Crab crossing plan Optimize the crabbing system for best beam stability and minimum emittance impact Study and specify tolerances on cavity multipole components.

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Presentation transcript:

Crab crossing plan Optimize the crabbing system for best beam stability and minimum emittance impact Study and specify tolerances on cavity multipole components by estimating impact on the ring’s dynamic aperture Study effects of and specify tolerances on crab cavity errors such as misalignment, amplitude and phase instability Specify high-order mode requirements Specify requirement on the beam parameters such as maximum bunch length Evaluate and optimize impedance of the crab cavities Complete beam dynamics simulation using an optimized field map satisfying the determined requirements

Emittance growth with crabbing ~13% emittance increase Emittance level can be recovered after ramping CC down

Impact of b3 on Dynamic Aperture Dynamic Aperture: Maximum stable amplitude of motion V/m^3 mT/m (mT/m)/1MV 0.00E+00 2.00E+10 3347.533 160.8694088 4.00E+10 6695.066 321.7388175 6.00E+10 10042.6 482.6082263 8.00E+10 13390.13 643.4776351 1.00E+11 16737.67 804.3470438 1.20E+11 20085.2 965.2164526

Single-cell RFD cavities Cavity Designs – 952.6 MHz RFD cavities at 952.6 MHz are analyzed with 60 mm and 70 mm apertures Single-cell RFD cavities 3-cell RFD cavities 17.4 cm 16.7 cm 6 cm 7 cm 19.5 cm 18.5 cm 6 cm 7 cm 54 cm Suba De Silva, March 10, 2017

Properties Suba De Silva, March 10, 2017 1-cell-60-mm 1-cell-70-mm 1.198241 -0.19502 -7.4E-14 -1.1E-13 [V] vt 993427.4 1.40E+06 996384.8 1.20E+06 995040.1 4.70E+06 996397.8 4.20E+06 b0 0.00E+00 mT m-2 b1 3.313717 4.67E+00 3.323582 4.00E+00 3.319097 1.57E+01 3.323625 1.40E+01 mT m-1 b2 -0.00125 -1.76E-03 0.000142 1.71E-04 -3.7E-14 -1.75E-13 -3.6E-14 -1.52E-13 mT b3 825.8092 1.16E+03 783.2271 9.43E+02 670.5537 3.17E+03 600.0219 2.53E+03 mT m b4 3.708484 5.23E+00 -0.30024 -3.62E-01 -1.4E-10 -6.51E-10 -1.3E-11 -5.29E-11 mT m2 b5 -89166.2 -1.26E+05 -41537.9 -5.00E+04 -110617 -5.22E+05 -50855.7 -2.14E+05 mT m3 b6 -7811.98 -1.10E+04 457.7888 5.51E+02 -9.3E-08 -4.39E-07 1.11E-07 4.68E-07 mT m4 b7 -1.3E+07 -1.89E+07 -1.2E+07 -1.49E+07 -3.1E+07 -1.49E+08 -1.4E+07 -5.74E+07 mT m5 Suba De Silva, March 10, 2017