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Structures for the CLIC Drive Beam Accelerator

Structures for the CLIC Drive Beam Accelerator. Rolf Wegner. Outline. motivation simulations of basic cells design of TWS optimisations, discussion summary and next steps. motivation. R BP = 51 mm Ø BP = 102 mm. Erk Jensen. R 6. 18. R a. R b. R 6. L a. L b. R 9. 60. gap a.

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Structures for the CLIC Drive Beam Accelerator

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  1. Structures for the CLIC Drive Beam Accelerator Rolf Wegner CLIC DBA Rolf Wegner

  2. Outline • motivation • simulations of basic cells • design of TWS • optimisations, discussion • summary and next steps CLIC DBA Rolf Wegner

  3. motivation RBP= 51 mm ØBP= 102 mm Erk Jensen CLIC DBA Rolf Wegner

  4. R 6 18 Ra Rb R 6 La Lb R 9 60 gapa gapb R 9 RBP 11 99.979 110 simulations of basic cells CLIC DBA Rolf Wegner

  5. simulations of basic cells CLIC DBA Rolf Wegner

  6. simulations of basic cells CLIC DBA Rolf Wegner

  7. simulations of basic cells tuning Ra => f0=1GHz variations: gap <=> vgr/c RBP post processing: fitting CLIC DBA Rolf Wegner

  8. gapn Ib Ib RBP Pout η= Pb/Pin tfill mode spectrum Pin design of TWS Ncells E0T Vacc CLIC DBA Rolf Wegner

  9. design of TWS example: Pin= 10 MW Ib= 4.21 A Ncells= 10 RBP= 39 mm vgr/c (gap) const η= 97.7% tfilling= 239.9 ns vgr/c lin. distribution η= 98.0% tfilling= 252.7 ns CLIC DBA Rolf Wegner

  10. design of TWS example: Pin= 10 MW Ib= 4.21 A Ncells= 10 RBP= 39 mm vgr/c const η= 97.7% tfilling= 239.9 ns vgr/c lin. distribution η= 98.0% tfilling= 252.7 ns CLIC DBA Rolf Wegner

  11. design of TWS example: Pin= 10 MW Ib= 4.21 A Ncells= 10 RBP= 39 mm vgr/c const η= 97.7% tfilling= 239.9 ns vgr/c lin. distribution η= 98.0% tfilling= 252.7 ns CLIC DBA Rolf Wegner

  12. design of TWS example: Pin= 10 MW Ib= 4.21 A Ncells= 10 RBP= 39 mm vgr/c const η= 97.7% tfilling= 239.9 ns vgr/c lin. distribution η= 98.0% tfilling= 252.7 ns CLIC DBA Rolf Wegner

  13. gap1 gapn (vgr/c)1 (vgr/c)n optimisations CLIC DBA Rolf Wegner

  14. optimisations Pin= 10 MW Ib= 4.21 A RBP= 39 mm Ncells= 10 vgr/c lin. distribution vgr/c= [2.2% to 0.86%] vgr/c= [1.7% to 0.86%] vgr/c= [1.7% to 1.28%] CLIC DBA Rolf Wegner

  15. optimisations Pin= 10 MW Ib= 4.21 A RBP= 39 mm Ncells= 4 .. 16 vgr/c lin. distribution optimised for efficiency CLIC DBA Rolf Wegner

  16. optimisations - efficiency Pin= 10 MW Ib= 4.21 A RBP= 29 .. 45 mm Ncells= 4 .. 16 vgr/c lin. distribution optimised for efficiency • RF to beam efficiency • 97-98% • no damping • variety of structures • Ncells ~ 6 .. 15 • Lstructure ~ 0.6 .. 1.5 m • RBP ~ 29 .. 45 mm CLIC DBA Rolf Wegner

  17. optimisations - efficiency Pin= 15 MW Ib= 4.21 A RBP= 35 .. 47 mm Ncells= 12 .. 25 vgr/c lin. distribution optimised for efficiency • RF to beam efficiency • 97-98% • no damping • variety of structures • Ncells ~ 11 .. 25 • Lstructure ~ 1.1 .. 2.5 m • RBP ~ 35 .. 51 mm CLIC DBA Rolf Wegner

  18. optimisations – filling time Pin= 10 MW Ib= 4.21 A RBP= 39 mm Ncells= 4 .. 16 vgr/c const filling time <=> efficiency CLIC DBA Rolf Wegner

  19. 124 ns D ≈ 1/4 damping factor D 368 ns D ≈ 1/4 245 ± 27 ns D ≈ 1/10 tfill [ns] 245 ns D ≈ 1/18 combined optimisations • structure tasks: • acceleration => ηRF • phase noise damping=> D, tfill combination for optimisation C(ηRF,tfill)= f1(ηRF) + f2(tfill) f1(x)= 1- x f2(x)= α ((tfill-t0)/Δt)2 t0= 245 nsΔt= 27 nsα= 2% ? CLIC DBA Rolf Wegner

  20. combined optimisations CLIC DBA Rolf Wegner

  21. combined optimisations CLIC DBA Rolf Wegner

  22. combined optimisations CLIC DBA Rolf Wegner

  23. combined optimisations CLIC DBA Rolf Wegner

  24. combined optimisations CLIC DBA Rolf Wegner

  25. combined optimisations CLIC DBA Rolf Wegner

  26. summary • variation of RBP => set of structures withηRF= 97 .. 98% (undamped)tfill = 245 ± 10 ns CLIC DBA Rolf Wegner

  27. next steps CLIC DBA Rolf Wegner

  28. next steps • mode bands • wake fields • damping CLIC DBA Rolf Wegner

  29. Erk for all explanations and support thank you • for your attention CLIC DBA Rolf Wegner

  30. CLIC DBA Rolf Wegner

  31. additional slides CLIC DBA Rolf Wegner

  32. additional slides CLIC DBA Rolf Wegner

  33. additional slides CLIC DBA Rolf Wegner

  34. additional slides CLIC DBA Rolf Wegner

  35. additional slides CLIC DBA Rolf Wegner

  36. additional slides CLIC DBA Rolf Wegner

  37. additional slides CLIC DBA Rolf Wegner

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