# Presentation: 358606

## DØ Status and Progress During Shutdown: Week Oct 29-Nov 5

**DØ Status and Progress During Shutdown: Week Oct 29-Nov 5**

**Have had access to the central region for 3 weeks – both the central and end muon irons open and the calorimeter endcap cryostats open**

**Begin closing up today ****– endcaps first**
**Close the central and ****end irons on Friday**
**Checkout of all systems.  ****DAQ operational 24 hours**
**Complete all work by 11/16**

## Fiber Tracker Electronics

**VLPC cryostats have been cold  ~ 2 weeks**
**Installation and testing of AFE cards in situ progressing: ****47 AFE boards installed and working + 8 “marching” boards used for checking slots.  Most boards working fine with few exceptions being debugged.**
**AFE board production and testing at SiDet and DØ**
**Infrastructure: 97/99 AFE slots tested for readout (2 missing a backplane).  2.5 bad slots, rest are good and ready for boards.  Prequalified slots work when boards plugged in.**
**By end of shutdown expect to fill all the CFT-axial slots, then CPS-axial/CFT-stereo then CFT-stereo only**
**L1 Trigger Electronics: Mixer boards are installed and 1⁄2 DFE boards**

## AFE Production & Testing StatusNovember 5, 2001

*** Many of the failed cards do not return to SiDet **
**^ Pass SVX, VSVX; 65 also pass LVDS (does not include weekend work)**
**@**** ****187 of 200 AFE slots commissioned**** **
**# ****Handwork underway, primarily at SiDet**
**+ ****First item of loaded left-handed board inspected today, 18 early next week.**
**Tuesday will discuss final shutdown configuration:**
**Will complete central axial (76) and much of central stereo (60+30)****Additional ~50 cards expected: Production ~20; operable but failing specs ~20 ; Withheld for testing trigger ~10.**

| Lot | Manuf. | Stuffed | SiDet | DAB3 | Installed |
| --- | --- | --- | --- | --- | --- |
| 1 | 146 | 146 | 123+16* | 69^ | 47@ |
| 2 | 54 | 54# | 14+22* | 0 | 0 |
| 3 | 44 | 18 Bottom LH+ | 0 | 0 | 0 |

## Mixer/DFE Status

**Mixer **
**16/20 installed; 4 for testing**
**Cabling underway**
**Digital Front End & Collectors/Broadcasters**
**20/40 DFEs installed, remainder Tuesday**
**Majority of Collectors/Broadcasters this week **
**Cabling underway**
**Integration of vertical slice 8-AFE/4-Mixer/****8-DFE/2-Collector/1-Broadcaster at DØ this week**

## Calorimeter

**Replacing fuses on Calorimeter analog front-end electronics power supplies with circuit breakers  ****> 2/3 done**
**Some repairs to preamplifier power supplies and cooling systems**
**Extra cableway shielding being added in central region**
**During the shutdown have identified and repaired about 150 bad channels and 41 noisy channels.    ****< 40 bad channels due to damaged cables and bad/disconnected cells in cryostats (<0.1%). **
**Waveform measurements: check uniformity**** of the calibration signal and determine**** correction factors if necessary**
**Reflection measurements: resistance, capacitance and inductance measurement of signal from preamplifier to signal pads in cryostats.  Allows refinement of the Spice models and determination of correction factors between physical and calibration signals.**

**Pulser Waveforms**

- 8 pulser signals

- PreAmp-Cryostat Cable

- Feedthrough

- various detector capacitances

- non connected cable

**Reflection Measurements**

- 48 channels

## Intercryostat Detector (ICD)

**Only South  had readout electronics drawers installed prior to shutdown (34/64)**
**Repairs to PMT HV bases and signal preamplifier boards almost complete ****(few %)**
**All tiles installed including 1⁄2 tile by cryoservices pipe**
**Checked signal seen from scintillator ****using radioactive source**
**Total number of channels = 376**
**ICD South – 1 dead, 2 low response****                      3 being checked**
**ICD North – 1⁄2 NW checked so far****                     4 to check on NE**

## Muon Systems

**New stops made for correcting positions of muon planes when detector closed based on survey results**
**Prototype polyshield being installed downstream of calorimeter endcap cryostat to reduce backgrounds in muon trigger.**
**Central (PDT and Scintillator)**
**Beam delays adjusted and trigger gates reduced factor      ~2-2.5 before shutdown  - will be tweaked some more with beam**
**Gain calibration for individual PMT thresholds**
**Worked on front-end electronics to reduce noise; fixing TOF gates for out-of-time particles**
**Completing commissioning of A-layer PDTs**
**Working on cleaning up noisy channels**

## Muon Systems (2)

**Forward (MDT and Pixels)**
**HV channels all working and calibrated to < 0.3%**
**Gas purged and in recirculating**
**~0.4% disabled wires**
**L1 Trigger**
**Completing installation of cables for CFT-muon match**
**FPGA fixes for readout**
**Commissioning PDT trigger**
**New scintillator algorithms being worked on**

## DAQ, Trigger and Data Processing

**DAQ**
**DAQ operational 24/7 for detector and sub-system commissioning**
**Online cluster fully kerberized**
**Isolation tests performed successfully**
**Trigger**
**Linux cluster (48 dual nodes 1GHz) for L3 filtering installed, commissioned ******** default today**

**L2 have 13 working alpha boards, 2 more coming**
**Expect to have L2 ****calorimeter, muon and global trigger after shutdown**
**Data Processing**
**Reprocessed about 4.9 million events with latest version of****RECO (10.07)**

## Forward Proton Detector

**Forward Proton Detector**

**Installing and testing 8 new detectors**
**Resolving some LV PS issues**
**Multiplexor and software upgrades for pot motion control**
**Install new scintillator ****veto counters****around beam pipe**