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E906 Changes. Spectrometer Location Spectrometer’s 2 nd magnet Hodoscopes Scintillator for Station 1 and 2 Photomultiplier tubes DAQ/Trigger. Paul E. Reimer 8 December 2006. Location Fermilab. Original Meson East is now not Available Superconducting Cryo-Module Test Facility (SCMTF).

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e906 changes

E906 Changes

  • Spectrometer Location
  • Spectrometer’s 2nd magnet
  • Hodoscopes
    • Scintillator for Station 1 and 2
    • Photomultiplier tubes
  • DAQ/Trigger

Paul E. Reimer

8 December 2006

location fermilab
Location Fermilab

Original

  • Meson East is now not Available
  • Superconducting Cryo-Module Test Facility (SCMTF)

E906 Changes since Inception

location fermilab cont

NM4 (KTeV)

Meson West

Location Fermilab (cont)

E906 Changes since Inception

location fermilab1
Location Fermilab
  • NM4 (KTeV)
    • Beam lime below grade allows for a horizontal bending spectrometer—bends + and - into earth. Easier assembly for magnets.
    • Possibility to use KTeV Magnet
    • Nicer facility for physicists
  • Meson West
    • Vertical bend spectro.—bends + into earth.
    • 2nd magnet (SM3) must be assembled (but is available)

E906 Changes since Inception

beam request and structure
Beam Request and Structure
  • Old Plan was for 1 £ 1012 protons/s and accumulate 5.3 £ 1018 protons on target in 1 year
    • Unacceptable impact on other Fermilab proton users
  • New Plan
    • Cut impact on other proton users by ¼
    • 2 £ 1012 protons/s
    • 5 s long slow extraction spill
    • Total of 5.3 £ 1018 protons in 2 years (with some allowance for normal Fermilab maintenance shutdowns, etc

E906 Changes since Inception

m1 magnet
M1 Magnet
  • New coils
  • Reuse whole pieces of SM12 magnet yoke (SM12 was the 14.4 m dipole used by E866)

E906 Changes since Inception

2 nd spectrometer magnet
2nd Spectrometer Magnet
  • Originally proposed Jolly Green Giant, 1.65 T-m (500 MeV pT) 80 £ 50 in.
    • In use by E907/MIPP (although their future is uncertain)
    • Possibly in need of repairs
  • Other magnets have become available:
    • SM3 (BTeV is no longer with us)

3 T-m, (900 MeV pT) 60 £ 60 £ 210 inches

    • KTeV Magnet (CKM and KAMI are no longer with us)

¼2 T-m, (600 MeV pT ) 2m £ 2m £ 200 inches

  • Impact on measurements (Monte Carlo from ACU students):
    • Momentum (and hence M and xF) resolution dominated by multiple scattering and energy loss in absorber until pT kick < 200 MeV
    • Acceptance also approximately the same for pT kick of 900 to 400 MeV
  • Plan:
    • MWest—Fermilab reassembles SM3
    • NM4 (KTeV) relocate KTeV magnet to appropriate position

E906 Changes since Inception

scintillator for hodoscopes station 1 and 2
Scintillator for Hodoscopes: Station 1 and 2
  • Original plan was to purchase new material for all stations
  • Current plan:
    • Purchase new material for Stations 3Y, 4Xa, 4Xb, 4Y (Abilene)
    • Recover material for Stations 1X, 1Y, 2X, 2Y from HERMES muon hodoscopes which will have to be refashioned and polished in one dimension. (Naomi Makins, Illinois)
    • Purchase new light guide material for all stations.

E906 Changes since Inception

photomultiplier tubes for double ended readout
Photomultiplier Tubes for Double Ended Readout
  • Original plan was to purchase ¼ 220 new 2” PMT’s to add double ended readout to Station 3 and 4 Hodoscopes, in addition to reusing E866 PMT’s
  • Current plan:
    • Recover 250 1.5” PMT’s/bases/shields from ZEUS at DESY (Argonne’s HEP) rather than new purchase (more could be available)
    • Cockroft Walton PMT bases with power supply
    • Need to test PMT’s, both ZEUS and old E866

E906 Changes since Inception

slide10
DAQ
  • Old plan was to borrow Fermilab E871 DAQ running Fermilab DART system
    • Still available to us (I verified this in November)
    • Do we really want the DAQ running on 10 yr old hardware?
    • DART is no longer supported at Fermilab; although, there is no operational, Fermilab-supported system appropriate for E906
  • Solution:
    • JLab CODA system
    • Need to implement Nevis bus readout
    • Need to implement FERA readout
  • Either solution will need local (collaboration) expert(s)

E906 Changes since Inception

trigger
Trigger
  • Old Plan was to Implement in copies of LeCroy Logic Units
    • Units no longer available
    • Expensive to duplicate units
    • Technology has evolved
  • New plan (Rutgers, Ron Gilman)
    • Implement in FPGA
    • Much cheaper, more flexible logic

E906 Changes since Inception

bottom line
Bottom Line
  • E906 has changed in terms of implementation
  • Physics goals have not changed and will be reached with new configuration
  • Hope to start construction in 2007 and start taking data in summer 2009

E906 Changes since Inception