1 / 24

LHCf - an experiment for measuring the very forward production of neutral particles at the LHC

LHCf - an experiment for measuring the very forward production of neutral particles at the LHC W.C. Turner LBNL for the LHCf Collaboration Presented at the Aspen Workshop on Cosmic Rays 15-19 Apr 2007. The LHCf Participants. Nagoya University, Japan

makana
Download Presentation

LHCf - an experiment for measuring the very forward production of neutral particles at the LHC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LHCf- an experiment for measuring the very forward • production of neutral particles at the LHC • W.C. Turner • LBNL • for • the LHCf Collaboration • Presented at the Aspen Workshop on Cosmic Rays • 15-19 Apr 2007 W.C. Turner – The LHCf Experiment

  2. The LHCf Participants • Nagoya University, Japan • K. Fukui, Y. Itow, T. Mase, K. Masuda, Y. Matsubara, H. Matsumoto, H. Menjo, • T. Sako, K. Taki, H. Watanabe • Kanagawa University, Japan • T. Tamura • Konan University • Y. Muraki (Spokesperson), • Waseda University, Japan • K. Kasahara, Y. Shimizu, S. Torii • Shibaura Inst. of Tech., Japan • K. Yoshida • University of Florence, Italy • O. Adriani, L. Bonechi, M. Bongi, G. Castellini, R. D’Alessandro, P. Papini • University of Catina, Italy • A. Tricomi • Univerity of Valencia, Spain • A, Faus-Golffe, J. Valesco • CERN, Switzerland • D. Macina, A.-L. Perrot • Ecole-Polytechnique Palaiseau, France • M. Hauguenauer • Lawrence Berkeley Laboratory, USA • W.C. Turner W.C. Turner – The LHCf Experiment

  3. Outline • Motivation and History of LHCf • The LHC Environment • The LHCf Detectors • Anticipated LHCf Performance • SPS Beam Test and Monte Carlo Results • Installation and Schedule W.C. Turner – The LHCf Experiment

  4. Motivation and History • Use 7+7 TeV pp collisions to benchmark neutral particle production cross sections at 1017eV laboratory equivalent energy • Useful for cosmic ray simulations, contribute to resolution of super GZK and composition questions • Previous experiment UA7 performed at SPPS 400 + 400 GeV, 1014 eV (E. Pare et al, Phys. Lett., B242 (1990)) • Present Experiment LOI submitted to LHCC in May 2004 and TDR approved in 2006 • Prototype detector tested at SPS H4 in 2004 and final detector in 2006 • First detector installed at IP1 in Jan 2007 W.C. Turner – The LHCf Experiment

  5. IP5, CMS IP1, ATLAS, LHCf IP8, LHCb IP2, ALICE The LHCf detectors are located +/-140m from IP1 in LHC W.C. Turner – The LHCf Experiment

  6. Interaction region TAN neutral particle absorber • The TAN absorbs forward neutral collision products (mostly • neutrons and photons) and is placed in front of the outer beam separation • dipole D2 to protect superconducting magnets • LHCf exploits the opportunity to install detectors inside the TAN for • measurement of very forward neutral particle production cross sections W.C. Turner – The LHCf Experiment

  7. Instrumentation slot (96mm x 60.7mm x 1000mm) IP, +140m ~ 5m Exploded view of the TAN and transition beam tube W.C. Turner – The LHCf Experiment

  8. The LHCf detectors are compact sampling and imaging calorimeters • Measure 100 GeV - 7 TeV gammas and neutrons • Detectors are located on both sides of IP1 (Arm#1 and Arm#2) for coincidence studies and redundancy • Each Arm consists of two “tower” calorimeters for separately measuring the two gammas from p0 decay • 44 radiation lengths of W plates interleaved with 16 scintillation panels (overall length 25cm) • Transverse cross sections 20mm x 20mm + 40mm x 40mm Arm#1 and 25mm x 25mm + 32mm x 32mm Arm#2 • Four position sensitive layers measure the transverse center of the showers • Arm#1 SciFi (1mm x1 mm) • Arm#2 Si microstrip detectors(80mm pitch) W.C. Turner – The LHCf Experiment

  9. LHCf tower calorimeter illustrations Arm#1Arm#2 SciFi x-y layer Si microstrip x-y layer Scintillator 25cm W plates W.C. Turner – The LHCf Experiment

  10. Arm#1 during assembly 32 PMTs + 8 MAPTs Light guides Tower calorimeters W.C. Turner – The LHCf Experiment

  11. Transverse projection of LHCfand beam pipe acceptance W.C. Turner – The LHCf Experiment

  12. LHCf Arm#1 acceptance “450 mrad” <=> 140 mrad xing angle “310 mrad” <=> 0 mrad xing angle W.C. Turner – The LHCf Experiment

  13. PMT + scintillator linearity ~+/- 2% over anticipated dynamic range • Dynamic range req’d: 1 mip (muon calibration of light collection efficiency) • to • 7x104 mips (7 TeV gamma shower max) “mips” simulated with Nitrogen Laser excitation of scintillator W.C. Turner – The LHCf Experiment

  14. The LHCf team for 2006 SPS Beam Tests W.C. Turner – The LHCf Experiment

  15. SPS H4 Setup W.C. Turner – The LHCf Experiment

  16. SPS test beam 2004 results BeamEnergy(GeV)Measurements Electron beam 50, 100, 150, Simulate photon showers, 200 measure energy resolution, spatial resolution and shower leakage Proton beam 150, 350 Simulate neutron showers Muon beam 150 Obtain calibration for single mip, measure non-uniformity of light collection efficiency W.C. Turner – The LHCf Experiment

  17. Light efficiency correction measured with a muon beam W.C. Turner – The LHCf Experiment

  18. Shower leakage, energy resolution, SPS data +MC • Fig. 7 MC simulation, include it? W.C. Turner – The LHCf Experiment

  19. MC simulation shows the shower leakage fraction is energy independent W.C. Turner – The LHCf Experiment

  20. Position resolution W.C. Turner – The LHCf Experiment

  21. e-p/g-n separation • LHCf = 44rad lengths, 2 hadron interaction lengths • L20-90 = discrimination parameter • = distance between 20% and 90% of longitudinal sum of shower particles W.C. Turner – The LHCf Experiment

  22. MC calculations of p0 mass and neutron energy resolutions Neutron energy res ~ 30% p0 inv mass res ~ 5% W.C. Turner – The LHCf Experiment

  23. Arm#1 pre-installed Jan 07, Arm#1&2 final installation ~ Sep 07 IP1 140m away LHCf Arm#1 TAN W.C. Turner – The LHCf Experiment

  24. Plans for future operation with LHC • “450 x 450 GeV Engineering Run” ~Oct - Dec 2007 • (Could get delayed to 2008 owing to inner triplet problems! Will know in mid-May.) • Observe first pp collisions and background rates due to beam-gas, beam halo collisions etc • Low event rates owing to reduced acceptance, • single g >10GeV ~20Hz • p0 reconstruction below background • “Stage 1” 7 TeV x 7 TeV beam commissioning ~Jun - Sep 2008 • Luminosity ~1029cm-2 s-1, inelastic collision rate ~ 8kHz • 43 x 43 bunches => 2msec bunch spacing matches max DAQ rate • Single g>100GeV rate ~ 800Hz • Two gp0 rate ~ 80Hz (106 events in 3.5 hrs) • Two arm coincidence ~ 80Hz • Neutrons >100GeV ~ 4kHz • Remove LHCf when Luminosity > 1030cm-2 s-1 to avoid rad. damage W.C. Turner – The LHCf Experiment

More Related