Introduction to SIS
The SIS manual is available [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=160 here].
Getting started
SIS is available on a couple of the control room machines (e.g. rossa) and on menkar.ligo.caltech.edu (fast).
There is a SIS directory on the 40m SVN (https://nodus.ligo.caltech.edu:30889/svn/trunk/SIS/) which contains some ongoing work on e.g. LG33 beams.
To run SIS type sis at the command line. This will open the program and give you a choice of configurations.
Typing e.g. FP will open a simulation of a single Fabry-Perot arm cavity.
Typing lock will run the simulation and lock the cavity.
Things you might want to do
Define a simulation
When running SIS it looks in the current directory for (when looking at a FP cavity) a file called sisDB_FP.mcr.
You can place all simulation parameters in this file. The options are outlined in the manual and can be viewed using the simSpec command.
For example
simSpec
ITM
will return something like
ITM.aperture = 0.34
ITM.thickness = 0.2
ITM.Wfft = 0
ITM.mech.x = 0
ITM.mech.y = 0
ITM.mech.z = 0
ITM.mech.tX = 0
ITM.mech.tY = 0
ITM.mech.tZ = 0
ITM.opt.T = 0.014
ITM.opt.R = 0.986
ITM.opt.ROC = 2076
ITM.opt.refrIndex = 1.44963
etc
These parameters can also be changed within SIS by typing e.g. ITM.opt.ROC = 2000 within the simSpec environment.
Lock a cavity
Typing lock at the main screen will run SIS and lock the cavity. There are two options which you might want to change here.
inputBeam.matchToCavity takes care of mode matching the beam to the cavity by changing the input beam waist and position. These va
Run simulations in a loop
Sweep the cavity length
Use your own mirror map