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

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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