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E906 Spectrometer Upgrade Overview

E906 Spectrometer Upgrade Overview. Paul E. Reimer Experimental Approach Impact on Fermilab Magnet Coil Fabrication Spectrometer Upgrades. x target. x beam. Drell-Yan scattering: A laboratory for sea quarks. Detector acceptance chooses x target and x beam .

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E906 Spectrometer Upgrade Overview

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  1. E906 Spectrometer Upgrade Overview Paul E. Reimer Experimental Approach Impact on Fermilab Magnet Coil Fabrication Spectrometer Upgrades

  2. xtarget xbeam Drell-Yan scattering: A laboratory for sea quarks Detector acceptance chooses xtarget and xbeam. • Fixed target ) high xF = xbeam – xtarget • Valence Beam quarks at high-x. • Sea Target quarks at low/intermediate-x. E906 Spect. Monte Carlo Paul Reimer E906 Sepctrometer Upgrade Overview

  3. Physics Requirements • Fundamentally want to measure and compare cross sections from a variety of targets as functions of di-muon Mass, x1, x2 • Identify muons—hadron absorber and muon id wall • Wide acceptance for desired muon kinematics • Resolve kinematics: • Measure momentum of muons, reconstruct M, pL, x1, x2 • Depends on muon track reconstruction (through magnets) • Momentum measurement (2nd magnet strength) • Minimize background—muons from hadron decays • Absorber hadrons in dump and absorber before leptonic decay • Separate muon vertex—target vs. dump Paul Reimer E906 Sepctrometer Upgrade Overview

  4. Trigger electronics Scintillator Hodoscopes E906 Spectrometer: Non-bend plane view Paul Reimer E906 Sepctrometer Upgrade Overview

  5. Detector Resolution • Triggered Drell-Yan events 0.04 x2 Res. 240 MeV Mass Res. Paul Reimer E906 Sepctrometer Upgrade Overview

  6. Basic Approach to Measuring Drell-Yan Scattering Follow lead of pervious experiments: • Proton beam on frequently interchanged targets • 2 magnet spectrometer • 1st magnet focuses muons into spectrometer • 2nd magnet provides momentum measurement • Beam dump within 1st magnet • Graded hadron absorber within 1st magnet to prevent interact hadrons before decay Final  identification Tracking/Triggering Stations Target 2nd magnet 1st magnet Paul Reimer E906 Sepctrometer Upgrade Overview

  7. Spectrometer upgrade E906 • Smaller Boost at 120 GeV than 800 GeV • Lorentz contract detector from 60 m to 25 m • Requires new focusing magnet • Largest (non-Fermilab) part of upgrade • New Station tracking chambers for higher background rates • New Hodoscopes (material aging) • New trigger (rates and flexibility) E866 Paul Reimer E906 Sepctrometer Upgrade Overview

  8. M1 Magnet • New coils • Reuse whole pieces of SM12 magnet yoke (SM12 was the 14.4 m dipole used by E866) Paul Reimer E906 Sepctrometer Upgrade Overview

  9. M1 Magnet Coil Fabrication Budget • Cost dominated by cost of conductor and coil ($1.3M of $1.6M) Paul Reimer E906 Sepctrometer Upgrade Overview

  10. Magnet Gantt Chart Paul Reimer E906 Sepctrometer Upgrade Overview

  11. Spectrometer Upgrade—Increased Rates • Significantly higher instantaneous luminosity in E906 (10£beam intensity) • Smaller boost ) larger chance for mesons to decay before interaction in beam dump Solutions: • Replace Station 1 Drift Chambers with MWPC’s (WBS 2.2.1—Colorado) • More flexible trigger (still modeled after E866, but in FPGA rather than LeCroy units) (WBS 2.3—Rutgers) • Double ended readout and mean timers on Station 3 and 4 hodoscopes (for single rf “bucket” resolution—19 ns) (WBS 2.1.1 and 2.1.3—Abilene) Paul Reimer E906 Sepctrometer Upgrade Overview

  12. Spectrometer Upgrades—Aging Equipment • E866 Station 3 and 4 scintillator dates from E605 in 1982 • E866 Station 2 scintillator from 1989 upgrade—surplus material shows significant crazing • Large trigger efficiency corrections for some individual hodoscope elements observed in E866 • E866 Station1 of insufficient size for E906 Solution: • Replace Scintillator with newer material • Stations 1 and 2 recovered from HERMES muon hodoscope (WBS 2.1.2, Illinois) • Station 3 and 4 new material (WBS 2.1.3, Abilene) Paul Reimer E906 Sepctrometer Upgrade Overview

  13. Spectrometer Elements Upgrade Budget • Primarily DOE/Office of Nuclear Physics with significant funds from NSF • Key NSF contribution on Trigger Paul Reimer E906 Sepctrometer Upgrade Overview

  14. Spectrometer Upgrade Gantt Paul Reimer E906 Sepctrometer Upgrade Overview

  15. Spectrometer Upgrade (cont.) Paul Reimer E906 Sepctrometer Upgrade Overview

  16. Contingency • Overall contingency ¼20% • Very standard techniques • Considered based on each WBS item, but held in common • Technical—Existing design () Completely new design • Construction—Standard Techniques () New techniques/materials Relatively standard techniques for all items • Schedule—Subsystem only () Critical Path Schedule had minimal impact on contingency since delays were built into schedule. • Additional contingency from outside factors (e.g. fluctuation of base aluminum conductor price, hydrocarbon price in scintillator) Paul Reimer E906 Sepctrometer Upgrade Overview

  17. NM4 (KTeV) Meson West Location Fermilab Original • Meson East now used as Superconducting Cryo-Module Test Facility (SCMTF) Alternatives • Meson West • Vertical bend spectro.—bends + into earth. • 2nd magnet (SM3) must be assembled (but is available) • NM4 (KTeV) • Beam lime below grade allows a horizontal bending spectrometer—bends + and - into earth • 2nd magnet (KTeV) in hall • Nicer facility for physicists • Either location is acceptable to the collaboration • Fermilab is considering the impact of the experiment at both locations • In these talks, a vertical bend is assumed for historic reasons (i.e. E866/NuSea was that way) Paul Reimer E906 Sepctrometer Upgrade Overview

  18. Impact of E906 on Fermilab • Proton Impact: • 5 s slow extraction of 2£1012 protons/s each minute (possible scheme) delivers requested protons within 2 yrs • Approx. 10% impact on neutrino production • Major Cost Drivers: • Beam Line • Cryogenics for liquid 1H and 2H targets • Assembly of Analysis Magnets • Lesser (but still significant) Items: • Detector Gas System • Electrical and Water Utilities for Magnets • Shielding • Magnetic Field Mapping Equipment • Utilities for electronics • Area Preparation Paul Reimer E906 Sepctrometer Upgrade Overview

  19. Summary of Overview • Experimental approach has been proven by previous Drell-Yan experiments (E866, E789, E772). • E906 Expects higher rates, but appropriate modifications (e.g. Station 1 MWPC, double ended readout, trigger upgrade) have been made • M1 Magnet is the major construction cost driver on the part of DOE/Nuclear Physics • Economical reuse of SM12 yoke • Design underway w/budgetary estimates • Spectrometer upgrade requires only very conventional techniques • No technological show stoppers—uses well proven technology • Requires commitment from DOE/NP, Fermilab (DOE/HEP), NSF • Realistic schedule could start data collection in 2 ½ years Paul Reimer E906 Sepctrometer Upgrade Overview

  20. Drell-Yan Acceptance • Programmable trigger removes likely J/ events • Transverse momentum acceptance to above 2 GeV • Spectrometer could also be used for J/, 0 studies Paul Reimer E906 Sepctrometer Upgrade Overview

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