# Presentation: 297644

## DØ Status For Run 2a

**Leslie Groer**
**Columbia University, New York**

**-Introduction****-Run 2a Status**
**-Preliminary taste of the data**
**-Conclusion**

**Fermilab Users’ Meeting               June 12, 2001**

## DØ at start of collisions

**Run 1 ended 02/96**
**Upgraded all electronics, added new detector systems, shielding, etc...**
**Mechanically “complete” detector rolled in 01/26/01**
**Detector cabling continued in collision hall – completed during May shutdown**
**Run 2a began with proton beam delivery in March**
**First 1x8 bunch collisions    April 3-5**
**First 36x36 bunch collisions April 27-30**
**Shutdown                      April 30-June 1**
**First collisions with complete, closed detector and with solenoid (2T) and toroids (1.7T)            June 7 **
**We’ve been busy collecting data during that time**
**Time in all detectors**
**Commission with beam**
**Taking triggers on physics objects**
**Exercising global tracking**

## DØ Collaboration

**At last count**
** ****573 people**
** ****71 institutions**
**17 countries **
**and growing...**

## The Run 2a DØ Detector

**The Run 2a DØ Detector**

**Muon central and forward trigger scintillator**
**Muon forward mini-drift tubes (MDT)**
**Forward Proton Detector (FPD)**
**Shielding**
**Front-end readout electronics, Trigger, DAQ**
**Whole bunch more TLA’s (Three Letter Acronyms)**

- New!

- New!

- New!

- New!

- New!

- New!

- New!

- New!

- New!

**Silicon Microstrip Tracker (SMT)**
**Central Fiber Tracker (CFT)**
**Superconducting Solenoid**
**Central(CPS)/Forward Preshowers (FPS)**
**Inter-Cryostat Detectors (ICD)**

**Notes:**
Starting from central out
New silicon microstrip tracker (SMT)
New central fiber tracker (CFT)
Solenoid
Central and Forward Preshowers
New Intercryostat detectors (ICD)
New muon central and forward trigger scintillator
New muon forward mini-drift tubes
New Front-end readout electronics, Trigger, DAQ

## Silicon Microstrip Tracker

**6 Barrels**
**8 layers, 432 ladders**
**16 Disks**
**12 central, 144 wedges**
**4 forward,   96 wedges**
**3m****2**** silicon, 800k channels**
**6 detector types**
**3,6,8,9 chip readout (SVX2)**
**Double- and Single-sided**

**100% of detectors are instrumented, 90%   operational**
**6% of devices not under power**

**H disk**

**barrel**

**F disk**

## Silicon: Tracking Results

**Silicon: Tracking Results**

**Offline tracking **
**4 hit tracking**
**No B-field, alignment, multiple scattering, etc. included**
**Results match those from L3**
**From the official, standard versions of offline reconstruction and L3 code**

- 3D Event Displays

## Event with 6 tracks pointing to same vertex

***36 ************ 36 Store Run 119679, Event 231653*****Level 3 (software trigger) Silicon-only Tracking**

## DØ Vertex Distributions

**DØ Vertex Distributions**

**Analysis of one of the first 36x36 runs**
**Primary vertices reconstructed from tracks in silicon:**

**X****vtx****=+0.274 cm**
**Y****vtx****=+0.315 cm**
**Z****vtx****=+7.036 cm**

## Central Fiber Tracker 

****** ****0.2% compromised channels**
**Electronics chain is complete except for Analog Front End readout boards**
**Performance problems delayed board production and delivery**
**10 in hand, balance for Fiber Tracker and Central Preshower due ~1-2 weeks (partial delivery today)**
**Slight modifications and testing**
**Install in next 1-2 months**
**Minimal L1 occupancy trigger (2/8 layers) in one phi sector capability at moment**
**Complete trigger components ~ 1-2 months**

**C**entral** F**iber** T**racker** **
**C**entral** & F**orward** P**re**s**howers

**Fiber Tracker and **
**Central Preshower**

**Forward Preshower**

## Fiber Tracker and Preshower Readout

**Fiber Tracker and Preshower Readout**

**Using prototype Front End boards**
**4000 channels timed in**
**5% Fiber Tracker (5 axial,   1 stereo)**
**3% Central Preshower            (1 axial)**

**1 x 8 commissioning**
**Detectors timed in**
**Occupancy measurements**
**MC 6% ******** can handle 4-5 MinBias events**
**Measure ~3% ******** could handle 8-9 MinBias events**

- Fiber Tracker
- Photopeak Spectrum

- Central Preshower MIP Peak

- 0

- 1

- 2

- 3

- 4

- ADC Counts

## Fiber Tracker: Offline Tracking

- Since B=0 for this run, real tracks
- should be found with 1/pT = 0

- 5 hit tracks

**+**

**+**

**+**

**+**

**+**

## First DØ Global Track in SMT + CFT

**Axial**

**Stereo**

**3D**

- Track with 5 fiber tracker hits, 5 3D silicon hits

- Relative alignment
- of silicon and fiber trackers
- verified to 40 m level

## Calorimeter/ICD

**98% Electronics installed; commissioned; <0.5% bad channels**
**ICD tiles/waveguides installed; 60% instrumented and commissioned**
**Timed in to 100 ns**
**L1 Central trigger installed and functioning to, readout+L2 ~ 1 month**
**Endcap trigger ~ 1 month**

## Calorimeter Energy

**EM Energy in **
**Calorimeter Towers**

**Hadronic Energy in**
**Calorimeter Towers**

**“****Multi-something” event?**

****

****

**r-z view**

**r-******** view**

**+z**

**“****LEGO” plot**

**+z**

## Muon System

**Central PDT**
**94 drift chambers**
**Fully installed**
**Readout ~ 50%**
**Timing adjusted to 100 ns**
**Forward MDT**
**50,000 wires**
**Fully operational**
**Timed in to 50 ns**

**Central scintillator**
**990 counters**
**Forward pixel scintillator**
**4608 counters**
**Fully operational**
**Timed in < 10-20 ns**
**Scintillator + PDT centroid triggering and tracking to L1/L2**
**45% installed, rest ~1-2 months**

**Central scintillator**

**Forward pixel scintillator**

**Forward Mini-Drift Tubes**

**Central Proportional Drfit Tubes**

## Forward Proton Detector

**Forward Proton Detector**

**18 Roman pots**
**9 independent momentum spectrometers (1 dipole, 8 quadrupole)**
**All castles installed + cabled + electronics**
**1 spectrometer fully instrumented, being commissioned**
**Remaining eight installed in Fall**

## Conclusions

**	****	****	****   ****Run 2a well underway**
**Colliding beam delivered every day since June 7**
**Many systems to complete commissioning and calibrate in the next few months**
**Will complete final installation of all pieces with some access by Fall (Aug/Sep)**
**We expect to have a fully physics capable detector with stable running conditions before the end of 2001**
**Look for physics results about this time next year, based on integrated luminosity possibly exceeding that of all of Run 1!**

## Backups

## L2/L3 Trigger Components

**L2 system control board problems mostly solved**
**Calorimeter/Muon/Global will be ready in June-July**
**Fiber Tracker/Preshower will be in place in the Fall**
**Silicon Track Trigger**
**Engineering design complete**
**First prototypes of most components under evaluation**
**Expect completion in Spring 2002**

**Depends on high-speed serial data link electronics**
**Preliminary version combined with software emulation will be in place in next few weeks**
**This will provide ~10% throughput capacity     (100-200 Hz from L2)**
**Complete final version will be operational by October**
**Accept 1 kHz from L2**
**Linux farm for L3 filtering**

_**L2**_

_**L3**_

## DØ Inner Detectors

**Central Tracking Region**

## Global Tracking

**Tracks found with L3  software**
**9 axial hits (5 Fiber Tracker + 4 Silicon)**
**4 stereo hits (Silicon)**

## Forward Muon: Commissioning

**Forward Muon: Commissioning**

**No major problems**
**Timing adjusted to ~20 ns (Pixels)/ ~50 ns (MDT)**

_**Pixels**_

_**MDT**_

- (ns)

- 18.8 ns

## Central Muon: Commissioning

**Readout of ~50% of PDTs**
**Timing in started**

**Readout of complete system**
**All channels active**
**First pass timing done**
**Triggering on muons**

_**Scintillator**_

_**PDT**_

- _Aphi_

- (ns)

## L1 Trigger

**Muon**
**Triggers taken and verified with hits**
**Full readout to L2**
**45% installed now**
**Give scintillator + PDT centroid triggers**
**Complete installation during next 1-2 months**

**Calorimeter**
**Triggers taken, but not verified (readout to L2 in <1 month)**
**80% instrumented.   Remainder in ~ 1 month**

**Fiber Tracker/Preshower**
**Small fraction of occupancy trigger**
**Working system in time for Front End board installation **

## CFT/CPS/FPS

**All cassettes installed**
**Eight stereo board readout working – used for timing in with beam**
**Prototype AFE boards installed**
**Expect to get a partial tracking trigger system to explot the AFE readout**
**First shipment of AFE boards here this week**
**CPS and FPS fully installed**
**Photo-peaks seen from LEDs and collisions using stereo boards**
**Awaiting arrival of AFE8’**

## DØ Current Status

| Sub-system | Installed | Instrumented | Operational |
| --- | --- | --- | --- |
| SMT | 100% | 100% | 90% |
| CFT/CPS | 100% | 6% | 6% |
| FPS | 100% | 0% | 0% |
| Calorimeter | 100% | 98% | 98% |
| CAL-Trigger | 80% | 80% | 33% |
| ICD | 99% | 60% | 60% |
| Muon PDTs | 100% | 100% | TBD% |
| Muon MDTs | 100% | 100% | 100% |
| Muon Trigger Counters | 100% | 100% | 100% |
| L1 Muon | 100% | 45% | 45%? |

## L1 muon triggered event

- xy view, looking North

- zy view, looking East

- xz view, looking down

## Luminosity Measurements

**Luminosity counters**
**timing**

- Vertex distribution along z of min bias events:

- Luminosity
- ( coincidence)

- Proton halo

- ~5  1027 cm-2 sec-1

- Antiproton halo

## Luminosity Prospects

- A possible scenario for Run 2a...

- 2001:  ~80pb-1

- 2002:  ~470pb-1

- 2003:  ~1300pb-1

## Run 2b Upgrade

**Primary focus is Higgs **
**Critical need is to upgrade the silicon tracker and trigger systems**
**Original Run 2 design was for 2-4 fb****-1**
**Build new tracker optimized for Higgs **
**Build to withstand 15-30 fb****-1**
**Improve b-tagging performance**
**Minimize risk**
**Avoid partial replacement**
**Use established technologies**
**Simplify design **
**Use elements common to other experiments (CDF, CMS)**
**Increase trigger rejection to maintain Run 2a rates with higher luminosity**

## Run 2b Silicon Tracker

_**Status**_
**Have baseline tracker design**
**6 layer full replacement for SMT**
**cost ($6.8M + $3.2M contingency) and schedule (Dec 2004)**
**Sensor probing and radiation tests are taking place now**
**Developing specifications for sensor prototypes**
**Working with chip designers and CDF on detailed SVX4 specifications**
_**Schedule**_
**9/04: Tracker construction completed**
**12/04: Tracker installed**

## Hits in Central Preshower Detector

- Preshower hits

- Fiber tracker hits

## Vertex finding

**Primary vertices reconstructed from tracks in silicon:**