Transcript Lai_wei_yang_

ALIGNMENT DESIGN AND STATUS
OF TAIWAN PHOTON SOURCE
WEI-YANG LAI
October, 2014
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Introduction
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Taiwan Photon Source (TPS) is a new 3-GeV synchrotron ring with circumference 518.4 m
and 24 double-bend cells
Due to the stability consideration, the entire building is constructed half underground at
depth 12 m relative to Taiwan Light Source (TLS)
For the stability of ground, the building is established on the concrete floor with more than
1m in depth. For the requirement of construction, the concrete floor is constructed 6 times
until it is done. The last one area was constructed on June 2012
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GPS fiducial points
Variation ofTPS
the GPS
fiducial points
GPS 主控點座標比較圖(含全套管基樁)
5.0
4.0
3.0
2.0
Err: mm
1.0
GNET2010-11-23
GNET2011-07-11
GNET2011-07-26
GNET2011-08-08
GNET2011-09-06
GNET2011-11-15
GNET2011-12-27
GNET2012-03-30
GNET2012-07-09
GNET2012-09-17
GNET2013-02-20
GNET2013-10-31
0.0
-1.0
-2.0
-3.0
-4.0
GPS15-H
GPS15-N
GPS15-E
GPS14-H
GPS14-N
GPS14-E
GPS13-H
GPS13-N
GPS13-E
GPS12-H
GPS12-N
GPS12-E
GPS11-H
GPS11-N
GPS11-E
GPS10-H
GPS10-N
GPS9-H
GPS10-E
GPS9-N
GPS9-E
GPS8-H
GPS8-N
GPS8-E
-5.0
Point No.
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Before the construction, there are only 4 fiducial points of GPS on the roof of buildings.
After the TPS started to be constructed, the 4 fiducial points were shifted due to the slight tilt of
building
For this reason; we increase 4 new fiducial points
The 4 new fiducial points were inlaid in the laccoliths, and the inserted depth is up to 5m.
Considering the variation of outdoor temperature, the fiducial points of GPS are made by granite
to reduce the effect of thermal expansion.
After one and half year of construction, the fiducial points of GPS seem to be stable within 2mm
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Survey network of GPS
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In the beginning of the construction, we installed 36 granite pillars as the initial survey network of
the TPS.
The 36 granite pillars include 12 pillars in the storage ring and 24 pillars in the experiment area.
These granite pillars need to be surveyed by GPS system before the roof of the building has started to
be constructed.
The granite pillars and the GPS fiducial points were surveyed together by the GPS, and the accuracy
of that is less than 1mm
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The initial survey control network
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When the roof of TPS building has completed, the survey through GPS is not available. Therefore,
several windows installed on the inner wall of TPS are available for surveying. We can then obtain
the initial survey control network by integrating the survey data obtained from the GPS and the out
door laser tracker.
A initial survey control network is used for the fundamental construction. (construction of
building ,the shielding wall, pipe tray)
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The survey control network of TPS
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There are two survey holes on each shielding wall, and the survey targets are installed on the two side
of the wall, so that the storage ring and the experiment area could be merged by this survey targets.
The windows installed on the inner wall can provide the chord length to correct the error propagation
from the restricted geometry of the TPS ring
the TPS network in the altitude direction is corrected by using precise levelling instrument (DNA03)
The difference between twice survey network is 0.5mm(±0.5mm)(two week)
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Installation of TPS
frame
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The cement ceiling were removed and been placed on the experiment area from October
2013 to May 2014 because of the requirement of installation and repair of the cement
ceiling.
We cant merge the experiment and storage ring area through the survey holes on the
shielding wall.
The difference between twice survey network is 1mm(±1mm)(two week) if the area of
survey network only contain the storage ring.
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Variation of TPS in radial direction
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The adjustment girders is still
within 1mm on May 2014.
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The number 6 area is the last one area constructed on June
2012 ,and we record the survey data from July 2012 until now.
According to these data base, the thermal expansion of TPS
should be about 0.3mm per ℃
We aligned components by these survey control network, and
we also consider the temperature of the control network to
align the components.
After the air condition is operated and let temperature be 25 ℃
, the variation of the building affected by temperature seems
smaller than before
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Alignment in TPS
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There are three laser trackers in NSRRC.(Leica AT901 ,FARO Xi, Leica AT401)
We align a lot of components within 0.1~0.2 mm according to the survey control
network (girders ,pedestals, vacuum chamber ,FE element, magnets, BPM, supports )
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Alignment of screws and screw holes
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All the screw holes and screws of the storage ring need to be set up by the survey control
network
First, We set out an ink line with marks by a laser tracker
The contractor drilled the hole roughly according to this marks
Glue was injected into holes for bonding the screws on the ground and screw holes on the wall
We design templates to align screws and screw holes after the glue being injected, and we could
position the screws and screw holes by using a laser tracker
After the glue is dry and solidified, the accurately of them are within 2mm.
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Installation of TPS
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After the screws and screw holes are
completed, we install pedestals by using
electric lift craft
We align all pedestals by using laser
trackers
We inject the cement into pedestals
After the cement being solid, we can
install the girders with the magnets
Finally, we can adjust the girder system
by the auto-alignment system
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Auto-alignment process of TPS
GnL ( X , Y , Z )1  {[ G( n 1) R ( X , Y , Z )i  W ( S( n 1) n ( X , Y , Z ))
We obtained the Initial
coordinates by using a laser
tracker
 (1  W )[GnL ( X , Y , Z )i  G( n 1) R ( X , Y , Z )i ]]
S ( X ,Y , Z )
( n1) n
Obtain the relative position and
angle between girders from sensors
(PSD, touch sensor modulus)
Compute the new coordinates
and adjustment of girders
Are the transverse and
rotation less than 10um
2.5urad
no
Adjust girders by tuning cam
movers
Get the movement of girders
from touch sensors
Get the coordinates of girders
after tuning movers
G( n1) L ( X , Y , Z ) 0
Sn ( X , Y , Z )
 [GnR ( X , Y , Z )i  WS n ( X , Y , Z )i
 (1  W )[GnR ( X , Y , Z )i  GnL ( X , Y , Z )i ]]} / 2
G( n1) R ( X , Y , Z )0
G ( X ,Y , Z )
(n) L
yes
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Recorder all data
of sensors
Finish auto-alignment
process
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G( n) R ( X , Y , Z )0
The new position of each fiducial point of girders is
computed from the positions of two near points
and the relative position between two points from
touch sensor modulus and PSD system .
The new coordinates are established under a
condition that the sensor accuracy is better than
laser tracker, so the accuracy of new coordinates
can be improved.
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Construction of one cell in TPS
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Heidenhain rotary encoder
ECN425
Heidenhain length gauge
ST1208
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Leica Nevil220 tilting
sensor
There are 16 touch sensor in a cell, and among of that 5 touch
sensors are set on a touch sensors modulus, and 3 touch
sensors are installed in the end of section.
The position of girders can be recorded by theses touch
sensors.
There is a tilting sensor on each girder, and we use the
Nivel220 to record the direction of pitch and roll.
Between the straight-section girders, the relative position
could be recorded by a laser-PSD.
Touch sensors modulus
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Construction of girder system
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There are 3 pedestals, 6 cam mover, 6 locking system, 12
damper for a girder
The locking system could increase the nature frequency.
The damper could reduce the amplifier
The ratio of gear reducer : 160:1
Cam shaft offset : 7mm
The adjusting range is about 4.5mm
The torque of motors is 4 N-m, and the adjusting system can
sustain the object upto 20 ton.
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Testing result of girder system
All magnet assembling reference channels
are measured : around 8~12um
The 1st NF can be raised to 33 with
locking mechanisms
The Peak amplitude is
reduced with dampers
Coordinate measuring machine
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The PSD system of TPS
The relative position between two girders in a straight-section could be established by PSD
system.
We can adjust the
class window, and let
the laser light in the
origin path.
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The resolution of Photon sensitive device (PSD) is 0.5 um
The drift of laser could be corrected by the equation below
PSD3=PSD1+L2*tan(θ) PSD4=PSD1+L3*tan(θ) θ=tan-1[(PSD2-PSD1)/ L1]
L1: distance between PSD1 and PSD2 , L2: distance between PSD1 and PSD3 ,
L3: distance between PSD1 and PSD4
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In the transport and installation of girders (from
assembling Lab into the storage ring of TPS), most of
the PSD modulus are shifted. So, we use relative
position from a laser tracker to replace them at present
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Length measurement of TPS
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The relative position between two near girders could be
established by touch sensor modulus
it was constructed by the length and angles.
θ3
θ1
θ2
L
(X,Y)
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The length of girders are measured by laser interference, and the
length between two near girders are measured by length gauge.
Some of them are also shifted in the transport and installation of
girders, and we have re-measured the length
Some of the difference of angle(θ3- θ1- θ2) are still around 100 urad
We correct the length to meet the condition
The correction of value is around 10~20um
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Error equation
If the error of length is 20 um
Eth3=71urad
Eth2=76urad
Eth1=35urad
Error=116urad
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Summary
• Before the air condition is operated, the thermal
expansion ratio of TPS is about 0.3mm per ℃
• The auto-alignment system is operated smoothly ,and
the time of adjustment is half hour per round
(adjustment is 1mm)
• The PSD system in a straight-section needs to be
measured again.
• The accuracy of length of touch sensors modulus
seems to be 20 um, and it needs to be confirmed and
improved.
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THANKS FOR YOUR ATTENTION
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• [email protected]
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