Practical Statistics – part I ‘Basics Concepts’ W. Verkerke (NIKHEF) Wouter Verkerke, NIKHEF 1.
RASNIK middle scale test at NIKHEF
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Transcript of RASNIK middle scale test at NIKHEF
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RASNIK middle scale test at NIKHEF
Michał Jankowski
Krzysztof SyryczyńskiSoltan Institute for Nuclear Studies
2005/06/08CERN LHCb Week
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RASNIK
PVSS
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C-frame at NIKHEF - March ‘054000 mm
6050
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
Frame grabber DT3162 driver
RASDIM server(containing
Analysis240.dll library)PVSS client
MySQL database (external data storage)
Graphicalpresentation
of the latest position
(IN FUTURE)
makes bit-map from video signal
plots in a new PVSS panel
controls everythingcalculates x, y, z
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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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10Main Console
PVSS client by Robert Hart
Smallchangesare possible for LHCb OTto remove detectors we don’t have
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11Sequence selection
for choosing in which order channels are read out
PVSS client by Robert Hart (user layer)
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Channel parameters window – for choosing channel by multiplexers
and for defining distances, CCD and mask sizes etc.
PVSS client by Robert Hart (user layer)
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13Plotting channel positions in time
Java RASNIK data analysis program by Michał Jankowski
x, y – movement ofRASNIK mask inits coordinates
scale = magnification =
mask) ens,distance(l
CCD) ens,distance(l
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Results
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RASNIK lines on the C-frame0 1
23
4
• 5 lines were installed
• data is stored in MySQL database.
line focal
length
f [mm]
distance
lens-mask
[mm]
distance
lens-CCD
[mm]
0 - 3 70 140 140
4 104 388 142
XLAB
ZLAB
XLAB= +Y0 +X1 +X2 -X3 -Z4
YLAB = +X0 +Y1 +Y2 +Y3 -Y4
ZLAB = +Z0 +Z1 +Z2 +Z3 +X4
YLAB
from RASNIK to LAB coordinates
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Temperature & Length changes
Temperature measured on top and bottom of C-frame
Length of horizontal parts of C-frame
Tdown
Lup
Ldown
Tup
We observe thermal expansion of C-frame.
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movements of C-frame corners against steel pillars during 60 hours
• On upper lines 0 & 1 mainly thermal expansion in opposite directions• horizontal movement in the same direction on bottom lines 2 & 3.
0 1
3 2
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Stability of the module – RASNIK results
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”.• bigger movements with polystyrene bar (it was during laser measurement of C-frame flatness)
free module
module connected by polystyrene barto other modules
module disconnected laser measurement
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RASNIK measurements for period of laser measurement 9th April 1230-
1830
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.
Hsi
de
Lup
Ldown
Hm
idd
le
Z
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RASNIK measurements - weekend 30th April – 1st May
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 andchanges of length of C-frame sides “Hside”.Thus no correlation between module bendingand temperature.
Fast changes of C-frame height in the middle
Hsi
de
Lup
Ldown
Hm
idd
le
Z
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Z and Y of middle of 5m long module type F.
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 moduleis close to normal steel.
75 µm
150 µm
Hsi
de
Hm
idd
le(y,z)
RASNIK measurements - weekend 30th April – 1st May
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Range of RASNIK
on test lines magnification = 1 range +- 7mm easy in future on same lines 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.Movement of only CCD in Z is sufficient. Movement of lens has little use, so “telescopes” will be simplified.
CC
D4.
6 m
m
seen
by
CC
D11
.5 m
m
mas
k 20
mm
1mm in the shadow of mask mount(small distortion of the edge of image)
per
fect
mas
k 18
mm
minimal magnification on our lines 1/ 2.5
1 2.5
“half” range 3mm
RASNIK measures better when full surface of CCD sees mask.
minimum:full segment9*9 of340µm squares(if 18*18 fields seensegment is seen)minimum 6.1mm
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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