1 / 27

H A R P A Hadron Production Experiment at the Proton Synchrotron at CERN

H A R P A Hadron Production Experiment at the Proton Synchrotron at CERN. Motivation for the HARP experiment The HARP Detector MiniBooNE and HARP. HARP Motivation (general). Measure absolute inclusive cross-sections for Hadron production with a range of

rodd
Download Presentation

H A R P A Hadron Production Experiment at the Proton Synchrotron at CERN

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. H A R PA Hadron Production Experiment at the Proton Synchrotron at CERN • Motivation for the HARP experiment • The HARP Detector • MiniBooNE and HARP

  2. HARP Motivation (general) Measure absolute inclusive cross-sections for Hadron production with a range of targets and primary proton energies.

  3. HARP Motivation (specific) • Neutrino Factory Design • Atmospheric Neutrino Flux Calculations • Neutrino Fluxes for MiniBooNE and K2K • Input to Monte Carlo simulation packages

  4. Neutrino Factory Need to Know: 1. production rates for varying target materials, target size and proton beam energies (2-24GeV). 2. The PT distribution with high precision to optimize muon collection.

  5. Atmospheric Neutrinos Need to Know: 1. Primary Cosmic Ray Flux* 2. Hadron Interaction Model** * known to better than 10% **limited data leads to ~30% uncertainty in atmospheric neutrino fluxes _

  6. MiniBooNE Flux + 8 GeV p Be K+ source of  source of e background e+ source of e background K+ e+ source of e background K0L e+

  7. HARP at the CERN PS • 200 meters in diameter • 28 GeV maximum energy • Feeds into SPS • Used to make anti-protons • Used for target expr. - HARP

  8. HARP at the CERN PS East Hall

  9. T9 Secondary Beam at PS • PS protons hit a target producing secondary particles. • Particles are momentum selected allowing HARP to choose beam energy (2 -15 GeV). • However, beam consists of different particles - mainly protons and pions. • TOF measurements distinguish different particles in the beam before hitting the HARP target. NOTE: This is different from MiniBooNE. MiniBooNE gets 8 GeV protons directly from the Booster.

  10. HARP Detector

  11. HARP Detector

  12. Time Projection Chamber - TPC 10-1 1 10 p(GeV/c)

  13. Resistive Plate Chamber -RPC HV + + + ++ + + + ++ Gas Gas + + + ++ + + + ++ HV

  14. TPC & RPC

  15. TPC - RPC Event

  16. HARP Detector

  17. Drift Chambers & Spectrometer Magnet • 0.5 T Vertical Field for momentum spectrometry • Vertical, +5°, -5° wire orientation in drift chambers • 90% Argon, 5% CO2, 5% CH4 gas mixture • 150m - 700m resolution depending on incident angle • Typical single chamber efficiency of 97% + -

  18. Drift Chambers & Spectrometer Magnet

  19. HARP Detector

  20. Threshold Cerenkov Detector • Filled with C4F10 (perflourobutane) at atmospheric pressure. • Discriminates between protons and pions at high momentum. • At high beam momentum, strange particles (kaons) are also created. C4F10 properties: n = 1.001415 pion threshold = 2.6 GeV/c kaon threshold = 9.3 GeV/c proton threshold = 17.6 GeV/c

  21. HARP Detector

  22. TOF Wall, Electron Identifier,Cosmic Trigger Wall,Beam Muon Identifier TOF Wall - plane of scintillator counters to discriminate between protons and pions at low momentum t ~ 210 ps) Electron Identifier - lead-scintillating fiber counters to discriminate between hadrons on the one hand, and photons and electrons on the other. Cosmic Trigger Wall - plane of scintillator sheets to trigger on cosmic muons for monitoring and calibration. Beam muon Identifier - iron-scintillator calorimeter to identify beam muons.

  23. Pion Production and pi/pPID PT vs. PL Box Plot for pion Production (@15GeV) TPC TOF Cerenkov

  24. HARP Targets • Beryllium • Carbon • Aluminum • Copper • Tin • Titanium • Lead } solid targets 2%, 5%, 50%, 100%  neutrino factory, MiniBooNE, K2K } • Hydrogen • Deuterium • Nitrogen • Oxygen cryogenic targets atmospheric neutrino flux

  25. MiniBooNE and HARP Production Rates Decay Now Goal ~50% 5% e+ ~50% 5% ~100% 10% K+ e+ K0L ~100% 10% e+

  26. MiniBooNE & HARP • 1.3M events recorded in 2001 for 8 GeV protons on a 2%  Be target • In August, 2002, data will be taken for a 5% and a 50% Be target 2% 5% 50% MiniBooNE Target

  27. HARP 2002 Data Taking • Scheduled for 140 days of running in 2002 • 28 days for cryogenic targets • 14 days for special targets • 7 days for setup and calibration • 91 days to run all targets and beam energies • Cross-section measurements at the 1-2% level should be achievable.

More Related