# Presentation: 144577

## DØ Status and OperationsMarch 25  – April 1, 2002

**Notable “features” of the last week**
**Upgraded L3/DAQ system**
**Few Master Clock glitches**
**Possible water leak in SMT**
**Reduced losses during shot setup ****(but higher halo rates?)**
**Reasonably smooth operations otherwise**

| 
Stores | Delivered Integrated Luminosity | Utilized
Luminosity | Live
Luminosity | Live
 fraction | Rate 
to tape |
| --- | --- | --- | --- | --- | --- |
| 9 | 1.72 pb-1 | 1.46 pb-1 | 0.79 pb-1 | 58.7% | 15.7 Hz |

## SMT Status

**SMT**
**Detector has been running fine and with good performance over last few weeks**
**Trips on water drip detection on the SE Interface Boards power supplies**
**Fri (1), Sat (3), Sun (7), Mon (1)**
**No trips since this morning, 6am...**
**In the cathedral area under the calorimeter cryostats and inside the muon iron**
**Investigation during access today found water dripping off glycol cooling pipe junction box, probably due to a vacuum jacket that was not holding vacuum**
**Suspect this may be an unrelated problem...**
**Have been adding about 1 gallon of DCW/day for last ~2 weeks**
**Will watch the situation over the next few days before making any decisions**
**Technical crews at DØ are rather light this week due to vacations**

## CFT Status

**CFT**
**131 of 198 AFE boards installed  **
**113 of these have revised temp and bias control circuits**
**166 AFE boards necessary to fully instrument the CFT+CPS.**
**100% ****	****CFT axial instrumented**
**100% ****	****CPS axial instrumented **
**  ****61% ****	****CFT stereo instrumented**
**  ****45% ****	****CPS stereo instrumented**
**    ****0%  ****	****FPS instrumented**
**Continue to study the behavior to optimize performance and improve reliability**

## Calorimeter & Muon Status

**Calorimeter**
**Running very smoothly**
**Work ongoing to understand small non-linearities in the charge to energy conversion for small signals**
**May necessitate changing a few components on BLS boards**
**Muon**
**Detectors are running very smoothly**
**Work on understanding and resolving readout issues ongoing:**
**Approximately 15% of the DØ dead-time from various flavors of muon readout problems**
**Some issues with the PDT front-end readout code.  Expect resolution soon – gain 5-8%**
**New Muon Fanout Card being tested.  Final install 4-6 weeks**
**Some unresolved issues with triggering and clock problems**

## FPD Status

**FPD**
**Taking elastic data and commissioning**
**Pots are inserted almost every store**
**Stand-alone DAQ - working on integration into the DØ DAQ by summer **
**Collimation studies have helped a bit with losses at the pots**
**Rates are still very high and were even higher than normal this last weekend**
**Timing studies planned with single coalesced proton bunch**

******p/p) distribution for **
**a sample of  clean elastic events**

**	**Scintillating fiber detectors in Roman pots near beam used to tag protons and anti-protons

- beam

- beam

**Proton Detector 1**

**Proton Detector 2**

## Integrated BLM Doses

- Shot Setup Integrated dose, March 10-31 2002

**#1152 BLM rates**

## DAQ Improvements

**Master Clock “glitches”**
**Culprit sighted but not apprehended yet...**
**VMETRO card caught write cycles that wipe out the dynamic time lines**
**Studies of multi-buffering capability in all subsystems ongoing**
**VRBC – Trigger and Tracking crates**
**Calorimeter readout**
**Muon readout**
**Needed for operation at > few hundred Hz and to reduce latency dead-time in L2 trigger**
**Expect a few more weeks to resolve all issues**
**Successful L2 trigger tests issuing Accepts and Rejects last week**

## Replaced L3/DAQ System

**L3 “Commodity” DAQ**
**Replace all VME Buffer Driver boards (VBD) by SBCs and send data over fast ethernet switches**
**SBC (Single Board Computer)**
**Intel ~1GHz, VME, dual 100Mb ethernet, 64MB flash for storage, running Linux OS**
**Routing of data blocks performed by specialized SBC which talks to the Trigger Framework – the Routing Master (RM)**
**Event building and trigger decisions performed by Linux farm nodes**
**Old system used NT DAQ nodes for event building with Linux farms for filtering**

## The Past System

**NT**

**Linux**

- D. Chapin

## The Future System

**Linux**

- D. Chapin

## The Transition System 

- ROC
- VBD

- ROC
- VBD

- ROC
- SBC

- ROC
- SBC

- CISCO 6509
- Switch

- trigger
- disable

- Farm
- CPU

- 48 farm
- nodes

- Routing
- Master
- CPU

- TFW info

- Farm
- CPU

- Supervisor
- CPU

- COOR

- VBDi

- VRC CPU

- VirtualSBC

- VirtualSBC

- D. Chapin

## L3/cDAQ continued

**All essential components have been ordered**
**All switches delivered and installed**
**58/72 SBC’s delivered**
**17/77 Digital I/O boards delivered**
**Expect to start installing SBCs in 2-3 weeks**
**5 installed now for testing and real operations**
**Software conversion was made on 3/26**
**Fine tuning and improvements in monitoring and operations**
**Waiting on purchase of additional farm nodes until dual P4 machines and maybe blades for the switch are available (late Spring-Summer)**
**Work on Trigger Crate for RM to have 128 disable lines to the TFW continuing (have 32 now)**