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Published byCharles St-Denis Modified over 6 years ago
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First look at final focus part of super-B factory
March 16, 2006 Andrei Seryi
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Config. & parameters from Pantaleo
Configuration: Parameters: Energy: 5GeV Emittances(n): 4*0.02 E-6 m IP betas: 17.6*0.08 mm IP sizes: 2.68* um IP divergence: *159.8 urad Energy spread: 0.1%
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Design of FF Use NLC/ILC like final focus
Use L*=0.5m (also tried L*=1m) Angular dispersion at IP is 70urad (half of the x-divergence at 0.1% energy spread) Design can be further optimized…
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Optics of FF
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Final doublet part
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Bandwidth from MAD
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Chromaticity along the ff
Some lengthening would help to decrease non-FD chromaticity
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Remaining aberrations and tracking
Aberration terms from Transport Tracking with Turtle (100k particles): sge=0.1% sigma_x,y = , um sigma/sigma_0 = , Remaining terms probably can be decreased further if they are important
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Tracked bandwidth
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Magnets Assumed that most of quads have r=1cm, L=0.5m and pole tip field in the optics is no more than 5kGs For FD: QF1: r=1.5cm , L=0.4m, B=6.4kGs QD0: r=1cm, L=0.5m, B= 7.4kGs
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IR layout With L*=0.5m has to use common QD0? Needs to be looked…
If the L* would be ~0.8m, one can use separate beamlines with BNL direct wind compact quads, similar as for ILC 20/14mrad IR: ILC IR layout, self-shielding QD0 proposed by Brett Parker, and production of quad test for ILC at BNL. This self shielding QT was recently successfully tested.
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Summary Optics of FF can be designed
Requirements of the ring to aberrations in FF need to be checked IR layout need to be discussed
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