24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

1

Data Taking StatisticsWeek of 2003 March 17-23

• Corrections to Physics Luminosity & Events to Tape– Special Runs: QCD Jet Gap Trigger Study

• Recorded 67 nb-1 & 221k of non-Physics events

• Physics: Recorded Lumi = 4.9 pb-1 or 81.4% of Del. Lumi

Recorded 9.2 million Physics Quality Events • Compared to best performance: Week of 2002 Dec 30-

2003 Jan 5 5.6 pb-1 and 14.5 million events

Normalizable Luminosity (pb-1) Hours Norm. Events (k) Efficiency

Day Date Del Util Rec Physics Store Util Rec Rec Physics Rec Phys

Mon 17-Mar-03 1337.21 1214.97 914.79 914.79 18.3 17.0 14.6 1573 1573 0.684 0.684Tue 18-Mar-03 1041.99 1017.93 956.94 956.94 11.5 11.3 11.1 1459 1459 0.918 0.918Wed 19-Mar-03 1254.79 1247.39 1157.13 1157.13 16.9 16.8 16.4 2419 2419 0.922 0.922Thu 20-Mar-03 1373.48 1332.90 1175.82 1175.82 15.2 14.9 13.8 2068 2068 0.856 0.856Fri 21-Mar-03 229.51 225.47 195.31 195.31 4.2 4.1 3.8 415 415 0.851 0.851Sat 22-Mar-03 0.00 0.00 0.00 0.00 0.0 0.0 0.0 0 0 0.000 0.000Sun 23-Mar-03 747.36 674.52 538.39 471.69 14.0 12.4 11.7 1518 1296 0.720 0.631

5984.3 5713.2 4938.4 4871.7 80.1 76.5 71.4 9452 9230 0.825 0.814

24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

2

Delivered Luminosity Losses

• ~1.0 hrs: SMT HDIs - 3-4 times during stores • Silicon device gets “stuck” and needs to be reinitialized or

disabled• ~1.0 hrs: L1 CTT – 2-3 times during stores

• Significant commissioning efforts outside of a store unintentionally affects data taking during stores

• ~1.0 hr: 50 Run transitions (~1 minute/per)• ~1.0 hr: 11 Begin or End Store transitions (~5 minutes/per)• ~2-3 hrs: Average 5% FEB during physics data taking

Major Sources of Downtime: Not recording during a store

Other Losses

17-Mar-03 3:50 0.62 TTK Trigger Rate

17-Mar-03 5:26 0.30 SMT VRB 6023-Mar-03 21:17 1.03 QCD Jet Gap Trigger Special Run

24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

3

Other D0 News Four Controlled Accesses • 17:00-17:15 Tue Mar 18th

– CFT PS Voltage Check

• 06:30-08:00 Fri Mar 21st – Calorimeter BLS Power

Supply & Noise Study– L1 Muon, L1 CTT, FPD

Commissioning

• 12:00-14:00 Sat Mar 22nd – FPD Commissioning– Calorimeter Noise Study

• 00:30-01:00 Mon Mar 24th – Muon Pixel Front End Board

• Not properly seated on rails

• Improved online data handling stability– “Many to one” Problem– Too many connections

between the 82 L3 farm nodes & the online host• During mini-March shutdown,

L3 farm nodes increased from 48 to all (82) dual connections

• Hit a wall at >40 Hz to tape– Split data stream to three

collector/routers• Stable running at <55 Hz to

tape• We could run at ~100 Hz to

tape with current event size, but…– Exceeds tape budget– Likely will need additional

dataloggers

24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

4

How well are we doing?

24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

5

Monthly Data Taking Efficiency

24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

6

D0 Integrated Luminosity

24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

7

Plans for Upcoming Week• No major problems affecting physics data taking

– Continue to utilize short controlled access opportunities• Tracking Trigger & FPD Commissioning• Infrequent minor Muon, SMT & Calorimeter electronic or

hardware issues – If shutdown opportunity of >12 hours arises, we will consider

replacing CAL preamp fan (Requires opening detector)

Add 3 or more Stores to this list next week!

24 March 2003 - All Experimenters’ Meeting

Alan L. Stone - Louisiana Tech University

8

L1/L2/L3 RatesStore 2128 – Thu Mar 20th from 08:47

~86% Eff.Initial D0 Luminosity was 3.95E30

Separator Scan

Studies