Pb for LHC: requirements summary D.Manglunki. Why upgrade?. ALICE Upgrade approved: Request for peak luminosity “higher tha n L=6x10 27 cm -2 .s -1 ” after LS2 Programme in coming years: HL Pb-Pb (today) Ar & Xe.
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Luminosity increaseNote: current brightness performance is already 2 x design
Nb of bunches
~912100/50 ns scheme
(1.1 109 Pb ions / 3.6 s)
PS batch compression + rebucketingBunch spacing = 100ns
SPS at extraction,after 24 transfers from PS,
Batch spacing = 50 ns
LHC at injection,after 19 transfers from SPS
b* =0.4 m -> L = 7x1027 cm-2s-1
Source & LINAC