Forward Proton Detector Overview
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Transcript of Forward Proton Detector Overview
Andrew Brandt FPD Rio Workshop Mar 29-30 2004 1
Forward Proton Detector OverviewForward Proton Detector Overview
Andrew Brandt
University of Texas at Arlington
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•Bring FPD detector group, proton-ID, and physics group together, generate discussion
•Evaluate current status, problem areas, and issues
•Identify manpower shortages and attempt to address them
•Identify obstacles to producing physics results
•Develop plan for next six months
Workshop GoalsWorkshop Goals
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Forward Proton Detector LayoutForward Proton Detector Layout
9 momentum spectrometers composed 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 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
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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
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Diffractive Topics and Students!Diffractive Topics and Students!Student
Year
Institute Advisor Subject
Tamsin Edwards
2005
Manchester B. Cox Diffractive Z production using gaps
Ana Carolina de Jesus
2007
Rio A. Santoro Heavy Flavor production in diffraction
Helena Malbouisson
2007
Rio A. Santoro Diffractive dijet structure function
Luis Mendoza
2007
Bogotá C. Avila Diffractive W, Z
James Monk
2006
Manchester B. Cox Double Pomeron
Renata Rodrigues
2007
Rio A. Santoro Diffractive jets
(double Pomeron)
Michael Strang
2004?
UTA A. Brandt Diffractive jets tagged with FPD
New student, Roman Otec, working on diffractive jets
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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 (a vacuum leak was repaired1+ years ago) All castles were checked and underwent maintenance during Fall 2003 shutdown
A1 Quadrupole castle installed in the beam line.
Castle StatusCastle Status
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In 2001-2002, 10 of the 18 Roman pots were instrumented with detectors.
Funds to add detectors to the remainder of the pots was obtained from NSF (mostly for MAPMTs)
During the fall 2003 shutdown the final eight detectors and associated readout electronics were installed. Dark current was verified with detectors in place.
Shielding was installed because of high rates seen before shutdown
Low Voltage Power Supplies were upgraded, installed and tested under full load
A2 Quadrupole castle with allfour detectors installed
Detector StatusDetector Status
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FPD DAQ and TriggerFPD DAQ and Trigger
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Resolution of TPP Noise ProblemResolution of TPP Noise Problem
Transition Patch Panel is used to interface between ribbon cable carrying signal from the tunnel and flex cable for the AFE
Before Shutdown, we saw rms values near 20 (4 or 5 is typical for AFE board) traced to a capacitive coupling on the board
Redesigned and replaced all (18) boards during the fall 2003 shutdown After shutdown, rms values are near 4 or 5 This issue delayed integration and diverted manpower, but it’s
successful resolution allows us to proceed towards integrated physics
Andrew Brandt FPD Rio Workshop Mar 29-30 2004 10Front View of PW08 (11/10/03)
FPD ReadoutFPD Readout
Thanks Daniel!
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(0,0)
x
y
beam
D2 D1
D0
pbar
p halo
pbar halopbar
Standalone vs. AFE ReadoutStandalone vs. AFE Readout
Standalone Readout: particle passes through trigger scintillators
AFE readout Similar correlations Uses trigger:
– one jet with 25GeV and North luminosity counters not firing
This trigger suppresses the halo band
pbar
p halo
pbar halo
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Partial list of steps needed to get to physicsquality data:
• Commission AFE’s• Include trigger scintillator information/ basic and/or terms• Alignment of FPD• FPD database• Activate FPD_Reco• Halo understanding, reduction, and rejection• FPD info in DST’s and Thumbnails
2003 Steps Needed for Physics2003 Steps Needed for Physics
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2004 Issues (aka Kotcher List)2004 Issues (aka Kotcher List) Obtaining new elastic data sample LM+Trigger Commissioning Automatic pot insertion Halo/background reduction and modelling Detector studies, alignment, resolution, cross talk, efficiency Tracking alignment, acceptance, database, efficiency, lattice
uncertainty, MC L2+L3 Data handling and quality
Making sure a name and schedule associated with each task
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dN/dT Result of the weekdN/dT Result of the week
Tremendous work especially by the Jorge’s to finalize the preliminarydN/dT measurement. Congrats again to Dr. Molina for first FPD PhD!
http://www.fnal.gov/pub/today/archive_2004/today04-03-18.html
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MZ all
MZ gap
Tagged Z event in FPD
Event Display
gapmuons
Run II Diffractive Z → µµRun II Diffractive Z → µµ
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Fermilab+Operations Fermilab+Operations
Partially due to new funding initiative of Brazilian/Columbian visitors, we have dramatically increased Fermi presence, from low point of Mike, Tamsin, and Daniel, to now include Ana, Helena, Renata, Luis, Roman with Luiz Mundim to go out for one year (Lum), many trips just concluded and others to begin soon.
Mike will describe operations, highlights include 18 pots routinely inserted once/day, and very little to do during accesses
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• Data taking with integrated Phase I• Add FPD triggers to global list• Complete funding and implementation of Phase II• Preliminary results on several physics topics
2003+2004 Goals2003+2004 Goals
• Data taking with integrated Phase II• Add FPD triggers to global list• Published results on dN/dT and Z• Preliminary results on several physics topics including double pom
2003
2004
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SummarySummary
Early FPD stand-alone analysis shows that detectors work,
will result in elastic dN/dt publication (already 1 Ph.D.)
Full 18 pot FPD now integrated into DØ readout (detectors still work), LM + Trigger still lagging
Commissioning of detectors and trigger STILL in progress
Need responsibility taken for every task (not just a name in a box)
Looking forward to an exciting and productive workshop