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Why use FinesseTools for Advanced Virgo simulations, a simple example .

Why use FinesseTools for Advanced Virgo simulations, a simple example. Stefan Hild (University of Birmingham) + A.Freise, M.Mantovani, A.Perreca Advanced Virgo telecon, June 2008. Outline. Motivation: Why to use FinesseTools for OSD-work? Infrastructure for OSD-Simulations

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Why use FinesseTools for Advanced Virgo simulations, a simple example .

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  1. Why use FinesseTools for Advanced Virgo simulations, a simple example. Stefan Hild (University of Birmingham) + A.Freise, M.Mantovani, A.Perreca Advanced Virgo telecon, June 2008

  2. Outline • Motivation: Why to use FinesseTools for OSD-work? • Infrastructure for OSD-Simulations • Advanced Virgo OSD_Tools SVN • Example of an OSD_Tool_function • Calculating the mirror ROCs for a given beam size • Current baseline of ROCs for main and recycling mirrors Advanced Virgo, 19th of June 2008

  3. Introduction: Why to use FinesseTools for OSD simulation work • We need to do plenty of simulations for Advanced Virgo • Many of these simulation task are fairly big constructs (for instance producing control matrix) • Many parameters are not fixed and might change several times within the next year or so • For instance: mod frequencies, Schnupp asymmetry, ... • Many design options are available which might completely change everything • For instance degenerate recycling cavities • We will have to do the simulations many times, with several parameter set, several optimization criteria … Advanced Virgo, 19th of June 2008

  4. Introduction: Why to use FinesseTools for OSD simulation work • IDEA: Build up a collection of (semi) automated scripts and functions, called OSD_Tools For instance for: • Calculating the mirror ROCs for a given beam size • Calculating the optimal Schnupp length for given modulation frequencies • Calculating the length of the SR-cavity for given Schnupp length and modulation frequency • Calculating an optimized Control matrix for a given IFO configuration • These scripts and functions always read in the current Advanced Virgo parameter set (from Finesse baseline file) and give back an optimized parameter set. • Example scenario: • Suppose the length of one recycling cavity changes • Need to redo the full length control scheme (including all noise propagations). • OSD_Tools can make things easier, more reliable and better documented. Advanced Virgo, 19th of June 2008

  5. Infrastructure: OSD-SVN • A dedicated SVN for OSD Simulation effort • All scripts and input files are stored in a subversion repository including backup and version control. • This svn can be read by the public: • Server: svn://lnx0.sr.bham.ac.uk • Repository: adv-osd • Everybody is welcome to join … Advanced Virgo, 19th of June 2008

  6. Infrastructure: OSD-SVN • Four main directories • Finesse-files: • Current and Previous input files (Parameter documentation) • OSD-tools: • Top Level OSD-function • FinesseTools • Tasks: • Example scripts how to run the Top Level OSD-functions Advanced Virgo, 19th of June 2008

  7. Example: Determine the mirror ROCs for a given beam size • The value for the Advanced Virgo beam size is likely to change in future: • There is a current baseline value (6.0cm) • New info about … • Size of flats • Geometry and type of actuators • FFT simulations … will make it necessary to modify the beam size • The lengths of the recycling cavities is not fixed: • For each length the recycling mirrors need to have a an adjusted curvature • Every time the beam size or the cavity lengths changes we have to recalculated all the curvatures of the mirrors. • It would be nice doing these calculations always by just pressing a single button (I.e. running a single function.) Advanced Virgo, 19th of June 2008

  8. OSD_ROC.m: What does it do? • Reads in the current an Advanced Virgo configuration from the current Advanced Virgo Finesse file (advirgo-base-xxxxxx.kat) • Switches off all cavity commands and use the pure eigenmode of the arm cavities. • Produce and run new Finesse simulation: beam size over main mirror ROC • Find main mirror ROC value corresponding to the wished beam size • Repeat step 3. and 4. with higher resolution (2nd iteration) • Write the new ROC value to the main mirrors. • Produce and run new Finesse simulation: beam parameter detector at the recycling mirrors • Calculates from z and z_r values the wavefront curvature of the recycling mirrors. • Writes a new Advanced Virgo input file, containing the new ROC values. (This file can then be used by the next OSD-Tool-function…) Advanced Virgo, 19th of June 2008

  9. OSD_ROC.m: What does it do? • For further detail, please look at the help of the function: Advanced Virgo, 19th of June 2008

  10. Current baseline for beam size and mirror curvatures Advanced Virgo, 19th of June 2008

  11. Documentation on the Wiki • Available on the AdV-OSD-Wiki: • Very brief summary of beamsize analysis • Current working values for mirror curvatures https://workarea.ego-gw.it/ego2/virgo/advanced-virgo/osd/beam-sizes Advanced Virgo, 19th of June 2008

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