Differences between revisions 26 and 27

Simulation Tools

Comparison of simulation tools for LCGT

Several simulation tools with theoretical line using LCGT 2007 parameters are compared here, FINESSE, Thomas, Oprickle. Except for FINESSE.

Theoretical: just analytical way shown in LCGT design document on page 14.
FINESSE: 'ps2S' and 'scale meter' commands are used for the unit in m/rHz and 'fig' command are used to produce excitations in frequency domain. FINESSE seems to have a bug of a factor by sqrt(2), but it can be compensated later if you know this information to match other results.
Thomas: Developped by Thomas Corbit. Visual C++ besed, running only Windows machine. This is the first simulation tool which can calculate quantum effect using two-photon modes.
Optickle: Very flexible simulation tool. You can use a full set of Matlab functions. This tool also can calculate full quantum effect. Optickel RF calculation seems to have a bug of a factor by sqrt(2) for the radiatoin pressure noise, but DC readout calculation is OK. This bug can be compensated to put 2*sqrt(2) instead of 2 on the setMechTF function but radiation pressure noise for DC readout will be larger by a factor of sqrt(2) in this case.

Optickle RF result is lower by a factor of sqrt(2) than other results due to the bug explained above.

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-Optickle uses vacuum injections from dark port and other lossy ports on this model due to introduce quantum noise, so Optickle result with RF detection is worse than other calculation like Thomas's DC readout. Calculation above this model assumed ideal flat shot noise, so all the results were matched well.
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+Optickle RF result is lower by a factor of sqrt(2) than other results due to the bug explained above.