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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
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)


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)


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


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.


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


Fpd detector design
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


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.


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


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.


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)



FPD Readout

Front View of PW08 (11/10/03)


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.


Resolution of noise problem
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



Fall shutdown work
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


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.



Summary and future plans
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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