# Presentation: 939014

## Data Taking StatisticsWeek of 2003 January 6-12

**We had to sacrifice some efficiency this week**
**Accumulate statistics on new triggers & test new filter tools**
**Offline studies on performance over shutdown **
**Special Runs for Tracking & Jet Trigger Studies  **
**DAQ Rate test to establish next bottleneck to L1/L2 ~ 5/1kHz**
**Power outage this morning & subsequent online system upgrades, cooling water shutdown, etc. prevents a full accounting of this week’s Physics numbers**
**Will revise later & link from D0 Operations web page**

## Delivered Luminosity Losses

**Most problems above added 50-100% additional losses due to run pauses, readout crate front-end busies, L2/L3 disables, SCL inits, etc.  **
**L2 CAL solved by power cycling crate**
**L1 Muon LV PS will be repaired or replaced during shutdown**
**Tracking Triggers – procedural error**
**~0.5 hr:  30 Run transitions (~1 minute/per)**
**~1.0 hr:  9 Begin or End Store transitions (~5 minutes/per)**
**~1-2 hrs:  Average 2-4% FEB during physics data taking**
**See next slide  **

**Major Sources of Downtime:  Not recording during a store**

**Other Losses**

## Other D0 News 

**Muon Readout Crate Stability **
**New version of PDT code  **
**Tested during Store 2146 & made default with Store 2153**
**We are now running at rates of:**
**L1 ~ 1 kHz  &  L2 ~ 0.4 kHz**
**Running at ~90% for most runs in the last two stores**
**Higher rates incur a greater amount of FEB ~4-5%**

**Rec/Del Lumi = 96.7%**

**Store **
**2153**

**~3% FEB**

## L1/L2/L3 RatesStore 2155 – Sat Jan 11th  from 12:45 

**Instability **
**Due to **
**L2 CAL**

## Shutdown Schedule

## Alignment Work Requests

**Did Rad Survey on Sun Jan 12 at 13:00**
**Survey crews arrived at 08:00 Mon Jan 13**
**& finished first work by lunch**

## Sub-Systems Part IRepairs, Upgrades, Maintenance

**Silicon**
**Fix ~5% of problematic channels**
**Replace some low reliability boards**
**Upgrades of firmware and software**
**Retrieval of TLD badges and installation of new ones**
**Fiber Tracker & Pre-Shower**
**Warm up of cryostat**
**Move of some VLPC cassetes**
**Work on CTT electronics**
**FPS fiber bundles moves**
**Firmware upgrade**

**Calorimeter**
**Modifications to 1500 BLS cards (reduction of trigger noises by factor of ~2)**
**Pre-amp fans replacements**
**Finishing L1CAL full rapidity coverage**
**Inter Cryostat Detector**
**Radiation source test of North EC to check mapping & insure all tiles and cables are working**
**Replace ~10% of dead or marginal PMTs (from Run I) with new tubes (same model)**
**Swap out ~3% of faulty electronics**

## Sub-Systems Part IIRepairs, Upgrades, Maintenance

**Luminosity**
**Purge gas for PMTs (against He)**
**Muon**
**Fix broken wires in MDTs**
**Replace failed PMTs/bases in trigger counters**
**Upgrades to PDT firmware and software**
**L1 Muon**
**Repair power supplies**
**Fix to ~5% cables from CTT**
**Forward Proton Detector**
**Repairs to pots in the tunnel**
**Connection of detectors to D0 AFEs and DAQ**

**L2 **
**Upgrade (no lock step mode)**
**Upgrades and repairs to the online cluster**
**Lot of infrastructure work **
**New air filters**
**New power supplies**
**New pond water filters**

**Progress report will be given next week...**