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Low Momentum dE/dx Testbeam

Low Momentum dE/dx Testbeam. H.P. 7/24/98. Goals for Spectrometer. are based on tracking and PID Multiparticle correlation production of particle species Pt distributions all that this emphasis on low p t what do we need? Tracking -> based on the pad signals

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Low Momentum dE/dx Testbeam

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  1. Low Momentum dE/dx Testbeam H.P. 7/24/98

  2. Goals for Spectrometer • are based on tracking and PID • Multiparticle correlation • production of particle species • Pt distributions • all that this emphasis on low pt • what do we need? • Tracking -> based on the pad signals • PID in high momentum range ->based on dE/dx • PID in low momentum & stopping range-> based on dE/x

  3. The high pt range Range out(in 7 planes) 55 MeV/c p 135 MeV/c K dE/dx 650 MeV/c p /K 1000 MeV/c K/p TOF 1150 MeV/c p /K (y-dep) 1900 MeV/c K/p • Good separation requires • good understanding of the detector • algorithms that are tuned to OUR detector

  4. The low Pt range-stopping p,K,p • The problems: • few dE/dx measurements/particle • no magnetic field in first 6 planes • little help from TOF Need to rely on dE/dx measurement in range where very little is known about the response of silicon detectors

  5. Our dE/dx range ...

  6. Spectrometer Acceptance

  7. We are well equipped for dE/dx... • We achieved good signal/noise-> allows a dE/dx measurement with good precision • We studied detector properties of Type 1 and 5 with source and high momentum testbeam (little crosstalk, good signal uniformity) • We designed and implemented a calibration system-> measure and monitor the electronics gain • We have fully working final modules ready for tests

  8. The proposed dE/dx testbeam • measure dE/dx in silicon for >50MeV/pions and >200MeV kaon and proton • measure the signal response for stopping p,K,p ? • A proposed setup identical to first 4 spectrometer planes: 4 Type 1 modules TOF scintilators for PID This testbeam can be done in collaboration with the Insitute of High Energy Physics /Vienna

  9. The currently most promising beamline (AGS E913) • Steve contacted Brad Tippens (E913 spokesperson) • -> we are invited to run behind E913 during September • The beam line • can supply p, K, eventually proton • has full TOF measurement in place, where we can get TOF measurement • initial beam Dp/p = +-4%, with TOF good to 4-5MeV • sufficient space available for detectors and electronics • they plan to vary energies in their run furing September • we need to run their energies (-> close coordination) • need to confirm possible energies/rates/composition

  10. TOF stop (963cm) TOF start 1.9m E913 A possible setup ... E913 present energies pion >200MeV/c kaon>500MeV/c protons>? this is the range where we claim to be able to separate p/K

  11. Sharing of responsibilities • The HEPHY/Vienna takes main responsibility for the DAQ • they are currently building a 12-bit 4 channel VME board with VA control dedicated for this test • they can supply a TDC in necessary • they can supply limited workshop time for mechanical parts • they will send 2 person for 2 weeks for the beam tests and later plan to work on analysis with 1 student in Vienna • Our responsibility: detector and beam line preparation • prepare, test and calibrate 4 type 1 modules • prepare beam line (detector support& cooling , cables, 1 VME crate, 1 PC) • send 2 person for preparation and data taking • participate in analysis (I would assume…)

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