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CLIC DBA Rolf Wegner 1 Structures for the CLIC Drive Beam Accelerator Rolf Wegner

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CLIC DBA Rolf Wegner 2 motivation simulations of basic cells design of TWS optimisations, discussion summary and next steps Outline

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CLIC DBA Rolf Wegner 3 motivation Erk Jensen R BP = 51 mm Ø BP = 102 mm

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CLIC DBA Rolf Wegner 4 R 6 R 9 18 gap a LaLa simulations of basic cells R BP RaRa RbRb gap b LbLb

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CLIC DBA Rolf Wegner 5 simulations of basic cells

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CLIC DBA Rolf Wegner 6 simulations of basic cells

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CLIC DBA Rolf Wegner 7 simulations of basic cells tuning R a => f 0 =1GHz variations: gap vgr/c R BP post processing: fitting

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CLIC DBA Rolf Wegner 8 design of TWS gap n R BP P out η= P b /P in t fill mode spectrum E 0 T V acc Ncells P in IbIb IbIb

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CLIC DBA Rolf Wegner 9 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c (gap) const η= 97.7% tfilling= ns v gr /c lin. distribution η= 98.0% t filling = ns

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CLIC DBA Rolf Wegner 10 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c const η= 97.7% tfilling= ns v gr /c lin. distribution η= 98.0% t filling = ns

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CLIC DBA Rolf Wegner 11 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c const η= 97.7% tfilling= ns v gr /c lin. distribution η= 98.0% t filling = ns

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CLIC DBA Rolf Wegner 12 design of TWS example: P in = 10 MW I b = 4.21 A N cells = 10 R BP = 39 mm vgr/c const η= 97.7% tfilling= ns v gr /c lin. distribution η= 98.0% t filling = ns

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CLIC DBA Rolf Wegner 13 optimisations gap n (vgr/c) n gap 1 (vgr/c) 1

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CLIC DBA Rolf Wegner 14 optimisations P in = 10 MW I b = 4.21 A R BP = 39 mm Ncells= 10 vgr/c lin. distribution vgr/c= [2.2% to 0.86%] vgr/c= [1.7% to 0.86%] vgr/c= [1.7% to 1.28%]

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CLIC DBA Rolf Wegner 15 optimisations P in = 10 MW I b = 4.21 A R BP = 39 mm Ncells= vgr/c lin. distribution optimised for efficiency

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CLIC DBA Rolf Wegner 16 optimisations - efficiency P in = 10 MW I b = 4.21 A R BP = mm Ncells= vgr/c lin. distribution optimised for efficiency RF to beam efficiency 97-98% no damping variety of structures Ncells ~ L structure ~ m R BP ~ mm

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CLIC DBA Rolf Wegner 17 optimisations - efficiency P in = 15 MW I b = 4.21 A R BP = mm Ncells= vgr/c lin. distribution optimised for efficiency RF to beam efficiency 97-98% no damping variety of structures Ncells ~ L structure ~ m R BP ~ mm

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CLIC DBA Rolf Wegner 18 optimisations – filling time P in = 10 MW I b = 4.21 A R BP = 39 mm Ncells= vgr/c const filling time efficiency

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CLIC DBA Rolf Wegner 19 t 0 = 245 ns Δt= 27 ns α= 2% ? combined optimisations t fill [ns] damping factor D 245 ns D ≈ 1/ ns D ≈ 1/4 124 ns D ≈ 1/4 combination for optimisation C(η RF,t fill )= f 1 (η RF ) + f 2 (t fill ) 245 ± 27 ns D ≈ 1/10 structure tasks: acceleration => η RF phase noise damping => D, t fill f 1 (x)= 1- x f 2 (x)= α ((t fill -t 0 )/Δt) 2

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CLIC DBA Rolf Wegner 20 combined optimisations

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CLIC DBA Rolf Wegner 21 combined optimisations

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CLIC DBA Rolf Wegner 22 combined optimisations

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CLIC DBA Rolf Wegner 23 combined optimisations

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CLIC DBA Rolf Wegner 24 combined optimisations

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CLIC DBA Rolf Wegner 25 combined optimisations

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CLIC DBA Rolf Wegner 26 summary variation of R BP => set of structures with η RF = % (undamped) t fill = 245 ± 10 ns P in = 10 MWP in = 15 MW N cells ≥ 9 opt: 11,12N cells ≥ 14 opt: L strucutre ≥ 0.9 m 1.2 mL strucutre ≥ 1.4 m 2 m total length ≥ 930 m 1.2 kmtotal length ≥ 960 mm 1.4 km R BP ≥ 33 mm mmR BP ≥ 37 mm mm

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CLIC DBA Rolf Wegner 27 next steps

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CLIC DBA Rolf Wegner 28 next steps mode bands wake fields damping

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CLIC DBA Rolf Wegner 29 thank you for your attention Erk for all explanations and support

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CLIC DBA Rolf Wegner 30

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CLIC DBA Rolf Wegner 31 additional slides

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CLIC DBA Rolf Wegner 32 additional slides

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CLIC DBA Rolf Wegner 33 additional slides

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CLIC DBA Rolf Wegner 34 additional slides

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CLIC DBA Rolf Wegner 35 additional slides

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CLIC DBA Rolf Wegner 36 additional slides

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CLIC DBA Rolf Wegner 37 additional slides

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