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RASNIK middle scale test
at NIKHEF
Michał Jankowski
Krzysztof Syryczyński
Soltan Institute for Nuclear Studies
2005/06/08
CERN LHCb Week
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RASNIK
PVSS
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C-frame at NIKHEF - March ‘05
6050 mm
4000 mm
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Installation
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Mask placement
Final position – inside the C-frame
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Telescope = lens + CCD
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Software
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DAQ software
makes bit-map from video signal
Frame grabber
DT3162 driver
calculates x, y, z
controls everything
RASDIM server
(containing
Analysis240.dll library)
PVSS client
MySQL database
(external data storage)
Graphical
presentation
of the latest position
(IN FUTURE)
plots in a new
PVSS panel
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Rasdim server by Robert Hart
• RASNIK multiplexing
• Image acquisition directly from driver
• Analysis in external dll library
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PVSS client by Robert Hart
Small
changes
are possible
for LHCb OT
to remove
detectors
we don’t have
Main Console
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PVSS client by Robert Hart (user layer)
Sequence selection
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for choosing in which order channels are read out
PVSS client by Robert Hart (user layer)
Channel parameters window – for choosing channel by multiplexers
and for defining distances, CCD and mask sizes etc.
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Java RASNIK data analysis program
by Michał Jankowski
x, y – movement of
RASNIK mask in
its coordinates
scale = magnification =
distance(lens, CCD)

distance(lens, mask)
Plotting channel positions in time
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Results
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RASNIK lines on the C-frame
0
YLAB
1
ZLAB
XLAB
4
from RASNIK to LAB coordinates
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2
• 5 lines were installed
XLAB=
+Y0
+X1
+X2
-X3
-Z4
YLAB =
+X0
+Y1
+Y2
+Y3
-Y4
ZLAB =
+Z0
+Z1
+Z2
+Z3
+X4
line
focal
length
f [mm]
distance
lens-mask
[mm]
distance
lens-CCD
[mm]
0-3
70
140
140
4
104
388
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• data is stored in MySQL database.
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Temperature & Length changes
Lup
Tup
Tdown
Temperature measured on top and bottom of C-frame
Ldown
We observe
thermal expansion
of C-frame.
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Length of horizontal parts of C-frame
movements of C-frame corners
against steel pillars during 60 hours
0
•
•
1
On upper lines 0 & 1 mainly thermal expansion in opposite directions
horizontal movement in the same direction on bottom lines 2 & 3.
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3
2
Stability of the module – RASNIK results
module connected
by polystyrene bar
free module
to other modules laser
measurement
module disconnected
Movement in Z of middle of long module in respect of C-frame during 8 days.
• movement <200 µm of free module, confirm laser measurements: see note “Module flatness”.
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• bigger movements with polystyrene bar (it was during laser measurement of C-frame flatness)
RASNIK measurements
for period of laser measurement 9th April 1230-1830
Hmiddle
Hside
Lup
Z
Ldown
Z of middle of 5m long module type F.
On line 4 “Z” is perpendicular to optical axis,
it is measured with precision of order of 1µm.
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Lup
Hmiddle
Hside
RASNIK measurements - weekend 30th April – 1st May
Z
Ldown
Z of middle of 5m long module type F.
On line 4 “Z” is perpendicular to optical axis,
It is measured with precision of order of 1µm.
No correlation between module bending and
changes of length of C-frame sides “Hside”.
Thus no correlation between module bending
and temperature.
Fast changes of C-frame height in the middle
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(y,z)
Hmiddle
Hside
RASNIK measurements - weekend 30th April – 1st May
Z and Y of middle of
5m long module type F.
75 µm
see on plots:
2 * (-y4)
 Hside
2 * 2.7m * |Al-module| * T  5.5m * |Al-Fe|* T’
y4 is up, so
Al - module

Al-Fe
coefficient of linear expansion of module
is close to normal steel.
150 µm
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Range of RASNIK
“half” range 3mm
on test lines
in future on same lines
mask 20 mm
2.5
seen by CCD
11.5 mm
CCD
4.6 mm
1
perfect mask 18 mm
RASNIK measures better when full surface of CCD sees mask.
minimal magnification on our lines 1/ 2.5
minimum:
full segment
9*9 of
340µm squares
(if 18*18 fields seen
segment is seen)
minimum  6.1mm
1mm in the shadow of mask mount
(small distortion of the edge of image)
magnification = 1
 range +- 7mm easy 
magnification = 1/ 2.5  range +- 3mm 
This 3mm range should be used for measurement of movement of the C-frame.
Holes in rails and pillars for mounting telescopes should be prepared with precision of
about 1mm.
Tuning sharpness – now more adjustments than needed.
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Movement of only CCD in Z is sufficient. Movement of lens has little use,
so “telescopes” will be simplified.
Conclusions
• Installation of 5 RASNIK lines completed successfully
• Full surfaces of all CCDs see mask on all 4 lines.
• Precision σx  σy  1µm, σz  100µm
• Telescopes will be simplified.
• PVSS client is user friendly, should be adapted to OT needs
• Test
results show that 4 RASNIK lines monitor thermal
expansion of C-frame with sufficient precision
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