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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

4

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

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)

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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)

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

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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