Changeable Sheet A.Ariga, Nagoya univ. CS strategy R&D~2004-Oct –BG rejection Distortiondistortion...
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Transcript of Changeable Sheet A.Ariga, Nagoya univ. CS strategy R&D~2004-Oct –BG rejection Distortiondistortion...
![Page 1: Changeable Sheet A.Ariga, Nagoya univ. CS strategy R&D~2004-Oct –BG rejection Distortiondistortion itself, precise measurement, packing Self-Refreshparameter.](https://reader035.fdocuments.in/reader035/viewer/2022062803/56649f4f5503460f94c708a7/html5/thumbnails/1.jpg)
Changeable Sheet
A.Ariga , Nagoya univ
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CS strategy• R&D ~2004-Oct
– BG rejection• Distortion distortion itself, precise measurement,
packing• Self-Refresh parameter study
– Aging test at high humidity• sensitivity , fog , etc.
• CS packing machine development ~2004-May• Production 2005-May ~ 1000CS/day
– Humid packing at Nagoya.– Initialization at Gran Sasso (self-refresh acceleration,
30degC 1month etc).
• Install– BAM,BMS
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BG rejection by Microtrack-angle resolution improvement.
NBG (θ∝ allowance)4
Distortion Study
θallowance is decided by distortion. at present, maximum 50mrad.
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Distortion study for CS.• How can we make good quality CS stably?
– must study develop on the view of distortion.
• Measures against...– Stripe distortion in FIX.– Reticulation in STOP.– Bubbles in Wash.– Glycerin non-uniformity.
• the limit of stage error.
![Page 5: Changeable Sheet A.Ariga, Nagoya univ. CS strategy R&D~2004-Oct –BG rejection Distortiondistortion itself, precise measurement, packing Self-Refreshparameter.](https://reader035.fdocuments.in/reader035/viewer/2022062803/56649f4f5503460f94c708a7/html5/thumbnails/5.jpg)
Test Sample• film
– Non-Refreshed
– Refreshed
• exposure– 2GeV pion at KEK
– ~105 particle / cm2
low humidity packed
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Stripe shape Distortion
4mm
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Distortion by Stripe of emulsion surface.
Position X
x =
Mic
rotr
ack -
B
aset
rack
Amplitude = 10mrad
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Direction of Stripe
it depends on the direction in Fix solution.
it is created by convective effect.
down in FIX solutions
disappeared when swing emulsion in FIX. (or circulation).
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Reticulation on emulsion surface.
5mm
these pictures show surface of emulsion developed by usual recipe.
such non-uniformity is clearly bad.
and this make the wettability high, bad for drying.
these roughness was caused by STOP solution, especially with hardener Al2(SO4)3.
Disappeared by removing hardener in STOP.
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Bubble distortion
9mm
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Air bubbles in wash
water
this is veryveryvery heavy air bubbles. usually the size is <~ 0.1mm.
10mm
Use degassed water (not only wash)
Side view
less water circulation in this area.
bubble
emulsion
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Glycerin non-uniformity.
Averaged in 300 micron
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glycerin non-uniformity• To remove this non-uniformity
– alcohol+glycerin solution glycerin solution.– no use of drywell– remove glycerin solution completely by surface
tension before drying.
Glycerin solution
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Distortion map after whole care...But
averaged in 200micron square.
mean x = -4.2mrad
x = 1.8mrad
mean y = -0.7mrad
y = 1.8mrad
Global distortion remained!
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Distortion map after whole care.
stage X
stage Y
scanned 1.3mm x 1mm x 99point
on the stage
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Rotate plate on the stage.
stag
e X
stag
e Y
on the stage
Global distortion looks correlated to how the emulsion sheet placed on the stage
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origin of global distortion correlated to the stage.
z-axis stagger CCD
CCD camera move
we must develop blade spring type Z-drive (future plan)
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Distortion on one plate.
x=1.5mrad y=1.6mrad
scanned 1mm x 1.3mm x 99point
believe only angle y (stage coordinate) and plot
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Distortion map after correction
x = 1.8mrad
y = 1.8mrad
measurement err~1.2mrad
averaged in 200mm square.
(~=24tracks)
9mm
averaged in 200micron square.
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But, the other side.• the distortion plotted before is only objective lens side.
Stage side distortion is still remained.
Develop a way to make emulsion itself hard.
or the other way.
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Summary • Distortion is removed intrinsically.
– at the level of < 2mrad.
– Now observed distortion is dominated by the stage accuracy and measurement.
Future plan•About distortion
–Packing solution & mechanical stress.–a high precision stage must be developed to go further. –the way to make emulsion hard must be developed.
•About whole CS–sensitivity of high humidity pack–Aging–BG estimation