CLIC-ACE, 20 June 2007 Alexej Grudiev, CLIC main linac structure optimization. CLIC main linac accelerating structure CLIC_G Alexej Grudiev

CLIC-ACE, 20 June 2007 Alexej Grudiev, CLIC main linac structure optimization. Parameters of new structure StructureCLIC_G Frequency: f [GHz]12 Average iris radius/wavelength: /λ0.11 Input/Output iris radii: a 1, 2 [mm]3.15, 2.35 Input/Output iris thickness: d 1, 2 [mm]1.67, 1.00 N. of reg. cells, str. length: N c, l [mm]24, 229 Bunch separation: N s [rf cycles]6 Luminosity per bunch X-ing: L b× [m -2 ]1.22×10 34 Bunch population: N3.72×10 9

CLIC-ACE, 20 June 2007 Alexej Grudiev, CLIC main linac structure optimization. Parameters of new structure StructureCLIC_G interpolatedCLIC_G calculated Group velocity: v g /c [%]1.70, 1.23, , 1.19, 0.83 Q Cu 6173, 6274, , 6177, 6265 R/Q [Linac kOhm/m]14.7, 16.3, , 16.2, 17.9 E surf max /E acc 2.0, 2.0, , 1.9, 1.9 H surf max /E acc [mA/V]-4.2, 4.0, 3.8 [K]64.9, 57.6, , 58.3, 52.6 Number of bunches in a train: N b 267 Filling time, rise time: τ f, τ r [ns]62.9, 22.4 Pulse length: τ p [ns] (243.3) Input power: P in [MW] P in /Ct P p 1/3 [MW/mm ns 1/3 ] (18) Max. surface field: E surf max [MV/m] Max. temperature rise: ΔT max [K]3636 (38.9) [51] Efficiency: η [%] (27.8) Figure of merit: ηL b× /N [a.u.] (9.1) Very good agreement between interpolated and calculated parameters

CLIC-ACE, 20 June 2007 Alexej Grudiev, CLIC main linac structure optimization. CLIC_G structure (no interpolation)

CLIC-ACE, 20 June 2007 Alexej Grudiev, CLIC main linac structure optimization. Parameters of CLIC main linac StructureCLIC_G interpolatedCLIC_G calculated Luminosity : L 1 [ cm -2 s -1 ] 2.0 Repetition frequency: f rep [Hz] RF input power: P l [MW/linac] RF energy per pulse: P l /f rep [kJ/linac] Electricity cost for 10 years: C e [a.u.] Investment cost: C i [a.u.]

CLIC-ACE, 20 June 2007 Alexej Grudiev, CLIC main linac structure optimization. Parameters of dipole modes Parameters of dipole modes StructureCLIC_G interpolatedCLIC_G calculated Q1Q1 11.5, 8.9, 7.4… A 1 [V/pC/mm/m]151, 171, 185… f 1 [GHz]16.69, 17.15, 17.59…

CLIC-ACE, 20 June 2007 Alexej Grudiev, CLIC main linac structure optimization. Mistake in temperature rise calculation ~ +30%