Tracker Alignment System Progress Laser runs with inner tracker

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Tracker Alignment System ProgressLaser runs
with inner tracker FM electronicsFM Production
QM (4) validation of Laser hardware

• W. Wallraff, RWTH Aachen
• AMS TIM
• CERN
• April 23, 2007 v1a

HDwbk/Users/wolfgang/Desktop/TAS_at_wbk/forRoberto07i
07/08i07_TAS_TIM_3a.ppt (17771008 Jan 8 0834 )
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Outline
Outline Introduction Geneva Laser Test Runs
with Inner Tracker (iii 07) SuK FM production of
LBBX LFCR LFIB AC TVT with M-Crate, LFCR,
LCTL Summary
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TAS components
TAS properties Light weight (3 kg) Low power (lt
0.1 W) Fast data taking (20s) Highly accurate (lt
5µm)
On TRD M-structure
Low power laser diodes 100 nJ pulses are
sufficent for observing signals in 8 successive
layer
Antireflective coating mandatory nSi 3
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plane 4 at Geneva before installation into inner
tracker
Laser access
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10
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From Divic 24x05
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Inner tracker at Geneva University
Inner Tracker in clean area at Geneva University
Plane 2 3
Goal 10µm stability over 1 m3 volume All times!
Plane 4 5
Plane 6 7
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Laser source underneath Inner Tracker
5 axis laser positioning (manual)
Laser Optics on sliding support Can switch
between laser roads with ease. Initial
adjustement difficult! No Outer Plate
Cables unfolded for test
Optical fibre flight type
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Laser beam behind 6 Si sensors from Inner Tracker
5 of the 10 roads were checked in Dec. 2006 and
found to be within the specs (.5mm)
4.5 mm Grid spacing
No camera any more !!
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Beam profile integrals while moving in x with
yconst.
Nominally the laser roads are 6mm wide. So there
are approx. 1mm wide margins on either side of
the beams. A substantial effort is needed to fire
the laser at the right angle wrt the tracker
structure.
Also in view of using the star tracker Check of
the Global Tracker Metrology!
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Tracker DAQ Crew - Thank You
15 runs, 4000 evts each Mixed data (cluster
raw) At 2 roads Altogether 4 locations (the very
minimum)
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Laser Beam y-Displacement - single shots (y)
Laser Road Limits
Y-view
iLaser 25mA Tpulse 1 µs Frep 5Hz
Flight tracker! QM2 Laser as well as Tracker
electronics
110 µm strip spacing
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Laser Beam y-Displacement - single shots (x)
Laser Road Limits
Precise alignment of beams (directions) very
important
208 µm strip spacing
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Laser Beam Port Box
Cold plate
Temperature sensor
from LFCR
LBBX sending 4 (2) beams to the outside (optical
window)
no shear protection of fibre and ferule
bottom/top plate
to tracker
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LBBX FM (Ti)
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LBBX alignment of beams at SuK
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LBBX datasheet from alignment at SuK
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TVT cold plate with LFCR 2 LBBX 1
Spy lines 34
LFCR 2 (2 Lasers)
Life testing of TAS optical components angular
and positional stability, power
Temperature sensors readout
Optical fibres connecting the LFCR and the LBBX
Spy lines 12
LBBX 1
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Laser beam intensity position during TVT
The loss in output power is real and was expected
The position change is due to the contraction of
the cold plate supporting the laser optics. Since
altogether 4 beams were observed this will be
corrected for
400 x 400 px (2.24 x 2.24 mm)
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Summary 23iv07
With the 6 Si-planes of the inner Tracker Laser
beams have been successfully recorded on 2 roads.
The Si was read using QM2 tracker electronics
(T-crate). The Laser was driven using QM2 Laser
Modules (LFCR, LBBX , M-crate)
Delivery of FM hardware starts this week. All FM
LBBX will be delivered by July 1st (including
FS). LFIB (fibre connections between the LFCR and
LBBX) fixation under discussion with RB, EP, FC.
Design and fabrication SuK RWTH. FM LFCR will
all be delivered by September 15th.
The LBBX are going to be integrated with the
tracker outer plates in July. Beam profiling
equipment for the verification of the beam
directions is still missing - use PG miniladder?
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Diaphragm test
There will be no readout of any mounted tracker
ladder up to the finished instal-lation into the
detector
The diaphragm test has to rely on separate Laser
beam diagnostics Finally my Geneva colleagues
will turn on the TDRs (thank you)
This issue is currently revisited, laser run in
January, cosmics in February 2007
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LFCR 1 on cold plate
High quality optical connections are mandatory We
may be forced to use cable savers
Only preliminary analysis available at this time
Diode Fiber Couplers
Electrical inputs
At low (lt - 30C) temperature the laser power is
only 40 from what is available above 10 C
Optical outputs
Temperature sensors
The optical power reserve based on the diode
performance and the pulsing system can cope with
this variation
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Ti optics
electro optical adaptor (1 OD) made from
Titanium
focusing control
fibre output (FC)
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WW running the TVT (Jan 6th 2007, 1630)
TVT vessel
TVT temperature control
Laser power control
Laser DAQ
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M-crate (LDDRLCTL) set up (AC electronics
group, 21xii06)
LFCR
M-Crate
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Vib test (1) M-Crate 03 Jan 07 (run by the
Aachen space engineering experts)
The crate worked through the full test cycle! An
important step towards flight readiness
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Summary 08i07
5 of 10 laser roads have been successfully tested
(100 µm precision). The Geneva assembly crew has
done its job! Many thanks
Successful TVT test (20 µm precision)for 1 LBBX
2 LFCR (8 30 of deliverables) (60 power
drop as expected for - 35 C)
Successful vibration test of the QM M-crate
(might be promoted FS)
For system success TAS installation will require
Global Tracker Geometry information (i.e. more
verifications of the as built geometry)
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LFCR splitters fixed on TRD M (under MLI)
EM German Silver
To LBBX on upper (lower) tracker flange
QM Titanium
From LDDR in M-Crate
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Laser beams out of outer plate
Outer plate seen from the inside of the tracker
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TAS beamholes (roads)
2 lanes/road
6.75mm
10.5mm

4
3
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ARwafer
AMS alignment Si sensors Double sided 110(27.5)
µm y (B) Readout/metallization(implantation)
pitch 208(104) µm x (B) readout(implantation/me
tallization) pitch (ohmic side) high resistivity
(gt6kW) 300 µm thickness Biassing by punch through
low rate, low rad. load (i.e. LEP style)
design 8m2
2000(40) sensors (AR) the largest operational Si
detector built so far