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Normal Laser Incidence on Cathode D. H. Dowell, SLAC LCLS Week July 19, 2005

Normal Laser Incidence on Cathode D. H. Dowell, SLAC LCLS Week July 19, 2005. Grazing vs. Normal Incidence Issues Grazing Incidence Technical Risk Schemes for Normal Incidence Wakes Mechanical Layout Costs Summary. Grazing Incidence vs. Normal Incidence. Grazing Incidence Optical System.

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Normal Laser Incidence on Cathode D. H. Dowell, SLAC LCLS Week July 19, 2005

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  1. Normal Laser Incidence on CathodeD. H. Dowell, SLACLCLS Week July 19, 2005 Grazing vs. Normal Incidence Issues Grazing Incidence Technical Risk Schemes for Normal Incidence Wakes Mechanical Layout Costs Summary

  2. Grazing Incidence vs. Normal Incidence

  3. Grazing Incidence Optical System drawing compliments of S. Gilevich

  4. Vacuum window In-vacuum mirror To cathode e-beam Wake field shielding tube Vacuum window In-vacuum mirror To cathode e-beam With or without second mirror Options for In-Vacuum Mirror • Options: • Single Mirror • Two Mirrors • Mirror w/ wake • mitigation tube

  5. Optical Path DifferenceDependence Upon Lens Position (Range of Lens 2 Position 0 – 3mm) compliments of S. Gilevich

  6. e-beam laser beam Normal Incidence Geometry figure adapted from E. Jongewaard

  7. (2) (3) (1) Wake Calculations (C. Limborg-Deprey & Cho Kuen Ng) Emittance Budget Limit

  8. Injector Gun-to-Linac Region Injector Layout Valve Valve Only two valves presently between gun and shield wall Valve New valve will be added here

  9. Layout of Laser from Injection Mirror to Cathode gun solenoid cathode laser injection cross vacuum valve drawing compliments of R.F. Boyce & T. Osier

  10. e-beam Preliminary Layout at Injection Cross drive laser beam YAG/FC cross Side View dual laser mirrors Top View e-beam wakefield plug inserted alignment laser mirror drawings compliments of R.F. Boyce & T. Osier

  11. Summary • Reviewed normal vs. grazing incidence • Grazing incidence optics add risk to laser shaping • Wakes from dual in-vacuum mirrors tolerable • Choose dual mirrors for new baseline design • Preliminary mechanical design performed for normal-incidence • Cost difference is small • Formal CCB and BCR in progress: • Design GTL for grazing incidence with dual symmetric mirrors • Add valve after L0-A • Keep option for grazing incidence

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