# Presentation: 484337

## DZERO Operations

**Jerry Blazey**
**Northern Illinois University**

- December 2002

## Detector

**All elements in place**
**Commissioning:**
**Forward preshower (FPS)**
**Proton detector (FPD)**
**L1 Central Track Trigger (CTT)**
**Silicon Track Trigger (STT) under construction.**
**Change to ethernet-based DAQ very successful**

- December 2002

## Operations/Analysis

**Early September set a series of operational and analysis goals for fall/winter – highly successful!**
**Operations:**
**50pb****-1**** or more available for Moriond.**
**Recording physics data with >75% efficiency.**
**Intense work on reconstruction/processing **
**Upgraded version of reconstruction, improvements in tracking efficiency, object identification, etc**
**Reconstruction farms in place for high luminosity.**
**Physics analyses well underway for spring conferences**

- December 2002

## Silicon Microstrip Tracker Status

_**Silicon Microstrip Tracker Status**_

- Track finding in barrels and disks

- Barrels
- + disks

- Barrels
- only

- Run II data

-  

- 4 barrel layers
- axial + stereo strips

**p-side pulse height**
**1 mip ~ 25 counts**
**Signal/Noise ~ 12**
**Layer efficiency ~ 97%**

- H, F Disks/wedges

- December 2002

## Silicon Status

**Radiation **
**Increase of bias                                             current measured                                  and consistent                                     with expectations**
**Infers depletion                               voltage exceeds specifications @ 4fb****-1**
**Active Ladders/Wedges**
_**Device**_**	****	**_**Oct 01**_**	****	**_**Feb**_**	****	**_**Now**_
**Ladders: ****	****93.4%****	****	****93.1%****	****	****88.4% **
**F-wedges: ****	****92.7****	****	****91.5****	****	****91.3**
**H-wedges:****	****86.0****	****	****86.0****	****	****85.4**
**No loss in fiducial volume.**
**Some recovery expected during Jan access****.**

- December 2002

## Scintillating Fiber Tracker

**8 axial, 8 stereo layers fully instrumented**
**VLPC readout**
**Performing well**** **
**good light yield**
**layer ******** > 98%*** *

- Occupancy matches expectations

- track 

- Light yield

- December 2002

## Tracking Performance

_**Tracking Performance**_

**Survey-only alignment constants**

- Significant improvement expected from alignment with data in near future

- width = 36 m
- (beam) = 30 m
-   = 20 m

- track

- x

- y

**Impact **
**Parameter**
**Resolution**

- Impact
- parameter

**K****S ******** ********+ ********–**

- December 2002

## Muon System

- J/  +-

- scintillator

- Muon System standalone
-  = 750 MeV

- Match to  CFT tracks
-  = 83 MeV

**  ****Three layers of scintillator planes for triggering**
**  ****Three layers of drift tubes for precise track measurement**

- shielding

- Channels:
- MDT/PDT - 99.5%
- Scintillator - 99.9%
- Recover 1⁄2 in Jan Shutdown

- December 2002

## Calorimeter

_**Calorimeter**_

- _Run II High E__T__ 3-jet event_ET : 110, 240, 310 GeV
- Etmiss : 8 GeV

- Liquid argon calorimeterwith uranium absorber

- Calorimeter Level 1 triggers for electrons and jets: rates agree with Monte Carlo
- Channel Count: 97%

- Channel Count:  99.9%

- December 2002

## Forward Preshower Detector

- Extruded triangular scintillator strips with embedded WLS fibers:  14,988 channels
- u,v Stereo Layers with  2*X**0*  Lead Absorber
- Signal: Detector  clear fiber waveguides  VLPCs and Analog-Front End (AFE) Readout

- _Forward Preshower Detector_

***L0, FPS, ICD on EC-head***

**  ****System instrumented June 2002**
**  ****Offline reconstruction using matched u, v  **
**    ****clusters and energy correlation requirement**
**  ****Performance being optimized jointly with **
**    ****entire DØ VLPC detectors (CFT, CPS)**

- December 2002

## Forward Proton Detector

****

** ****t**

- Elastic scattering data

- Scintillating fiber detector inside

- Ten pot operation in readout will
-       begin after January shutdown
- Eighteen pot operations requires funds for PMTs

-  Routinely and reliably insert pots in every store
-  Detectors perform as designed
-              (good efficiency, resolution)
-  Have observed diffractive and elastic events
-  Heretofore standalone, integrating into trigger/daq

- December 2002

## Trigger/DAQ

**L1**
**Cal & Muon available**
**CTT commissioning underway**
**L2**
**Operating with CAL, Muon, Global**
**CTT & PS Commissioning underway**
**STT in assembly and installation**
**Input rate expansion early ’03 w/ alpha replacements **
**DAQ**
**Debugging FE readout**
**Last summer successfully installed an ethernet/commodities based DAQ.  **
**Meets 1 kHz L2 accept specification.**

- December 2002

## L1CTT

_**L1CTT**_

**Discriminator input available**
**Providing tracks to L1muon**
**L1 terms (in triggers now)**
**L2 and track and preshower cluster lists**

- L1 terms               Occupancy

- December 2002

## STT

- Silicon Trigger Card (STC)

**30****o**** azimuthal units, 6 crates**
**Common Motherboard w/ PCI communication**
**Fiber Road Card (FRC) receives and fans out CTT tracks**
**Silicon Trigger Card (STC) receives silicon data and filters silicon hits using  CTT tracks**
**Track Fit Card (TFC) fits trajectory**
**Huge progress this year, from prototypes to complete production **
**Commissioning 1****st**** sector at DØ **
**Firmware debugging**
**Interface with DØ systems**
**Operational Spring 2003**

- December 2002

## Luminosity (Through 11/01/02)

_**Luminosity (Through 11/01/02)**_

- (Commissioning etc.)

- CFT Fully Instrumented

- CFT Axial Instrumented

- December 2002

## 11/16/02

**Delivered: 1.00 pb****-1**
**Utilized:   0.98 pb****-1**** (98%) **
**To Tape:  0.86 pb****-1**** (86%)**

- December 2002

## Store 1995

- 168516
- 3.4hrs
- 10E30
- Live: 87%
- Tape: 35hz

- 168515
- 4.0hrs
- 15E30
- Live: 90%
- Tape: 31hz

- 168514
- 3.7hrs
- 15E30
- Live: 86%
- Tape: 36hz

- 168513
- 4.0hrs
- 20E30
- Live: 86%
- Tape: 33hz

- 168510
- 4.0hrs
- 25E30
- Live: 90%
- Tape: 33hz

_**Store 1995**_

- December 2002

## 11/11-17/02 

**Delivered: 5.8 pb****-1**
**Utilized:  5.3 pb****-1**** (92%) **
**To Tape:  4.2 pb****-1**** (72%)**

- December 2002

## Integrated Luminosity (Since CFT Fully Instrumented)

- _Month_       _Del(pb__-1__)_      _Tape(pb__-1__)_    _Eff(%)_
- June		  1.3		0.5		39
- July		  9.2		5.1		55
- Aug.		 11.1		6.1		55
- Sep.		16.5		10.0		61
- Oct.		21.5		13.8		64
- Nov		20.6		14.9		73

- Steady Improvement:
-      Downtime 10% to 2%
-      FEB/L2 Busy Decreasing

- Total
- Delivered:  80 pb-1
- To Tape:  50 pb-1

- December 2002

## Capabilities

**Trigger List now has ~100 triggers**
**Electron, dielectron,muon, dimuon, jets...**
**Runs comfortably up to 4E31 cm****-2****s****-1**
**Will keep pace                           with luminosity                         growth as                                   **
**L1CTT                                      completed **
**L2 CPUs added**
**L2&L3 filters                               expanded.**

- December 2002

## Remote International Monitoring for the DØ Experiment

**Remote International Monitoring for the D****Ø Experiment**

**Fermilab **

**NIKHEF**
**Amsterdam **

**Detector Monitoring data sent****in real time over the internet**

- DØ physicists in Europe use the internet and monitoring programs to examine collider data in real time and to evaluate detector performance and data quality. They use web tools to report this information back to their colleagues at Fermilab.

**DØ**

- The online monitoring project has been developed by DØ physicists and is coordinated by Dr. Pushpa Bhat from Fermilab.  Jason Webb, a DeVry University, Chicago, undergraduate student is helping develop and maintain the interactive tools for the remote physicists.

**D****Ø detector**

- December 2002

## January Shutdown

**De-rime VLPC liquid-helium system**
**Install bottom muon chambers**
**Maintenance of cyrogenic systems**
**Study SMT electronic shielding between cryostats.**
**Channel recovery: SMT, Muon, Cal**

- December 2002

## Run IIb Upgrade

**The present detector was designed for ~ 2fb****-1**** and 2 ******** 10****32**** cm****-2**** s****-1**
**The Director has set the goal of accumulating ~10-15 fb****-1**** before the end of the decade**
**Exceeds radiation tolerance of existing silicon detector**
**Requires higher luminosities, ~ 5 ******** 10****32**** cm****-2**** s****-1****, trigger upgrades**

**Replace Silicon Detector with a more radiation-hard version**
- Improve impact-parameter resolution (b-tagging) through additional layers and smaller beampipe
- Maintain good pattern recognition over || < 2

**Upgrade Trigger**
- Shift functionality upstream and increase overall Level 1 trigger capability – contain rates, dead time
- - Calorimeter clustering & digital filtering
- - Enhance track trigger to respond to      increased occupancies
- - Calorimeter cluster match with track
- Incremental Upgrades to Level 2, Level 3 Triggers and online system

- September 2002 Lehman Review recommended baselining of Run IIb upgrades.

- December 2002

## Run IIb Silicon Detector

**Single sided silicon, barrels only**
**Detector installed in two halves inside collision hall in ~7 month shutdown**
**Inner (vertexing) layers 0, 1**
**Axial only**
**mounted on carbon ****support **
**Outer (tracking) layers 2-5**
**Axial and stereo (tilted sensors)**
**Stave structures**
**Prototyping essentially done.**

- GEANTmodel

- December 2002

## Run IIb Silicon Performance

**	****b-tagging performance studied with full GEANT simulation and pattern recognition**

- Performance meets the physics requirements  (based on the Run II Higgs/SUSY workshop)

- mistag rate 1-2%

- b vs. Ejet

- b vs. jet

- b vs.
- fraction ofdead ladders

- Run II workshop assumptions for tight and loose tags

- December 2002

## Trigger Rates

**Core trigger menu, simulated at L=2e32, ********t=396 ns**

**Total rate:                              ~30 kHz    3.9 kHz**

- December 2002

## Conclusions

**DZERO up and running**
**Upgrade set to go...**
**Ready for and anticipating increasing luminosity**

- December 2002

## Cause for Concern:Retention of Expertise 

**Have seen a decreasing number of experts: already insufficient for calorimetry and muon tracker, STT next.**
**Multiple Causes**
**Poor perception of “detector people”**
**Institutional “fatigue”**
**Changing careers**
**Reduction in base program support**
**Uncertain international politics**
**Governmental agreements languishing**
**Difficulty obtaining visas**
**Experts predict a worsening problem – will impact data quality and efficiency**
**Requires action by collaboration & funding agencies**

- December 2002

## Calorimeter Experts

**Current: ~ 3-4 FTE already inadequate**
**Parua, SUSB: current coordinator**
**Schamberger, SUSB: electronics**
**Tuts, Columbia : project manager**
**Groer, Columbia : previous coordinator**
**Gao, Columbia: student**
**Fu, Columbia :student**
**Bassler, Paris : previous coordinator**
**Anticipated ~2 FTE**
**Beauceron, Paris : expert until 9/03**
**Princeton Postdoc: incoming 2003.**
**SUSB Postdoc: incoming 2003?**
**Schamberger, SUSB**

- December 2002

## Muon Experts

**Current, already inadequate, diminished:**
**General: Diehl(Fermi), Denisov(Fermi), Shpakov(Northeastern Postdoc)**
**PDTs: Marshall(Indiana,retires), Wobisch(Fermi Postdoc)**
**MDTs: Tokmenin(JINR, no visa), Yatsunenko(JINR) **
**Pixels: Evdokimov(IHEP, no visa), Vasilyev(IHEP, no visa) **
**Central trigger counters: Evdokimov(ITEP), Ito(Fermi), Doulas(Northeastern Postdoc)**
**Electronics: Baldin(Fermi), Hansen(Fermi)**
**Difficult to predict next year...depends on visa situation, agreement with Russia, retirement replacements.**

- December 2002

## Thoughts on Solutions

**Increase prestige of positions.**
**Institutional requirements to contribute FTE personnel, this requires attention and effort on everyone’s part with respect to international agreements and visas.**
**Encouragement/guidance from funding agencies – U.S. groups must have adequate support from the base program to operate detectors**

- December 2002

## 	In response to need for increased and retained expertise and remaining commissioning tasks
Request assistance with agreements and visas.
Prioritized requests for additional NSF/DOE support:
Postdoc support for calorimeter (e.g. Princeton, Louisiana Tech., Michigan State)
Faculty/postdoc support for L2Beta (Virginia)
Travel support for L2STT (Boston)
Supplemental support for computing (Michigan)

**Request assistance with agreements and visas.**
**Prioritized requests for additional NSF/DOE support:**
**Postdoc support for calorimeter (e.g. Princeton, Louisiana Tech., Michigan State)**
**Faculty/postdoc support for L2Beta (Virginia)**
**Travel support for L2STT (Boston)**
**Supplemental support for computing (Michigan)**

- December 2002