Status of
Eric Kajfasz
CPPM/Fermilab
GDR-Susy, Lyon - 26 novembre 2001
The D0 detector
Short history of RunII so far ...
Dates in 2001
Action
January 26
Roll DØ detector into collision hall
March 1
Close complex; ready for beam; Run 2 officially starts
April 3
First collisions in Tevatron
Accumulate luminosity; complete detector; time in; improve electronics, DAQ and
offline systems
Take data with intermittent shutdowns
October 8
Start 7 week shutdown.
DØ: install fiber tracker electronics ( main effort)
~ November 26
Continue data taking
Run 2, the
big picture:
2a: a multi year run with integrated lum goal fb-1
Shutdown ~ 2004 replace silicon detector
2b: a multi year run with integrated lum goal fb-1
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
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 vs. Y
X, Y vs. Z
Moved
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

IP
signif.
Plot
impact
parameter
significance
for these
tracks
First hint of an impact parameter signal from B’s
Very encouraging!
Central Fiber Tracker
8 layers of axial and
stereo 800um fibers
94 boards installed
(74 axial/12 stereo)
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%)
Trig. sum
Calibration
electronics
readout
chain
Calorimeter
Bank 0
SCA (48 deep)
Preamp/
Driver
Filter/
Shaper
x1
x8
SCA (48 deep)
BLS
SCA (48 deep)
SCA (48 deep)
Bank 1
SCA
Output
Buffer
Calorimeter Performances
SCA-behavior: pedestal
measurement over all
channels of 1 chip –
spread ~1ADC count
L1 SCA up
Timing Studies:
using triple
sampling runs
all crates timed
in at ~10ns
early/
nom.
L1 SCA down
pulser ADCreadout
=0.69
late/
nom.
L2 SCA
Energy Scale:
estimation from
electronic calibration
absolute scale verified
at 10%
=0.77
pulser shaper
output
Calorimeter: W/Z events
Z ee candidate
2 EM objects, ET > 20 GeV,
isolation and shower shape cuts
We candidate
EM cluster
with track
DØ
m(e,e)
L~0.7pb1
DØ
mT(e,)
L~0.7pb-1
MZ
un-calibrated
energies
invariant mass (GeV)
un-calibrated
energies
transverse mass (GeV)
Calorimeter: jet events
-jet event
2-jet event
ET=27 GeV
em-fraction 0.9
ETjet1~230 GeV, ETjet2~190GeV
Etjet=24GeV
em-fraction 0.5
DØ
Jet pT Distribution
Run I- jet
DØ
0.7 cone
corrections
Muon System
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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
System
Status Oct 8
Status Dec 1
Completion
date
In: 2.5Mhz
CAL: 50%
Muon: 50%
Track: 0%
CAL: 100%
Muon: 100%
Track: 100%
Dec 2001
0% due to a
processor problems
Cal & Muon
working
Feb 2002
In: 80 Hz
Use emulators; final
hardware not ready;
CAL filters
In: 500Hz
Cal & Muon
filters; others
starting
1kHz in
~March 2002
L1
Out:5-10kHz
In:5-10kHz
L2
Out:~1kHz
In:~1 khz
L3/DAQ
Out:50 Hz
L3 calorimeter trigger
EM clusters, pT > 10 GeV
Isolated, EM fraction > 0.9
|| < 1.1
Jets, pT > 15 GeV
R = 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