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Analysis of CLIC Crab Cavity with Manifold Damping and Boundary Conditions

This study investigates the performance of a single-cell CLIC crab cavity using H-H and E-H boundary conditions at a fixed phase of 120 degrees. It presents the frequency characteristics of the first eight modes within the cavity, evaluated across various GHz frequencies. The analysis focuses on manifold damping effects and coupling mechanisms in circular waveguides. Insights gained aim to enhance understanding of mode behavior in complex cavity systems, contributing to further research and simulation tasks for the CLIC project.

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Analysis of CLIC Crab Cavity with Manifold Damping and Boundary Conditions

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  1. C3CLIC Crab Cavity Vasim Khan 20.08.09

  2. WG damping From : Pravin Φ = 120 deg.

  3. H-H Boundary conditions Φ = 120 deg. 14.12 GHz 8.11 GHz 13.76 GHz 14.84 GHz 14.30 GHz

  4. E-H Boundary conditions Φ = 120 deg. 10.92 GHz 12.49 GHz 13.8217 GHz 14.25 GHz 13.8266 GHz

  5. First 8 modes in a full cell Φ = 120 deg. 8.13 GHz 12.4913 GHz 11.21 GHz 11.88 GHz 13.76 GHz 12.5007 GHz 12.4916 GHz 12.5003 GHz

  6. CLIC CRAB CAVITY SINGLE CELL WITH MANIFOLD DAMPING 2.0 1.2 All dimensions are in millimetre 5.5 13.95 11.0 5.25 2.0 5.0 6.75 11.0

  7. Blue : H-H boundary condition Blue : H-H boundary condition Red : E-H boundary condition {8.49913,8.5285,8.61154,8.71654,8.81704,8.8833,8.90759} {16.9038,17.1412,17.0696,16.9791,16.8923,16.8373,16.8189} {17.1701,17.1676,17.9376,19.1469,20.4907,20.9282,21.1052} {19.0842,19.1901,19.5028,19.9622,20.7146,22.5842,24.6713} {21.5136,21.7202,22.3295,23.3131,24.4884,24.8661,24.6752} Red : E-H boundary condition {12.7664,12.5843,12.3093,12.1112,11.9891,11.9267,11.9051} {13.369,13.6967,14.587,15.9864,17.7285,19.6465,20.9925} {14.255,14.6922,15.7054,17.0497,18.6159,20.2913,21.3548} {16.9027,17.1553,17.9208,19.1347,20.7167,21.4186,21.9121} {21.4978,21.5055,21.4857,21.4619,21.4322,22.5839,21.9455} Spline fits

  8. H-H Boundary conditionssynchronous modes 1st 8.71 GHz 2nd 16.82GHz 3rd 20.93 GHz Quadrupole 4th 21.97 GHz 5th 24.41 GHz Manifold mode Quadrupole

  9. E-H Boundary conditions synchronous modes 1st 11.99 GHz 2nd 20.17 GHz 3rd 20.55 GHz Manifold mode 4th 21.42 GHz 5th 21.85 GHz Sextupole Manifold mode

  10. First 8 modes in a full cell Φ = 120 deg. 8.81 GHz 11.99 GHz 10.1376 GHz 10.1383 GHz 15.72 GHz 14.59 GHz 12.39 GHz 14.5 GHz

  11. Cut-off frequency Rectangular waveguide Circular waveguide TMmn TEmn

  12. Next ? • Need to understand more about TE & TM coupling in a circular waveguide and cavity • Investigate the possibility of manifold damping in a CLCI cab cavity • CLIC_DDS1 on the list for more simulations • Corrections and more reading for thesis chapters

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