Bob van Eijk

1
Research Education Program

• presented by
• Bob van Eijk
• BAC Meeting
• University of Twente
• 11 November 1997

2
Contents

• Research at the
• The experiment at the LHC
• Other interests...
• Education
• Lectures at the University of Twente
• Opportunities for UT-students at the NIKHEF

3
The Large Hadron Collider

• Proton-proton collider (7 Tera (1012) eV per
  proton beam)
• use the current LEP (ee- collider)
  infrastructure at CERN
• new generation of experiments (start in 2005)
• high luminosity in 2007 (Lmax1034 cm-2 s-1 105
  pb-1 / year)
• Standard Model of electroweak interactions
• Higgs (the missing particle of the SM)
• Super Symmetry (SUSY) may give hint on SM free
  parameters
• Bottom quark physics s( ) 500 mb ? 5?1012
  per year _at_ Lstart1033 ? CP-violation, rare
  decays
• Top s( ) 1 nb ? 108 per year _at_
  Lmax1034 cm-2 s-1 ? precision
  measurements of couplings, rare decays
• W, Z, compositeness, ...

4
The CERN accelerator infrastructure
5
ATLASA ToroidaL ApparatuS

• General purpose detector
• lepton, ? and hadron energy/momentum measurement
• ?, electron, m, ? and hadron identification
• transverse missing energy measurement (?, SUSY
  particles, )
• Requires
• excellent charged particle tracking (central
  tracker s(pT)/pT 30 _at_ 500 GeV, hlt2
  m-system s(pT)/pT 11 _at_ 1 TeV)
• excellent electromagnetic calorimetry (s(E)/E
  10 /?E ? 0.7 )
• good hadronic energy measurement (s(E)/E 50
  /?E ? 3 , hlt3), s(E)/E 100/?E ? 3 ,
  3lthlt5)
• redundancy excellent alignment between
  sub-detectors

6
This is a placeholder for the big ATLAS
transparency from the ATLAS poster page
7
responsibilities

• ? - tracking system
• design and construction of 96 central outer
  chambers
• data acquisition and event trigger
• design and construction of data rooting
  architecture (140 million channels producing
  120 GByte/s)
• develop algorithms to reduce the first level
  trigger rate (100 kHz ? 10 kHz)
• event simulation and event reconstruction
• software engineering Object Orientation (OO)
• central tracking system
• forward silicon disk design and construction
• design and construction of pixel detector modules

8
2T solenoidal B-field
30ltRlt60 cm
60ltRlt120 cm
4ltRlt16 cm
Cylindrical volume 8m3 (?2.2m, L7m)
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140 million channels
2.3 m2 active silicon
14 kW total heat load
10
L1033 cm-2 s-1
L5x1033 cm-2 s-1 (mH 400 GeV)
11
Other interests...

• High radiation levels inside ATLAS
• silicon detectors at small radius do not survive
• search for alternative sensor diamond
• Beam telescope
• RD tool for strip and pixel detector development
• Fast microtrack imaging
• Training Mobility of young Researchers (TMR)
• collaboration with industries
• Physics simulations
• QCD calculations top physics
• SUSY modeling

12
SCT Radiation
Fluence of charged hadrons per cm2/year
Fluence of 1 MeV equivalent neutrons per cm2/year
Radiation dose (10 yrs LHC-equiv.) 0.8 - 1.3 x
1014 n/cm2 40 - 100 kGray (lethal dose 1 Gy)
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SCT Modules (Barrel)
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SCTReadout/Electronics

• binary front end
• noise lt 1500 e ? noise occupancy lt 5x10-4
• e 99
• radiation hard to 2x1014 n/cm2, 10 Mrad
• pipelined (128 long)
• optical data transmission and clock/control
• LED/PIN (820 nm)
• radiation-hard multi-mode fibre (2 out, 1 in)
• off-detector ROD and ROB
• redundant data paths and f/e chip bypassing
• Dtmin(L1) 2 bunch crossings

15
SCTSignal to Noise

• n-side strips (simulation)
• Cstrip 1.5 pF/cm _at_ 0 p/cm2
• Cstrip 1.2 pF/cm _at_ type inversion

16
SCT-Mechanics(Forward)

• 0-CTE, CFRP-support structures (space frame,
  disks)
• space frame carries disks, long services and
  cooling
• de-coupling of space-frame from disk (kin. mount)
• disk carries module, local services and cooling
• de-coupling of modules from disk (kin. mount)

17
Disk layout front view

view
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Disk Layout back view

19
New Physics New Hardware
( why cool a Si-tracker ? )
Ptot 25 kW
chan. 6.2106
Atotal 60 m2
Lmax 1034 cm-2 s-1
rsi 70 Wm-2
rel 350 Wm-2 (3.4 mW/chan.)
L dt 105 pb-1
Tsi -7 C
Dtbunch 25 ns
Lmax 7 m
?max 1.2 m
Astrip 9 mm2
Bmax 2 T
Pitch 75 mm
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SCT(principle of module cooling connection)
FE-chips
quartz fan-ins
heat spreader
silicon detectors
BeO hybrid
PG-connections blocks
disk
large flow ectronics cooling channel ? 4W
small flow detector cooling channel ? 1 W
Z
PG Pyrolythic Graphite ltherm ? 300 -700 W / m
K
R
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H? gg
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CP-Violation