SuperKEKB Mini Workshop November 28, 2003. Machine parameters of SuperKEKB. Y. Ohnishi / KEK. Luminosity. Luminosity formula: Alternative luminosity formula: Beam-beam parameter: Transparency condition:. N : number of particles/bunch f : collision frequency. s y * / s x * = 1%-6%
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N : number of particles/bunch
f : collision frequency
sy*/sx* = 1%-6%
w/o dynamical effect
due to beam-beam
Assumed that no beam size blowup due to electron cloud.
Luminosity 1035 is optimized by by*=3 mm, xy=0.05, I=9.4/4.1 A.
(Ohmi, beam-beam simulations)
Refs. : Yokoya, Oho2003, Juhao Wu, G. Stupakov, et al., SLAC-PUB-9629, G. Stupakov and S. Heifets, PR-ST vol.5 054402
Short range in a bunch !
height : h
If chamber height >> h,
reflected light reaches after
bunch passes through.
shielding cut-off wave length :
lc ~ 4 mm (r=23/2/p1/2) in LER
SR at longer wave length is shielded.
Coefficient r has less accuracy.