# Presentation: 242712

## DØ Status and Progress Dec 17, 2001  – Jan 7, 2002

**Reasonably smooth operations during the last few weeks**
**Not many changes in functionality due to the holidays – concentrated on data taking**

|  | Integrated Luminosity | Live | Live fraction | Rate to tape |
| --- | --- | --- | --- | --- |
| 17 Dec – 23 Dec | 1.03 pb-1 | 365 nb-1 | 35.3% | 6.9 Hz |
| 24-Dec – 30 Dec | 1.02 pb-1 | 407 nb-1 | 39.8% | 5.7 Hz |
| 31-Dec – 7-Jan | 1.36 pb-1 | 669 nb-1 | 49.3% | 6.2 Hz |
| Total | 3.41 pb-1 | 1.44 pb-1 | 42.2% |  |

## SMT Status

**SMT**
**3 power supplies off, ~1/3 off on another supply**
**~ 50% of channels under power**
**Operational fix attempted caused ‘latch-up’ conditions of op-amps – too much current draw (backpowering of 5V and 15V due to op-amp and comparator circuits)**
**Noise input on Vcal not fixed by Schottky diode on sequencer boards**
**Hampered by limited ability to test for causes and solutions outside of the real detector environment**
**Access later this week to address all these problems**

## DØ Status

**Calorimeter**
**Running very smoothly**
**Problem with 2 supplies in platform – replaced**
**One supply in counting house (12/25) – repaired**
**Muon**
**Running very smoothly**
**One supply fixed during access**
**CFT**
**118 Class A AFE boards through Phase 5 testing**
**101 AFE boards installed on platform**
**Improved understanding of temperature and bias control issues**
**Reduced latch-up conditions to ~ 1%/day**
**Improved air cooling on platform during accesses **
**Upgrades to AFE power supplies controls tested and ready for installation**
**MCM recovery in progress (need 160, have 29+18)**
**Board repair in progress**
**Reconstructed tracks in the axial view**

## DAQ System

**L3 DAQ**
**Final production VBDi installed – testing**
**Waiting on SIBs for final VRCs**
**Still seeing frequent resets and event loss due to parity errors**
**VBDi’s being tested in test stand at board house with full readout DAQ**
**Firmware downloadable locally – speeds up testing and integration**
**Short term goal (2 weeks) – have 3 VRCs running smoothly at Dzero**
**February time scale for SIB + 4 more VBDi’s**
**L2 Trigger**
**Been testing in global runs for last few weeks**

## Access Plans for 01/09-01/10

**Wednesday 01/09**
**04:00 Dump beam**
**04:30 Supervised Access**
**04:30-10:00 Open EF South and CF**
**Thursday 01/10**
**12:00-18:00 Close CF and EF South**
**18:00-22:00 Survey fully closed detector**
**CF bottom B-layer PDT recheck**
**EF N/S elevation**
**22:00 Search and Secure**

## Cathedral Work during Access

**SMT**
**Suspect 3 bad power supplies**
**NW1 - bad VCC1 (swap)**
**SW1 - bad VCC3 (repair)**
**SW0 - bad VCC3 (swap)**
**NE1 - bad 15V (probably fuse)**
**Replace all 15V fuses (5A ******** 7.5A) – test and adjust trip levels (6A)**
**Individual resistive fuses on some Interface Boards (3)**
**Calorimeter**
**Replace a secondary power supply for preamplifiers**
**Fix a few bad channels**
**Fix a few bad temperature probes**
**Muon**
**Fix readout for two PDT layers**

## Other Work during Access

**CFT**
**Install modified boards for one crate to address latch-up problems – modified resistors, capacitors and firmware**
**Install new firmware for the AFE power supply controllers - improve reliability and allow independent control of power supplies to each half of AFE crates**
**Investigate link timing out of the AFE boards and into the mixers**