FPD Status and Data Quality Andrew Brandt

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FPD Status and Data Quality Andrew Brandt UTA
DØ Workshop June 17, 2003 Beaune, France
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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. A2U pot had vacuum leak
  and was disabled for 6 months and fixed during
  Jan. 2003 shutdown.

A2 Quadrupole castle installed in the beam line.
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FPD Detector

• 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
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Tunnel and Detector Status

• All 18 cartridges have been assembled, 16 are
  installed in tunnel (10 with full detectors 6
  with scintillator only). The 10 instrumented
  pots (Phase I) are ups, downs, and dipoles.
• Cables and tunnel electronics (low voltage,
  amp/shapers, etc.) installed and completely
  operational for Phase I,
• mostly operational for Phase II
• 18 pot setup (NSF MRI submitted
• by NIUUTA to obtain remaining
• funds).
• 10 more detectors (includes 2
• spares) are complete except for
• final polishing, which is in
• progress at Fermilab.

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Veto Counters
In the October 2001 shutdown four veto counters
(designed at UTA, built at Fermilab) each of
which cover 5.2 lt ? lt 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).
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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.
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FPD Trigger and Readout
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FPD Integration
Substantial, if not speedy, progress (stand-alone
DAQ in parallel)

• I) AFE
• Added FPD AFEs, Sequencer, and VRB to CFT
  database
• Modified sequencer for FPD timing
• Modified AFE firmware for FPD timing
• Built and extensively tested transition board
  (TPP) between
• detector cables and flex cables
• Overcame several installation difficulties
• Updated FPD AFE packing code
• Created FPD examine
• 2 Boards installed, commissioning in progress
• II) DFE
• Boards in hand
• Trigger equation firmware being tested in
  combined test stand
• III) LM electronics to read out trigger
  scintillator
• and for FPD trigger
• IV) TM
• 1) Components installed, cables laid,
  commissioning ready to begin

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Elastic Data
In-time hits in AU-PD detectors, no early time
hits, or LM or veto counter hits

• Approximately 3 million elastic triggers
  taken with stand-alone DAQ
• About 1 (30,000) pass multiplicity cuts
• Multiplicity cuts used for ease of reconstruction
  and to remove halo spray background

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Elastic Data Distributions

• After alignment correction,
• x peaks at 0 (as expected
• for elastics) MC x
• resolution is 0.013
• (including z smearing and
• dead channels), data is
• 0.015, 1.15 times larger
• The t distribution has a
• minimum of 0.8 GeV2 tmin
• is determined by how close
• the pots are from the beam,
• shape is in rough
• agreement with expected
• angular acceptance from
• MC.

Before alignment
After alignment
Gaussian fit
t distribution
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Dipole Data Timing

• Can see bunch structure of both proton and
  antiproton beam
• Can reject proton halo at dipoles using TDC
  timing
• CDF does not have this
• capability (neither do
• we until LM Run II
• electronics operational!)

pbar
D2 TDC
p
DØ Preliminary
D1 TDC
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FPD Operations

• Continue with FPD expert shifters inserting pots
  and Captains removing pots and setting system to
  standby
• Pots inserted almost every store
• Commissioning integrated FPD
• Soon will add new AND/OR terms and FPD triggers
• Will combine shifts with CFT when routine data
  taking begins
• Working towards automated pot insertion (CAP)

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Software Status

• Monte Carlo Tools
• MC for Diffractive Physics (POMPYT, POMWIG,
  SCIPYT) released
• FPD is fully integrated in DØgStar
• FPD geometry beamline in DØgStar DØSim ?
  FPDDigiChunk
• L3 Tools
• Tracking released
• Unpacking released
• Single Interaction Tool released
• Not tested on raw data
• Offline Tools
• Unpacking released and tested on raw data
• Implementing multihits environment in the
  tracking algorithm
• FPD_Reco released. Needs raw data testing
• Geometry pre-release version

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FPD Runs Database
Goal access information about FPD experimental
setup and accelerator conditions which
is available through EPICS during
reconstruction analysis of data
In progress
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Missing Software

• Integration of FPD_Reco into DØReco
• Trigger Simulator Raw Data
• L3 Geometry Offline
• DST TMB Info DØReco
• FPD_Analyze Offline (DSTTMB)
• Alignment Tool (offline) Elastic stream
• Calibration Tool (offline) LMB Data

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Getting to the Physics

• Partial list of steps needed to get to physics
• quality data
• Commission AFEs
• Refine FPD_Examine
• Include trigger scintillator information/
• basic AND/OR terms
• Alignment of FPD
• Finalize FPD database
• Activate FPD_Reco
• Halo understanding, reduction, and rejection
• FPD info in DSTs and Thumbnails

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Operating position determined by halo either
10 affect on DØ halo, or rates in our pots gt180
khz. Beams Division simulations indicated 8-9?
feasible.Reality 50-100 times worse, due to
neglected single pass halo generation term
10? or worse Effects1)
acceptance for quad spectrometers drops by
x3/beam ? !)2) radiation damage (lt10 gain loss
in 5 years to gt 50 depending on
extrapolation)3) variable halo rates makes
automatic pot insertion more difficult.Studies
of home rates vs p-halo (D0PHTL) and A-halo
(D0AHTL) show that 35 kHz and 2.5 kHz
respectively give tolerable rates (routinely
exceeded)Working with BD on detailed plan for
halo study and rejection
Halo
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Summary and Plans

• Early FPD stand-alone analysis shows that
  detectors work
• FPD is now integrated into DØ readout, but
  detector commissioning and trigger still in
  progress
• Goals for 2003
• 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
• New (wo)manpower would not be
  turned away!