the aei 10m prototype - university of...
TRANSCRIPT
![Page 1: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/1.jpg)
The AEI 10 m Prototype
June 2014 - Sina Köhlenbeck for the 10m Prototype Team
![Page 2: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/2.jpg)
The AEI 10m Prototype
The 10m Prototype
SQL Interferometer Suspensions
13.06.2014 2
Seismic attenuation system
Suspension PlatformInteferometer
![Page 3: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/3.jpg)
The AEI 10 m Prototype
Low noise test bed for multiple experiments• Prototype for future gravitational wave detectors
• Measurements at and below the Standard Quantum Limit
The AEI 10m Prototype13.06.2014 3
![Page 4: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/4.jpg)
Features of the 10 m Prototype
• Ultra high vacuum system
• Flexible configuration
• Seismic Attenuation System
The AEI 10m Prototype13.06.2014 4
![Page 5: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/5.jpg)
The Standard Quantum Limit (SQL)
What is quantum noise? Photon shot noise at high frequencies
Quantum radiation pressure noise at low frequencies
Photons in a coherent-state laser beam are not equally distributed
13.06.2014 The AEI 10m Prototype 5
Quantum radiation pressure noisePhoton shot noise
![Page 6: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/6.jpg)
The SQL
The SQL is the crossover between radiation pressure noise and shot noise
13.06.2014 The AEI 10m Prototype 6
![Page 7: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/7.jpg)
The SQL-Interferometer
Reduce all classical noise sources to be only limited by quantum noise
13.06.2014 The AEI 10m Prototype 7
![Page 8: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/8.jpg)
Horizontal isolation stage
13.06.2014 The AEI 10m Prototype 8
Optical table
Filter support
Base plate
![Page 9: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/9.jpg)
Vertical isolation stage
13.06.2014 The AEI 10m Prototype 9
Optical table
Filter support
Base plate
![Page 10: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/10.jpg)
Seismic Attenuation System
13.06.2014 The AEI 10m Prototype 10
![Page 11: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/11.jpg)
SAS vertical performance
13.06.2014 The AEI 10m Prototype 11
![Page 12: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/12.jpg)
Purpose of the SPI
Control of the longitudinal and angular position of two SAS relative to each other:
Longitudinal: 100pm/√Hz @ 10mHz
Angular:10nrad/√Hz @ 10mHz
The AEI 10m Prototype13.06.2014 12
![Page 13: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/13.jpg)
Working principle
The AEI 10m Prototype
Heterodyne Mach-Zehnder interferometers
Modulation bench outside the vacuum
Two diagnostic interferometers
Two measurement interferometers
Phase measurement with phasemeter
Differential wavefront-sensing (DWS)
13.06.2014 13
![Page 14: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/14.jpg)
Key features of the SPI
The AEI 10m Prototype
AOMs for heterodyne frequency offset
Nd:YAG NPRO Laser stabilized to iodine reference
Phasemeter developed for LISA Pathfinder
Digital signal processing with LIGO-style CDS
13.06.2014 14
![Page 15: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/15.jpg)
Key features of the SPI
The AEI 10m Prototype
Ultra-low thermal expansion glass base plate (Clearceram-Z Hs)
Quasi-monolithic fiber injectors
Bonded optics
13.06.2014 15
![Page 16: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/16.jpg)
Purpose of the diagnostic interferometer
- Long optical path until the base plate
- Measures (commonmode) noise
- Subtracted from measurement interferometers
The AEI 10m Prototype13.06.2014 16
![Page 17: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/17.jpg)
Performance of the diagnostic IFO
Performance limited by optical path length difference noise (OPD)
Caused by noise from the AOM drivers, stress in the fibers and on the modulation bench
Solution: OPD stabilization
The AEI 10m Prototype13.06.2014 17
![Page 18: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/18.jpg)
OPD stabilization
Phase measurement of the dignostic IFO
Digitally filtered signals
DAC provides analog signal
High voltage amplifier
Analog low pass filter
The AEI 10m Prototype13.06.2014 18
![Page 19: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/19.jpg)
OPD stabilization
Two PD‘s for each IFO
First PD is an in-loop sensor
Second PD is an out-of-loop sensor
Residual noise from electronics and phasemeter
The AEI 10m Prototype13.06.2014 19
![Page 20: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/20.jpg)
Performance of the OPD stabilization
The AEI 10m Prototype13.06.2014 20
![Page 21: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/21.jpg)
Performance of the OPD stabilization
High frequency noise cancelledby subtraction of common mode noise
The AEI 10m Prototype13.06.2014 21
![Page 22: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/22.jpg)
Performance of the OPD stabilization
High frequency noise cancelledby subtraction of common mode noise
Below 1Hz suppression by OPD stabilization
The AEI 10m Prototype13.06.2014 22
![Page 23: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/23.jpg)
Frequency Noise Interferometer (FNI)
Test for the Iodine Laser frequency stabilization
Test for the OPD stabilization
1m arm length miss match, on central table
Built with off the shelf UHV mounts
The AEI 10m Prototype
SPI
13.06.2014 23
![Page 24: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/24.jpg)
Performance of the FNI
Measurable because of the OPD stabilization
Frequency stabilization is working
Modelled 1/f slope frequency noise:40kHz/√Hz @ 1Hz
The AEI 10m Prototype13.06.2014 24
![Page 25: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/25.jpg)
Comparing diagnostic and frequency noise IFO
Subtraction reduces high frequency noise
FNI lower noise
Power and contrast better in FNI
The AEI 10m Prototype13.06.2014 25
![Page 26: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/26.jpg)
Comparing diagnostic and frequency noise IFO
Subtraction reduces high frequency noise
FNI lower noise
Power and contrast better in FNI
The AEI 10m Prototype13.06.2014 26
![Page 27: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/27.jpg)
The south interferometer (SIFO)
Measures the relative table displacement
Last mirror had to be adjusted inside the vacuum system
The AEI 10m Prototype13.06.2014 27
![Page 28: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/28.jpg)
SIFO Alignment
The AEI 10m Prototype13.06.2014 28
![Page 29: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/29.jpg)
Relative table motion
Inter table motion without any feedback from the SPI
All degrees of freedom controlled with table signals
Passive isolationand active control
The AEI 10m Prototype13.06.2014 29
![Page 30: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/30.jpg)
Relative table motion with SPI feedback
Stabilized with SPI and table signals
All degrees of freedom controlled
Between 100 and 10mHz suppression of 3 orders of magnitude
The AEI 10m Prototype13.06.2014 31
![Page 31: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/31.jpg)
Other degrees of freedom
• Optical lever for central tabel pitch and yaw
• Differential wavefront sensing
The AEI 10m Prototype13.06.2014 32
![Page 32: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/32.jpg)
Outlook
Build the optical lever
Investigate the rotational degrees of freedom
Implement the west arm
The AEI 10m Prototype13.06.2014 33
![Page 33: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/33.jpg)
The SQL-Interferometer
The AEI 10m Prototype13.06.2014 34
![Page 34: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/34.jpg)
Layout of the SQL Interferometer
The AEI 10m Prototype
Single arm test first!• Input power:5-30W
• Finess:670-130
• Circulating Power in arm cavity:~1kW
• Tunable cavity g factor
13.06.2014 35
![Page 35: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/35.jpg)
The AEI 10m Prototype
Upper stage
The SQL-Suspensions
Multi-stage pendula
100g mirrors
Silica fibers
13.06.2014 36
![Page 36: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/36.jpg)
The AEI 10m Prototype
The SQL-Suspensions
Upper stage
Intermediate stage
13.06.2014 37
![Page 37: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/37.jpg)
The AEI 10m Prototype
The SQL-Suspensions
Intermediate stage
Upper stage
13.06.2014 38
![Page 38: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/38.jpg)
The AEI 10m Prototype
The SQL-Suspensions
Intermediate stage
Penultimated mass
Test mass
Upper stage
13.06.2014 39
![Page 39: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/39.jpg)
Current status and outlook
Dirty suspension assembly
Dummy mass hanging
Assembly area
The AEI 10m Prototype
Pitch alignment
Clean suspension assembly
Transfer to vaccum system
13.06.2014 40
![Page 40: The AEI 10m Prototype - University of Tokyogwdoc.icrr.u-tokyo.ac.jp/DocDB/0024/G1402468/001/2014-02-13_10m.pdfThe AEI 10m Prototype June 2014 - Sina Köhlenbeck for the 10m Prototype](https://reader030.vdocuments.net/reader030/viewer/2022040401/5e753507680c9b37404a04e1/html5/thumbnails/40.jpg)
Thank you for your attention!
The AEI 10m Prototype13.06.2014 41