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26 June 2001 VELO-Overview
VELO Overview
T. Bowcock
University of Liverpool
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26 June 2001 VELO-Overview
Post-TDR
• Hardware
• Software
• Critical Issues
• Summary
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26 June 2001 VELO-Overview
Hardware
• Sensors
• Hybrids
• Thermo-Mechanical Module
• Testbeam
• Production Facilities
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26 June 2001 VELO-Overview
Hardware: Sensors (1)
• Two types of sensors produced– Hamamatsu (n+n)- 1998– Micron (p+n) 2000
• In fabrication (mask design at L’pool)– Micron (n+n) 2001
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26 June 2001 VELO-Overview
Hardware: Sensors (2)
• Laboratory– High precision tests with 1060nm lasers for
both sets of detectors (LHCb note)
• Testbeam at CERN– Under preparation for 2001
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
Hardware: Sensors (3)
• Additional test equipment – Cosmic ray facility – now commissioned
• Shorter wavelength laser (900nm)– Ordered
• Automated Scanning x-y stage
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26 June 2001 VELO-Overview
Hardware: Sensors (4)
• Simulation complete– First principle analysis of leakage currents and
charge collection as a function voltage
• Agreement with data– Note low voltage phenomena <20V Q/I
amplifiers.
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26 June 2001 VELO-Overview
Hardware: Sensors (5)
• Identify manufactures for Production– Hamamatsu (withdrawn n+n option)– Micron (n+n, p+n)– CSEM, Eurysis, SEIKO, SINTEF, ST
• Technical discussions Price Enquiry
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26 June 2001 VELO-Overview
Hardware: Hybrids(1)
• Hybrid Design&Production to IDE– Delivered – Bonded and mounted with chips– Fan-ins produced– Under test
• 4 chips r/o (26/6)
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26 June 2001 VELO-Overview
Hardware: Hybrids(2)
• Kapton version to be ordered early 7/01
• SCT-VELO design (Liverpool)– improved cable connections– Viable pre-production prototype
• Beetle design
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26 June 2001 VELO-Overview
Hardware: Module(1)
• Thermal models for TDR
• Cooling system– Safety issues addressed
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
0
10
20
30
40
50
60
70
0 5 10 15 20 25
Power
Delta(T)(from nominal)
Calibration ModelCalibration Model
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26 June 2001 VELO-Overview
Chipglue
kaptonsensor
ceramic
TPG
Chipglue
kaptonsensor
TPG
CF weave
CF(UD)
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
Hardware: Module (2)
• Prototype and testing of adjustment
• Re-engineering– Carbon fibre base– O CTE materials including adjustment screws
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26 June 2001 VELO-Overview
Electronics
Cooling Bracket & Fixings
Carbon Fiber Paddle
Micrometer Adjusters
Paddle Base
Flat Spring
Location Base
Substrates
Silicon Detectors
x
y y
z
z
x(pitch)
(roll)
(slew)
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
Hardware: Module (3)
• Curvature of the sensors measured
• We may need to survey (cold?) the modules
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26 June 2001 VELO-Overview
Hardware: Module (4)
Measurement points
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
Hardware: Testbeam
• Module for October 2001– See also software
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26 June 2001 VELO-Overview
Hardware: Production Facilities
• Clean rooms
• Bonding equipment
• Jigs and Assembly– Vacuum compatible glue dispensing
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26 June 2001 VELO-Overview
Production Facilities
LHCb
R&D
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26 June 2001 VELO-Overview
Software
• TDR analysis and optimisation
• Monte Carlo simulations of VELO
• VELO core software (meeting 5/6 July)
• Alignment
• Testbeam
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26 June 2001 VELO-Overview
Software: Optimisation• We generated and analysed over 10m bb
events generated and analysed for different configurations: Physics Section
• Optimisation paper (for TDR) huge effort impossible without substantial effort
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26 June 2001 VELO-Overview
Software: Silicon
• Other (non GEANT software) for optimisation of operating conditions
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
-5-4.9-4.8-4.7-4.6-4.5-4.4-4.3-4.2
0 200 400 600 800
Vop(Volts)
Tem
pe
ratu
re(C
)
(d=200micron,Vdep=70V) (d=200micron,Vdep=31V)
(d=300micron,Vdep=160V) (d=300micron,Vdep=70V)
400
600
800
1000
1200
1400
-20 -10 0 10 20
Tcool(C)
Vd
ep(V
olts
)
Vop=200V
Vop=600V
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
0.00E+00
1.00E-01
2.00E-01
3.00E-01
4.00E-01
5.00E-01
6.00E-01
-20 -10 0 10 20
Temperature (C)
He
at
(W)
Const. Flux(2.1x10**14)
Const.Flux(3.9x10**14)
LHCmodel(2.1x10**14)
LHCmodel(3.9x10**14)
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26 June 2001 VELO-Overview
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26 June 2001 VELO-Overview
Software: Alignment(1)
• Alignment: Underway– From HERA code used by H1 – Fast determination of global parameters– Reduced to linear problem
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26 June 2001 VELO-Overview
Software: Alignment(2)
• Curvature of detectors
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26 June 2001 VELO-Overview
Residuals
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26 June 2001 VELO-Overview
Software: Other
• LHCb production
• LHCb Grid– Testbeam as testbed
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26 June 2001 VELO-Overview
Critical Issues
• Electronics
• Electronics
• Electronics
• Manufacturers for Silicon
• Grid
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26 June 2001 VELO-Overview
Summary
• Sensors
• Hybrid
• Module
• Software