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Status of
Eric Kajfasz
CPPM/Fermilab
GDR-Susy, Lyon - 26 novembre 2001
The D0 detector
Short history of RunII so far ...
Continue data taking~ November 26
Start 7 week shutdown.
DØ: install fiber tracker electronics ( main effort)
October 8
Accumulate luminosity; complete detector; time in; improve electronics, DAQ and offline systems
Take data with intermittent shutdowns
First collisions in TevatronApril 3
Close complex; ready for beam; Run 2 officially starts March 1
Roll DØ detector into collision hallJanuary 26
ActionDates in 2001
Run 2, the big picture:
2a: a multi year run with integrated lum goal fb-1
replace silicon detector2b: a multi year run with integrated lum goal fb-1
Shutdown ~ 2004
L0 Trigger and Luminosity Monitor
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
Level 0 trigger & luminosity counters
August 1 Oct 7:
Silicon Tracker
real life 6 barrels12 F disks4 H disks
800K channels; completed hook up by May 2001 85% live channelsAfter November shutdown About 95% live channels
Results from SMT tracking only: measure interaction vertex
X vs. Y X, Y vs. ZMoved detector by 4 (X) and 5mm (Y)
Silicon Tracker
Noise ~ 1 to 2 counts Cluster charge: ~25 counts/MIP
Silicon Tracker
Silicon Tracker - b tagging
Plot impactparametersignificancefor thesetracks
First hint of an impact parameter signal from B’sVery encouraging!
IPsignif.
Central Fiber Tracker
94 boards installed(74 axial/12 stereo)
8 layers of axial andstereo 800um fibers
SMT - CFT alignment
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%)
Preamp/Driver
Trig. sum
Filter/Shaper
x1
x8
SCA (48 deep)
SCA (48 deep)
SCA (48 deep)
SCA (48 deep)
BLSOutputBuffer
Bank 0
Bank 1
SCACalorimeter
Calibration
electronicsreadoutchain
Calorimeter Performances
SCA-behavior: pedestal measurement over all channels of 1 chip – spread ~1ADC count
AD
C c
ou
nts
late/nom.
early/nom.
=0.77
=0.69
Timing Studies: using triple sampling runs all crates timed in at ~10ns
Energy Scale: estimation from electronic calibration absolute scale verified at 10%
pulser shaper output
pulser ADC-readout
L1 SCA up
L1 SCA down
L2 SCA
Calorimeter: W/Z events
Z ee candidate2 EM objects, ET > 20 GeV,isolation and shower shape cuts
EM clusterwith track
We candidate
mT(e,)
L~0.7pb-1
m(e,e) L~0.7pb-
1
DØ
MZ
invariant mass (GeV) transverse mass (GeV)
DØ
un-calibrated energies
un-calibrated energies
Calorimeter: jet events
2-jet event ET
jet1~230 GeV, ETjet2~190GeV
Jet pT Distribution
-jet eventET
=27 GeVem-fraction 0.9
Etjet=24GeV
em-fraction 0.5
Run I- jet corrections
0.7 cone
DØ
DØ
Muon System
Title:
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Inter Cryostat Detector
• multiple improvements during shutdown
• all tiles/phototubes installed
• ready for data taking
Forward Proton Detector
• Installation in the tunnel and in the hall progressing well• Continue commissioning
Trigger and DAQ
Completion date
Status Dec 1Status Oct 8System
1kHz in ~March 2002
In: 500Hz
Cal & Muon filters; others starting
In: 80 Hz
Use emulators; final hardware not ready;
CAL filters
In:~1 khz
L3/DAQOut:50 Hz
Feb 2002Cal & Muon working
0% due to a processor problems
In:5-10kHz
L2Out:~1kHz
Dec 2001
CAL: 100%
Muon: 100%
Track: 100%
CAL: 50%
Muon: 50%
Track: 0%
In: 2.5Mhz
L1Out:5-10kHz
L3 calorimeter trigger
EM clusters, pT > 10 GeVIsolated, EM fraction > 0.9
|| < 1.1
Jets, pT > 15 GeVR = 0.7 cone
|| < 1.1
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
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
Part of the future: Silicon for RunIIb