ATLAS @ SLHC Non-Inner Detector Upgrades Shortened Version Frank Taylor MIT Workshop on ATLAS Inner Detector (ID) Upgrade R&D SMU, Dallas TX January, 6-7, 2004

20%-30% extension mass-scale reach Physics Reach @ 1035 20%-30% extension mass-scale reach F. Gianotti Int’l Workshop on Future Hadron Colliders, FNAL, Oct. 03 Dallas, TX Jan/6-7/04 F.E. Taylor

s ~ 80 mb -> ~ 1010 min. bias ev / sec SLHC Environment s ~ 80 mb -> ~ 1010 min. bias ev / sec Dallas, TX Jan/6-7/04 F.E. Taylor

Goals for ATLAS @ 1035 Detector Performance Detector Reliability Strive to have same detector performance @ 1035 as will be achieved @ 1034,33 Needed for rare modes such as H -> mm, H-> Zg, ZL-ZL However, physics ‘imperative’ will evolve with LHC data Emphasis may narrow to study of massive objects produced centrally decaying into e+e- … Some compromises may be necessary, e.g. less coverage at high |h| Detector Reliability Strive to have detector elements and electronics sufficiently rad-hard as to be able to run for long periods @ 1035 (~1,000 fb-1/yr) Assume at outset that replacement of components on ~ one year time scale would be unacceptable Upgrade R&D Program to be mindful of these goals Dallas, TX Jan/6-7/04 F.E. Taylor

Coherent R&D Program What’s needed Detailed simulation of radiation environment @ 1035 Most of background will come from IP so can be predicted by scaling from 1034 with or without additional shielding Single beam bkg will be smaller but dependent on details of IR upgrade – details to be worked out Critical appraisal of detector performance under expected high rates Most studies of high-rate performance have been directed towards certification of good operation @ 1034 Test beam data and simulations already uncover ‘distress’ in some non-IP subsystems @ 1034 Dallas, TX Jan/6-7/04 F.E. Taylor

ATLAS Detector Scale given by Muon System and calorimeter Dallas, TX Jan/6-7/04 F.E. Taylor

Ionization Dose Gy/Yr @ 1034 3x103 Gy/yr 3x101 Gy/yr Dallas, TX Jan/6-7/04 F.E. Taylor

ATLAS ID upgrade Modularity of the ID Now one barrel, two endcaps (inner and outer) and the PIXEL system See no reason to change this SLHC : there are natural changes as function of radius so could consider longer assemblies but have to watch installation limitations TRT endcap A+B TRT endcap C TRT barrel SCT barrel SCT endcap Pixels Dallas, TX Jan/6-7/04 F.E. Taylor

From Intel November 4, 2003 G. Moore, Elect.38 ‘65 NT doubles ~ 2 yrs Dallas, TX Jan/6-7/04 F.E. Taylor

Intel – 2 Intel High k: HfO2, ZrO2, TiO2 IBM developing V-Groove Reduces the ‘short-channel’ effect Dallas, TX Jan/6-7/04 F.E. Taylor

R&D Summary Measure detector performance @ 1035 in ’04 test beams Unique opportunity – there may not be test beams thereafter Simulate detector operation @ 1035 In many cases test data and simulations have not gone beyond conservative estimates @ 1034 SLHC ATLAS detector should at least cover |h|< 2 with ‘present baseline’ performance Concentrate on defining issues & solutions here first Extending operation to |h|>2 will be a greater challenge Experience @ 1033 to 1034 will add focus on real problems but may be late to impact upgrade construction Detector upgrades to be weighed against physics goals Dallas, TX Jan/6-7/04 F.E. Taylor

References Radiation Background Task Force (M. Shupe et al.) http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/RADIATION/Radiation_Levels.html http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/RADIATION/RTF_SummaryPage.htm Activation studies (Vincent Hedberg) F. Gianotti, M.L. Mangano, T. Virdee, et al. hep-ph/0204087 (April 1, 2002) Int’l Workshop on Future Hadron Colliders, FNAL, Oct. 2003 http://conferences.fnal.gov/hadroncollider/ See talks by J. Rolf, A. Lankford, F.E. Taylor ATLAS TDRs GEM-TN-93-262 ‘Ionization Calorimeter Noise Considerations’ Various Presentations http://www.hep.wisc.edu/USLHC/ (see talk by D. Lissauer) http://www-project.slac.stanford.edu/lc/local/ scenario/talks/dan_green.ppt ‘Space Charge in Ionization Detectors and the NA48 Calorimeter’, S. Palestini, hep-ex/9909025 Intel web site http://www.intel.com/research/silicon/mooreslaw.htm Dallas, TX Jan/6-7/04 F.E. Taylor