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Injection system (Mode cleaner length lock on ref cavity)
Vajente, Chiummo, Ruggi - 11:45 Monday 07 June 2010 (26812) Print this report
New filter for MC z lock
Some SSFS problems we had in the past days were due to an instability of the IMC longitudinal lock on SSFS correction. Measurements showed quite bad stability margins (around 12 degrees of phase margin).

Today we implemented a new control filter (which is used both for IMC lock on RFC and on SSFS corr) which improves the stability margins at the price of increasing a bit the high frequency correction.

Some noise injection periods:

Noise MC_z ampl 1e-5 (ISYS standalone)
Time: Jun07,10-09:37:04 -> GPS: 959931439
Time: Jun07,10-09:40:49 -> GPS: 959931664
Noise MC_z ampl 1e-5 (ISYS standalone, new filter)
Time: Jun07,10-11:29:41 -> GPS: 959938196
Time: Jun07,10-11:31:42 -> GPS: 959938317
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