1. CLIC MAIN LINAC DDS Vasim Khan

2. 24 cells No interleaving 48cells 2-fold interleaving ∆fmin = 32.5 MHz ∆tmax =30.76 ns ∆s = 9.22 m 24 cells No interleaving ∆fmin = 65 MHz ∆tmax =15.38 ns ∆s = 4.61 m 48cells 2-fold interleaving Summary of results

3. 96 cells 4-fold interleaving 192 cells 8-fold interleaving V. Khan LC-ABD 09, Cockcroft Institute 22.09.09 8/13 96 cells 4-fold interleaving ∆fmin = 16.25 MHz ∆tmax = 61.52 ns ∆s = 18.46 m 192 cells 8-fold interleaving ∆fmin = 8.12 MHz ∆tmax =123 ns ∆s = 36.92 m Summary of results

4. For CLIC_G structure /λ=0.11, considering the beam dynamics constraint bunch population is 3.72 x 10^9 particles per bunch and the heavy damping can allow an inter bunch spacing as compact as ~0.5 ns. This leads to about 1 A beam current and rf –to- beam efficiency of ~28%. For CLIC_DDS structure (2.3 GHz) /λ=0.126, and has an advantage of populating bunches up to 4.5x10^9 particles but a moderate Q~500 will require an inter bunch spacing of 8 cycles (~ 0.67 ns). Though the bunch spacing is increased in CLIC_DDS, the beam current is compensated by increasing the bunch population and hence the rf-to-beam efficiency of the structure is not affected alarmingly. CLIC_G vs CLIC_DDS

5. ParametersCLIC_G (Optimised) [1,2] CLIC_DDS (Single structure) CLIC_DDS (8-fold interleaved) Bunch space (rf cycles/ns)6/0.58/0.67 Limit on wake (V/pC/mm/m)7.15.65.3* Number of bunches312 Bunch population (10 9 )3.724.75.0* Pulse length (ns)240.8273272.2* Fill time (ns)62.94240.8* Pin (MW)63.87275.8* Esur max. (MV/m)245232236 Pulse temperature rise (K)5347.351 RF-beam-eff.27.726.626.7* Figure of merit (a.u.)9.18.418.29* [1] A. Grudiev, CLIC-ACE, JAN 08 [2] H. Braun, CLIC Note 764, 2008 * Mean value of 8 structures CLIC_G vs CLIC_DDS

6. Single structure vs. Interleaved structure Interleaved structures Single structure Interleaved structures Single structure Mean of interleaved structures Mean of interleaved structures

7. Sumwake: 8-fold interleaved structure Mean deviationRMS sumwake

8. Random error RMS ∆f = 3.5 MHz

9. Random error RMS ∆f = 2.4 MHz

10. Eight fold Interleaving 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 9 17 185 Single structure 2 10 18 1863 11 19 1874 12 20 1885 13 21 1896 14 22 1907 15 23 1918 16 24 192

11. Decoupling end cell from each structure

12. Decoupling 2 end cells from each structure

13. Decoupling both the end cells from each structure

14. Decoupling two end cells from either side from each structure

15. Decoupling first cell and two end cells from each structure + RMS 2.5 MHz Random error

16. Decoupling first cell and last cell from each structure + RMS 2.5 MHz Random error

17. A typical geometry : cell # 1 R h r1 h1 L a1 t/2 a b RcRc a a+a1 R

18. Structure Geometry Cell parameters a1 t/2 a L b Rc a a+a1 R Iris radius Cavity radius Sparse Sampled HPT (High Power Test) Fully Interleaved 8-structures a min, a max = 4.0, 2.13 b min, b max = 10.5, 9.53

19. Structure Geometry Cell parameters a1 t/2 a L b Rc a a+a1 R Iris thickness Ellipticity Sparse Sampled HPT (High Power Test) Fully Interleaved 8-structures t min, t max = 4.0, 0.35 ε min, ε max = 1.0, 2.0

20. Structure Geometry Manifold parameters a1 t/2 a L b Rc a a+a1 R Degree of manifold penetration Manifold radius Sparse Sampled HPT (High Power Test) Fully Interleaved 8-structures Degree of manifold penetration Manifold radius Rc min, Rc max = 6.2, 7.5 R min, R max = 3.25, 2.3

21. Structure # 1 in an 8-fold interleaved design Structure # 8 in an 8-fold interleaved design

22. Structure # 1 in an 8-fold interleaved design Structure # 8 in an 8-fold interleaved design

23. Structure # 1 in an 8-fold interleaved design Structure # 8 in an 8-fold interleaved design

24. Sparse Sampled Structure Structure # 1 in an 8-fold interleaved design Structure # 8 in an 8-fold interleaved design

25. Sparse Sampled HPT (High Power Test) Fully Interleaved 8-structures dn/df Kdn/df dn/df Kdn/df dn/df Kdn/df dn/df Kdn/df

26. Sparse Sampled HPT (High Power Test)

27. Fully Interleaved 8-structures

28. Structure # 1 in an 8-fold interleaved design

29. Structure # 8 in an 8-fold interleaved design

30. SRMS: Random errors with 20 iterations ∆f = +/- 4.0 MHz RMS ∆f ~ 2.3 MHz