UT, Enschede, 11/11/'97Research & Education Program, Bob van Eijk1 presented by Bob van Eijk BAC...

UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk

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presented by

Bob van Eijk

BAC Meeting

University of Twente

11 November 1997

Research & Education Program


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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


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The Large Hadron Collider

• Proton-proton collider (7 Tera (1012) eV per proton beam)– use the current LEP (e+e- collider) infrastructure at CERN

– new generation of experiments (start in 2005)

– high luminosity in 2007 (Lmax=1034 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 ( ) = 500 b 51012 per year @ Lstart=1033

CP-violation, rare decays

– Top: ( ) = 1 nb 108 per year @ Lmax=1034 cm-2 s-1 precision measurements of couplings, rare decays

– W’, Z’, compositeness, ...

bb bb

tttt


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The CERN accelerator infrastructure


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ATLASA ToroidaL ApparatuS

• General purpose detector– lepton, and hadron energy/momentum measurement , electron, , and hadron identification

– transverse missing energy measurement (, SUSY particles, …)

• Requires:– excellent charged particle tracking (central tracker: (pT)/pT = 30 % @

500 GeV, ||<2; -system: (pT)/pT = 11% @ 1 TeV)

– excellent electromagnetic calorimetry ((E)/E = 10% /E 0.7 %)

– good hadronic energy measurement ((E)/E = 50% /E 3 %, ||<3), (E)/E = 100%/E 3 %, 3<||<5)

– redundancy: excellent alignment between sub-detectors


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This is a placeholder for the big ATLAS transparency from the

ATLAS poster page


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- 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

responsibilities


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2T solenoidal B-field

Cylindrical volume: 8m3 (2.2m, L=7m)

4<R<16 [cm]

30<R<60 [cm]

60<R<120 [cm]


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140 million channels 2.3 m2 active silicon 14 kW total heat load


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L=1033 cm-2 s-1L=5x1033 cm-2 s-1 (mH = 400 GeV)


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Other interests...• High radiation levels inside ATLAS

– silicon detectors at small radius do not survive…

– search for alternative sensor: diamond

• Beam telescope– R&D 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


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Fluence of charged hadrons per cm2/year

Fluence of 1 MeV equivalent neutrons per cm2/year

SCT Radiation

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 < 1500 e noise occupancy < 5x10-4

– = 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

• tmin(L1) = 2 bunch crossings


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SCTSignal to Noise

• n-side strips (simulation)• Cstrip = 1.5 pF/cm @ 0 p/cm2

• Cstrip = 1.2 pF/cm @ type inversion


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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)


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Disk layout: front view

view


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Disk Layout: back view

view


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New Physics New Hardware

mb 70NSDσ

Astrip = 9 mm2Astrip = 9 mm2

Tsi = -7 C

si = 70 Wm-

2

el = 350 Wm-2

(3.4 mW/chan.)tbunch= 25 ns

L dt = 105 pb-

1

year1

0

Lmax = 1034 cm-2 s-

1

#chan. = 6.2*106

Ptot = 25 kWAtotal = 60 m2

pb 0.1susysignalσ

Lmax = 7 mmax = 1.2 mBmax = 2 T

1000GeV

1 sig

tP1000

GeV1

sigtP

# tracksavg

250 300# tracksavg

250 300

( why cool a Si-tracker ? )

Pitch = 75 m


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SCT(principle of module cooling connection)

silicon detectorsFE-chips

disk

PG-connections blocks

heat spreader

BeO hybrid

large flow ectronics cooling channel 4W

small flow detector cooling channel 1 W

quartz fan-ins

PG = Pyrolythic Graphite therm 300 -700 W / m KR

Z


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H


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CP-Violation

UT, Enschede, 11/11/'97Research & Education Program, Bob van Eijk1 presented by Bob van Eijk BAC...

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