Forward Proton Detector UpdateForward Proton Detector Update

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

D SQ2Q3Q4S A1A2

P1U

P2I

P2O

P1D

p p

Z(m)

D2 D1

233359 3323057

VetoQ4Q3

Q2

Andrew Brandt, UTA

UTA FPD Personnel/ResourcesUTA FPD Personnel/Resources

Andrew Brandt (UTA): FPD L3 Manager

Fermilab-based:Michael Strang (UTA GRA): detector construction, data analysisDaniel 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)

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, >1000tagged events expected in Run II

DØ Run II Diffractive TopicsDØ Run II Diffractive Topics

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.

Castle StatusCastle Status

AcceptanceAcceptance

Quadrupole ( p or )p

Dipole ( only)p

MX (G

eV)

450

400

350

280

200

GeV2

GeV2

450

400

350

20

200

MX (G

eV)

Geo

met

ric

A

ccep

tan

ce Dipole acceptance better at low |t|, large Cross section dominated by low |t| Combination of Q+D gives doubletagged events, elastics, better alignment, complementary acceptance

FPD Detector DesignFPD 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

0.8 mm

3.2 mm

1 mm

17

.39 m

m

17.39 mm

UU’

XX’

VV’

Trigger

Detector ConstructionDetector ConstructionAt 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.

• 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 allfour detectors installed

Detector StatusDetector Status

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.

Pot Motion SoftwarePot Motion Software

• 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)

OperationsOperations

FPD Trigger and ReadoutFPD Trigger and Readout

Front View of PW08 (11/10/03)

FPD ReadoutFPD Readout

1. Interface to connect flat ribbon cables to AFE flex cables.

2. Decouples tunnel and platform grounds.

3. Discards extra charge to work within dynamic range of AFE.

4. Mimics shape of VLPC signals.

TPP (Transition Patch Panel)TPP (Transition Patch Panel)

Resolution of Noise problemResolution of Noise problem

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

Old board- 1 cable attached

New board- 1 cable attached

4.0

10.0

New TPP/AFE PedestalsNew TPP/AFE Pedestals

Fall Shutdown WorkFall Shutdown WorkPrimary 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 installed

Collision Hall:1) ***Installation and testing of new TPP boards and AFE's2) Cable repairs 3) HV for final detectors4) DFE installation

Control 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 X

Lab 31) ***Detector assembly

1. Full 18 detector system in readout.

2. Software in place and tested, FPD included in all DØ events.

3. FPD_LM TDC boards installed, being commissioned by Manchester; Vertex board for triggering still a few months away.

4. DFE boards complete, firmware has been implemented and is being tested. Thresholds to be tuned with new AFE/TPP setup.

5. Trigger manager commissioning in progress, first triggers using DFE within a couple months.

6. NIM/CAMAC trigger still in place for special runs.

FPD Integration StatusFPD Integration Status

FPD MilestonesFPD Milestones

Summary and Future PlansSummary 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