# Presentation: 758501

## Status of ATLAS

**Mike Tuts**
**Columbia University**

## Outline

**Outline**

**ATLAS Detector**
**Commissioning status**
**Computing status**
**Physics readiness**
**Cosmic ray running**
**First beam**
**Near term shutdown activities**
**Future planning - upgrade**

## ATLAS

**ATLAS**

**MAGNETS**
**8 Barrel Toroids **
**Central Solenoid**
**End Cap Toroids**

**MUON SYSTEM**
***Monitored Drift Tubes (MDT)***
***Cathode Strip Chambers (CSC)***
**Resistive Plate Chambers (RPC)**
**Thin Gap Chambers (TGC)**

**INNER DETECTOR (ID)**
***Pixels***
***Silicon Strip (SCT)***
***Transition Radiation Tracker (TRT)***

**CALORIMETERS**
***EM - Liquid Argon – Lead***
***HAD - Scintillator Tile ***

**Diameter 25m**
**Length 46m**
**Weight 7,000 tons**

**TDAQ**
***ROI Builder***
***High Level Trigger***

## ATLAS Collaboration

**US Snapshot  as of Sept 30, 2008**
**43 US institutes are about 21-22% of ATLAS**
**5 affiliated institutes (in *****italics*****)**
**38/169 voting institutions (22%)**
**395/1817 “current M&O authors = PhDs” (22%) – for cat A/B**
**592/2800  M&O authors  + in process of qualifying + students (21%)**
**497.75/2347.25 Operations tasks share (students count .75) (21%)**

- HEPAP November 14, 2008 - Tuts

**	****Albany****, Alberta, NIKHEF Amsterdam, Ankara, LAPP Annecy, ****Argonne NL****, ****Arizona****, ****UT Arlington****, Athens, NTU Athens, Baku, IFAE Barcelona, Belgrade, Bergen, ****Berkeley LBL and UC****, HU Berlin, Bern, Birmingham, UAN Bogota, Bologna, Bonn, ****Boston****, ****Brandeis****, Bratislava/SAS Kosice, ****Brookhaven NL****, Buenos Aires, Bucharest, Cambridge, Carleton, Casablanca/Rabat, CERN, Chinese Cluster, ****Chicago****, Chile, Clermont-Ferrand, ****Columbia****, NBI Copenhagen, Cosenza, AGH UST Cracow, IFJ PAN Cracow, ****UT Dallas****, DESY, Dortmund, TU Dresden, JINR Dubna, ****Duke****, Frascati, Freiburg, *****Fresno State*****, Geneva, Genoa, Giessen, Glasgow, ****Göttingen,**** LPSC Grenoble, Technion Haifa, ****Hampton****, ****Harvard****, Heidelberg, Hiroshima, Hiroshima IT, ****Indiana****, Innsbruck, *****Iowa*****, ****Iowa SU****, ****Irvine UC****, Istanbul Bogazici, KEK, Kobe, Kyoto, Kyoto UE, Lancaster, UN La Plata, Lecce, Lisbon LIP, Liverpool, Ljubljana, QMW London, RHBNC London, UC London, *****Louisiana Tech*****, Lund, UA Madrid, Mainz, Manchester, CPPM Marseille, ****Massachusetts****, ****MIT****, Melbourne, ****Michigan****, ****Michigan SU****, Milano, Minsk NAS, Minsk NCPHEP, Montreal, McGill Montreal, FIAN Moscow, ITEP Moscow, MEPhI Moscow, MSU Moscow, Munich LMU, MPI Munich, Nagasaki IAS, Nagoya, Naples, ****New Mexico****, ****New York****, Nijmegen, *****NIU*****, BINP Novosibirsk, ****Ohio SU****, Okayama, ****Oklahoma****, ****Oklahoma SU****, Olomouc, ****Oregon****, LAL Orsay, Osaka, Oslo, Oxford, Paris VI and VII, Pavia, ****Pennsylvania****, Pisa, ****Pittsburgh****, CAS Prague, CU Prague, TU Prague, IHEP Protvino, Regina, Ritsumeikan, UFRJ Rio de Janeiro, Rome I, Rome II, Rome III, Rutherford Appleton Laboratory, DAPNIA Saclay, ****Santa Cruz UC****, Sheffield, Shinshu, Siegen, Simon Fraser Burnaby, ****SLAC****, *****South Carolina*****, ****Southern Methodist Dallas****, NPI Petersburg, Stockholm, KTH Stockholm, ****Stony Brook****, Sydney, AS Taipei, Tbilisi, Tel Aviv, Thessaloniki, Tokyo ICEPP, Tokyo MU, Toronto, TRIUMF, Tsukuba, ****Tufts****, Udine/ICTP, Uppsala, ****Urbana UI****, Valencia, UBC Vancouver, Victoria, ****Washington****, Weizmann Rehovot, FH Wiener Neustadt, ****Wisconsin****, Wuppertal, Würzburg, ****Yale****, Yerevan**

**37 countries**

## Recent Timeline

**2/08 Test of full computing chain (“Full Dress Rehearsal” FDR 1)**
**6/08 Closure of beam pipe**
**7/08 FDR 2**
**9/10/08 First beam!**
**9/18/08 “incident” - impact on plans**
**Now – shutdown work underway**

- HEPAP November 14, 2008 - Tuts

## Recent Detector Activity

**Overall test of the magnet system (including stability tests)**
**Re-installation and debugging of the Inner Detector evaporative cooling plant**
**Commissioning of the inner detectors**
**Fixing assorted calorimeter problems (low voltage, magnetic shielding,...)**
**Completion of the forward muon system (HO wheels, gas systems, debugging, tests)**
**Commissioning of the RPC system**
**Final installation of luminosity detector (LUCID)**
**Buttoning up the detector**
**Taking cosmics & first beam – splash events**
**Start of shutdown activities**

- HEPAP November 14, 2008 - Tuts

## In Pictures

- HEPAP November 14, 2008 - Tuts

**View in April, barrel toroids, small muon wheel, endcap toroid, big muon wheel**

**16****th**** June closure of beam pipe & insertion of LUCID detector**

**Top view during closure of ATLAS – muon big wheel and crane visible (top) – no incidents or damage!**

## Performance

**Toroids and end cap toroids now operating stably at 20.4kA (after in situ leak repair)**
**On/off ~5 hours**
**Inner detector evaporative cooling system compressors failed 7 repaired **
**Caused delay of ~3 months – so pixels had little commissioning time before close up**

- HEPAP November 14, 2008 - Tuts

**Testing of toriod magnets – reached stable operation at 20.4kA (almost nominal)**

**Cooling loop operating time vs cooling loop**

**204 cooling loops total – 1 not working or easily repairable**

**Operating Hours**

**1000**

## Operational Status Summary

- HEPAP November 14, 2008 - Tuts

| Subsystem | Current Problem /dead Channels | Comments |
| --- | --- | --- |
| Si - Pixels | 0.8% | Cooling loop leaks keeping 4.3% off till beam |
| Si - SCT | 0.4% (barrel); 2.2% (end cap) | Cooling loop leak (0.3%); heater short (0.6%) could be repaired |
| TRT | 1-2% |  |
| Calorimeter - LAr | <0.1% (EM, HEC); 1.7% (EC) | ~1%  currently bad readout channels – repair during shutdown |
| Calorimeter - Tile | 1.4% | 2 LVPS + isolated channels in digitizers, HV, timing errors etc |
| Muon – MDT Barrel/Endcap | 1.7% | HV, readout, gas – goal to reduce to ~0.2% |
| Muon – CSC | 1.6% | ROD readout remains an issue |
| Muon RPC/TGC | 10.4%/0.2% | RPC still commissioning; noise, HV |

## Trigger and DAQ

**Level 1 system fully installed**
**Much done with cosmics and splash events**
**Need colliding beams for some aspects**
**L2 & High Level Trigger**
**~35% of system installed (850 PC x 8 core)**
**100kHz -> 200 Hz**
**>200M cosmics recorded since mid-Sept**
**Secure remote monitoring developed**
**Using remote partition decoupled from network in ATLAS control room**

- HEPAP November 14, 2008 - Tuts

**HLT & L2 PC racks (~35% of total)**

**L1 Racks**

## Commissioning with Cosmics Inner Detector

**Inner detector (Pixels, SCT, TRT)**
**Integrated in readout**
**Noise performance is good**
**TRT fully operational**
**Now running final Xe gas**

**Cosmic in TRT (with Ar/CO****2****/O****2****)**

- HEPAP November 14, 2008 - Tuts

**Residuals show excellent performance and monitoring capabilities (~real time)**

**Cosmic track through TRT, SCT  & Pixels**
**(B = 2T)**

## Commissioning with CosmicsCalorimeters

**LAr calorimeters operational for 3 years**
**~All channels operating**
**Problem of LVPS in B field solved with shielding**
**Tile Calorimeter also operational for years**
**~All channels operating**
**Refurbishments complete**

- HEPAP November 14, 2008 - Tuts

## Commissioning with CosmicsMuon System

**All Muon chambers installed and used in global runs**
**Cathode Strip Chamber Read Out Drivers still being debugged**
**Noise under control**
**Excellent timing for RPC and TGC triggers achieved**
**Trigger system stable at 100kHz trigger rate**

- HEPAP November 14, 2008 - Tuts

**Cosmic ray in endcap muon system**

## Recent Computing Activities

**Work focused on preparing for data taking**
**Full dress Rehearsals (FDR1, 2) test end to end performance**
**Optimizing software performance**
**To meet Computing Model targets for CPU, memory, disk**
**FDR2A -> FRD2C improved CPU use efficiency by ~ x2 (ok for 2009, but need eventual further x2 improvement)**
**Event store and data management**
**Successful support for  many hundreds of Terabytes of cosmic + single beam data**
**Growing demand for access to detector data; scalability ok now, but may  require future work**
**US developed tagged database used for event-level selection**
**Production and Distributed analysis (PanDA)**
**Rolled out ATLAS wide  (initially US product)**
**So far handling 500k jobs/week with headroom to spare**
**Lots of operations driven development**

- HEPAP November 14, 2008 - Tuts

## Tier 1 Centers

- HEPAP November 14, 2008 - Tuts

## 2009 Computing Need Planning Assumptions

**Cosmics:  full detector cosmic ray run completed, but individual subsystem runs continue**
**960TB until ~April 09 (current LHC schedule), kept through 2009**
**Increased MC simulation data in light of no collision data – two passes of 25M (full simulation) + 160M (fast simulation)**
**Collision data: 8M seconds of LHC data taking**
**Increased from 6M according to Computing scrutiny group**
**User Analysis: reduced until collisions start**
**N-tuple analysis reduced to 50% of previous**
**Reco based analysis to 20% of previous**
**Doubled simulation**

- HEPAP November 14, 2008 - Tuts

## 2009 Requests

**ATLAS 2009 computing requests for Tier 1 and Tier 2 resources is unchanged from the 2007 estimate (even with current LHC delay)**
**US ATLAS is ~23% of the total**

- HEPAP November 14, 2008 - Tuts

|  | CPU (MSI2k) | Disk (PB) | Tape (PB) |
| --- | --- | --- | --- |
| Tier 0 | 7.6 | 0.7 | 8.6 |
| CAF | 5.8 | 3.3 | 1.1 |
| Total CERN | 13.4 | 4.0 | 9.7 |
| Sum of T1 | 28.4 | 20.9 | 15.8 |
| Sum of T2 | 27.0 | 13.3 | - |

|  | CPU (MSI2k) | Disk (PB) |
| --- | --- | --- |
| US Pledge | 7.3 | 5.8 |
| US Installed | 5.0 + 2.0 (in process) | 2.1 + 2.0 (in process) |

## ATLAS Data Export

**ATLAS exports all RAW and processed data from Tier-0 to Tier-1 and Tier-2 centers according to the Computing Model. The system can sustain the required rate of 1.2 GB/s .**
**Data distribution patterns are periodically revised as data types (triggers) and processing needs change**
**US ATLAS T1 (BNL) has demonstrated sustained data rates >500MB/s**

- HEPAP November 14, 2008 - Tuts

**MB/s**

**MB/s**

**Oct 7-13**

**Oct 9-10**

**BNL**

**BNL**

**1000**

**Day**

**1500**

## Production - 2008

- HEPAP November 14, 2008 - Tuts

**US**

**10k Jobs**

**Production breaks due to Software Cycle**

## US Production - 2008

- HEPAP November 14, 2008 - Tuts

## Commissioning with First Beam

**10:19am September 10, 2008 first beams observed in ATLAS**
**Synchronization worked on first try!**
**Muon system (MDT,RPC,TGC) on reduced HV; Lar (-FCAL HV) on; TRT on; SCT reduced HV; Pixel off; BCM/LUCID/MinBias Scint/Beam pickup; L1; DAQ; HLT used for streaming**
**“****Splash” events recorded**

- HEPAP November 14, 2008 - Tuts

## First Beam “Splash” Event

**First Beam “Splash” Event**

- HEPAP November 14, 2008 - Tuts

## First Beam Commissioning

**The beam events were used for determining timing**

- HEPAP November 14, 2008 - Tuts

**Beam pickup monitor provides reference timing for other detectors**

**Tile Calorimeter: relative response within the different barrels, after time of flight corrections and using beam splash events. The precision is at the ns level with a single barrel.**

**0**

**-10**

**TRT: Colors represent differences in time of flight for “splash” events (8ns). The precision is ~1ns.**

## First Beam Computing

**Effect of concurrent data access from centralized transfers and user activity**
**Overload of disk server**

- HEPAP November 14, 2008 - Tuts

**Throughput of data exports to T1’s**

**MB/s**

**Number of Errors**

## Soon to be real data...

- HEPAP November 14, 2008 - Tuts

**Top events from tt********WbWb********l********b qqb**

**Cross section 830pb**
**Integrated Lum 100pb****-1**
**Without b-tagging**

**Z’********e+e- ****SM couplings**

**SUSY observed as SM excess – could be early **

**Standard Model**
**H********ZZ*********llll**
**Integrated Lum 10fb****-1**

## 5+5 TeV vs 7+7TeV

**It is likely that the initial collision data will be at 10 TeV rather than the full luminosity of 14 TeV**
**Impact**
**Factors of 2 lower cross sections at few hundred GeV scales**
**More dramatic loss at TeV scales**

- HEPAP November 14, 2008 - Tuts

## US ATLAS Operations Program Budget

| USATLAS Operations Program Budgets (AY k$s) |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
|  |  |  | FY09 |  | FY10 | FY11 | FY12 |
|   | WBS | Task | Amount | Amount |  |  |  |
|   | 2.0 | Computing |               18,319  |          18,319  |          20,368  |          21,482  |          22,189  |
| Allocations | 3.0 | M&O |               14,726  |          14,726  |          10,610  |          10,997  |          11,325  |
|   | 4.0 | R&D |                 3,597  |            3,597  |            3,228  |            3,155  |            3,155  |
|   |  | Total USATLAS |               36,641  |          36,641  |          34,206  |          35,635  |          36,669  |
|  |  |  |  Full Guidance  |  CR  |  |  |  |
|   |  | DOE |               25,200  |          24,354  |          27,206  |          28,159  |          29,144  |
| Guidance |  | NSF |                 9,000  |            9,000  |            9,000  |            9,000  |            9,000  |
|   |  | Un-obligated + Carryover |                 4,134  |            4,134  |                 -    |                 -    |                 -    |
|   |  | Total |               38,334  |          37,488  |          36,206  |          37,159  |          38,144  |
| Manage |  |  |                 1,693  |               847  |            2,000  |            1,524  |            1,475  |

- HEPAP November 14, 2008 - Tuts

## 08/09 Shutdown Plans

**Last few weeks finalizing plans on**
**Commissioning completion activities**
**Start yearly maintenance**
**Readiness for beam resumption**
**Specific activities**
**Fix electronics\LV problems in calorimeters**
**ID cooling & gas: fix cooling loops, distribution racks, optical readout problems**
**Muon small wheel chambers: especially replace damaged TGC’s**
**Fix gas leaks in MDT & RPC systems**
**Replace muon MDT wheels readout fibers with rad hard**
**Assorted maintenance on all systems**
**Preserve access controls during this period**

- HEPAP November 14, 2008 - Tuts

## Planning for the ATLAS Upgrade

**Planning for the ATLAS Upgrade for higher luminosity running**
**Supporting R&D activities for the upgrade**
**Two coordinating bodies: Upgrade Steering Group and Upgrade Project Office**
**Synergy with CMS where appropriate on R&D**
**Develop coherent and realistic upgrade plan**
**Design with detector constraints in mind (power, cooling, access,...)**
**Retain technical experts in ATLAS**

- HEPAP November 14, 2008 - Tuts

## SLHC Luminosities

**Above is common (ATLAS/CMS/LHC) luminosity scenario agreed to in LHCC July 2008**
**This sets the conditions and timescales**
**Phase 1: 6-8 month shutdown at the end of 2012 (3 x 10****34**** cm****-2****s****-1**** by end)**
**Phase 2: 18 month shutdown at the end of 2016 (10****35**** cm****-2****s****-1 ****by end)**
**Still need to understand impact (if any) of LHC delay**

- HEPAP November 14, 2008 - Tuts

## Upgrade Overview

**For Phase 1**
**New insertable inner layer (b-layer) pixel layer**
**TDAQ **
** ****investigating TRT optimization**
**Studying the implication for all systems**
**For Phase 2 (high occupancy, high integrated and instantaneous luminosity)**
**All silicon tracker**
**Calorimeter electronics and readout; and forward calorimeter detector**
**TDAQ enhancements**
**Forward muon chambers; Be beam pipe; shielding**
**Magnets and most detectors remain in place**

- HEPAP November 14, 2008 - Tuts

## Upgrade Milestones

**2009 – Letter of Intent for ATLAS changes; TDR for new B-layer pixel system**
**2010 – Technical Proposal (may include options) for ATLAS changes for sLHC**
**2011 – Technical Design Reports**
**2012 (end) – Phase 1 changes get installed**
**2016 (end) – Phase 2 changes get installed in long shutdown**
**Remain adaptable, guided by:**
**Detector performance**
**Physics results**
**Machine schedule**
**For the US... the next slide shows a summary from the last JOG meeting**

- HEPAP November 14, 2008 - Tuts

## Brief Summary of US Upgrade R&D and Construction Activities

**US supported R&D activities (coordinated with ATLAS)**
**Pixel readout chip development; 3D pixel detector development; silicon strip detector development; electronics for silicon strip and Lar; stave design; tracker simulation**
**FY09 R&D will help form the basis of tracker design report**
**On Sept. 11, 2008 we presented our preferred plan for “Phase 1” of the upgrade motivated by the approved Phase 1 increase in luminosity of the LHC.**
**This included a full replacement of the tracker, FCAL and Trigger/DAQ upgrades and started in 2010, ended in 2018 and cost ~$130M**
**We were told there would be no money until 2011 (DOE) and the time scale was too long. 2010 funding may be possible for NSF.**
**We are considering a reduced scope proposal with the Pixel Insertion, and the Trigger/DAQ – but still worry that the full tracker replacement needs to start in ~2012 and so there could be two “projects” starting VERY CLOSE to each other**
**We have been told that there will be further guidance from the DOE and NSF soon**

- HEPAP November 14, 2008 - Tuts

## Conclusions

**Successful single beam and cosmic data runs**
**Demonstrated that all the advance preparations were critical to the success in capturing these data**
**ATLAS is ready for collisions!**
**Detector is working at the  ~98-99% level, although maintenance is taking place**
**No showstoppers on the horizon**
**Computing is capable of handling first data and distributing it worldwide**
**Planning for future upgrades is underway**
**Given US funding timescales, must start soon**
**By this time next year we plan to be able to show you data from actual collisions!**

- HEPAP November 14, 2008 - Tuts