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Optimization and Test Results of CLIC_DDS Dipole and Manifold Modes for High-Power Applications

This report summarizes the findings on the CLIC_DDS dipole and manifold modes, focusing on the optimization for high-power RF applications. Key metrics such as frequency coupling, surface fields, and breakdown constraints are analyzed. We detail the configuration involving 24 cells, interleaving methods, and thermal aspects. Results indicate challenges with RF breakdown and systematic optimizations to enhance performance. Acknowledgments to contributors highlight collaboration benefits. Upcoming high-power testing aims to validate the design before the end of 2011.

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Optimization and Test Results of CLIC_DDS Dipole and Manifold Modes for High-Power Applications

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  1. CLIC_DDS study 30.11.2010

  2. CLIC_DDS Study Collaboration • Vasim Khan • Alessandro D’Elia • Roger Jones University of Manchester and Cockcroft institute, U.K. CERN, Switzerland • Alexej Grudiev • Germana Riddone • Vadim Soldatov • Walter Wuensch • Riccardo Zennaro

  3. Summary of CLIC_DDS_C Dipole mode Manifold mode Manifold ∆f=3.6 σ =2.3 GHz ∆f/fc=13.75% Coupling slot 24 cells No interleaving Meets design Criterion? ∆fmin = 8.12 MHz ∆tmax =123 ns ∆s = 36.92 m ∆fmin = 65 MHz ∆tmax =15.38 ns ∆s = 4.61 m 192 cells 8-fold interleaving 192 cells 8-fold interleaving

  4. Surface fields Fail to satisfy rf breakdown constraints!

  5. Circular CLIC_DDS optimisation: H-field ε=1.38 Circular cell ε=1.38 ε=0.82 Manifold-damped single cell

  6. CLIC_DDS optimisation: E-field

  7. DDS_C DDS_E Surface fields DDS_C DDS_E

  8. CLIC_DDS_A: Monopole properties Esur Max. Values Esur=220 MV/m ∆T = 51 K Pin= 70.8 Eacc_UL=131 MV/m Sc=6.75 W/μm2 RF-beam-eff=23.5% 35*Sc Eacc Pin ∆T CLIC_G Values Esur=240 MV/m ∆T = 51 deg. Pin= 63.8 Eacc_UL=128 MV/m Sc=5.4 W/μm2 RF-beam-eff=27.7% Dashed curves : Unloaded condition Solid curves: Beam loaded condition

  9. CLIC_DDS_A: Dipole properties 24 cells No interleaving Qavg ~1700

  10. CLIC_DDS_A: 24+2 cells 198.6326mm

  11. Water pipes for cooling Vacuum flange Power output Tuning holes Power input Vacuum flange Thanks to Vadim Soldatov Cut-view Beam

  12. Profile accuracy VDL

  13. Closing remarks Acknowledgments • CLIC_DDS_A is being fabricated • CLIC_DDS_A: High power test by 2011 end • We have benefited from discussions with Juwen Wang, Zhengai Li and Toshiyasu Higo on X-band structures Thank you

  14. Additional slides

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