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 · Taipei 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
USST - University of Shanghai for Science and Technology KIW3 · Taipei 3
Suzhou H&L Instruments LLC KIW3 · Taipei 4
Background of 247 th EFST in 2014 247 th EFST A-C Roundtable KIW3 · Taipei 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
Agreement at 247 th EFST KIW3 · Taipei 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。
Visited Advanced LIGO, 2015.2 KIW3 · Taipei
All Experts Related with USST KIW3 · Taipei 美国加州理工学院 日本东京大学 LIGO执行主任 KAGRA执行主任 David Reitze博士 Takaaki Kajita教授 美国加州理工学院 英国格拉斯哥大学 LIGO执行副主任 GEO600发言人 Albert Lazzarini博士 Sheila Rowan教授 美国加州理工学院 美国佛罗里达大学 LIGO首席科学家 LIGO 主要成员 Stan Whitcomb博士 David Tanner教授 澳大利亚西亚大学 台湾清华大学 ACIGA执行主任 Wei-Tou Ni教授 David Blair教授
Transmission Flat vs LIGO Mirror TF LIGO Mirror Sample: �[�1 2 − � 2 8ℎ 2 � Δℎ] 2 + ( � 4ℎ Δ�) 2 δ = Δ� R =6.0 m = (4ℎ 2 + � 2 ) 8ℎ ⁄ � � D =50 mm
Three Ideal Flats Generated by Zernike KIW3 · Taipei Flat A ： PV = l /20.3 Flat B ： PV = l /9.6 Flat C ： PV = l /35.5
Testing Principle KIW3 · Taipei Fizeau Laser Interferometer TF Flat
Testing Procedure KIW3 · Taipei Step 1 ： BxA Step 2 ： BxA-90 Step 3 ： CxA Step 4 ： CxB
Result of Three-Flat Testing KIW3 · Taipei Flat A’ ： PV = l /20.3 Flat B’ ： PV = l /9.6 Flat C’ ： PV = l /35.5
Difference bwt Ideal & Testing Surface KIW3 · Taipei Flat A – A’ ： PV =0 nm Flat B – B’ ： PV = 0 nm Flat C – C’ ： PV = 0 nm
Extension Analysis — Deadweight (DW) KIW3 · Taipei PV = 6.13nm ， H=30.0mm ， Flat PV = 6.64nm ， H=27.5mm ， TF
Figure Error Caused by Deadweight KIW3 · Taipei PV=6.46mm
Difference bwt Ideal & Testing with DW KIW3 · Taipei 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.
Real Measurement KIW3 · Taipei 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
Testing Result of TF A KIW3 · Taipei PV ： 26.76 nm RMS ： 5.70 nm
Testing Result of TF B KIW3 · Taipei PV ： 19.28 nm RMS ： 4.32 nm
Testing Result of TF C KIW3 · Taipei PV ： 29.36 nm RMS ： 6.88 nm
A：National Standard Flat C2 Ab=BA-B Ac=CA-C PV: 0.090 l PV: 0.083 l PV: 0.085 l RMS: 0.0169 l RMS: 0.0154 l RMS: 0.0153 l B：H&L Instruments TF Ba=BA-A Bc=CB-C PV: 0.052 l PV: 0.044 l PV: 0.058 l RMS: 0.0073 l RMS: 0.0048 l RMS: 0.0073 l C： National Standard Flat C1 Ca=CA-A Cb=CB-B PV: 0.053 l PV: 0.057 l PV: 0.051 l RMS: 0.0059 l RMS: 0.0073 l RMS: 0.0046 l H&L solved the hard problem of closed-loop for absolute testing
High Accurate Flat — l /50PV KIW3 · Taipei PV = 12.64 nm, RMS = 1.43 nm
Reproducibility KIW3 · Taipei After one day, absolute testing was repeated. Flat A' RMS Difference = 2nm
Absolute shape changed with temperature KIW3 · Taipei PV：345.94nm RMS：103.99nm 30 ℃ PV：111.63m Temperature Change RMS：29.95nm PV：72.34m RMS：17.85nm 25 ℃ PV：49.15nm RMS：10.18nm
Special Interferometer for LIGO Mirror 247 th EFST A-C Roundtable KIW3 · Taipei
Measurement Results - Final ROC 247 th EFST A-C Roundtable KIW3 · Taipei Retrace Error of Real System 1.84 nm PV and 0.26 nm RMS at 4-fringe tilt and average of 60 sets after the accurate alignment 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. 3-FLAT TEST • PV=10nm for difference bwt 2 independent measurements RMS=1nm after removing both focus and astigmatism The ROC was independently established to be 6 km. Three measurement results: 5.84 km, 5.85 km, and 5.87 km. 27
Summary / Future 247 th EFST A-C Roundtable KIW3 · Taipei Digital phase shifting interferometer Neutron Star Formation Absolute measurement Solution of closed-loop for absolute testing High accuracy PV l /100 Image credit: NASA Temperature effect Deadweight issue ROC error 2.5% GWO - Gravitational-Wave Observatory 1. Keeping talking at this workshop 2. Cooperating with all of you on testing super large ROC mirror
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