RASNIK middle scale test at NIKHEF
description
Transcript of RASNIK middle scale test at NIKHEF
1
RASNIK middle scale test at NIKHEF
Michał Jankowski
Krzysztof SyryczyńskiSoltan Institute for Nuclear Studies
2005/06/08CERN LHCb Week
2
RASNIK
PVSS
3
C-frame at NIKHEF - March ‘054000 mm
6050
mm
4
Installation
5
Mask placement
Final position – inside the C-frame
6
Telescope = lens + CCD
7
Software
8
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
9
Rasdim server by Robert Hart
• RASNIK multiplexing
• Image acquisition directly from driver
• Analysis in external dll library
10Main Console
PVSS client by Robert Hart
Smallchangesare possible for LHCb OTto remove detectors we don’t have
11Sequence selection
for choosing in which order channels are read out
PVSS client by Robert Hart (user layer)
12
Channel parameters window – for choosing channel by multiplexers
and for defining distances, CCD and mask sizes etc.
PVSS client by Robert Hart (user layer)
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
14
Results
15
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
16
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.
17
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
18
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
19
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
20
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
21
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
22
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
23
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