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VIS (IY)
lucia.trozzo - 17:21 Wednesday 01 April 2020 (13932) Print this report
Comment to ITMY IP H2 coil was satulated (13922)

The IY IP coil outputs are still to large and this means that the IP is still far from the nominal set point. To reduce the coil outputs so to have ess than 3000 counts for each one, I moved a bit more the stepping motors.
Below some detail of this work.
The IP set point is

    L: 100 um,
    T: 200 um
    Y: -706 urad.

To measure how far the IP was far from the set point I requested towe damped to guardian, I turned off the BF_Y and IP loops and I monitored the ITMY_IP_DAMP_{L,T,Y}_IN1 signal:

    L: 250 um
    T: 300 um
    Y: -25 urad

To reduce these values, I moved L and T stepping motors:

-Pic1 shows the total numbers of the step done to bring the IP close to the nominal position

Pic1 shows the IP_DAMP_{L,T,Y}_IN1 and ITMY_IP_{H1,H2,H3}_COILOUT before and after the IP position done with stepping motors.

The coil outputs are less than 2000 counts.

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