Crab crossing and crab waist at super KEKB. K. Ohmi (KEK) Super B workshop at SLAC 15-17, June 2006 Thanks, M. Biagini, Y. Funakoshi, Y. Ohnishi, K.Oide, E. Perevedentsev, P. Raimondi, M Zobov.
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Crab crossing and crab waist at super KEKB
K. Ohmi (KEK)
Super B workshop at SLAC
15-17, June 2006
Thanks, M. Biagini, Y. Funakoshi, Y. Ohnishi, K.Oide, E. Perevedentsev, P. Raimondi, M Zobov
xx is smaller due to cancellation of tune shift along bunch length
V~10 MV or more
Not very strong
() strong-strong , horizontal size blow-up
Horizontal blow-up is recovered by choice of tune. (M. Tawada)
ex=24 nm ey=0.18nm bx=0.2m by=1mm sz=3mm
ex=18nm, ey=0.09nm, bx=0.2m by=3mm sz=3mm
Lower coupling becomes to give higher luminosity.
Only 2ny signal was observed.
M. Tawada et al, EPAC04
(work with E. Perevedentsev)
if zero-crossing angle and no error.
Lpeak=8x1035. Bunch length 2.5mm is required for L=1036.
Hard parameters are required ex=0.4nm bx=1cm by=0.1mm.
If a possible sextupole configuration can be found, L=1036 may be possible.