E906 changes
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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

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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


E906 changes

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


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