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Observations of Beam Filamentation at SLM5F02 in Simulation

Observations of Beam Filamentation at SLM5F02 in Simulation. July 22 , 2011 C. Tennant. Procedure. PARMELA model of gun Drive laser parameters based on measurements, assumes ideal distribution 350 keV DC photocathode gun Bunch charge of 135 pC , push 300K particles

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Observations of Beam Filamentation at SLM5F02 in Simulation

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  1. Observations of Beam Filamentation at SLM5F02 in Simulation July 22, 2011 C. Tennant

  2. Procedure • PARMELA model of gun • Drive laser parameters based on measurements, assumes ideal distribution • 350 keV DC photocathode gun • Bunch charge of 135 pC, push 300K particles • PARMELA model of merger • Use Excel (no space charge) to set quads for match to linac • Tweak quads to improve match in PARMELA (with space charge) • PARMELA model of the linac(acceleration) • Accelerate 10° before crest • Space charge effects still appreciable in first module, use Excel to set transverse match in the triplets (where space charge is small) • elegant model of the recirculator • include 1D CSR model and implement “csrdrifts” (allows CSR wake to propagate beyond dipole) • Run to middle of second p-bend  SLM5F02

  3. Recall: Beam-based Measurements (view in Slideshow mode to view animated GIF)

  4. st,wiggler = 418.7 fs under-compressed

  5. st,wiggler = 343.7 fs under-compressed

  6. st,wiggler = 269.2 fs under-compressed

  7. st,wiggler = 195.5 fs under-compressed

  8. st,wiggler = 126.0 fs under-compressed

  9. st,wiggler = 73.9 fs fully compressed

  10. st,wiggler = 83.0 fs over-compressed

  11. st,wiggler = 142.2 fs over-compressed

  12. st,wiggler = 213.6 fs over-compressed

  13. st,wiggler = 288.3 fs over-compressed

  14. st,wiggler = 364.6 fs over-compressed

  15. Energy and stvs QT2F08/9 Strength over-compressed under-compressed

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