Vacuum status at KEKB. Junji Haba. KEKB Vacuum system. Vacuum monitoring. HER vacuum characteristics. Dependence on HER current is clear. ~ 0.3 (0A) 1.2 (1.3A) x10 -7 Pa 1nTorr (PEPII) =1.3 x 10 -7 Pa (KEKB) Far from “base pressure dominance” Not always simple linear relation - PowerPoint PPT Presentation
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Vacuum status at KEKBJunji Haba
KEKB Vacuum system
Vacuum monitoring
HER vacuum characteristicsDependence on HER current is clear. ~
0.3 (0A) 1.2 (1.3A) x10-7Pa 1nTorr (PEPII) =1.3 x 10-7 Pa (KEKB)Far
from base pressure dominanceNot always simple linear relationSome
show a clear thermal behaviorBeam life time is a function not only
of pressure but also luminosity or beam-beam effect.
2004 June 14-20
Discharge startsaround 0.9A at septum?Heat up at the feed back
kicker structure
Life time is predetermined by luminosity
Beam-beam also affects the lifetimeLER currentHER beam size vs
LER currentHER life and beam size
LER vacuum characteristicsCurrent dependence is clear~ 0.2 (0A)
0.8 (1.6A) x10-7PaThermal behavior everywhere we have the parts
with a special internal shape like GV, crotches, injection chamber
etc.
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