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Current status and plan of the LHCf experiment (LHCf; Large Hadron Collider forward)

Current status and plan of the LHCf experiment (LHCf; Large Hadron Collider forward). Takashi SAKO (Solar-Terrestrial Environment Laboratory, Nagoya University, Japan) for the LHCf collaboration. For more details, please go to the posters

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Current status and plan of the LHCf experiment (LHCf; Large Hadron Collider forward)

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  1. Current status and plan of the LHCf experiment(LHCf; Large Hadron Collider forward) Takashi SAKO (Solar-Terrestrial Environment Laboratory, Nagoya University, Japan) for the LHCf collaboration For more details, please go to the posters Sako 75 Performance tested with SPS beam Menjo 221 Pi-zero measurement Ricciarini 318 Siliconstrip detector Taki 935 Background in LHC Nakai 953 Particle identification Mase 1113 Neutron measurement 31th International Cosmic Ray Conference, Lodz, Poland

  2. Target of LHCf • To reduce the uncertainty of hadron interaction models by using LHC • LHCf measures neutral particles emitted in very forward (including zero degree) in the LHC collisions • To discriminate existing interaction models and provide crucial data for future models

  3. The LHCf Collaboration Y.Itow, K.Kawade, T.Mase, K.Masuda, Y.Matsubara, G.Mitsuka, T.Sako, K.Taki Solar-Terrestrial Environment Laboratory, Nagoya University, Japan K.Yoshida Shibaura Institute of Technology, Japan K.Kasahara, M.Nakai, S.Torii Waseda University, Japan T.Tamura Kanagawa University, Japan Y.Muraki Konan University Y.Shimizu ICRC, University of Tokyo, Japan M.Haguenauer Ecole Polytechnique, France W.C.Turner LBNL, Berkeley, USA O.Adriani, L.Bonechi, M.Bongi, R.D’Alessandro, M.Grandi, H.Menjo, P.Papini, S.Ricciarini, G.Castellini, A. Viciani INFN, Univ. di Firenze, Italy A.Tricomi INFN, Univ. di Catania, Italy J.Velasco, A.Faus IFIC, Centro Mixto CSIC-UVEG, Spain D.Macina, A-L.Perrot CERN, Switzerland

  4. Xmax (g/cm2) Number of particles Atmospheric depth Hadron Interaction Models and EAS development Knapp et al. Iron Proton Proton Iron Energy (eV) Knapp et al., 2003 Measurements of very forward particles using the highest energy accelerator are important to constraint the models

  5. CMS / TOTEM 96mm interaction point 1 140m ALICE LHCb ATLAS / LHCf Forward measurement at LHC • Collision of 7TeV proton + 7TeV proton at LHC corresponds to 1017eV @ lab. System • Zero degree instrumentation slot at 140m away from IP

  6. Arm#1 Detector 20mmx20mm+40mmx40mm 4 XY SciFi+MAPMT Arm#2 Detector 25mmx25mm+32mmx32mm 4 XY Silicon strip detectors LHCf Detectors • Sampling & imaging calorimeters either side of IP1 • Two small tower calorimeters in both detectors (Tungsten 44r.l., 1.7λ, 16 plastic scintillator sampling layers, 4 position sensitive layers)

  7. Resolutions at beam test & MC Beam Test at CERN SPS compared with MC using EPICS (Poster 75, Sako et al) Energy Resolution at different gains ΔE/E<5% at E>100 GeV Position Resolution of SciFi <200μm Excellent agreement between beam test and MC is obtained

  8. 90mm 280mm Arm#1 Detector Arm#2 Detector Double Arm Detectors

  9. BABY SIZE DETECTOR! 64cm 62cm

  10. LHCf detector in the LHC tunnel

  11. LHCｆ Operation • Data taking during the commissioning of LHC at very low luminosity ( typ. L=1029cm-2s-1) －1kHz single gamma-ray events －10 Hz π0 →2γ events (after all analysis process) • Hour(s) of operation gives sufficient statistics Expected energy spectra of single gamma-rays 100sec @ L=1029cm-2s-1 EPOS 1.99 will join soon

  12. π0 Measurement Peak=134MeV σ=4.9MeV (Poster 221, Menjo et al. for detail) • Full MC using DPMJET-III considering trigger, electrical noise, analysis (aperture correction) • Histograms; (production)×(geometrical aperture) • 103 sec operation at L=1029 is assumed

  13. New models(PICCO, EPOS) Proton Drescher, Physical Review D77, 056003 (2008) Pi0 Neutron QGSJET-II EPOS1.61 EPOS1.61 QGSJET-II

  14. Possible Realistic Time Table(not official !!) Beam Energy (TeV) Lab. Energy (eV) 1.0x1017 7 5.1x1016 5 1.8x1016 3 ? 4.1x1014 0.45 LHCf Operation 2009 2010 2011-

  15. Summary • LHCf can provide critical calibration data for hadron interaction models used in the EAS study • Detectors, DAQ of LHCf are ready • In 2009, data taking at 450GeV, <5TeV collisions will be carried out • One day operation gives sufficient data (not only statistics, also for systematics study) • Simulation studies for <7TeV are in progress • 5-7 TeV collisions will be after 2011

  16. Thank You

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