LIGO Mirror Diagnosis and Requirement SEN HAN University of - - PowerPoint PPT Presentation

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LIGO Mirror Diagnosis and Requirement SEN HAN University of - - PowerPoint PPT Presentation

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The 3rd KAGRA International Workshop (KIW3) LIGO Mirror Diagnosis and Requirement SEN HAN University of Shanghai for Science and Technology Suzhou H&L Instruments LLC Academia Sinica (NTU campus), Taipei May 21-22, 2017 Outline KIW3

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The 3rd KAGRA International Workshop (KIW3)

LIGO Mirror Diagnosis and Requirement

SEN HAN

University of Shanghai for Science and Technology Suzhou H&L Instruments LLC Academia Sinica (NTU campus), Taipei May 21-22, 2017

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 Introduction to USST  GW Detection Activities at USST  LIGO Mirror Requirements  Absolute Measurement for High Accuracy  Testing Super Large ROC Mirror

  • Interferometer design
  • Measurement results

 Summary Outline

KIW3 · Taipei

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USST - University of Shanghai for Science and Technology

KIW3 · Taipei

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Suzhou H&L Instruments LLC

KIW3 · Taipei

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 Chairs

  • Professor Songlin Zhuang, Academician
  • Professor Jun Luo, Academician
  • Professor Nenghong Zhu, Academician

 Meeting at Caltech

  • LIGO Director: Prof. David Reitze
  • LIGO Deputy Director: Prof. Albert Lazzarini
  • Chief Scientist: Dr. Stanley Whitcomb
  • With the help of Dr. Garrett Cole

 Support by both EFST and USST Background of 247th EFST in 2014

A-C Roundtable 247th EFST KIW3 · Taipei

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随着科学技术的飞速发展，中国应积极参与到引力波这项基础科学的研究领域中，在已有的研究基础上，集中国内的科 研力量，制定完整的路线图和具体的探测方案，同时也应使更多的学者和科学家参与到国际探测引力波的合作中，从而 培养自己的科研队伍，为世界科学发展贡献自己的一份力量。

Agreement at 247th EFST

KIW3 · Taipei

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Visited Advanced LIGO, 2015.2

KIW3 · Taipei

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美国加州理工学院 LIGO执行副主任 Albert Lazzarini博士 日本东京大学 KAGRA执行主任 Takaaki Kajita教授 英国格拉斯哥大学 GEO600发言人 Sheila Rowan教授 美国佛罗里达大学 LIGO 主要成员 David Tanner教授 美国加州理工学院 LIGO首席科学家 Stan Whitcomb博士 美国加州理工学院 LIGO执行主任 David Reitze博士 澳大利亚西亚大学 ACIGA执行主任 David Blair教授 台湾清华大学 Wei-Tou Ni教授

All Experts Related with USST

KIW3 · Taipei

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Sample: R =6.0 m D =50 mm

δ = Δ

  • =

[1 2 − 2 8ℎ2 Δℎ]2 + ( 4ℎ Δ)2 (4ℎ2 + 2) 8ℎ ⁄

Transmission Flat vs LIGO Mirror

TF LIGO Mirror

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Flat A：PV = l/20.3 Flat B： PV = l/9.6 Flat C： PV = l/35.5 KIW3 · Taipei

Three Ideal Flats Generated by Zernike

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Flat TF

Fizeau Laser Interferometer

KIW3 · Taipei

Testing Principle

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Step 2：BxA-90 Step 1：BxA Step 4：CxB Step 3：CxA

KIW3 · Taipei

Testing Procedure

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Flat A’：PV = l/20.3 Flat B’： PV = l/9.6 Flat C’： PV = l/35.5 KIW3 · Taipei

Result of Three-Flat Testing

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Flat A – A’：PV =0 nm Flat B – B’： PV = 0 nm Flat C – C’： PV = 0 nm KIW3 · Taipei

Difference bwt Ideal & Testing Surface

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PV = 6.13nm，H=30.0mm，Flat PV = 6.64nm，H=27.5mm，TF

KIW3 · Taipei

Extension Analysis — Deadweight (DW)

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KIW3 · Taipei

Figure Error Caused by Deadweight PV=6.46mm

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A - A’ 表面：PV = 0 nm B - B’ 表面： PV = 0 nm C - C’ 表面： PV = 0 nm

Further simulation shows: Assumed that SW figure error is changed from 6.46nm to15.17nm， Testing error from SW is still PV = 0. KIW3 · Taipei

Difference bwt Ideal & Testing with DW

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Model：HOOL L9600A Company: Suzhou H&L Instruments Aperture 6inch (150mm) Wavelength 632.8nm TF PV λ/20 Precision λ/600 Repeatability (PV) λ/500 Repeatability (RMS) λ/1000 Alignment Two spots Feature Non-stress Size 798×598×1078mm Power 220V 50Hz KIW3 · Taipei

Real Measurement

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PV： 26.76 nm RMS： 5.70 nm

KIW3 · Taipei

Testing Result of TF A

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PV： 19.28 nm RMS： 4.32 nm

KIW3 · Taipei

Testing Result of TF B

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PV： 29.36 nm RMS： 6.88 nm

KIW3 · Taipei

Testing Result of TF C

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A：National Standard Flat C2 Ab=BA-B Ac=CA-C B：H&L Instruments TF Ba=BA-A Bc=CB-C Ca=CA-A Cb=CB-B PV: 0.090 l RMS: 0.0169 l PV: 0.083 l RMS: 0.0154 l PV: 0.085 l RMS: 0.0153 l PV: 0.052 l RMS: 0.0073 l PV: 0.044 l RMS: 0.0048 l PV: 0.058 l RMS: 0.0073 l PV: 0.053 l RMS: 0.0059 l PV: 0.057 l RMS: 0.0073 l PV: 0.051 l RMS: 0.0046 l C： National Standard Flat C1

H&L solved the hard problem of closed-loop for absolute testing

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PV = 12.64 nm, RMS = 1.43 nm KIW3 · Taipei

High Accurate Flat — l/50PV

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After one day, absolute testing was repeated. RMS Difference = 2nm

Flat A'

KIW3 · Taipei

Reproducibility

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30℃ 25℃ Temperature Change

PV：345.94nm RMS：103.99nm PV：111.63m RMS：29.95nm PV：72.34m RMS：17.85nm PV：49.15nm RMS：10.18nm

KIW3 · Taipei

Absolute shape changed with temperature

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Special Interferometer for LIGO Mirror

A-C Roundtable 247th EFST KIW3 · Taipei

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The ROC was independently established to be 6 km. Three measurement results: 5.84 km, 5.85 km, and 5.87 km.

Measurement Results - Final ROC

Simulated Retrace Error Using Ray Tracing Software 2.11 nm PV with tilt term for 4 fringes, 0.56 nm PV after removal of tilt term. Retrace Error of Real System 1.84 nm PV and 0.26 nm RMS at 4-fringe tilt and average

  • f 60 sets after the accurate alignment

A-C Roundtable

3-FLAT TEST

  • PV=10nm for difference

bwt 2 independent measurements RMS=1nm after removing both focus and astigmatism

247th EFST KIW3 · Taipei

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Digital phase shifting interferometer

Absolute measurement

Solution of closed-loop for absolute testing

High accuracy PV l/100

Temperature effect

Deadweight issue

ROC error 2.5% Summary / Future

GWO - Gravitational-Wave Observatory

  • 1. Keeping talking at this workshop
  • 2. Cooperating with all of you on testing super

large ROC mirror

A-C Roundtable 247th EFST KIW3 · Taipei

Neutron Star Formation Image credit: NASA