LHC LHCf news Good news and bad news

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LHC & LHCf news Good news and bad news T. Sako @ ICRR 4

LHC & LHCf news Good news and bad news T. Sako @ ICRR 4 Oct. 2008

LHCf 9/10 -9/12

LHCf 9/10 -9/12

Search for BPTX synchronized signal in LHCf Front Scintillator LHCf Arm 1 LHCf Arm

Search for BPTX synchronized signal in LHCf Front Scintillator LHCf Arm 1 LHCf Arm 2 beam 2 Front Counter (thin plastic scintillator) 12 -Sep-2008 Beam-gas expected By the LHCf collaboration

detail • • 116 FC triggers on 8, 275, 034 BPTX 2 x 109

detail • • 116 FC triggers on 8, 275, 034 BPTX 2 x 109 protons per bunch 116 triggers on N=1. 7 x 1016 protons Suppose; – Gas density ρ[cm-3] – Effective distance L= 100 [m] = 10, 000 [cm] – Cross section σ=80 [mbarn] • ρLσN = 116 • ρ= 8. 5 x 106 H [cm-3] = 8. 5 x 1012 H [m-3] = 4 x 1012 H 2 [cm-3] • 1012 H 2 [cm-3] is predicted in LHC Project Report 783 • (LHCf aperture is ignored above)