Status of

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Status of

• Eric Kajfasz
• CPPM/Fermilab
• GDR-Susy, Lyon - 26 novembre 2001

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The D0 detector
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Short history of RunII so far ...
Run 2, the big picture
Shutdown 2004
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L0 Trigger and Luminosity Monitor
Level 0 trigger luminosity counters
August 1 ? Oct 7
Delivered 9.5 pb-1 Exposed 6.8pb-1 use for
all data taking ( commissioning tests
physics) Global 3.5pb-1 for global physics runs
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Silicon Tracker
real life
6 barrels 12 F disks 4 H disks
800K channels completed hook up by May 2001 ?
85 live channels
After November shutdown ? About 95 live channels
Results from SMT tracking only measure
interaction vertex
X, Y vs. Z
X vs. Y
?Moved detector by 4 (X) and 5mm (Y)
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Silicon Tracker
Noise 1 to 2 counts
Cluster charge 25 counts/MIP
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Silicon Tracker
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Silicon Tracker - b tagging
IP signif.
First hint of an impact parameter signal from
Bs Very encouraging!
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Central Fiber Tracker
8 layers of axial and stereo 800um fibers
94 boards installed (74 axial/12 stereo)
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SMT - CFT alignment
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Calorimeter Electronics Upgrade

• 55k channel Ur/liq. Argon calorimeter
• Run II upgrade
• replacement of electronics to accommodate faster
  bunch crossings
• 55k dual FET PreAmps
• 23k Switch Capacitor Arrays (SCA) on
  1200 BaseLineSubtraction (BLS)-boards
• 50 bad channels (0.1)

Trig. sum
Bank 0
Calibration
SCA (48 deep)
electronics readout chain
SCA (48 deep)
x1
Filter/ Shaper
Output Buffer
Preamp/ Driver
BLS
SCA
x8
Calorimeter
SCA (48 deep)
SCA (48 deep)
Bank 1
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Calorimeter Performances
SCA-behavior pedestal measurement over all
channels of 1 chip spread 1ADC count
Timing Studies using triple sampling runs all
crates timed in at 10ns
Energy Scale estimation from electronic
calibration absolute scale verified at 10
ADC counts
L1 SCA up
pulser ADC-readout
L1 SCA down
pulser shaper output
L2 SCA
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Calorimeter W/Z events
Z ?ee candidate 2 EM objects, ET gt 20
GeV, isolation and shower shape cuts
m(e,e) L0.7pb-1
DØ
DØ
mT(e,n) L0.7pb-1
MZ
un-calibrated energies
un-calibrated energies
transverse mass (GeV)
invariant mass (GeV)
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Calorimeter jet events
?-jet event ET?27 GeV em-fraction 0.9
2-jet event ETjet1230 GeV, ETjet2190GeV
Etjet24GeV em-fraction 0.5
DØ
Run I- jet corrections
DØ
0.7 cone
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Muon System
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Inter Cryostat Detector

• multiple improvements during shutdown
• all tiles/phototubes installed
• ready for data taking

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Forward Proton Detector

• Installation in the tunnel and in the hall
  progressing well
• Continue commissioning

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Trigger and DAQ
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L3 calorimeter trigger
EM clusters, pT gt 10 GeV Isolated, EM fraction gt
0.9 ? lt 1.1
Jets, pT gt 15 GeV R 0.7 cone ? lt 1.1
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Outlook

• Pre-shutdown data analysis proves efficient
  operation of most detector sub-systems, including
  hardware and software
• Shutdown jobs were successful and accomplished on
  schedule
• AFE installation will continue during next 2
  months in parallel with Fiber Tracker and Fiber
  Trigger commissioning
• Starting post-shutdown operations with few dead
  channels in most systems, a new Linux L3 farm and
  improved DAQ system

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Outlook

• Have a well defined list of goals for operation
  during December-January to be ready for Spring
  Conferences
• Concentrate on global physics data taking
• Reasonably minimize amount of special runs
• Tevatron plan is to provide colliding beams
  starting late November
• No major shutdown planned until next summer
• Will start from the same luminosity as before the
  shutdown
• Ramp luminosity to 1-2x1031 in January
• 1 day of studies per week
• Longer term plan is to get luminosity of
  5-10x1031 by next summer
• Expect 400 pb-1 by the end of 2002

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Part of the future Silicon for RunIIb