Andrew Brandt FPD Rio Workshop Mar 29-30 2004 1

Forward Proton Detector OverviewForward Proton Detector Overview

Andrew Brandt

University of Texas at Arlington

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 2

•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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 3

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 4

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 5

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 6

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 7

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!

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 11

(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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 12

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 13

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 14

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 15

MZ all

MZ gap

Tagged Z event in FPD

Event Display

gapmuons

Run II Diffractive Z → µµRun II Diffractive Z → µµ

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 16

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

Andrew Brandt FPD Rio Workshop Mar 29-30 2004 18

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