Presentation is loading. Please wait.

Presentation is loading. Please wait.

G020342-00-Z Test Mass Butterfly Modes and Alignment Amber Bullington, Stanford University Warren Johnson, Louisiana State University LIGO Livingston Detector.

Published byHeather Gibbs Modified over 8 years ago

Similar presentations

Presentation on theme: "G020342-00-Z Test Mass Butterfly Modes and Alignment Amber Bullington, Stanford University Warren Johnson, Louisiana State University LIGO Livingston Detector."— Presentation transcript:

1 G020342-00-Z Test Mass Butterfly Modes and Alignment Amber Bullington, Stanford University Warren Johnson, Louisiana State University LIGO Livingston Detector Characterization Group

2 G020342-00-Z Introduction How can a vibrational mode of a test mass be used for alignment? What is the structure of a butterfly mode? How does the detected signal from the mode vary with changing the alignment of a resonant cavity?

3 G020342-00-Z The Butterfly Mode Two orientations of this mode exist »Plus mode »Cross mode The center of symmetry may be useful for centering a beam on a test mass + +- - + + -- Magnet

4 G020342-00-Z Simulation of Butterfly Modes Simulation by Dennis Coyne Calculated Frequency of vibration = 6640.811Hz Good Agreement with Measured Values No mode splitting predicted http://www.ligo.caltech.edu/~coyne/TM_modes/

5 G020342-00-Z Measuring Butterfly Mode Frequencies Drive the test mass with uniform noise »Arbitrary Waveform Generator »6000Hz-7000Hz »Amplitude  400 counts Lock an arm for the ETMs »Observe butterfly signal in AS_I »Turn on whitening filters AS1I, AS1Q on LSC panel »Note filters FM5 and FM6 under SUS LSC Lock the Power Recycled Michelson for the ITMs »Observe butterfly signal in REFL_I »Turn on whitening filters AS1I,AS1Q,RFI

6 G020342-00-Z Frequencies of Vibration, ETMx Lower Mode (plus) = 6648.01Hz Upper Mode (cross) = 6648.56Hz Amplitude Spectrum of Modes for ETMx

7 G020342-00-Z Frequencies of Vibration, ETMy Lower Mode (plus) = 6640.217Hz Upper Mode (cross) = 6640.665Hz Amplitude Spectrum of Modes for ETMy

8 G020342-00-Z Frequencies of Vibration, ITMx Lower Mode = 6695.978Hz Upper Mode = 6696.391Hz Amplitude Spectrum of Modes for ITMx

9 G020342-00-Z Frequencies of Vibration, ITMy Only one mode seen at 6694.2Hz Degenerate Modes? Sign of Suspension Problems or Damaged Magnet? Misidentified Mode? »ITMx and ITMy frequencies only 2Hz apart!

10 G020342-00-Z Q Measurements Excite mode with sinusoidal drive Stop the excitation and observe the ring down More Q plots on 7/8/02 LLO detector group log entries Decay of 6648.56Hz mode of ETMx

11 G020342-00-Z Summary of Frequencies Plus Mode Plus Mode Q Cross Mode Cross Mode Q ETMx 6648.01Hz2.1x10 6 6648.58Hz8.3x10 5 ETMy 6640.217Hz2.3x10 6 6640.665Hz8.8x10 5 ITMx 6695.978Hz~10 5 6696.391Hz~10 5 ITMy NA 6694.16Hz~6x10 3

12 G020342-00-Z Determination of Mode Structure How can the position of the nodal lines be determined? »Sinusoidal drive of desired mode »Misalign resonant cavity by known amounts –Misalign single arm for ETMs –Misalign power recycled michelson for ITMs »Measure signal amplitude from spectrum at different resonant configurations

13 G020342-00-Z Cavity Misalignment Radius of Curvature Optic Axis Beam Displacement ITM ETM

14 G020342-00-Z Mode Structure, ETMx ETMx map structure suggests lower mode at 6648.01Hz has “plus” structure Mapped with a single arm lock Map size = 23mm x 14mm Evidence of Plus Structure + +- -

15 G020342-00-Z Mode Structure, ETMy ETMy map structure suggests upper mode at 6640.67Hz has “cross” structure Mapped with a single arm lock initially misaligned near upper left Map size = 12mm x 8mm Evidence of Cross Structure + + --

16 G020342-00-Z Mode Structure, ITMy ITMy map structure suggests mode at 6694.2Hz may be a cross mode Mapped using the Power Recycled Michelson Cross Structure Evidence Anomaly

17 G020342-00-Z Alignment Butterfly mode was minimized by making slight changes in alignment Signal did not disappear entirely Altering the alignment of the fully locked interferometer »Signal decreased with misalignment - wrong trend! »Signal more susceptible to changes in power

18 G020342-00-Z Mode Coupling Driving one butterfly mode can excite the other mode Sinusoidal drive of upper mode of ETMy excites lower mode

19 G020342-00-Z Conclusion What can be done in the future? »Examine the phase of the detected signal w.r.t the drive signal »Create a “phase map” Automated alignment with the butterfly modes? »Modes ring up naturally when full interferometer acquires lock

20 G020342-00-Z Acknowledgements Many thanks to the staff at LIGO for a great learning experience Special thanks to the following people »Warren Johnson »Mark Coles National Science Foundation

Download ppt "G020342-00-Z Test Mass Butterfly Modes and Alignment Amber Bullington, Stanford University Warren Johnson, Louisiana State University LIGO Livingston Detector."

Similar presentations

19. October 2004 A. Freise Automatic Alignment using the Anderson Technique A. Freise European Gravitational Observatory Roma 21.10.2004.

19. October 2004 A. Freise Automatic Alignment using the Anderson Technique A. Freise European Gravitational Observatory Roma
Hiro Yamamoto LLO April 3, 2014 LIGO-G1400162 Core Optics related loss hierarchy of aLIGO Hiro Yamamoto LIGO/Caltech Introduction Loss related to geometry.

Hiro Yamamoto LLO April 3, 2014 LIGO-G Core Optics related loss hierarchy of aLIGO Hiro Yamamoto LIGO/Caltech Introduction Loss related to geometry.
RECOVERING HARDWARE INJECTIONS IN LIGO S5 DATA Ashley Disbrow Carnegie Mellon University Roy Williams, Michele Vallisneri, Jonah Kanner LIGO SURF 2013.

RECOVERING HARDWARE INJECTIONS IN LIGO S5 DATA Ashley Disbrow Carnegie Mellon University Roy Williams, Michele Vallisneri, Jonah Kanner LIGO SURF 2013.
Bicoherence studies on LLO data Vijay Chickarmane, Gabriela Gonzalez LSU Offline analysis of bicoherence of 6hrs of data, July 12, 2002 using functions.

Bicoherence studies on LLO data Vijay Chickarmane, Gabriela Gonzalez LSU Offline analysis of bicoherence of 6hrs of data, July 12, 2002 using functions.
Cascina, January 25th, 20051 Coupling of the IMC length noise into the recombined ITF output Raffaele Flaminio EGO and CNRS/IN2P3 Summary - Recombined.

Cascina, January 25th, Coupling of the IMC length noise into the recombined ITF output Raffaele Flaminio EGO and CNRS/IN2P3 Summary - Recombined.
Spring LSC 2001 LIGO-G010057-00-W E2 Amplitude Calibration of the Hanford Recombined 2km IFO Michael Landry, LIGO Hanford Observatory Luca Matone, Benoit.

Spring LSC 2001 LIGO-G W E2 Amplitude Calibration of the Hanford Recombined 2km IFO Michael Landry, LIGO Hanford Observatory Luca Matone, Benoit.
E3/E4 Line Noise Investigation LIGO-G010353-00-Z Sergey Klimenko Soma Mukherjee Bernard Whiting Bob Coldwell August 15, 2001 Outline  LLO line noise (E4.

E3/E4 Line Noise Investigation LIGO-G Z Sergey Klimenko Soma Mukherjee Bernard Whiting Bob Coldwell August 15, 2001 Outline  LLO line noise (E4.
LIGO NSF review, 11/10/05 1 AdLIGO Optical configuration and control Nov 10, 2005 Alan Weinstein for AdLIGO Interferometer Sensing and Control (ISC) and.

LIGO NSF review, 11/10/05 1 AdLIGO Optical configuration and control Nov 10, 2005 Alan Weinstein for AdLIGO Interferometer Sensing and Control (ISC) and.
LIGO-G050111-00-W LIGO Scientific Collaboration Meeting – LLO March 2005 1 Summary of recent measurements of g factor changes induced by thermal loading.

LIGO-G W LIGO Scientific Collaboration Meeting – LLO March Summary of recent measurements of g factor changes induced by thermal loading.
Matthew Evans, Ph237 April 20021 Application of Simulation to LIGO Interferometers  Who am I? »Matthew Evans, Ph.D. from Caltech on Lock Acquisition 

Matthew Evans, Ph237 April Application of Simulation to LIGO Interferometers  Who am I? »Matthew Evans, Ph.D. from Caltech on Lock Acquisition 
Frequency Response of LIGO Interferometers Andrew Weber University of Maryland (no relation) SURF Student Lecture Series Advisor: Andri Gretarsson.

Frequency Response of LIGO Interferometers Andrew Weber University of Maryland (no relation) SURF Student Lecture Series Advisor: Andri Gretarsson.
Calibration of TAMA300 in Time Domain Souichi TELADA, Daisuke TATSUMI, Tomomi AKUTSU, Masaki ANDO, Nobuyuki KANDA and the TAMA collaboration.

Calibration of TAMA300 in Time Domain Souichi TELADA, Daisuke TATSUMI, Tomomi AKUTSU, Masaki ANDO, Nobuyuki KANDA and the TAMA collaboration.
ALLEGRO G050208-00-Z LSC, Livingston 23 March, 2005 1 Calibration for the ALLEGRO resonant detector -- S2 and S4 Martin McHugh, Loyola University New Orleans.

ALLEGRO G Z LSC, Livingston 23 March, Calibration for the ALLEGRO resonant detector -- S2 and S4 Martin McHugh, Loyola University New Orleans.
Generation of squeezed states using radiation pressure effects David Ottaway – for Nergis Mavalvala Australia-Italy Workshop October 2005.

Generation of squeezed states using radiation pressure effects David Ottaway – for Nergis Mavalvala Australia-Italy Workshop October 2005.
LIGO-G010406-00-D Commissioning PAC11, 2001 Daniel Sigg, LIGO Hanford Observatory.

LIGO-G D Commissioning PAC11, 2001 Daniel Sigg, LIGO Hanford Observatory.
Optical Configuration 03.11.2008 Advanced Virgo Review Andreas Freise for the OSD subsystem.

Optical Configuration Advanced Virgo Review Andreas Freise for the OSD subsystem.
Test mass dynamics with optical springs proposed experiments at Gingin Chunnong Zhao (University of Western Australia) Thanks to ACIGA members Stefan Danilishin.

Test mass dynamics with optical springs proposed experiments at Gingin Chunnong Zhao (University of Western Australia) Thanks to ACIGA members Stefan Danilishin.
1 The Status of Melody: An Interferometer Simulation Program Amber Bullington Stanford University Optics Working Group March 17, 2004 G040131-00-D.

1 The Status of Melody: An Interferometer Simulation Program Amber Bullington Stanford University Optics Working Group March 17, 2004 G D.
Amaldi conference, June 2005 1 Lock acquisition scheme for the Advanced LIGO optical configuration Amaldi conference June24, 2005 O. Miyakawa, Caltech.

Amaldi conference, June Lock acquisition scheme for the Advanced LIGO optical configuration Amaldi conference June24, 2005 O. Miyakawa, Caltech.
SQL Related Experiments at the ANU Conor Mow-Lowry, G de Vine, K MacKenzie, B Sheard, Dr D Shaddock, Dr B Buchler, Dr M Gray, Dr PK Lam, Prof. David McClelland.

SQL Related Experiments at the ANU Conor Mow-Lowry, G de Vine, K MacKenzie, B Sheard, Dr D Shaddock, Dr B Buchler, Dr M Gray, Dr PK Lam, Prof. David McClelland.

Similar presentations

Ads by Google