1. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 1/13 CLIC_DDS study 30.11.2010

2. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 2/13 CLIC_DDS Study Collaboration Vasim Khan Alessandro D’Elia Roger Jones Alexej Grudiev Germana Riddone Vadim Soldatov Walter Wuensch Riccardo Zennaro University of Manchester and Cockcroft institute, U.K. CERN, Switzerland

3. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 3/13 192 cells 8-fold interleaving 24 cells No interleaving 192 cells 8-fold interleaving Manifold Coupling slot Dipole mode Manifold mode ∆fmin = 65 MHz ∆tmax =15.38 ns ∆s = 4.61 m ∆fmin = 8.12 MHz ∆tmax =123 ns ∆s = 36.92 m ∆f=3.6 σ =2.3 GHz ∆f/fc=13.75% Summary of CLIC_DDS_C Meets design Criterion?

4. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 4/13 Surface fields Fail to satisfy rf breakdown constraints!

5. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 5/13 CLIC_DDS optimisation: H-field Circular Circular cell ε =0.82 ε=1.38 Manifold-damped single cell ε=1.38

6. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 6/13 CLIC_DDS optimisation: E-field

7. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 7/13 Surface fields DDS_E DDS_C DDS_E DDS_C

8. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 8/13 CLIC_DDS_A: Monopole properties Max. Values Esur=220 MV/m ∆T = 51 K Pin= 70.8 Eacc_UL=131 MV/m Sc=6.75 W/μm 2 RF-beam-eff=23.5% ∆T 35*Sc Esur Eacc Pin Dashed curves : Unloaded condition Solid curves: Beam loaded condition CLIC_G Values Esur=240 MV/m ∆T = 51 deg. Pin= 63.8 Eacc_UL=128 MV/m Sc=5.4 W/μm 2 RF-beam-eff=27.7%

9. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 9/13 CLIC_DDS_A: Dipole properties 24 cells No interleaving Q avg ~1700

10. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 10/13 CLIC_DDS_A: 24+2 cells 198.6326mm

11. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 11/13 Water pipes for cooling Vacuum flange Power input Power output Tuning holes Cut-view Bea m Thanks to Vadim Soldatov

12. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 12/13 Profile accuracy VDL

13. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 13/13 Acknowledgments We have benefited from discussions with Juwen Wang, Zhengai Li and Toshiyasu Higo on X-band structures Thank you Closing remarks CLIC_DDS_A is being fabricated CLIC_DDS_A: High power test by 2011 end

14. Vasim Khan X-Band RF Structures, Beam Dynamics and Sources Workshop, Cockcroft Institute 30.11.10 14/13 Additional slides