1. 12.08.2009CLIC DBA Rolf Wegner 1 Structures for the CLIC Drive Beam Accelerator Rolf Wegner

2. 12.08.2009CLIC DBA Rolf Wegner 2 motivation simulations of basic cells design of TWS optimisations, discussion summary and next steps Outline

3. 12.08.2009CLIC DBA Rolf Wegner 3 motivation Erk Jensen R BP = 51 mm Ø BP = 102 mm

4. 12.08.2009CLIC DBA Rolf Wegner 4 R 6 R 9 18 gap a LaLa simulations of basic cells R BP RaRa RbRb gap b LbLb 110 60 11 99.979

5. 12.08.2009CLIC DBA Rolf Wegner 5 simulations of basic cells

6. 12.08.2009CLIC DBA Rolf Wegner 6 simulations of basic cells

7. 12.08.2009CLIC DBA Rolf Wegner 7 simulations of basic cells tuning R a => f 0 =1GHz variations: gap vgr/c R BP post processing: fitting

8. 12.08.2009CLIC DBA Rolf Wegner 8 design of TWS gap n R BP P out η= P b /P in t fill mode spectrum E 0 T V acc Ncells P in IbIb IbIb

9. 12.08.2009CLIC DBA Rolf Wegner 9 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c (gap) const η= 97.7% tfilling= 239.9 ns v gr /c lin. distribution η= 98.0% t filling = 252.7 ns

10. 12.08.2009CLIC DBA Rolf Wegner 10 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c const η= 97.7% tfilling= 239.9 ns v gr /c lin. distribution η= 98.0% t filling = 252.7 ns

11. 12.08.2009CLIC DBA Rolf Wegner 11 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c const η= 97.7% tfilling= 239.9 ns v gr /c lin. distribution η= 98.0% t filling = 252.7 ns

12. 12.08.2009CLIC DBA Rolf Wegner 12 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c const η= 97.7% tfilling= 239.9 ns v gr /c lin. distribution η= 98.0% t filling = 252.7 ns

13. 12.08.2009CLIC DBA Rolf Wegner 13 optimisations gap n (vgr/c) n gap 1 (vgr/c) 1

14. 12.08.2009CLIC DBA Rolf Wegner 14 optimisations P in = 10 MW I b = 4.21 A R BP = 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%]

15. 12.08.2009CLIC DBA Rolf Wegner 15 optimisations P in = 10 MW I b = 4.21 A R BP = 39 mm Ncells= 4.. 16 vgr/c lin. distribution optimised for efficiency

16. 12.08.2009CLIC DBA Rolf Wegner 16 optimisations - efficiency P in = 10 MW I b = 4.21 A R BP = 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 L structure ~ 0.6.. 1.5 m R BP ~ 29.. 45 mm

17. 12.08.2009CLIC DBA Rolf Wegner 17 optimisations - efficiency P in = 15 MW I b = 4.21 A R BP = 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 L structure ~ 1.1.. 2.5 m R BP ~ 35.. 51 mm

18. 12.08.2009CLIC DBA Rolf Wegner 18 optimisations – filling time P in = 10 MW I b = 4.21 A R BP = 39 mm Ncells= 4.. 16 vgr/c const filling time efficiency

19. 12.08.2009CLIC DBA Rolf Wegner 19 t 0 = 245 ns Δt= 27 ns α= 2% ? combined optimisations t fill [ns] damping factor D 245 ns D ≈ 1/18 368 ns D ≈ 1/4 124 ns D ≈ 1/4 combination for optimisation C(η RF,t fill )= f 1 (η RF ) + f 2 (t fill ) 245 ± 27 ns D ≈ 1/10 structure tasks: acceleration => η RF phase noise damping => D, t fill f 1 (x)= 1- x f 2 (x)= α ((t fill -t 0 )/Δt) 2

20. 12.08.2009CLIC DBA Rolf Wegner 20 combined optimisations

21. 12.08.2009CLIC DBA Rolf Wegner 21 combined optimisations

22. 12.08.2009CLIC DBA Rolf Wegner 22 combined optimisations

23. 12.08.2009CLIC DBA Rolf Wegner 23 combined optimisations

24. 12.08.2009CLIC DBA Rolf Wegner 24 combined optimisations

25. 12.08.2009CLIC DBA Rolf Wegner 25 combined optimisations

26. 12.08.2009CLIC DBA Rolf Wegner 26 summary variation of R BP => set of structures with η RF = 97.. 98% (undamped) t fill = 245 ± 10 ns P in = 10 MWP in = 15 MW N cells ≥ 9 opt: 11,12N cells ≥ 14 opt: 18..20 L strucutre ≥ 0.9 m 1.2 mL strucutre ≥ 1.4 m 2 m total length ≥ 930 m 1.2 kmtotal length ≥ 960 mm 1.4 km R BP ≥ 33 mm 40..45 mmR BP ≥ 37 mm 45..50 mm

27. 12.08.2009CLIC DBA Rolf Wegner 27 next steps

28. 12.08.2009CLIC DBA Rolf Wegner 28 next steps mode bands wake fields damping

29. 12.08.2009CLIC DBA Rolf Wegner 29 thank you for your attention Erk for all explanations and support

30. 12.08.2009CLIC DBA Rolf Wegner 30

31. 12.08.2009CLIC DBA Rolf Wegner 31 additional slides

32. 12.08.2009CLIC DBA Rolf Wegner 32 additional slides

33. 12.08.2009CLIC DBA Rolf Wegner 33 additional slides

34. 12.08.2009CLIC DBA Rolf Wegner 34 additional slides

35. 12.08.2009CLIC DBA Rolf Wegner 35 additional slides

36. 12.08.2009CLIC DBA Rolf Wegner 36 additional slides

37. 12.08.2009CLIC DBA Rolf Wegner 37 additional slides