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Forward Proton Detector Update

Forward Proton Detector Update. p. p. 9 momentum spectrometers comprised of 18 Roman Pots Scintillating fiber detectors can be brought close (~6 mm) to the beam to track scattered protons and anti-protons Reconstructed track is used to calculate momentum fraction and scattering angle

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Forward Proton Detector Update

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  1. Forward Proton Detector Update p p • 9 momentum spectrometers comprised of 18 Roman Pots • Scintillating fiber detectors can be brought close (~6 mm) to the beam to track scattered protons and anti-protons • Reconstructed track is used to calculate momentum fraction and scattering angle • Much better resolution than available with gaps alone • Cover a t region (0 < t < 3.0 GeV2) never before explored at Tevatron energies • Allows combination of tracks with high-pT scattering in the central detector P1U P2O Andrew Brandt, UTA Q4 Q3 Q2 Q2 S D Q3 Q4 S A1 D1 A2 D2 P1D P2I Veto 57 59 23 0 33 23 33 Z(m)

  2. UTA FPD Personnel/Resources Andrew Brandt (UTA): FPD L3 Manager Fermilab-based: Michael Strang (UTA GRA): detector construction, data analysis Daniel Mendoza (UTA EE): readout and trigger commissioning No longer employed by UTA: Deepak Shivashankar (UTA ME GRA): detector cons. (-1/03) Sahil Aggarwal (UTA UG): detector cons. (-1/03) Carlos Avila (UTA/Los Andes): trigger integration, DAQ (6/02-12/02,6/03-8/03) Victor Bodyagin (UTA/Moscow State): DAQ, electronics,database (10/01-1/03) Ricardo Ramirez (UTA/Stonybrook EE): trigger, firmware (4/02-8/03+consulting) Funding DOE OJI ($80k), Texas ARP (ends 12/03), New NSF MRI (NIU+UTA $125,000, equipment+GRA for 2 years)

  3. DØ Run II Diffractive Topics E   Soft Diffraction and Elastic Scattering: Inclusive Single Diffraction Elastic scattering (t dependence) Total Cross Section Centauro Search Inclusive double pomeron Search for glueballs/exotics Hard Diffraction: Diffractive jet Diffractive b,c ,t , Higgs Diffractive W/Z Diffractive photon Other hard diffractive topics Double Pomeron + jets Other Hard Double Pomeron topics Rapidity Gaps: Central gaps+jets Double pomeron with gaps Gap tags vs. proton tags Topics in RED were studied with gaps only in Run I <100 W boson events in Run I, >1000 tagged events expected in Run II

  4. Castle Status • All 6 castles with 18 Roman pots comprising the FPD were constructed in Brazil, installed in the Tevatron in fall of 2000, and have been functioning as designed. A2 Quadrupole castle installed in the beam line.

  5. Acceptance x Quadrupole ( p or ) 450 400 350 280 200 MX(GeV) Geometric (f) Acceptance x Dipole ( only) GeV2 450 400 350 20 200 MX(GeV) GeV2 Dipole acceptance better at low |t|, large x Cross section dominated by low |t| Combination of Q+D gives double tagged events, elastics, better alignment, complementary acceptance

  6. FPD Detector Design • 6 planes per detector in 3 frames and a trigger scintillator • U and V at 45 degrees to X, 90 degrees to each other • U and V planes have 20 fibers, X planes have 16 fibers • Planes in a frame offset by ~2/3 fiber • Each channel filled with four fibers • 2 detectors in a spectrometer 17.39 mm V’ V Trigger X’ X U’ U 17.39 mm 1 mm 0.8 mm 3.2 mm

  7. Detector Construction At the University of Texas, Arlington (UTA), scintillating and optical fibers were spliced and inserted into the detector frames. The cartridge bottom containing the detector is installed in the Roman pot and then the cartridge top with PMT’s is attached.

  8. Detector Status • 20 detectors built over a 2+ year period at UTA. • In 2001-2002, 10 of the 18 Roman pots were instrumented with detectors. • Funds to add detectors to the remainder of the pots have recently been obtained • from NSF (mostly for MAPMT’s). • During the shutdown • (Sep-Nov. 2003), the final eight • detectors and associated readout • electronics were installed. A2 Quadrupole castle with all four detectors installed

  9. Pot Motion Software Pot motion is controlled by an FPD shifter in the DØ Control Room via a Python program that uses the DØ online system to send commands to the step motors in the tunnel. The software is reliable and has been tested extensively. It has many safeguards to protect against accidental insertion of the pots into the beam.

  10. Operations • Currently FPD expert shifters inserting pots and Captains removing pots and setting system to standby • Pots inserted every store • Commissioning integrated FPD • Have some dedicated diffractive triggers, more when Trigger Manager operational • Combine shifts with CFT, since similar readout system • Working towards automated pot insertion (CAP)

  11. FPD Trigger and Readout

  12. FPD Readout Front View of PW08 (11/10/03)

  13. TPP (Transition Patch Panel) • Interface to connect flat ribbon cables to AFE flex cables. • Decouples tunnel and platform grounds. • Discards extra charge to work within dynamic range of AFE. • Mimics shape of VLPC signals.

  14. Resolution of Noise problem Old board- 1 cable attached • Large rms pedestsal values with TPP/AFE setup (not seen in test stand) • Traced to a capacitive coupling between grounds • Isolating one of the grounding planes fixes the problem • Required redesign, very tight schedule; new board also has optimized dynamic range S/N=7 10.0 4.0 New board- 1 cable attached

  15. New TPP/AFE Pedestals

  16. Fall Shutdown Work Primary Goals:Installation of final 8 detectors and full readout system (new TPP and AFE boards)Tunnel:1) ***Installation and testing of final 8 detectors2) ***Pot motion tests 3) New 12V LVPS installation 4) Amp/shaper tests+repairs for new detectors5) LVDT tests6) Radiaton shielding ; Camera+light work 8) Extension cord work for ORC9) TLDs installedCollision Hall:1) ***Installation and testing of new TPP boards and AFE's2) Cable repairs 3) HV for final detectors4) DFE installationControl Room/Fixed Counting house:1) Automatic pot insertion tests2) Uncabling small control room 3) FPD_LM commissioning in progress4) ACnet+rate watcher mods5) Pots in/out dispaly switch 6) TM commissioning XLab 31) ***Detector assembly

  17. FPD Integration Status • Full 18 detector system in readout. • Software in place and tested, FPD included in all DØ events. • FPD_LM TDC boards installed, being commissioned by Manchester; Vertex board for triggering still a few months away. • DFE boards complete, firmware has been implemented and is being tested. Thresholds to be tuned with new AFE/TPP setup. • Trigger manager commissioning in progress, first triggers using DFE within a couple months. • NIM/CAMAC trigger still in place for special runs.

  18. FPD Milestones

  19. Summary and Future Plans • Full 18 pot FPD will start taking data after shutdown (12/03) • Still work to do on detector and trigger commissioning • Manpower at Fermilab is the key issue

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