With Lucia and Yamamoto-kun.

Summary

We went ot the tunnel and realized the IP coil driver is broken. Its number is S1706250.

Details

Before going to the tunnel, at the control room we did some tests, which failed:

• We tried moving the IP with DC actuation and also with a line and
• We tried measuring a transfer function.

Nevertheless, we were able to move the IP using the horizontal fishing rods, which suggested the problem was outside the vacuum chamber. The current position of the IP is as follows:

• L: -74 µm,
• T: -47 µm and
• Y: 4034 µrad,

which is relatively close to the set point (see the commented entry).

In the tunnel we realized the coil driver was off. We turned it on but after a few seconds it turned itself off. According to what I have heard from experts this symptom suggests an electrical ground problem. We need to replace the coil driver.