Tracker Alignment System Progress 3dimensional position control EM

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Tracker Alignment System Progress3-dimensional
position controlEM QM production of Laser
hardware

• AMS TIM Geneva
• W. Wallraff
• RWTH Aachen
• April 25, 2006

/Desktop/TAS_at_wbk/gtTASpresentations/01ii06_TASwwTI
M_1c.ppt_10713088 31 Jan 2334
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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
3
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
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Order of Modules in M-Crate

• The Laser Electronics is located in M-Crate
• It consists of 6 boards
• 5 LDDR (laser diode driver)
• 1 LCTL (trigger distribution)
• Each LDDR drives two laser diodes
• The Laser system is controlled by two USCMs
• There are 3 additional modules in M-Crate
• 1xGPS module
• 2xASTE

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Block Diagram of LDDR
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LDDR Board

• Power consumption of LDDR
• digital part 5V_at_ 170 mA
• analogue part 5V_at_ from almost 0 to 200 mA

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Status of the LDDR Boards

• A full set of LDDR and LCTL QM2 has been produced
  and electrically tested
• The TVT and Vibration tests are in preparation
• the test will be performed by RWTH engineering
  (KL)
• test procedure according to AMS2 rules
• test sequence vibration, TVT
• all test will be performed with power on
• the status of the boards will be controlled
  during the tests
• All parts for FM production are in hand
• The tests will include the M-crate and its
  backplane
• It is understood that the power supplies as well
  as the other units (GPS, Startracker, ) in the
  M-crate will be tested by the CERN AMS
  electronics group or subcontractors thereof.

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TAS optical system components
In a laser run any 2 from the 10 Laser diodes can
be activated firing 8 fibres from 40 resulting in
laser signals on 4 of the 5 AR ladders
The activation pattern determines whether the
beams go up or down
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LFCR splitters fixed on TRD M (under MLI)
EM German Silver
QM Titanium
To LBBX on upper (lower) tracker flange
From LDDR in M-Crate
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LFCR laser diode optics
QM base material Titanium
QM 2 Dallas sensors
1 to 4 splitter
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LFCR EM12
EM2 used for system test
LFCR box grounding Connected to M- Crate
1 to 4 splitter
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weight reduction
Dallas sensors
QM 2 193 g
EM 3 241 g
Diagnostics Driver
Fibre output (FC!) Caps will be wired together
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weight reduction 2
The fibres inside the FC connectors have to align
with very high precision (lt 1µm)
Dallas sensor support
Laser control photodiode connector
fixation hole
total LFCR weight 350g
internal fibre support
fixation hole
fixation hole
electro optical adaptor casing machined from
titanium
EM to QM 30 weight reduction by improvement of
mech. design
LFCR frame (QM) with 1 coupler and no splitters
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Ti optics
electro optical adaptor (1 OD) made from
Titanium
focusing control
fibre output (FC)
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Laser Beam Port Box
from LFCR
LBBX (EM) protruding 9mm above the the tracker
outer plates
no shear protection of fibre and ferule
bottom/top plate
to tracker
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LFCR 1
6m fibre cables
LFCR (EM)
TAS system test at SuK March 2006
LBBX (EM)
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EM system test
Reasonable alignment for 3 out of 4 rays
converter target
LBBX
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LBBX EM
LBBX front
Mirrors (Au on ceramics)
LBBX back
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LBBX QM
LBBX in between tracker ToF
Shear protection baignoire interface will be
checked by E.P W.W. later this week
ToF envelop including MLI ? (in tracker center)
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Baignoires for LBBXs
Delivery first 2 LBBX end April. 2006
on Tracker Outer Plate
Conical flanges modified (IPT Aachen), shipped to
Geneva June 2005 trial assy with inner- end
plates.
Check here !
IR feed lines
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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

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3
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plane 4 dressed
Laser access
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9
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10
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From Divic 24x05
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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
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Tests _at_ RWTH
lightweight, lowcost 6 µm 352 x 288 pixel CCD
camera 2.2 x 1.8 mm (from China)
Beam profile tester RWTH Aachen
AMS-01 LFCR
Laser optics support and fibre feed
small area but probably sufficient Laser profiles
have been recorded
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IR profile and 2D interference pattern with GSE
AR Si sensor
Screen shows IR laser profile with interference
patterns from the AMS Si sensor (AR!!) readout
strips
Beam profiler support (v0)
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large area high resolution IR beam diagnostics
mediumweight, 5.4 µm 3448 x 2574 pixel commercial
CCD camera 19.7 x 15.04 mm (produced in China
by Kodak Olympus)
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Subthreshold Laser profiles
Beam profiles at 4 Laser currents observed with
the Olympus E500
Analysis Results in 2 - 3 weeks Beam centering at
5µm precision over an area of 2 by 1.5 cm ! No
compression artefacts
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Time line
Updated by ww 25 iv 06
LBBX from SuK EM (including test
gear) 03iii06 TVT1 (RWTH, including signal
transfer out of vac.) 15v06 Vib 01vi06 T
VT2 08iv06 check on inner tracker
gt01vi06 FM production (lot
1) 24v06 FM lot 1 tests 23vi06 FM
production (lot 2) 17vii06 FM complete test
with flight fibres and
LFCR/LDDR 01ix06
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LFCR timeline
LFCR from SuK EM (including test
gear) 03iii06 from SuK QM 11iv06 TVT1
(including signal transfer out of
vac.) 18v06 Vib 19v06 TVT2 01vi06
check with LFCR M - crate 19vi06 FM
production (lot 1) 24vi06 FM lot 1 tests
23vii06 FM production (lot 2
) 28vii06 FM complete test with flight
fibres and LBBX 01ix06
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TAS summary
summary

• innovative nonintrusive 3D alignment control
  method (sigx/y 5µm, sigz 50µm)
• AMS is the technology leader in Laser alignment
  control Its approach has been adopted (after the
  AMS-01 success) by the largest Si detector on
  ground CMS at the CERN LHC
• Can be used even if the standard readout is
  unavailable
• prototype for IR profiling in the tracker
  environment developed
• (not using the Tracker electronics), may be
  used for tracker stability verification
• after mechanical operations.
• Laser intensity very low, no danger for
  astronauts
• QM hardware being finished at the vendor for Vib
  TVT tests in v/vi - 06
• flight hardware expected to be completely
  delivered by ix-06