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CLIC: RF and Beam dynamics constraints in cavity designing

CLIC: RF and Beam dynamics constraints in cavity designing. Vasim. CLIC: Basic parameters. CLIC aims at operating frequency of 12 GHz and an average accelerating gradient of 100 MV/m

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CLIC: RF and Beam dynamics constraints in cavity designing

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  1. CLIC: RF and Beam dynamics constraints in cavity designing Vasim

  2. CLIC: Basic parameters • CLIC aims at operating frequency of 12 GHz and an average accelerating gradient of 100 MV/m • For X-band frequency the aperture radii of the cells are comparatively smaller and need to withstand high gradients for efficient acceleration. • This gives RF and beam dynamics constraints to designing a cavity.

  3. Constraints RF constraint 1) 2) Pulsed surface heating 3) Cost factor • Beam dynamics constraints • For a given structure, no. of particles per bunch N is decided by the <a>/λ and Δa/<a> • Maximum allowed wake • Rest of the bunches should see a wake less than this wake(i.e. No recoherence).

  4. Power and field in a tapered structure 1) 2) Solving eq.1 numerically we get power at any given point (dist.) in the structure and using eq.2 we get field at that pont.

  5. IP parameters

  6. Power and field in a CLIC_ZC structure Unloaded Beam loaded <Eacc>=100 MV/m <Eacc>=130.7 MV/m

  7. Surface fields and pulse heating Unloaded condition Beam loaded condition

  8. CLIC_ZC: Efficiency & FOM Comparison

  9. Next • I am working on next ZC structure in which surface electric field will be below the limit. • It should be noted that these calculations are based on zero crossing of wake and assuming 0.5 ns bunch spacing. • In near future I would like to explore the structure with 2 GHz bandwidth, Q~200, bunch spacing will be appro. 0.667 ns (8 cycles). • These parameters will take care of wakes without affecting the efficiency significantly but surface fields will be a real problem.

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