workshop Benchmark Chicane. Paul Emma Stanford Linear Accelerator Center July 2, 2002. Chicane CSR Test-Case. Use line-charge CSR    transient model described in LCLS-TN-01-12 … (Stupakov/Emma, Dec. 2001) [same now used in Elegant ] …based on

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CSR Microbunching in the Zeuthen-Workshop Benchmark Chicane

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  1. CSR Microbunching in the Zeuthen-Workshop Benchmark Chicane Paul Emma Stanford Linear Accelerator Center July 2, 2002

  2. Chicane CSR Test-Case Use line-charge CSR   transient model described in LCLS-TN-01-12… (Stupakov/Emma, Dec. 2001) [same now used in Elegant] …based on TESLA-FEL-96-14 (Saldin et al., Nov. 1996) (T566 included, no ISR* added) * incoherent synchrotron radiation

  3. Modulate current and energy profiles li = 75 mm ‘cold’ beam sE/E0 = 210-6 gex0 = 0 mm li = 20 mm ‘cold’ beam sE/E0 = 210-6 gex0 = 0 mm

  4. Vary ‘slice’ emittance and energy spread li = 20 mm gex0=1 mm sd =210-5 gex0=1 mm sd =210-6 gex0=0 mm sd =210-6

  5. ‘cold’ beam “theory”: S. Heifets et al., SLAC-PUB-9165, March 2002 gex=1mm Microbunching Gain sd=210-5 (gex=0) gex=1mm, sd=310-5 wavelength at chicane entrance Berlin-Benchmark 5-GeV Gain Curve

  6. LCLS BC2 CSR Microbunching Gain vs. l gex=1mm ‘cold’ beam Microbunching Gain gex=1mm, sd=310-5 Initial modulation wavelength prior to compressor “theory”: S. Heifets et al., SLAC-PUB-9165, March 2002

  7. Z. Huang: LCLS DL1/BC1/BC2/DL2 SC wiggler OFF SC wiggler ON

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