1 kazuhiro yamamoto institute for cosmic ray research (icrr) the university of tokyo kagra face to...
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Kazuhiro Yamamoto
Institute for Cosmic Ray Research (ICRR)the University of Tokyo
KAGRA face to face meeting University of Toyama, Toyama, Japan
1 August 2014
Cryogenic sub group
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Contribution
R. TakahashiA, H. Tabaka, T. Miyamoto, K. Ono, T. Sekiguchi, Y. Sakakibara, C. Tokoku, M. Kamiizumi, U. Iwasaki, E. Hirose,
A. Khalaidovski, R. Kumar, T. Uchiyama, S. Miyoki, M. Ohashi, K. Kuroda, T. AkutsuA, H. IshizakiA, F. E. Peña ArellanoA, T. SuzukiB, T. TomaruB, N. KimuraB, S. KoikeB, T. KumeB, ToyodaB, MurakamiB, TerashimaB,
HagiwaraB, K. TsubonoC, Y. AsoC, T. UshibaC, K. ShibataC, D. ChenD, N. OhmaeE, K. SomiyaF, R. DeSalvoG, E. MajoranaH, L. NaticchioniH,
W. JohnsonI, A. CummingJ, R. DouglasJ, K. HaughianJ, I. MartinJ, P. MurrayJ, G. HammondJ, S. RowanJ , G. HofmannK,
C. SchwarzK, D. HeinertK, R. NawrodtK, S. GotoL, M. TanakaL, S. IokaM, K. NakamotoM, H. NezukaM, KAGRA collaboration
ICRR.UT, NAOJA, KEKB, Phys.S.UTC, Astro.S.UTD, E.UTE,S.TITF, Sannio Univ.G, INFNH, Louisiana State Univ.I , University of GlasgowJ,
Friedrich-Schiller-Universitaet JenaK, Jecc TorishaL, Toshiba Keihin Product OperationsM, KAGRA collaboration
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0. Abstract
Although there are many topics, here,I will explain recent progress and status of(1)Cryostat(2)Payload(3)Human resources.
Yusuke explains cryo duct after my talk.
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Contents
1.Introduction2.Cryostat3.Payload4.Human resources5.Summary
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1. Introduction
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3km3km
MozumiY-end Sakonishi
X-end
AtotsuCenter
Vibration isolation system, Cryocooler unit, Cryostat, Cryogenic payload
Schematic view of KAGRA interferometerFour mirrors of arm cavity will be cooled.
Kamioka mine (Underground site)
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Outline of vibration isolation and cryostat
14 m
1. Introduction
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Cryogenic mirror
Cryostat
Vibration Isolation
Outline of vibration isolation and cryostat
14 m
1. Introduction
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to SAS
View ports
Remote valve unit
4 Low vibration cryocooler unit
Main LASER beam
Cryostat Stainless steel t20mm Diameter 2.6m Height ~3.6m M ~ 10 ton
Cryo-coolers Pulse tube, 60Hz 0.9 W at 4K (2nd) 36 W at 50K (1st)
Outline of cryostatCryogenic
payload
Mirror
S. Koike
1. Introduction
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2 Pulse tube cryocoolers
2 Pulse tube cryocoolers
Pulse tube cryocoolers
Baffles Cryo duct(Yusuke’s talk)
Outer shield(80K)
Inner shield(8K)
Vacuum chamber
(300K)
1. Introduction
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Pulse tube cryocoolers
Pulse tube cryocoolers
Pulse tube cryocoolers
Heat link (pure Al)
Sapphire mirror (About 20K)
Heat link (pure Al)
Sapphire fiber
1. Introduction
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One year ago, the cryostats were moved to the warehouse near Kamioka.
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2. Cryostat
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First cryostat will be moved to end of Y arm on the 12th-13th of August ! It will be fixed after 19th of Aug.
2. Cryostat
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Hole on radiation shield for wire from SAS .Duct to reduce radiation invasion is necessary.
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2. Cryostat
Baffles Cryo duct(Yusuke’s talk)
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Design is fixed. It is being manufactured in Mechanical Engineering Center of KEK.
2. Cryostat
Ceiling of radiation shield
Duct for SAS
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Main strategy of cryo payload
One payload in Fiscal year 2014 (by March 2015).
Design drawing
Hagiwara-san (CAD operator in KEK) and Koike-san (Engineer in KEK) proceed (based on Type B payload design).
3. Payload
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Manufacturing factory
We are looking for factories and found three candidates. Mechanical Engineering Center of KEK also can support.
3. Payload
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Sapphire suspension Preparation for (similar size) prototype of lop ear is in progress. We fixed design ear and cut on mirror and ask quotation. Dummy bulk
(Shinkosha)
3. Payload
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Paper about thermal conductivity measurement sapphire fibers with nail heads was accepted !
3. Payload Sapphire suspension
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Sapphire suspension Bonding technique is necessary.
Two kinds of bonding (Both of them are necessary)
Hydroxide Catalysis Bonding Indium
Thermal resistance and mechanical dissipation must be measured.
3. Payload
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Sapphire suspensionThermal resistance of bonding (Dan, GWADW2014)
Preliminary
Probably, it is OK, but Dan proceeds ….
3. Payload
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Sapphire suspensionMechanical loss of indium (Dan in Jena)
3. Payload
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Sapphire suspensionMechanical loss of indium (Dan in Jena)
3. Payload
Investigation is in progress …
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Sapphire suspension
Dan and Rahul proceeds with calculation of thermal noise using Finite Element Method. The result is coming soon.
3. Payload
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CuBe blade spring in platform
Intermediate Mass
Intermediate Recoil Mass
Recoil MassTest Mass (sapphire mirror)
Platform includes CuBe spring for vertical vibration isolation.
3. Payload
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CuBe blade spring in platform
Small CuBe sample to check material properties in KEK(1)Q-value(2)Temperature coefficient of Young’s modulus
Fabrication for measurement was finished.We are preparing samples.
3. Payload
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CuBe blade spring in platformLarge CuBe blade spring (provided by VIS group) in 1/4 cryostat in ICRR. They will be moved to KEK on the 8th of Aug.
3. Payload
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Moving mass to adjust angle of platform and intermediate mass
Cryogenic test in KEK will start soon.
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Intermediate Mass
Test Mass (sapphire mirror)
3. Payload
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Fresh persons
Research staff
Tatsuya Kume : Lecturer (KEK) Vibration measurement, Cryo duct
New a few project assistant professors (ICRR) for cryogenic payload, cryogenic mirror and so on They will start to work on the beginning of 2015 in the earliest case.
4. Human resources
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Fresh persons
Graduate students (Master course)
T. Miyamoto, H. Tanaka
Technical staff
Toyoda : Support for cryogenic experiment and Design drawing Terashima : Technician (Machining) Murakami : Technician (Welding) Hagiwara : CAD operator
4. Human resources
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ELiTES: ET-LCGT interferometric Telescope Exchange of Scientists Grant for collaboration about cryogenic between KAGRA and ET European 7th Framework Programme Marie Curie action (Mar. 2012 - Feb. 2016)
European people can visit Japan for KAGRA. In the first half year of 2014, 22 guests came !
4. Human resources
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5. SummaryCryostat First and second cryostats will be installed at Y end of KAGRA site on August , respectively.
Cryo duct Yusuke reports soon !
Payload One payload by March 2015 Design and search for factories are in progress. Prototype of sapphire suspension is being prepared.
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5. SummaryPayload Dan Proceeds with experiment for sapphire boding techniques. KEK proceeds with various tests (CuBe spring, moving mass ....)Fresh persons 1 lecturer, 2 graduate student (master course), 3 technical staffs New project assitant professors come at the January 2015.
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Thank you for your attention !
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Sapphire suspensionQ of square nail head
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One fiber prototype
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Some items for future research (not perfect list)
(a)Investigation material properties (Q, thermal conductivity, strength etc.) of coating, fiber and so on.(b)Sapphire bonding, Sapphire fiber clamp(c)Control and damping scheme Actuators and sensors at cryogenic temperature(d) Mechanical and thermal simulation for payload(e) Vertical spring in cryostat(f) Reduction of initial cooling time Thermal resistance of clamp .... (g) Baffles for scattered light in radiation shield(h) Assembly procedure
7. For future
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8. SummaryCryostat : Assembly is in progress. Cooling test is coming soon.Cryogenic duct : Optimum position of 5 buffles Future work : scattered lightCryocooler unit : Cooling test and vibration measurement : OKCryogenic payload Preparation for 1/4 cryostat to check payload performance is in progress. Current main R&D topics Inital cooling time, Sapphire fiber with nail head, Coating mechanical loss, Vibration of shield
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2. Issues
(1)How to assemble Details of construction, clean room ….
(2)Strength Tensile strength, development of clamp, sapphire bonding …
(3)Control and damping system to reduce fluctuation and instability Actuators (what and where), resonant mode (frequency and Q) and so on
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2. Issues
(4)Cooling
Temperature of mirror (below 20 K), initial cooling time, heat resistance of clamp …
(5)Noise
Thermal noise, vibration via vibration isolation system and heat links …
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After Yusuke left …. Clamp for IMPEX fibers in Jena
4. Sapphire fibers
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Profile measurement in Glasgow
4. Sapphire fibers
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Q measurement in Jena
5. Sapphire suspensionSapphire fibers with nail heads
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Outline of vibration isolation and cryostat
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2 Pulse tube cryocoolers
2 Pulse tube cryocoolers
Pulse tube cryocoolers
Baffles Cryoduct
Outer shield(80K)
Inner shield(8K)
Vacuum chamber
(300K)
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Sapphire suspensionMechanical loss of indium (Dan in Jena)
Preliminary
Lo
ss a
ng
le
3. Payload
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Sapphire suspension
Dan’s calculation
Dan and Rahul proceeds with calculation of thermal noise using Finite Element Method. The result is coming soon.
Preliminary
3. Payload