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5.7 GHz high gradient test cavity

Rossana Bonomi , Alberto Degiovanni, Marco Garlasché , Silvia Verdú Andrés. 5.7 GHz high gradient test cavity. Outline. High gradient test goals and program RF design Structural design Tolerances and tuning Open issues. TERA high gradient program. 3. Design overview.

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5.7 GHz high gradient test cavity

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  1. Rossana Bonomi, Alberto Degiovanni, Marco Garlasché, Silvia Verdú Andrés 5.7 GHz high gradient test cavity

  2. Outline • High gradient test goals and program • RF design • Structural design • Tolerances and tuning • Open issues TERA Foundation

  3. TERA high gradient program 3 TERA Foundation

  4. Design overview Accelerating cell @ 5.7 GHz (two unsymmetrical half cells) RF H-coupling system (waveguide, short circuit) Cooling system (3 plates, in-out pipes) Connection to data acquisition (through CF flanges) TERA Foundation

  5. power source TERA Foundation

  6. RF Design TERA Foundation

  7. 2.0 18.8 15.8 17.39 1.0 1.0 25° 7.47 1.0 1.5 Cavities comparison All values in mm ! TERA Foundation

  8. separate Emax and Sc,max InnerNose Radius OuterNose Radius Flat Nose TERA Foundation

  9. separate Emax and Sc,max Power and Surface Electric Field scaling: E0,norm=33 MV/m TERA Foundation

  10. 3.0 18.8 15.8 17.34 1.0 3.0 20° 8.0 1.0 1.5 Cavities comparison All values in mm ! TERA Foundation

  11. Parameterlistfor test TERA Foundation

  12. mesh • Max. elementlength for: • Cell………………... 3 mm • Coupler …………. 2 mm • WG ……………….. 10 mm • Max. surf. deviation for: • Cell……………… 0.01 mm • Coupler ……… 0.01 mm TERA Foundation

  13. cavity parameters TERA Foundation

  14. slot dimensions Short-circuit TERA Foundation

  15. field asymmetry N W E S TERA Foundation

  16. Structural Design TERA Foundation

  17. Struct. design: halfcells Two unsymmetrical halfcells: - easier brazing - no spikes in slot Outerdimensions: 48.9 x 45.9mm C_factor = 1.5 Tuning range ≈ 20 MHz TERA Foundation

  18. Struct. design: halfcell #1- tuning • Small cell diameter and brazing position do not allow controlled dimple tuning • Presence of tuners in standard linacs for med. treatment Tuning done through 3 tuners diametrically inserted in cavity. Øtuners ~ 2 - 3 - 4 mm TERA Foundation

  19. Struct. design: halfcells’ brazing Enlarged flanges (CF 34/16) for structural resistance during brazing (Øext= 39mm) TERA Foundation

  20. Struct. design: waveguide+flanges Brazing: Waveguide: - WR 187 thickwalled (ID : 1.872 x 0.872 in – OD: 2.122 x 1.122 in) - C10100 copper Flanges: - FDP48-FDM48 standard* - 316LN stainless steel TERA Foundation

  21. Struct. design: cooling plate Pulsed Surface Heating TERA Foundation

  22. Struct. design: cooling plate C10100 Copper Tuners  covering plate 316L stainless steel with Ni+Cu coating TERA Foundation

  23. Tolerances and Tuning TERA Foundation

  24. tolerances r 1 2 3 4 5 6 9 7 8 z TERA Foundation

  25. tuning sensitivity TERA Foundation

  26. field asymmetries 3 tuners: Ø = 3-3-4 mm penetration = 3 mm Δf = + 22 MHz TERA Foundation

  27. Open Issues • Prototype components: • any info on FDP-FDM standard • Test components: • advice on instrumentation needed, dimensions, weight, C to S band transition… • Faraday cup • Optical spectrumanalyzer • Thermal sensors, flowmeter, manometer.. • RF pick-up • Further tests: • Two more prototypes brazed @ 1040˚ under Nitrogen, need support on: • geometry definition (holes, thicknesses, stresses & deformations) • production process definition (tolerances..) • brazingprocessdefinition(process sponsoring, brazing material, logistics..) TERA Foundation

  28. acknowledgments Thank you for all advice, discussions and help for our project Thank you for scheduling our meeting today to be continued…. 28 TERA Foundation

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