Gluing machine (scanning at the edge…) G. Sirri for Bologna Group.
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Transcript of Gluing machine (scanning at the edge…) G. Sirri for Bologna Group.
![Page 1: Gluing machine (scanning at the edge…) G. Sirri for Bologna Group.](https://reader035.fdocuments.us/reader035/viewer/2022062804/5697bf891a28abf838c8a399/html5/thumbnails/1.jpg)
Gluing machine (scanning at the edge…)
G. Sirri for Bologna Group
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G.Sirri – INFN Bologna LNGS 2008-04-03
Intro Whole emulsion area scanning with ESS has been long
discussed. Several R&D has been carried out.
Currently the best solution is to glue the emulsions to an adhesive tape.
This solution allows better working condition also for the plate exchanger.
To be safe for the incoming run, the current suggested strategy is to glue ALL the emulsions.
However, this solution implies remarkable extra work (and cost).
2/7
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G.Sirri – INFN Bologna LNGS 2008-04-033/7
Gluing machine
A semi automatic machine to glue emulsion plate on adhesive tape realized by CONMED is now at LNGS.
The output of this machine is a continuous stream of emulsion plates.
Before scanning with ESS, the stream are to be cut to separate plates.
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G.Sirri – INFN Bologna LNGS 2008-04-034/7
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G.Sirri – INFN Bologna LNGS 2008-04-03
Emulsion
Gluing machine – PVC Frame Solution130
15
Best setup obtained using rigid PVC frames:
Same thickness as emulsion Quite accurate positioning of the corner (validation is in progress). No precise cutting tool required. Emulsion and PVC frame must be manually pre-aligned before gluing. Plastic frames provided by external manufacturer.
CAVEAT: all the operation must be executed in (suitably) clean room to avoid to glue also dust and impurities.
PVC frame
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G.Sirri – INFN Bologna LNGS 2008-04-03
Costs and operational times
Gluing machine (duplicate): 8 k€ [6.5 k€ (> 5)]
Tapes and Frames:Acrylic adhesive tape (Nitto Tape NI 3161B):~ 15 euro/brick PVC frame (300 micron) already cut: ~ 4 euro/brick
Operational time (1 person):preparation + gluing + (manual) cut: ~ 30 min/brick
ESS update (~25 vacuum support): ~ 10 k€
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G.Sirri – INFN Bologna LNGS 2008-04-037/7
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2008-04-032008-04-03
Edge Scanning:Edge Scanning:resolutions, efficiencies resolutions, efficiencies
distortions using new distortions using new plates setting for the ESSplates setting for the ESS
M.Cozzi (Bologna Group)
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Data set: 7 consecutive plates (Single Ref) Data set: 7 consecutive plates (Single Ref) exposed @CERN July07 10 GeV pionsexposed @CERN July07 10 GeV pions
s.eY
s.eX
99800
40000
-70000-50000
Scanning area: 2X6 cm2
2 zones selected:
1. Central
2. “edge”
to study:
• scanning quality (distortions)
• base-track efficiency
For different vacuum plate system
60000
90000
3 vaccum systems have been tested:
• Standard plate with vacuum pipe
• Vacuum plate with holes
• Large vacuum pipe with emulsion glued on a tape
Central zone: 2x2 cm2
Edge Zone: 1x2 cm2
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Vacuum plates: Vacuum plates: geometry description geometry description
Standard vacuum plateVacuum plate with holes
Glued emulsion larger vacuum pipe= Edge zone ACQ
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Standard vacuum plateStandard vacuum plate
Vacuum pipe
Outside the vacuum pipe the emulsion is bend!
s.eY>97500
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Vacuum plate with holesVacuum plate with holes
Outside the vacuum holes the emulsion is bend!
Vacuum holes
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Glued emulsionGlued emulsion
The emulsion is flat until the edge!
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Base-track densityBase-track densityGlued emulsion
Standard vacuum plate
Vacuum plate with holes
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Micro-track resolution Micro-track resolution Central zoneCentral zone
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Micro-track resolution Micro-track resolution edge zoneedge zone
Glued Emulsion: best resolution (and same as the central zone)
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Base-track resolutionBase-track resolutioncentral zonecentral zone
Central zone (2x2 cm2)
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Base-track resolutionBase-track resolutionEdge zoneEdge zone
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Efficiency – data setEfficiency – data set
Glued
Glued
48
4645
44
43
Eff = N7/(N6+N7)
Exposure angles (rad)
Glued
42
41
Glued
Standard vacuum pipe
48
4645
44
43
Glued
42
41
Glued
Vacuum with holes
Glued
Efficiency have been evaluated on plate 44 for 3 different ACQ setting:
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Efficiency pl44 – central zoneEfficiency pl44 – central zone
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Efficiency pl44 – “edge” zoneEfficiency pl44 – “edge” zone
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DistortionsDistortions
50 micron
D (micron)
^
50 (atan atan )TOP BASEx X XD m i
uur
^
50 (atan atan )TOP BASEy y yD m j
uur
In this calculation we considered only linear distortions. In this approximation we compute the vector D using the following formulas:
x yD D D ur uur uur
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Background rejectionBackground rejection
s.eW>14
Large background even after the angular cut around the beam exposure.The “quality cut” eCHI2P vs s.eW cannot be used Quality cut for distortion copmputations: s.eW >14
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Distortion near the edge:Distortion near the edge:Standard vacuum plateStandard vacuum plate
Vacuum pipe
20
mra
d
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vacuum plate with holesvacuum plate with holes
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Distortion near the edge:Distortion near the edge:vacuum plate with holesvacuum plate with holes
20
mra
d
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Distortion near the edge:Distortion near the edge:glued emulsion on tapeglued emulsion on tape
20
mra
d
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Distortions-central zoneDistortions-central zoneHolesVacuum pipe
20 m
rad
20 m
rad
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Distortions – central zoneDistortions – central zoneGlued
20 m
rad
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ConclusionsConclusions• The vacuum plate for emulsions glued on a larger
adhesive support allows to scan the whole area of the emulsion with good efficiency and good quality.
• The adhesive tape increase the emulsion distortions (not critical).
• The vacuum plate with holes shows good results in the central zone but the scanning near the edge is critical. No improvements with respect to standard vacuum plates.
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G.Sirri – INFN Bologna LNGS 2008-04-03
Vacuum plates
Standard plateplate with holes
Glued emulsion larger vacuum channel= Emulsion
vacuum