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A 2.3 GHz BANDWIDTH STRUCTURE FOR CLIC_DDS

A 2.3 GHz BANDWIDTH STRUCTURE FOR CLIC_DDS. Vasim Khan. 17.07.09. Spectral function. 48cells 2-fold interleaving. 24 cells No interleaving. 96 cells 4-fold interleaving. 192 cells 8-fold interleaving. ∆fmin = 65 MHz ∆tmax =15.38 ns ∆s = 4.61 m. ∆fmin = 32.5 MHz ∆tmax =30.76 ns

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A 2.3 GHz BANDWIDTH STRUCTURE FOR CLIC_DDS

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  1. A 2.3 GHz BANDWIDTH STRUCTURE FOR CLIC_DDS Vasim Khan 17.07.09

  2. Spectral function 48cells 2-fold interleaving 24 cells No interleaving 96 cells 4-fold interleaving 192 cells 8-fold 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 = 16.25 MHz ∆tmax = 61.52 ns ∆s = 18.46 m ∆fmin = 8.12 MHz ∆tmax =123 ns ∆s = 36.92 m 96 cells 4-fold interleaving 192 cells 8-fold interleaving

  4. 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.

  6. 232 47.3

  7. Updated [1] A. Grudiev, CLIC-ACE, JAN 08 [2] CLIC Note 764

  8. Considering 8 fold interleaved structure

  9. Structure # 1 Pin=76.5 MW 210 50.25

  10. Structure # 8 73.5 MW

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

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

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

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

  15. 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

  16. 24 cell structure Dashed curve : Unloaded condition Solid curve : Beam loaded condition Allowable limit on Esur Esur (MV/m) Eacc (MV/m) Avg. Eacc Pin (MW) ∆T (K) Allowable limit on ∆T

  17. 8 – fold interleaving Structure # 1 Dashed curve : Unloaded condition Solid curve : Beam loaded condition Allowable limit on Esur Esur (MV/m) Eacc (MV/m) Avg. Eacc Pin (MW) Allowable limit on ∆T ∆T (K)

  18. 8 – fold interleaving Structure # 8 Dashed curve : Unloaded condition Solid curve : Beam loaded condition Allowable limit on Esur Esur (MV/m) Eacc (MV/m) Avg. Eacc Pin (MW) Allowable limit on ∆T ∆T (K)

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