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

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Presentation transcript:

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

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 12/11/20082

StructureCLIC_G Frequency (GHz)12 Avg. Iris radius/wavelength /λ0.11 Input / Output iris radii (mm)3.15, 2.35 Input / Output iris thickness (mm)1.67, 1.0 Group velocity (% c)1.66, 0.83 No. of cells per cavity24 Bunch separation (rf cycles)6 No. Of bunches in a train312 Cella (mm)b (mm)t (mm)Vg/c (%)f1 (GHz) 1st Ref Ref Ref th Cell parameters of a modified CLIC_G structure: Gaussian distribution Uncoupled values: /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 CLIC_G structure 312/11/2008

Modified CLIC_G structure Uncoupled Coupled Q = 500 Undamped 4 Envelope Wake-field Amplitude Wake-field 12/11/2008

Cell #a (mm)b (mm)t (mm)Vg/c (%)f1 (GHz) Cell parameters of seven cells of CLIC_ZC structure having Gaussian distribution Uncoupled values: /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 (W max =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%. 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 wakefield. We adjust the zero crossing by systematically shifting the cell parameters (aperture and cavity radius). 512/11/2008

CLIC_ZC structure Coupled Uncoupled Undamped Q = Envelope Wake-field Amplitude Wake-field 12/11/2008

Interleaved cells & S RMS Q = cells 192 cells 712/11/2008

Thank you 12/11/20088