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R&D (FilterCavity)
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YuhangZhao - 16:01, Friday 30 October 2020 (2256)Get code to link to this report
Input mirror pitch DC output is reaching maximum (picomotor couldn't be moved to offload this DC ouput)

Today, when I align filter cavity, I found the output of Input pitch is very large. As shown in the first attached figure, the H3 coil has an output of 30,000. This is reaching the maximum of coil.

So I tried to offload this value with picomotor. However, there is an error coming out when I use labview to move picomotor. The error is shown in the attached figure 1. To fix this problem, I did following check:

  1. We tried to move PR picomotor, which worked. Therefore, the Labview should work well. And the network connection of the old PC should be also fine.
  2. We checked the ethernet cable connection to the picomotor box. But the cable is connected to a high cable (as shown in the attached figure 2). So it is not very easy to check if the cable is correct or not. But anyway, this cable is connected.
  3. We also tried to plug in and out the power cable for picomotor box, which didn't solve the problem.
  4. We checked also the IP address of picomotor box, which is consistent with the one used in Labview.

However, the picomotor still didn't work. I have already sent Takahashi-san an email to ask how to solve this problem.

Images attached to this report
2256_20201030080141_wxcamera1604035737498.jpg 2256_20201030080152_wxcamera1604035543598.jpg
Comments related to this report
YuhangZhao - 17:27, Friday 30 October 2020 (2257)

The problem is solved by using directly a long ethernet cable between computer and picomotor box.