LIGO Document G1700563-v1

CSWG Workshop at the March 2017 LVC meeting

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CSWG Workshop at the March 2017 LVC meeting
Friday 17 March 2017
San Diego Room

Workshop Goals/Aims
* Brainstorming
* Define problems
* Review attempted solutions to date
* Postulate promising approaches

* Angular Control
* Feedback optimization
but we can discuss other controls issues/concerns if/as time allows

APPROXIMATE AGENDA (we will be flaxible & adapt):

9:00 am Goals & Agenda

***Angular Control Issues***
9:10 am LIGO Angular Control Issues
- review recent angular control noise talks
- define/discuss problem
- what is known, unknown?
- what models, data, tools exist?
10:10 break
10:30 am GEO Angular Control Issues
11:00 am VIRGO Angular Control Issues
11:30 am wrap up discussion on angular control issues

12:00 break for lunch (not catered --> on your own)

*** Hierarchical Control Design***
1:30 pm LIGO: Particle Swarm Optimization (PSO) applied to the DARM hierarchical loop design
2:00 pm GEO Hierarchical Control Design
2:30 pm VIRGO Hierarchical Control Design
3:00 pm wrap up discussion on Hierarchical Control Design

3:30 pm other issues/topics?

Files in Document:
Other Files:
Notes and Changes:
CSWG Workshop @LVC meeting, March 2017

LIGO Angular Control Issues

  1. Rana Adhikari et. al., Global Controls Length to Angle Decoupling, LVC 2017, G1700414
  2. Rana Adhikari, Noise Status Update, G1700320
  3. Brett Shapiro, Estimators for Lower Noise AS Control, G1700253
  4. Arnaud Pele et. al., L2A or The Angle-from-Length disentanglement, CSWG mtg, 3 Feb 2017 - see
  5. Rana Adhikari, Something about Angular Controls, G1601355-v2, Jun 2016
  6. Jenne Driggers, Angular Controls Considerations, GWADW 2016 -- see
  7. Marie Kasprzack, ASC Update from LLO, G1501367-v1, 11-Oct-2015
  8. Lisa Barsotti, ASC discussion at MIT Commissioning f2f, G1501364-v2, Nov 2015
  9. ASC wiki pages:
  10. ISC modeling software see

  11. ISC modeling:
  12. ASC Noise Budget :

General relevant LIGO references

  1. Simulink NB modeling toolkit:
  2. Remote Data Access Matlab Tools:
  3. Quad Suspension Controls Arrangement Poster, E1000617-v6, 7 Mar 2017
  4. Paul Fulda, Interferometric sensing and control in Advanced LIGO, G1501334-v2, 20 Nov 2015



Hierarchical Feedback Optimization

  1. github controls problems:

  2. Rana Adhikari, Why Optimize our controls?, CSWG elog #11198:

  3. Rana Adhikari, Optimization of Feedback Loops, G1600608
  4. Brett Shapiro et al., Hierarchical Control Notes Blending Style, G1200692
  5. Brett Shapiro, Hierarchical Control Theory for Advanced LIGO, T1000242
  6. Brett Shapiro, Particle Swarm Optimization for Quad Damping Update:

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