lcgt vacuum system 120123 vac (ys) 1 1. overview items ** two beam tubes of 3-km long and 800 mm in...
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LCGT Vacuum System 120123 VAC (YS)
1
1. Overview
Items** two beam tubes of 3-km long and 800 mm in diameter** optical baffles distributed at every 12 meter in the beam tubes** beam monitor target inserted in the beam tubes** chambers for the mirrors with suspension and vibration-isolation devices ** vacuum pumping system** overall layout
Interfaceall of the subsystems
** choice of materials for components used in cryostat, optical devices, vibration-isolation devices, , …** interferometer layout and operation sequence
cf. vacuum system philosophy in accelerator** beam dynamics and vacuum system have to be designed simultaneously.** choice of materials having low outgassing is most important.** mechanical and electric design has to be simple.** materials properties have to be examined and measured before choosing.
(KEK Internal 07-17)
** We predict the noise dx due to the residual gas (water) molecules;for dx = 1×10-21 m/√Hz@100 Hz (safety margin of 10),the pressure in the beam tubes is to be kept at 2×10-7 Pa.
(h=3×10-24 /(Hz)1/2 @100Hz corresponds to dx=1×10-20 m/(Hz)1/2)
<<scattering effect due to residual gas>>
120123 VAC (YS)
** For long-term and stable operation of the interferometer, the vacuum system is to be designed so as to minimize the maintenance work, and so as to shorten the pump-down time. A long lifetime of the vacuum component and low outgassing is required.
<<minimize the maintenance work>>
Ti cathode
Penning cell
Required Pressure : in the order of 10-7 Pa, or lower
2
LCGT Vacuum System
2. System design
LCGT Vacuum System 120123 VAC (YS)
ETMYA
ITMY
ETMXAITMX
IP TMP
FL P
BSPRM PR3 PR2
SRM
SR3
SR2
PD
MCF
MC
3000 m
double chambers (2.4 and 1.5 m in dia.)//GASF + I-Pendulum + cryogenic//
chambers (1.5 m in dia./2 m for BS)//GASF + I-Pendulum//
chambers (2 m in dia.)//stack + D-Pendulum//
iLCGT iLCGT
MMT
ETMYB
ETMXB
less changes “i” to “b”
3
2. System design
120123 VAC (YS)
Electro-polished tube of 12 m long 4
LCGT Vacuum System
beam tube (478 of 12-m long and 0.8 m in diameter)
2. System design
** “surface passivation” is performed by electro-polish followed by bake.expected outgassing rate is on the order of 10-8 Pa m3 m-2 s-1, or lower.the surface roughness is Rmax 3 mm, Ra 0.5 mm.
** “flange connection” with metal O-ring gasket (silver plated) is chosen.humidity test of the gasket shows erosion proof.
** tubes of “mirror finish by Electro-Chemical Buffing” is to be installed in the mid region of 800-m long. the surface roughness is Rmax 0.2 mm, Ra 0.03 mm.
N=(h/d)/(L/R)
** estimated scattered light noise at Kamiokadx = 3×10-21 m/√Hz@30Hz (tube vibration amplitude=1×10-11 m/√Hz assumed )
** For more margin, baffles at “every 12 meters”. dx = 5×10-22 m/√Hz** For randomizing phase of edge-scattered light, baffles with “saw-tooth edge”.
120123 VAC (YS)
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LCGT Vacuum System
optical baffle (every12-m along the arm, 40-mm in height, 45-degree tilted)
2. System design
** measured outgassing rate of DLC is 4×10-9 Pa m3 m-2 s-1
120123 VAC (YS)
真空
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LCGT Vacuum System
optical baffle (diamond-like-carbon/DLC coated)
2. System design
** 17 of 21 chambers are operated at room temperature, 4 for cryogenic system** installed materials of elastomer and plastomer should be investigated.
** Although the aluminum-coated thin PET (polyethylene terephtalate) film is suitable material for thermal shield, the outgassing rate is higher than those of metal surfaces.
** Outgassing rate of a PET film of 12 micrometer thick is measured. The rate decreases to 10-6 Pa m3 s-1 m-2 for about 10h, then reaching to the order of 10-8 Pa m3 s-1 m-2 for 200h.
** Water molecules absorbed in film is possibly diffused to the surfaceand desorbed with a long period of 100 hours.
120123 VAC (YS)
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LCGT Vacuum System
chambers
2. System design
** pumping unit consisted of dry-pump, TMP and ion-pump is distributed “every 100 meters” along tubes.
ETMXITMX
IP TMP
FL P
3000 m
** expected pump-down scheme (a 3-km arm)to 1 Pa >> few days by dry-pumpto 10-6 Pa >> 50 hours by TMPto 10-7 Pa >> 500 hours by IP
(based on the ougassing rate in test tubes)
** pumping speed of the unit (100 m)600 m3/h >> dry-pump2000 L/s >> TMP500 L/min >> TMP foreline pump1000 L/s >> IP
120123 VAC (YS)
DRY P
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LCGT Vacuum System
pumping system (dry-pump and ion-pump)
2. System design
control signal 0/1
pressure readout
120123 VAC (YS)
9
LCGT Vacuum System
vacuum system control
2. System design
arm tunnel, center/end room
BA gaugeULVAC GI-M2
controller
PLCYokogawa
A/DYokogawa
MW100
Micro IOC
Center controlEPICS
Pirani gaugeConvectron type
Gate valve( actuator )
Ion pumpVARIAN type
Ion pumpGamma type
Ethernet
RS485
→ status: 3 ← control: 3
→ status: 4
← control: 2
→ status: 2← control: 1
controller
controller
controller
controller
A gate valves of large diameter takes 40 seconds for closing.
120123 VAC (YS)
ETMYA
ITMY
ETMXAITMX
BSPRM PR3 PR2
SRM
SR3
SR2
PD
MCF
MC
3000 m
iLCGT iLCGT
MMT
ETMYB
ETMXB
bLCGT HR Center HR Chord Center Center of Mass
x [m] y [m] x [m] y [m] x [m] y [m]PRM -19.46123288 0.21377918 -19.46120738 0.21377925 -19.51120721 0.21364765ETMX 3.026507E+03 -0.093909 3.026507E+03 -0.093909 3.026582E+03 -0.093909 ETMY 0.060725 3.023222E+03 0.060725 3.023222E+03 0.060725 3.023297E+03PR2 -4.7006812 0.25262878 -4.69784943 0.25267014 -4.64785476 0.253400400SRM 0.13541083 -19.41723194 0.13541104 -19.41720645 0.13501125 -19.46720485SR2 0.25343357 -4.65710099 0.25349012 -4.65426948 0.25448854 -4.60427945SR3 -0.10002163 -15.71840442 -0.10001528 -15.71808665 -0.1010137 -15.76807668PR3 -15.7637214 -0.04148993 -15.76340359 -0.04148529 -15.81339825 -0.04221555BS -7.63E-16 -6.94E-18 -7.63E-16 -6.94E-18 0.02828427 -0.02828427ITMX 26.50720079 -0.09390876 26.50720439 -0.09390876 26.43220439 -0.09390876ITMY 0.06072497 23.22189738 0.06072497 23.22190098 0.06072497 23.14690098
iLCGT HR Center HR Chord Center Center of Mass
x [m] y [m] x [m] y [m] x [m] y [m]PRM -19.51677794 0.21417189 -19.51675245 0.21417196 -19.56675227 0.21404036ETMX(iEOAX) 3.001576E+03 -0.093237 3.001576E+03 -0.093237 3.001626E+03 -0.093237 ETMY(iEOAY) 0.061257 2.998291E+03 0.061257 2.998291E+03 0.061257 2.998341E+03PR2 -4.7281891 0.25309529 -4.72535740 0.25313951 -4.67536350 0.253920280SRM 0.13550922 -19.47206837 0.13550943 -19.47204288 0.13510964 -19.52204128SR2 0.25374881 -4.68452802 0.25380268 -4.68169646 0.25475388 -4.63170551SR3 -0.07797132 -15.7185301 -0.07796549 -15.71821231 -0.07888163 -15.76820392PR3 -15.76285711 -0.06258281 -15.76253931 -0.06257763 -15.81253268 -0.06339185BS -4.09E-16 3.47E-18 -4.09E-16 3.47E-18 0.02832301 -0.02824548ITMX(iIAOX) 53.21470655 -0.09323681 53.21471015 -0.09323681 53.16471015 -0.09323681ITMY(iIAOY) 0.06125676 49.92936491 0.06125676 49.92936851 0.06125676 49.87936851
less changes “i” to “b”
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LCGT Vacuum System
layout
2. System design
120123 VAC (YS)
ETMYA
ITMY
ETMXAITMX
BSPRM PR3 PR2
SRM
SR3
SR2
PD
MCF
MC
3000 m
iLCGT iLCGT
MMT
ETMYB
ETMXB
i-b HR Center HR Chord Center Center of Mass
delta x [mm] delta y [mm] delta x [mm] delta y [mm] delta x [mm] delta y [mm]PRM -55.545 0.393 -55.545 0.393 -55.545 0.393ETMX -24931.300 0.672 -24931.300 0.672 -24956.300 0.672ETMY 0.532 -24931.340 0.532 -24931.340 0.532 -24956.340PR2 -27.508 0.467 -27.508 0.469 -27.509 0.520SRM 0.098 -54.836 0.098 -54.836 0.098 -54.836SR2 0.315 -27.427 0.313 -27.427 0.265 -27.426SR3 22.050 -0.126 22.050 -0.126 22.132 -0.127PR3 0.864 -21.093 0.864 -21.092 0.866 -21.176BS 0.000 0.000 0.000 0.000 0.039 0.039ITMX 26707.506 0.672 26707.506 0.672 26732.506 0.672ITMY 0.532 26707.468 0.532 26707.468 0.532 26732.468
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less changes “i” to “b”
LCGT Vacuum System
layout
2. System design
x
y
Yopthorizontal plane at center room
horizontal plane at X end
Y arm
optical plane of interferometerX arm
BS
ETMX
ETMY
X arm
Y arm
ITMXITMY
Xopt
Yopt
O
Xopt
O (BS)
iLCGT
1/300
120123 VAC (YS)
horizontal plane at Y end
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LCGT Vacuum System
layout
2. System design
** floors for installing chambers; horizontal
x
y
Yopthorizontal plane at center room
horizontal plane at X end
Y arm
optical plane of interferometerX arm
Xopt
O (BS)
120123 VAC (YS)
eX
eY
eZ
0.9999944444 0.0000000000 0.0033333148
0.0000111110 0.9999944444 0.0033333148
0.0033332962 0.0033333333 0.9999888889
ex
ey
ez
0.9999927478 0.0000000000 0.0038084338
0.0000126947 0.9999944444 0.0033333091
0.0038084127 0.0033333333 0.9999871923
eRXx
eRXy
eRXz
0.9999944444 0.00000952935 0.0033333011
0.0000000000 0.99999591356 0.0028588213
0.0033333148 0.00285880545 0.9999903580
eRYx
eRYy
eRYz
horizontal plane at Y end
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LCGT Vacuum System
layout
2. System design
** unit vectorsin each coordinate
eX
eY
eZ
** transformation matrix for 4 sets of coordinates
** transformation matrix for 4 sets of coordinates
x
y
Yopthorizontal plane at center room
horizontal plane at X end
Y arm
optical plane of interferometerX arm
Xopt
O (BS)
120123 VAC (YS)
X
Y
Z
0.9999944444 0.0000000000 0.0033333148
0.0000111110 0.9999944444 0.0033333148
0.0033332962 0.0033333333 0.9999888889
x
y
z
0.9999927478 0.0000000000 0.0038084338
0.0000126947 0.9999944444 0.0033333091
0.0038084127 0.0033333333 0.9999871923
xRX
yRX
zRX
OXopt
0.9999944444 0.00000952935 0.0033333011
0.0000000000 0.99999591356 0.0028588213
0.0033333148 0.00285880545 0.9999903580
xRY
yRY
zRY
OYopt
horizontal plane at Y end
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LCGT Vacuum System
layout
2. System design
** descriptionin other coordinate
x
y
Yopthorizontal plane at center room
horizontal plane at X end
Y arm
optical plane of interferometerX arm
BS
ETMX
ETMY
X arm
Y arm
ITMXITMY
Xopt
Yopt
O
Xopt
O (BS)
iLCGT
1/300
120123 VAC (YS)
horizontal plane at Y end
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LCGT Vacuum System
layout
2. System design
500 m
** a set of two 1.5-km long interferometer for geophysics
120123 VAC (UI)
16
LCGT Vacuum System
four coordinates
120123 VAC (UI)
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LCGT Vacuum System
Center room coordinate
Optical coordinate
axis
axis
axis = axis
axis
+𝜽
−𝝀
120123 VAC (UI)
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LCGT Vacuum System
** Transformation of coordinate from Optical coordinate to Center room coordinate
bLCGT m単位: f(x,y,z) x y zETMX HR Center 3026.49038516780000000 - 0.09390823838321690 10.08861431483210000ETMX HR Chord Center 3026.49038516780000000 - 0.09390823838321690 10.08861431483210000ETMX HR Center of Mass 3026.56538475114000000 - 0.09390823838321690 10.08886431344320000
ETMY HR Center 0.10084051722090500 3023.20510427612000000 - 10.07712618371120000ETMY HR Chord Center 0.09431580265810740 3023.20509427618000000 - 10.07714789942620000ETMY HR Center of Mass 0.09431663598681110 3023.28009385951000000 - 10.07739789803730000
BS HR Center 0.00000000000000000 0.00000000000000000 0.00000000000000000BS HR Chord Center 0.00000000000000000 0.00000000000000000 0.00000000000000000BS Center of Mass 0.02828442713439690 0.02828411286473020 0.00000000000000000
ITMX HR Center 26.50705248557570000 - 0.09390823828321740 0.08866987255763190ITMX HR Chord Center 26.50705608555570000 - 0.09390823828321740 0.08866988455756530ITMX HR Center of Mass 26.43205650221890000 - 0.09390823828321740 0.08841988594644260
ITMY HR Center 0.06098265229042840 23.22176836910060000 - 0.07720347912630740ITMY HR Chord Center 0.06098265233042810 23.22177196908060000 - 0.07720349112624070ITMY HR Center of Mass 0.06098181900172440 23.14677238574850000 - 0.07695349251511800
PRM HR Center - 19.46112238762260000 0.21377861233114500 - 0.06558301125094960PRM HR Chord Center - 19.46109688777040000 0.21377806233420100 - 0.06558292441809870PRM HR Center of Mass - 19.51109644145810000 0.21364646306531400 - 0.06574915092795390
PR2 HR Center - 4.70065227835122000 0.25262737650287900 - 0.01651094153946850PR2 HR Chord Center - 4.69782052362359000 0.25266873627310100 - 0.01650164022447560PR2 HR Center of Mass - 4.64782612325549000 0.25339899221608900 - 0.01633742643677190
PR3 HR Center - 15.76363428549650000 - 0.04148969949974860 - 0.05240714708332500PR3 HR Chord Center - 15.76331647721050000 - 0.04148505952552650 - 0.05240610318912440PR3 HR Center of Mass - 15.81331086757870000 - 0.04221531546851520 - 0.05257031694349490
SRM HR Center 0.13519433190090900 - 19.41712406618960000 0.06517511381704010SRM HR Chord Center 0.13519454218296300 - 19.41709857633120000 0.06517502955084160SRM HR Center of Mass 0.13479419886930900 - 19.46709669856150000 0.06534035733235650
SR2 HR Center 0.25338041676837300 - 4.65707511714485000 0.01636835759826590SR2 HR Chord Center 0.25343699791525600 - 4.65424362287551000 0.01635910778298700SR2 HR Center of Mass 0.25443596781021600 - 4.60425387059867000 0.01619580332356480
SR3 HR Center - 0.10019572229664500 - 15.71831709528840000 0.05206098673976600SR3 HR Chord Center - 0.10018936880116400 - 15.71799932705380000 0.05205994867886630SR3 HR Center of Mass - 0.10118833869612400 - 15.76798907933070000 0.05222325313828850
F(X,Y,Z) X Y Z3026.50720000000000000 - 0.09390876010000000 0.000000000000000003026.50720000000000000 - 0.09390876010000000 0.000000000000000003026.58220000000000000 - 0.09390876010000000 0.00000000000000000
0.06724972300000000 3023.22190000000000000 0.000000000000000000.06072497230000000 3023.22189000000000000 0.000000000000000000.06072497230000000 3023.29689000000000000 0.00000000000000000
0.00000000000000000 0.00000000000000000 0.000000000000000000.00000000000000000 0.00000000000000000 0.000000000000000000.02828427000000000 0.02828427000000000 0.00000000000000000
26.50720079000000000 - 0.09390876000000000 0.0000000000000000026.50720439000000000 - 0.09390876000000000 0.0000000000000000026.43220439000000000 - 0.09390876000000000 0.00000000000000000
0.06072497000000000 23.22189738000000000 0.000000000000000000.06072497000000000 23.22190098000000000 0.000000000000000000.06072497000000000 23.14690098000000000 0.00000000000000000
- 19.46123288000000000 0.21377980000000000 0.00000000000000000- 19.46120738000000000 0.21377925000000000 0.00000000000000000- 19.51120721000000000 0.21364765000000000 0.00000000000000000
- 4.70068120000000000 0.25262878000000000 0.00000000000000000- 4.69784943000000000 0.25267014000000000 0.00000000000000000- 4.64785476000000000 0.25340040000000000 0.00000000000000000
- 15.76372140000000000 - 0.04148993000000000 0.00000000000000000- 15.76340359000000000 - 0.04148529000000000 0.00000000000000000- 15.81339825000000000 - 0.04221555000000000 0.00000000000000000
0.13541083000000000 - 19.41723194000000000 0.000000000000000000.13541104000000000 - 19.41720645000000000 0.000000000000000000.13501125000000000 - 19.46720485000000000 0.00000000000000000
0.25343357000000000 - 4.65710099000000000 0.000000000000000000.25349012000000000 - 4.65426948000000000 0.000000000000000000.25448854000000000 - 4.60427945000000000 0.00000000000000000
- 0.10002163000000000 - 15.71840442000000000 0.00000000000000000- 0.10001528000000000 - 15.71808665000000000 0.00000000000000000- 0.10101370000000000 - 15.76807668000000000 0.00000000000000000
↑麻生先生データ
Center room coordinate Optical coordinate (by (Asou)
120123 VAC (UI)
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LCGT Vacuum System
120123 VAC (UI)
20
LCGT Vacuum System
** Drawing of 3D-CAD pictures
Apr 2014
Apr 2014Apr 2014 to Aug 2014
Sep 2014
Oct 2014 to Mar 2015
1) manufacturing 478 of tubes; from Apr 2011 to Mar 20132) manufacturing chambers; from Sep 2012 to Mar 20143) installing chambers in X end; Apr 2014 4) installing tubes in X arm; from Apr 2014 to Aug 20145) installing chambers in Center Room; Sep 20143) installing tubes in Y arm; from Oct 2014 to Mar 20155) installing chambers in Y end; Mar 2015X arm pump down; Sep 2014 Y arm pump down; Mar 2015
21
120123 VAC (YS)LCGT Vacuum System
expected schedule for installing (1)
3. Schedule
ETMYA
ITMY
ETMXAITMX
BSPRM PR3 PR2
SRM
SR3
SR2
PD
MCF
MC
3000 m
iLCGT iLCGT
MMT
ETMYB
ETMXB
carrying tubes from MOZUMI pithead
22
120123 VAC (YS)LCGT Vacuum System
expected schedule for installing (2)
3. Schedule 1) manufacturing 478 of tubes; from Apr 2011 to Mar 20132) manufacturing chambers; from Sep 2012 to Mar 20143) installing chambers in X and Y ends; Apr 2014 4) carrying tubes and lay on the supports;
from Apr 2014 to Jun 20145) jointing tubes and pump down in X and Y arm
from Jul 2014 to Mar 20156) installing chambers in Center Room; Jul 2014
Apr 2014
Apr 2014Jul 2014 to Mar 2015
Jul 2014
carrying tubes from ATOTSU pithead
ETMYA
ITMY
ETMXAITMX
BSPRM PR3 PR2
SRM
SR3
SR2
PD
MCF
MC
3000 m
iLCGT iLCGT
MMT
ETMYB
ETMXB
Jul 2014 to Mar 2015
Apr 2014
** recovery “without breaking arm-vacuum”BA gauge failure: grid contamination, filament breakdownfeedthrough erosion; high voltage feedthrough of ion pumppower supply/controller erosion; ion pump, turbo molecular pumpdurability for humidity is being examined (50°C-98%, 7 cycle of 8h-operation/98h-off).
** recovery “by re-pumping an arm”window (view port) break downcrack and erosion in bellow jointmetal gasket erosion
** safety “by closing gate valves (large dia,)”electric-power shut downanomalous pressure rise ETMXITMX 3000 m
expected pump-down scheme (a 3-km arm)to 1 Pa >> few days by dry-pumpto 10-6 Pa >> 50 hours by TMPto 10-7 Pa >> 500 hours by IP
(based on the ougassing rate in test tubes)
120123 VAC (YS)
IP TMP
FL PDRY P
23
LCGT Vacuum System
vacuum component failure and leakage
4. Risk management
** “surface passivation process” of stainless steel prior to installation is planned by applying electro- polishing, and then followed by pre-baking treatment.
** “outgassing rate” of the order of 10-8 Pa m3 m-2 s-1, or lower is performed in J-PARC.
Appendix: outgassing data measured for technical surface
0.1 1 10 1001E-09
1E-08
1E-07
1E-06
1E-05
1E-04 Ti (passivated): ID 164 X L 4782SUS316 (ECB): ID 600 X L 9990SUS316 (EP/pre-baked): ID 131-104 X L 6399Cu (PR-EF lining, 2nd pump.): ID 560 X L 3000alumina ceramic: ID 246-188 X L 3540
pumping time [hours]
outgassin
g rate [P
a m3 s-1 m-2]
120123 VAC (YS)
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LCGT Vacuum System