1. 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

2. 20%-30% extension mass-scale reach
Physics 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

3. 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

4. Goals for ATLAS @ 1035 Detector Performance Detector Reliability
Strive to have same detector 1035 as will be 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 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

5. Coherent R&D Program What’s needed
Detailed simulation of radiation 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 1034
Test beam data and simulations already uncover ‘distress’ in some non-IP 1034
Dallas, TX Jan/6-7/04
F.E. Taylor

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

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

8. 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

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

10. 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

11. R&D Summary Measure detector performance @ 1035 in ’04 test beams
Unique opportunity – there may not be test beams thereafter
Simulate detector 1035
In many cases test data and simulations have not gone beyond conservative 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
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

12. References Radiation Background Task Force (M. Shupe et al.)
Activation studies (Vincent Hedberg)
F. Gianotti, M.L. Mangano, T. Virdee, et al. hep-ph/ (April 1, 2002)
Int’l Workshop on Future Hadron Colliders, FNAL, Oct. 2003
See talks by J. Rolf, A. Lankford, F.E. Taylor
ATLAS TDRs
GEM-TN ‘Ionization Calorimeter Noise Considerations’
Various Presentations
(see talk by D. Lissauer)
scenario/talks/dan_green.ppt
‘Space Charge in Ionization Detectors and the NA48 Calorimeter’, S. Palestini, hep-ex/
Intel web site
Dallas, TX Jan/6-7/04
F.E. Taylor