Upload
daria-hunter
View
30
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Research & Education Program. presented by Bob van Eijk BAC Meeting University of Twente 11 November 1997. 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. - PowerPoint PPT Presentation
Citation preview
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
1
presented by
Bob van Eijk
BAC Meeting
University of Twente
11 November 1997
Research & Education Program
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
3
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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
4
The CERN accelerator infrastructure
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
5
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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
6
This is a placeholder for the big ATLAS transparency from the
ATLAS poster page
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
7
- 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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
8
2T solenoidal B-field
Cylindrical volume: 8m3 (2.2m, L=7m)
4<R<16 [cm]
30<R<60 [cm]
60<R<120 [cm]
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
9
140 million channels 2.3 m2 active silicon 14 kW total heat load
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
10
L=1033 cm-2 s-1L=5x1033 cm-2 s-1 (mH = 400 GeV)
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
11
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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
12
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)
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
13
SCT Modules (Barrel)
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
14
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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
15
SCTSignal to Noise
• n-side strips (simulation)• Cstrip = 1.5 pF/cm @ 0 p/cm2
• Cstrip = 1.2 pF/cm @ type inversion
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
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)
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
17
Disk layout: front view
view
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
18
Disk Layout: back view
view
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
19
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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
20
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
21
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
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
22
H
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
23
UT, Enschede, 11/11/'97 Research & Education Program, Bob van Eijk
24
CP-Violation