After LS1: wish list from LHCf Takashi SAKO for the LHCf Collaboration 11-Dec-2012LPC meeting1

Constraints Radiation damage – Upgraded for rad-hard GSO scintillators – No effect <1kGy (500 nb – Available <1MGy (500 pb -1 ) DAQ speed – No update since 7TeV run – >2μs event-to-event interval (<43 bunch) – No capability of pileup separation; μ<= Dec-2012LPC meeting2

Wish list Take clean data before 500 nb -1 – N b < 43 – β * = 11m (1mm dispersion on the detector) – L < cm -2 s -1 – 10 nb -1 at each energy Energy scan for extrapolation to CR energy – 7 TeV to confirm previous data – 3.5TeV, 2.2TeV,… energy to be discussed (note: LHCf did not take data at 2.36TeV) 11-Dec-2012LPC meeting3

4 Cosmic-ray spectrum & Colliders LHC 14 TeV Tevatron LHC 0.9TeV LHC 7 TeV SppS RHIC ISR eV Knee: end of galactic proton CR End of galactic CR and transition to extra-gal CR Ankle (GZK) cutoff: end of CR spectrum LHC 3.5 TeV