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Wakefield suppression in the CLIC main accelerating structures

This study explores innovative methods for suppressing wakefield effects in the CLIC main linacs, focusing on alternative schemes. Key techniques include detuning the first dipole band to create Gaussian frequency spreads among cell parameters and analyzing moderate damping conditions with Q~500. We conduct computations on coupled mode frequencies and wakefield interactions, emphasizing adjustments to cell parameters to minimize wakefield oscillations. The effectiveness of these strategies is evaluated using modified CLIC_G structure and CLIC_ZC structure cell configurations, providing insights into optimizing accelerator performance.

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Wakefield suppression in the CLIC main accelerating structures

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  1. Wakefield suppression in the CLIC main accelerating structures Vasim Khan & Roger Jones

  2. Wakefield suppression in CLIC main linacs • We are looking into alternative scheme in order to suppress the wakefield in the main accelerating structures: • 1) Detuning the first dipole band by forcing the cell parameters to have Gaussian spread in the frequencies • 2) Considering the moderate damping Q~500

  3. CLIC_G structure Cell parameters of a modified CLIC_G structure: Gaussian distribution Uncoupled values: <a>/λ=0.11 ∆f = 0.82 GHz ∆f = 3σ i.e.(σ=0.27 GHz) ∆f/favg= 4.5 % Then we calculate the coupled mode frequencies and kicks using double band circuit model

  4. Modified CLIC_G structure Coupled Uncoupled Coupled Uncoupled Undamped Undamped Q = 500 Q = 500 Envelope Wake-field Amplitude Wake-field

  5. Zero crossing of wake-field The oscillations in the wake-field amplitude are due to a corresponding sin term. We adjust the mode frequencies to force the bunches to be located at the zero crossing in the wake-field. We adjust the zero crossing by systematically shifting the cell parameters (aperture and cavity radius). Cell parameters of seven cells of CLIC_ZC structure having Gaussian distribution Uncoupled values: <a>/λ=0.102 ∆f = 0.83 GHz ∆f = 3σ i.e.(σ=0.27 GHz) ∆f/favg= 4.56% ∆a1=160µm and ∆a24= 220µm. The first trailing bunch is at 73% of the peak value (Wmax=180 V/pC/mm/m). ∆f=110 MHz. There is a considerable difference in the actual wake-field experienced by the bunch, which is 1.7 % of peak value which was otherwise 27%.

  6. CLIC_ZC structure Coupled Uncoupled Coupled Uncoupled Undamped Undamped Q = 500 Q = 500 Envelope Wake-field Amplitude Wake-field

  7. Interleaved cells & SRMS Q = 500 Q = 500 192 cells 24 cells

  8. Thank you

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