As Assembly of of Pr Prot otot otyp ype Sapphi Sa hire e Su - - PowerPoint PPT Presentation

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As Assembly of of Pr Prot otot otyp ype Sapphi Sa hire e Su - - PowerPoint PPT Presentation

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As Assembly of of Pr Prot otot otyp ype Sapphi Sa hire e Su Suspens ension on Bin-Hua Hsieh 1 R Kumar 2 , T Suzuki 2 , T Yamada 1 , K Craig 1 , H Vocca 4 , K Yamamoto 3 , T Kajita 1 , T Tomaru 2 ICRR, The University of Tokyo 1 High

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May 21st, 2017 1

As Assembly of

  • f Pr

Prot

  • tot
  • typ

ype Sa Sapphi hire e Su Suspens ension

  • n

R Kumar2, T Suzuki2, T Yamada1, K Craig1, H Vocca4, K Yamamoto3, T Kajita1, T Tomaru2

Bin-Hua Hsieh1

ICRR, The University of Tokyo1 High Energy Accelerator Research Organization (KEK)2 The University of Toyama3 The University of Perugia, Italy4

The 3rd KAGRA International Workshop @Academia Sinica, Taipei

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Ou Outlin tline

lDesign of Sapphire Suspension System lAssembly of Sapphire Suspension lSapphire Fiber Strength Test lFuture Work lSummary

2 The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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3

Cr Cryogenic Pa Payload System

Operational temperature - 20 K

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

Sapphire Suspension

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Wh Why y do

  • we

e use e Sap apphire? e?

l To reduce the thermal noise fluctuations and increase the sensitivity of the detector lThermal noise power spectrum

4

  • T. Uchiyama et al., Physics Letters A 261(1999)5

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

𝑦" ∝ 𝑈×𝜚 = 𝑈 𝑅

2×10,

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5

Th Thermal al Noi

  • ise

se

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

  • K. Yamamoto et al.,

PHYSICAL REVIEW D 74, 022002 (2006)

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Sap Sapphir ire Su Suspension ion

Credit: R Kumar, ANSYS model Each fiber should support a load of 5.75 kg

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017 Indium Indium

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As Assembly ly of f Prototyp ype Sa Sapphir ire Sus Suspens pensio ion

  • 1. Assembled of all metal prototype(22 kg dummy mirror, CuBe blade springs

and metal fibers)

  • 2. Replaced metal dummy mirror with sapphire mirror
  • 3. Replaced CuBe blade spring with sapphire blade spring
  • 4. Replaced metal fibers with sapphire fibers and suspend the sapphire mirror
  • 1. Check the strength of the suspended system
  • 2. Measure the resonant frequency of sapphire suspension system
  • 3. Perform a cool down test in cryostat at KEK

Ch Characterization

  • n (S

(Sapphire S Suspension

  • n)

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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All metal prototype Replace with sapphire mirror Earthquake stopper Fiber holder 22kg dummy mirror

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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3 axis linear stages

Sapphire fiber holders

Nail head clamps Brackets for attachment at support structure

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017 8

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9

Sapphire blade springs Sapphire fiber

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

Intermediate mass Micrometer screw Copper clamp

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Fi Fiber ber S Streng ength T h Tes est

Load 12 kg Load 6 kg

  • Proof check – Sapphire fibers

should survive 6 kg & 12 kg load test for 1 hour each (safety factor 2)

  • We strength tested 22

sapphire fibers from IMPEX

  • 12 sapphire were found to

be strong

  • 10 fibers were found to be

weak at weld points

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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12

Wh Why y Sapphire Fiber broke?

2014 fibers construction schematic 2015-16 fibers construction schematic

Only 1 of the 6 fibers in 2014 batch survived 6kg load (i.e. 5 were broken) Finally 12 sapphire fibers out of 16 survived 12 kg load test (1 hour of hanging)

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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Su Succe ccessfu ful test hang g of f Sa Sapphire Su Suspension

On May 13th 2017, we suspended 22kg sapphire test mass on 4 sapphire fibers and 4 sapphire blade springs

13 The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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Fu Futu ture Work rk

  • 1. Measure the resonant frequency of sapphire

suspension system

  • 2. Perform a cool down test in cryostat

14 The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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Su Summary

lWe performed test hanging using metal blade springs and fibers, then replaced metal components with sapphire in a step by step process. lWe tested the sapphire fibers strength using 6kg and 12 kg mass. 12 fibers survived the strength test. lWe successfully assembled and suspended the prototype sapphire suspension system.

15 The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017

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The End Thanks for your listening!

The 3rd KAGRA International Workshop @Academia Sinica, Taipei May 21st, 2017