# Presentation: 670183

## Data Taking StatisticsWeek of 2003 March 24-30

**Corrections to Physics Luminosity & Events to Tape**
**Special Runs: Muon Trigger Study **
** ****Recorded 49 nb****-1**** &  167k of non-Physics events**** **

|  | Recorded Physics Lumi | Efficiency | Physics Events
(million) |
| --- | --- | --- | --- |
| This Week | 3.1 pb-1 | 83.4% | 8.3 |
| Last Week | 4.9 pb-1 | 81.4% | 9.2 |
| Best Week
(2002 Dec 30-2003 Jan 5) | 5.7 pb-1 | 83.1% | 14.5 |

## Delivered Luminosity Losses

**~1.0 hrs:  SMT HDIs  - several times during stores **
**Silicon device gets “stuck” and needs to be reinitialized or disabled**
**~0.5 hr:  30 Run transitions (~1 minute/per)**
**~0.5 hr:  9 Begin or End Store transitions (~3 minutes/per)**
**Improving downtime at the beginning and end of stores!**
**~2-3 hrs:  Average 5% FEB during physics data taking  **

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

**Other Losses**

## Other D0 News 

**Three Controlled Accesses**** **
**16:00-18:45 Mon Mar 24****th****         **
**CFT, L1 Muon work**
**SMT Sequencer swap**
**21:30-22:30 Wed Mar 26****th****          **
**Calorimeter BLS Board Swap**
**08:30-09:30 Fri Mar 28****th****  **
**L1 CTT cable check**
**SMT Sequencer swap**
**Water Flow Sensor**
**Tripped power to Platform rack at 07:05.  Power to half of the Silicon was lost.**
**Only affected ~30 min of data taking as store was lost at 07:35**
**Problem duplicated by tapping pipes – bad sensor was disabled.  We have redundancy in that region. **

**Supervised Access on Fri 16:00-23:00**
**Calorimeter Preamp Fan Failure**
**Second fan failure in preamp box 3.  Triggered major alarm limit just after 14:00**
**First one failed March 5****th**
**High infant mortality?**
**Temperature rose from 58 C to nearly 70 C over a 20 minute perdiod.  Any higher, the klixon would shut off the power. **
**Forced to power down**
**Requested pending shot setup be delayed as we did not want to run with a compromised Calorimeter over the weekend**
**Garbage data for any analysis dependent on EM and MET**

## Temperature Archiver

## Calorimeter Preamp Boxes

**Twelve preamp boxes each with 5k preamps cooled by heat exchanger and three fans**

## Calorimeter Preamp Fans

**SA began at 16:00.  Opened detector by 18:15 **
**	****to gain access to CAL West Preamp boxes.  **
**Fan replacement from through 21:45.  While we **
**	****were up there and open, a check was performed **
**      ****of all West preamp fans.**
**Found another dead fan in adjacent box!**
**The detector was closed by 23:00, and Search & Secure began at 23:10.**
**Thanks to the hard work by D0 engineers & technicians, many on the job for 16+ hours Friday!**

## Plans for Upcoming Week

**Will provide a follow-up on the Calorimeter Preamp Fan next week**
**Developing a longer term strategy**
**Better testing, monitoring, other?**
**Autopsy is not complete**
**Also still need to speak with manufacturer**
**Need to resurvey the West & North EF in a timely fashion**
**Can do in separate jobs**
**1-2 hours for WEF & 2-3 hours for NEF**
**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 as well as second order improvements**

## Monthly Data Taking Summary

- If we
- extrapolate from this line...