Statut du détecteur et des projets PP LAL Orsay DØ France 8-9/11/04

Run II Delivered and Logged Luminosity Data Delivered: 0.59 fb-1 Data to Tape: 0.47 fb-1 Overall Efficiency: 80% Date used in Analyses: 0.44 fb-1

Silicon Microstrip Tracker 4 barrel layers axial + stereo strips Radiation dose and damage 3.6±1.8 fb-1 now Detector working very well! There is some concern over mortality % disabled ~17% barrel detectors inoperable

Scintillating Fiber Tracker Eight axial and eight stereo layers VLPC readout at 8K Performing well good light yield layer  > 98% After November 2003 shutdown ~ 1% of VLPC channels not functional was 0.1% before November a one-time event water contamination in cryostat? This shutdown warmed up 1 (of 2) cryostats (major shutdown activity #1) pumped out 0.5l H20 Upon cool down same loss rate BUT different channels Will not seriously degrade performance but is a worry.

Calorimeter Liquid argon calorimeter with uranium absorber 50k channels, 99+% Intermittent noise problems During shutdown restored platform isolation (major activity #2) Removed nearly 20 dead shorts - welding noise down four orders of mag. J/ and  from EM clusters

Muon System scintillator Efficiency: high (94%) & uniform  ±2  Three layers of scintillator planes for triggering, 99+% channels Three layers of drift tubes for muon track measurement, 99+% channels scintillator Efficiency: high (94%) & uniform  ±2 supports  shielding Stability

Forward Proton Detector Detector fully installed and operational Trigger commissioning underway Planning for full physics capability this winter

Statut du calorimètre Suivi de l’électronique FE - Preamp/BLS/ADC beaucoup de travail pendant le shutdown très peu de francais au charbon..et le “servics task ??” calo géré par nous ????? - programmes de suivi cal_elec (piedestaux/pulser) fit de la réponse des adc en fct du signal de calib (calib online) mais aide à debugger Chasse au bruit cohérent dq_calo et qualité des données bruit du à des machines extérieures bruit du à l’alim haute tension Calib online calibration de l’electronique et controle Calib offline utile pour comprendre la reponse du calo et ses defauts mecaniques ou autres..

PEDESTAL STABILITY Slava BEGINNING OF THE STORE END OF THE STORE FIT RESULTS: MEAN = 0.1 RMS = 0.4 FIT RESULTS: MEAN = 0.07 RMS = 0.4

RMS EM Layer 3 hadronic

“COHERENT NOISE” EVENTS GALLERY (EM layers, ADC counts, 1 “COHERENT NOISE” EVENTS GALLERY (EM layers, ADC counts, 1.5 zero suppression)

THE PROBLEM Slava 10% of the collected events (at 40•1030cm-2s-1) have 1 or more ADCs with occupancy in EM part more than 20% at RMS 5 counts OR 1 or more ADCs with occupancy more than 40% and RMS < 10 counts NUMBER OF ADC PER EVENT WITH OCCUPANCY MORE THAN 40% AND RMS < 10 COUNTS This “noise” is luminosity dependent 5.6% of noise lum ~ 41•1030 2.6% of noise lum ~ 10.5 • 1030 Target as “coherent noise ” with current criteria

10% of the collected events (at 40•1030cm-2s-1) have 1 or more ADCs with occupancy in EM part more than 20% at RMS 5 counts OR 1 or more ADCs with occupancy more than 40% and RMS < 10 counts The typical observed mean value near 10 counts (up to 20 counts) Can be subtracted following Slava’s criteria ADC occupancy > 20% and RMS < 10

Minos welding noise –08-05-04 Rings of fire at abs(eta) ~1.3 100% correlated with welding L3 Profile of the noise fraction in jet triggers “high frequency” “dc “ (less noisy)

welding noise Jet triggers 1- défaut de mise à la terre du transfo de soudage 2- encore des contacts entre la masse du détecteur et du hall Résolu détecteur fermé plus de bruit du à la machine a souder MAIS de retour avec le détecteur ouvert ….nouveaux tests 15/11/04

Phi module 17 Sergey/PP .. Aurélien/Smain .. Jan/Matt

Calibration Constants Vs Phi for Eta=-3 University of Maryland Jan/Matt 18

Clean Room Logbook Entry from Nov 7, 1989 After completely installing the CC Modules, while removing the support fixtures a “problem” was found. Deformed Note Sector number

End view of EM module End plate deformed and pushed on EM1 readout board EM4 Steel end plate EM3-4 EM3-3 EM3-2 EM3-1 EM2 EM1 bent here

Conclusion..provisoire Junjie la calo marche bien: ped stables bruit en amélioration (?) bonne équipe (CALOP) mais peu de français performances en dessous du Run I même avec la nouvelle calibration en phi largeur du Z ~2.8 GeV (due à la résolution)  C~3.8% ~< si sampling term = 20%/sqrt(E)

Upgrade

Clearance: 700 µ ! Couche Ø Same diameter as a golf ball

Trigger “sliding window” proto Saclay

Prévisions sur la luminosité Nov 04 à 2 10**32: - ~10 interactions/croisement dans le calo - ~ 100% occ dans la 1ère couche du CFT quelle physique après 2006 ?  proposal +50Hz