1. A 2.3 GHz BANDWIDTH STRUCTURE FOR CLIC_DDS
Vasim Khan

2. Spectral function 48cells 24 cells 2-fold interleaving No interleaving

3. ∆fmin = 65 MHz
∆tmax =15.38 ns
∆s = 4.61 m
∆fmin = 32.5 MHz
∆tmax =30.76 ns
∆s = 9.22 m
48cells
2-fold interleaving
24 cells
No interleaving
∆fmin = MHz
∆tmax = ns
∆s = m
∆fmin = 8.12 MHz
∆tmax =123 ns
∆s = m
96 cells
4-fold interleaving
192 cells
8-fold interleaving

4. Results based on only 3 cell simulations.
Unloaded
Unloaded
Allowed limit = 260 MV/m
Allowed limit = 56 K
Corrected formula for effective pulse length [1]
Results based on only 3 cell simulations.
[1] A. Grudiev, CLIC-ACE, JAN 08

5. 7 cell simulations.

8. 232
47.3

9. (for corrected pulse length: Eff.=26.6%)
Updated
Parameters
CLIC_G (Optimised) [1,2]
CLIC_DDS
(Non-optimised)
Bunch space (rf cycles/ns)
6/0.5
8/0.67
Limit on wake (V/pC/mm/m)
7.1
5.6
Number of bunches
312
Bunch population (109)
3.72
4.5
Pulse length (ns)
240.8
273
Fill time (ns)
62.9
41.68
Pin (MW)
63.8 72
Esur max. (MV/m)
245
232
Pulse temperature rise (K) 53
47.3
RF-beam-eff.
27.7
24.1
(for corrected pulse length: Eff.=26.6%)
[1] A. Grudiev, CLIC-ACE, JAN 08
[2] CLIC Note 764

10. Considering 8 fold interleaved structure
Parameters
Structure # 1
Structure # 8
f1, f24 (GHz) , ,
∆f (GHz)
2.0756
2.1824
a1, a24 (mm) 4,
3.8968, 2.3
N (x109 particels/bunch)
5.41
4.6275

11. Structure # 1
Pin=76.5 MW
210
50.25

12. Structure # 8
73.5 MW

13. Sum RMS wake-field of an 8-fold interleaved structure
Amplitude wake
Sumwake wake

14. Random error in frequencies +/- 3.5 MHz
Random error in f (MHz)
Cell #
f (GHz)
Cell #

15. Random error in frequencies +/- 3.5 MHz
8 fold interleaved structure

16. Random error in frequencies +/- 3.5 MHz
Amplitude wake
Sumwake wake

17. Dipole simulations with fillet and high mesh
Cell # 1
No fillet, solution is not converged (only 3 passes )and average mesh = 50 k
Geometry with fillet, solution is converged and average mesh = 400 k
Cell # 13
No fillet, solution is not converged (only 3 passes )and average mesh = 50 k
Geometry with fillet, solution is converged and average mesh = 400 k
No fillet, solution is not converged (only 3 passes )and average mesh = 40 k
Cell # 24
Geometry with fillet, solution is converged and average mesh = 400 k