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1

2 H21 LHCf LHCf /LHC H20 H GeV collision 1.2 TeV, TeV, 7 TeV, HI,

3 LHCf LHC 450 GeV 7 TeV ev TA

4 21 1 LHCf-TA joint meeting

5 LHCf Japan spokesperson, technical coordinator

6 LHCf collaboration LHCf Japan Italy Univ. di Firenze O. Adriani, L. Bonechi, M. Bongi, G.Castellini, R. D Alessandro, M. Grandi, H. Menjo July, P. Papini, S. Ricciarini, A. Viciani Univ. di Catania A. Tricomi Spain Centro Mixto CSIC-UVEG, Valencia D.A. Faus, J. Velasco France Ecole-Polytechnique, Paris M. Haguenauer USA UC Berkeley W.C. Turner Switzerland CERN D. Macina, A.-L. Perrot

7 UHECR log(j)xe 3 [m -2 sr -1 s -1 ev 2 ] AUGER ICRC2007 Auger ev Xmax[g/cm2] GZK log(e[ev]) E[eV] LHCf

8 LHC 450GeV 7TeV 450GeV

9 LHCf CERN LHC Large Hadron Collider 450GeV 450GeV 7TeV 7TeV ev ev ev

10 LHC 7TeV 7TeV 27km = =

11 LHCf: location and experimental layout Arm#1 detector Tungsten Scintillator Scintillating fibers INTERACTION POINT IP1 (ATLAS) 140 m 140 m Arm#2 detector Tungsten Scintillator Silicon µ-strips Front counter 1 Front counter 2 Beam line (IP1) 140m TAN =8.4, 0, P t luminocity cm 2 s -1 commissioning multiplicity, DAQ rate, radiation damage Arm#1 Arm#2 Redundancy,

12 LHCf Detectors Imaging Sampling Calorimeter W 44 r.l, 1.6 I Plastic scintillator 16 layers Position Detector Scifi 4 (Arm#1) x = 0.17mm Silicon Tracker 4 (Arm#2) x = 0.05mm Energy Resolution <5% (gamma), 30% (hadron) ARM#2 2 Arm#1 20mm 40mm Arm#2 25mm 32mm 2 0 CERN/SPS ARM#1

13 Arm#1 Arm#2

14 Front Counter 40mm 80mm 40mm 40mm 40mm40mm Front Counter 20mm 80mm Arm#1 Arm4ch Beam monitor BG suppression Arm1 2mm Arm2 2.5mm

15 Front Counter Front Counter calorimeter Cu bar Beam pipe TAN Front Counter

16 simulation Simulation 20mm Calorimeter For 7 TeV collisions

17

18

19 LHCf Letter of Intent SPS/CERN Technical Report Technical Design Report LHC Committee Arm#1 SPS Arm#1/#2 SPS Arm#1/# LHC first beam event LHC stop Beam

20 LHC LHC first beam LHC LHC commissioning 450 GeV LHCf 11/ GeV beams 1&2 11/ GeV collision Beam commissioning 12/6 450 GeV stable beams 12/ TeV 12/ GeV stable beams, collision data of LHCf 12/ TeV collisions 12/16 LHC stop

21 LHCf DAQ, Front counter, Laser calibration MC GeV GeV TeV stable beam

22 Arm2 Arm1

23 First collision data of LHCf Arm1 Longitudinal development Lateral (X) Distribution Lateral (Y) Distribution

24 First collision data of LHCf Arm2 Longitudinal development Lateral (X) Distribution Lateral (Y) Distribution

25 Thanks to Alick and Guy, we provide counting rates on Vistar Each FC (collision+beam gas+halo) Double arm FC (collision)

26 Hit map of gamma-ray (shadow of beam pipe) O : collision + BG : BG only Shower Incident position =8.7 =

27 Aperture

28 Energy spectrum (to be calibrated to incident energy) Bunch Crossing beam-beam, beam-gas, beam halo Single Bunch beam-gas, beam halo Acceptance A arm2 = 1.5 A arm1

29 Particle ID by shower shape Particle ID

30 LHC LHCf 450 GeV TeV 3.5 TeV / 5 TeV Physics 2010 Heavy ion Pb TeV LHCf: machine commissioning L cm 2 s -1

31 END Arm#1

LHC ALICE (QGP) QGP QGP QGP QGP ω ϕ J/ψ ALICE s = ev + J/ψ

LHC ALICE (QGP) QGP QGP QGP QGP ω ϕ J/ψ ALICE s = ev + J/ψ 8 + J/ψ ALICE B597 : : : 9 LHC ALICE (QGP) QGP QGP QGP QGP ω ϕ J/ψ ALICE s = ev + J/ψ 6..................................... 6. (QGP)..................... 6.................................... 6.4..............................

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