Atsuhiko Ochi Kobe University Yousuke Kataoka ICEPP ATLAS MicroMEGAS meeting 190113 We need resistive strips Screen printing is one of hopeful method However there are some difficulty remained ID: 505279
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Slide1
Researches for production methods of resistive strips
Atsuhiko Ochi (Kobe University)Yousuke Kataoka (ICEPP)
ATLAS
MicroMEGAS
meeting,
19/01/13Slide2
We need resistive strips Screen printing is one of hopeful method.
However, there are some difficulty remained ...Fine pitch of the strips400mm spacing is ok (like zebra chamber and Japanese chamber), but more fine pitch is required ?Uniformity for large size (1m X 1m)Technician in company said that it
will be difficult to make large size.
2013/1/29
A.Ochi Kobe Univ.
2
Production methods
for resistive stripsSlide3
We have Two approaches now!(Using budget from Kobe and ICEPP)
Drawing the strips using dispenser by resistive polyimideForming the strips by spattered thin metal
2013/1/29
A.Ochi Kobe Univ.
3
Other methods are investigating !!Slide4
We have a small dispenser system in KEK, and we will try to use this for next prototype.
There are some parameters to be modified …Drawing pressureDrawing speedDiameter of the nozzleDistance from board to nozzleThose parameters should be modified by viscosity of the material
1
st
approache
:Strips by Dispenser
2013/1/29
A.Ochi Kobe Univ.
4Slide5
Conditions:
Sample material: Carbon doped polyimide (Toray)Substrate: Kapton sheetTemperature: 25Diameter of dispenser: 100mm
Line pitch: 400
m
mGood samples
2013/1/29
A.Ochi Kobe Univ.
5
Drawing test
Pressure: 100kPa,
Line drawing:
10mm/sec
Pressure: 50kPa,
Line drawing:
15mm/sec
~ 250
m
m
~ 120
m
mSlide6
However, the solution of condition with good line drawing is very narrow
Very fine tuning of the gap between nozzle and board is requiredFinesse of a few tenth micro meter is requiredWe need more study for fine drawing (in these couple of month)2013/1/29
A.Ochi Kobe Univ.
6
Drawing test
Bad sample:
With a little bit large gap
Bad sample:
Too far or too fast drawingSlide7
Spattering metal on a substrate provides high resistivity (~1M
W/sq.)Industrially, spattering process is available using large chamber.f1800 mm x H2000 mmMaximum board size: 1m x 4.5m (flexible board)We will make large resistive strips, then we will test it as a candidate of production process.
2013/1/29
A.Ochi
Kobe Univ.
7
2
nd
approach:
Thin metal spatteringSlide8
Very fine structure (a few tens micro meter) can be formed using photo resist. (same as PCB)
We will make a first test in this February2013/1/29
A.Ochi Kobe Univ.
8
Production processSlide9
Screen printing
Drawing by DispenserSpattering
Size
OK
(>1m x 2m)
Probably ok(need special machine)OK (>1m
x 2m)Fineness (Strip pitch)
~ 400 um
~ 200 um ?
< 100 um
Production
hour/m^2
~ 1h
~
100h/nozzles
A few h
Cost/chamber
Very low
(If
special printing machine is need, we have to include it.)
Very low
(but
initial machine for large size will be several hundreds
kCHF
)
~ 1kCHF
(no special facility needed)
Research
Small prototypes are tested
Just start to make stripsJust ordered to industrial company. (to make a sample)
2013/1/29A.Ochi Kobe Univ.
9
Comparison of each method
This table is only my rough estimationSlide10
Date
PlansFeb. 2013
Sample strip board (without micro mesh) will be made
and tested. We will decide which technology will be apply for next small MM prototype.
Mar.
2013
Producing MM prototype with new technologyApr.~
Try
to make a large size sample
2013/1/29
A.Ochi Kobe Univ.
10
Plans