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MIF (ASC)
takafumi.ushiba - 19:07 Thursday 02 April 2020 (13955) Print this report
ADS progress for both ETMs

[Lucia, Ushiba]

In this morning, we tried to close the ADS loop  for YAW of ETMX and ETMY.
First, we saw the signals of OpLevs, TRX, and TRY.
Then, we found that ETMY YAW excitation excited ETMY PIT at the same time and PIT motion at this frequency is larger than YAW.
So, we started from optimization of drive align matrix.

However, even though we scaned enogh large range for Y2P matrix value, we couldn't find good values for diagonalization.
We don't know exact reason but maybe due to the resonance or damping filter, the phase of between PIT and YAW motion is not 0 or 180 degrees.
So, we gave up drive align matrix optimization.

What we can do is as follows:
1.Using higher frequenies for dither excitation.
2.Using TM OpLev set point to excite the Yaw motion.

We tok over he work to Nakano-kun.

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