koto csiカロリメータを...
TRANSCRIPT
![Page 1: KOTO CsIカロリメータを 地震から保護するosksn2.hep.sci.osaka-u.ac.jp/~taku/koto/slides/csi_cover_jps_2011... · x3 safety factor = 66kPa (20t on 2m-diameter surface)](https://reader036.vdocuments.site/reader036/viewer/2022062601/5b9ef78e09d3f2fc778cbb79/html5/thumbnails/1.jpg)
KOTO CsIカロリメータを地震から保護するカバーの設計と製作
Taku YamanakaSeptember 19, 2011
JPS Fall Meeting@Hirosaki
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KOTO CsI Calorimeter
2240 2.5cm x 2.5cm
476 5cm x 5cm
50cm long CsI crystals
Finished stacking on Feb. 10, 2011
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J-PARC KOTOAt the earthquake on March 11, the CsI crystals moved out by ~5mm
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Purpose of this project
Prevent the crystals from flying out of the cylinder at the NEXT large earthquake
Assumptions
1G horizontal acceleration
4.5g/cm3 x 50cm x 9.8m/s2 = 22kPa side pressure
x3 safety factor = 66kPa
(20t on 2m-diameter surface)
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Design Requirements
Strong
Light (no crane inside the dry room)
Soft (not to damage crystals)
Limited out-gassing in vacuum
V1 = to be used until the beam time
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Hard plate?SS400 steel: strength = σmax = 2400kg/cm2
Required thickness = 2cm
weight = 490kg!
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P = 66kPa
h
a
σmax =3(3 + ν)
8Pa2
h2
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co /en
cushncfoss sa?rirn
IOuTen ylen/
,-. . .
Cover made of a strong cloth
Structure to keep parabola
shape
Soft cover
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Tension and curvature - in case of a string -
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T
T
θ2
θ1
x
z w [N/m]
Δx
w∆x = T (sin θ2 − sin θ1)
� T (dz
dx(x + ∆x)− dz
dx(x))
w � Td2z
dx2
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Tension and curvature- in case of a sheet -
If the sheet has a parabola shape:
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Cushrutr
cforSSec,t'rtrn
outen ylerV
I
HI +:iJ;r'\,
Hh
Pz = ar2 = a(x2 + y2)P = 4aT
P∆x∆y = T∆y
�dz
dx(x + ∆x)− dz
dx(x)
�+T∆x
�dz
dy(y + ∆y)− dz
dy(y)
�
P � T (∂2z
∂x2+
∂2z
∂y2)
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Material for the cover
T = 170kN/m
a = P/4T = 66kPa/ (4x170kN/m) = 0.1/m
bulges out 10cm + offset at the center
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weight(g/m2)
strength(N/m)
Kevlar Cloth T713 278 1.7x105
Kevlar Cloth T710 315 2.0x105
Teijin Technora MF1500 220 1.7x105
Teijin Technora MF1531 461 3.4x105
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How to sew fabrics together
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and who would be even willing to do it?
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Company for fabricating the cover
NI帝人商事 introduced 明大(株)
at Kurashiki, Okayama
http://www.meidai.co.jp/
Makes strong sling belts with Teijin Technora (~100t)
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Strength test
Make a fabric loop with sewing
Insert two bars inside the loop
Press the two bars apart with force F
Tension = F/2
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F
5cm
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Sample made by companyTension
~3kN/5cm
= 60kN/m
< 170kN/m (fabric strength)
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The weft slip.Warp only
The weft are squeezed
Sewing thread push the weft
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I tried many sewing methods18
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SolutionMake dead ends for weft
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10mm
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SolutionMake dead ends for weft
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10mm
Tension ~ 100 kN/m
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Final sewing method for Ver.1Bend two fabrics together in Z-shape
Sew 3 locations x 3 times w/ 3mm pitch
Tension = 100 kN/m = 0.6 x 170kN (fabric)
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DesignSew three 1m wide fabrics => 1 sheet
2 sheets at 45deg
Add sides for securing down to the cylinder
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The cover24
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Securing the cover
Make a loop at the end, and insert a rope
The rope is hold by 9t x 44mm steel bars bolted down to the cylinder
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idea by Ogahara@Meidai
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co /en
cushncfoss sa?rirn
IOuTen ylen/
,-. . .
How to keep the parabola shape
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co /en
cushncfoss sa?rirn
IOuTen ylen/
,-. . .
.(,
*0,
(!, '-brn, l^fls,) N (I,=ll7r !z'lzon")
xz +6##h" 4 d$t>ftR : !fute e"=)Ltt"(r
(eil(: ral-t 1t"tl7' VU'?SJ
7Ar/^,r
PVC pipes
2mm thick Polyethylene plates
Solution = Polyvinyl Chloride pipes
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40 different types
379 pieces
28Mr. UesawaVice President
Kyoto Jushi-Seiko
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5cm short!
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So we removed strings for half a circle, extended the side sheet by 7cm, and hand-sewed it.
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Aug. 19, 2011 3AM= T - 6h
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What we learned
Do not expect 1mm accuracy for fabrics
By sewing, fabrics takes min(L1, L2)
Prepare an length-adjustment mechanism for fabrics
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SummaryMade a cover to hold the CsI crystals under 1G horizontal acceleration.
Aramid cloths (Technora, Kevlar) are useful materials for such solutions.
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明大(株) (縫製)NI帝人商事(株) (縫製社紹介)京都樹脂精工(株) (塩ビパイプ切り)宮崎 (金属加工)秘書の亀井さん (ミシン貸し出し)浅川直也君(4年生) (outgas試験)
Acknowledgements