# Presentation: 946482

## Data Taking StatisticsWeek of 2003 February 10-16

**Dedicated some luminosity to studies**
**Test of New Muon PDT Code**
**Introduced new hardware and firmware during shutdown**
**Verify that readout, rejection and integrity are fine**
**Preliminary results show no new problems**
** ****L2 Muon Efficiency**
**Introduced new L2 Muon code and look-up tables**
**Checked that the rejection & readout were as expected**

** ****Physics:  Recorded Lumi of 2.2 pb****-1**** or  ****80.8%****  of Delivered Lumi**
**Recorded 7.2 million Physics Quality Events **

**Full Detector**
**Readout**

## Delivered Luminosity Losses

**0.4 hrs:  14:55 Wed Feb 13****th**** – Muon Readout Crate   **
**Our online monitoring was not up to pre-shutdown quality...yet!**
**1.0 hrs:  Sat Feb 15****th**** – CFT+PS Readout Crates**
**Happened twice mid-store 2232.  Problem resolved by power cycling readout crates.  We took two inefficient runs during these periods.**
**0.5 hrs:  Sun Feb 16****th**** – SMT Readout Crate**
**Required expert help to disable a problematic HDI**
**~0.5 hr:  25 Run transitions (~1 minute/per)**
**~1.0 hr:  13 Begin or End Store transitions (~5 minutes/per)**
**~2-3 hrs:  Average 4-6% FEB during physics data taking**
**This has increased since pre-shutdown.  We are working on understanding how we can reduce the transfer times between the SVXII & the VRBs – the main source of L1 FEB in the Silicon, Tracker & Preshower readout crates.**

**Major Sources of Downtime:  Not recording during a store *****(>0.25 hrs)***

**Other Losses**

## Data Taking Stability

**Rec/Del Lumi = 96.7%**

**~5% FEB**

**Store **
**2229**

** ****557k triggered events **
** ****3.5 hours**
** ****Avg 44.4 Hz to tape**
** ****Rec Lumi = 135 pb****-1 **
** ****Zero pauses**

**Peak rates over stores 2213, 2229, 2231, 2232, 2234:**
**L1 ~ 0.9 kHz  **
**L2 ~ 0.45 kHz**
**L3 ~ 60 Hz**
**Running at ~90% efficiency for most runs**

**93.8% Eff.**

## Store 2232Sun Feb 16th from 06:53

## Controlled Accesses & Luminosity

**Drip Detector Trips in PC16**
**Frequent trips on Feb 10th & 11th were due to a short.  Metal prongs on back of detector strip were making contact with rack frame through vibrations**
**Isolated strip & rack**
**No water was found  **
**Central Muon Scintillator **
**	****Front-End Readout Crate**
**Replaced blown fuse**
**Debugging & Commissioning**
**CFT+PS, L1 Muon, L1 CTT **
**	****& FPD**

**D0 Luminosity**
**Detector configuration is the same as pre-shutdown.  No electronics, HV or cables were changed**
**Channel by channel checks on scope revealed no problems**
**Will perform check on D0 jet cross sections**

**07:00  12 Feb – 5 hrs**

**Replaced L1 Muon trigger card**
**Power cycled supply to a **
**	****Front-End Scintillator crate**

**21:30  13 Feb – 0.5 hrs**

## Other D0 News 

**Halo rate anomalies**
**Feb 13****th****:  One glitch at 10:00 & two around 13:30 (five minutes apart) in pbar halo which tripped some Muon MDT HV channels**

**DCA *****(cm)***** vs phi *****(rad)***

**Beam position stable**
**Within 0.5 mm from center**

## Plans for Upcoming Week

**New Trigger List: v10.20**
**Remove min bias on muon scintillator trigger**
**Excellent rejection at L2/L3 to remove cosmics**
**New triggers with L3 Muon filtering**
**Extend L1 CAL trigger from 2.4 to 3.2 in eta**
**No known major problems  **
**A few minor jobs pending access opportunity**
**Tracking Trigger & FPD Commissioning**
**Noisy Calorimeter tower due to SCA daughter card**
**Will continue to do post-shutdown system checkouts to validate trigger & data integrity**