1. FPD Status and Plans Andrew Brandt UTA Q4 D S Q3S A1A2 P 1 UP p p Z(m) D1 Detector Bellows Roman Pot 233359 33230 57 P 2 OUT Q2 P 1 DN P 2 IN D2 Q4Q3Q2 March 22, 2002 All-D0 Meeting Fermilab

2. Diffraction Thesis Topics 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 Diffractive W/Z Diffractive photon Diffractive top Diffractive Higgs Other hard diffractive topics Double Pomeron + jets Other Hard Double Pomeron topics Rapidity Gaps: Central gaps+jets Gap tags vs. proton tags Double pomeron with gaps   E 1000 tagged events in Run II

3. 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. Quadrupole castle A2 installed in the beam line. Castle Status

4. 4 fiber bundle fits well the pixel size of H6568 16 Ch. MAPMT (Multi- Anode Photomultiplier Tube) 7 PMT’s/detector 16 250  m fibers each PMT Six planes (u,u’,x,x’,v,v’) of 800  m scintillating fibers (’) planes offset by 2/3 fiber 20 channels/plane(U,V)(’) 16 channels/plane(X,X’) 112 channels/detector 18 detectors 2016 total channels 4 fibers/channel 8064 fibers 1 250  m LMB fiber/channel 8 LMB fibers / bundle 252 LMB bundles 80  m theoretical resolution Detector Setup

5. At the University of Texas, Arlington (UTA), scintillating and optical fibers were spliced and inserted into the detector frames. Detector Assembly

6. Detector Mapping After the detectors were assembled and polished, an optical scanner was used to map the exact location and width of the fibers in the frames to improved detector calibration.

7. The plastic frames containing the clear fibers are attached to the cartridge bottom. Detectors in Cartridges The cartridge bottom containing the detector is installed in the Roman pot and then the cartridge top with PMT’s is attached.

8. All 18 cartridges have been assembled, 10 are installed in tunnel (8 with full detectors 2 with trigger scint). The 10 instrumented pots (Phase I) are ups, downs, and dipoles. Cables and tunnel electronics (low voltage, amp/shapers, etc.) installed and operational for full 18 pot (Phase II) setup. 6 more detectors are complete except for final polishing, last 6 finished by summer. Tunnel and Detector Status

9. In the October shutdown four veto counters each of which cover 5.2 < |  | < 5.9 were installed between DØ and the first low beta quadrupole (Q4), about 6 m from the interaction point. The counters, two each on the outgoing proton and anti-proton arms, can be used in Diffractive triggering (veto proton remnant). Veto Counters

10. Pot Motion 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.

11. Pot Motion Safeguards The software is reliable and has been tested extensively. It has many safeguards to protect against accidental insertion of the pots into the beam. The drivers are disabled with a switch in the Control Room when the pots are not being moved. The pots are hooked to an emergency line which bypasses the software to send the pots back to the home position in case of emergency (tested but not used).

12. Pot Insertion Monitor Effect of the pot motion on the proton and antiproton losses at DØ and CDF is monitored using ACNET. Current agreement with Beams Division and CDF requires that the effect on halo rates is less than 20%.

13. FPD Readout and Trigger

14. We are working on commissioning the standard Run II DAQ. The most recent progress was the design, construction and installation of the Transition Patch Panel and combs. Standard DAQ The TPP converts from 16-channel ribbon cables to 64 channel flex cables, isolates detector ground, mimics signal of VLPC’s, and discards extra charge.

15. Stand-alone DAQ Due to delays in DØ trigger electronics, we have maintained our stand-alone DAQ first used in the fall 2000 engineering run. We build the trigger with NIM logic using signals given by our trigger PMT’s, veto counters, DØ clock, and the luminosity monitor. If the event satisfies the trigger requirements, the CAMAC module will process the signal given by the MAPMT’s. With this configuration we can read the fiber information of only two detectors (currently PD spectrometer is read out), although all the trigger scintillators are available for triggering. An elastic trigger is formed from coincidences of the PU+AD spectrometers combined with halo vetoes (early time hits) and vetoes on LM and Veto counters.

16. FPD Control Room

17. ADC Distributions Spectra for plane U in the detector P2D for a sample of events from an elastic run

18. Hit Fiber Distribution for PD1 Detector

19. Event Display P1D P2D beam x1 xp16 v1 vp20 up1 u20 X –view (above)Y - view x1

20. Elastic  Distribution (raw)  =  p/p should peak at 0 for elastic events!! Require clean events with 0 or 1 hit per plane for initial studies

21. MC Elastic x,y Correlations PD1x vs. PD2x (mm) PD1y vs. PD2y (mm) Actual x,y values without detector simulation x,y values after conversion to fibers and vertex smearing

22. Data Elastic x,y Correlations PD1x vs. PD2x (mm) PD1y vs. PD2y (mm) Good correlation between x1,x2 and y1,y2 in data but shifted from MC expectation (3 mm in x and 1 mm in y)

23. Elastic ,t (calibrated) Minimum t about 1.0 Gev 2  peak reasonably Gaussian, still 2x ideal MC resolution Calibrated  now peaks at 0

24. Integration of FPD into DØ 4/15/02 Tests of TPP/AFE at AFE test stand 4/30/02 Installation of full readout chain for one spectrometer (requires one AFE board) 5/31/02 Installation of readout chain for Phase I (10 detectors/5 spectrometers) 6/30/02 Installation of trigger chain for Phase I 8/31/02 FPD triggers in DØ global list In parallel: 4/15/02 Rapidity gap+jet triggers added to DØ global list 4/15/02 Enable FPD scintillator trigger AND/OR terms 4/30/02 FPD sDAQ

25. Proton ID The Proton ID group led by Gilvan Alves and Sergio Novaes has made substantial progress in many software areas: Track reconstruction Monte Carlo Unpacking Single Interaction Tool Alignment Database Regular Proton-ID meetings are held off-week Thursdays 11-12:30 in Black Hole using VRVS

26. Plans Take more elastic (and diffractive) data with stand- alone DAQ in current configuration. Switch spectrometers and take more data. Continue data analysis and proton certification. Continue integration efforts, firmware and trigger development in parallel. In June (?) shutdown install multiplexor, allows 18 pot control, more diagnostics, requires fewer rack monitors (coupled with new pot motion software release).

27. Tremendous progress in installation and commissioning Entering a new FPD era: Installation of Phase I complete Emphasis on software, operations, and data analysis Trigger hardware and firmware still a major concern Starting to think about physics a little! Conclusions