KAGRA Logbook

MIF (General)

osamu.miyakawa - 10:27 Thursday 25 January 2018 (4025)

ETMY alignment, one day after pumping down using oplev

This mornign after puping down yesterday, SUM of oplev of TM of ETMY was reduced to around 5000. I move Payload Yaw picomotor to REV by 300steps x 38times by looking the SUM and each segment of QPD. Between 37 times to 38 times, Yaw moved from +180 to -180, I mean full rage of Yaw.

Pitch did not move mush, and SUM of Marionet oplev was back from severalhundreds to 27000.

Then I needed 300 steps x 27 times to have yaw to be in the linear range by hysterisis. I think some long term watching will be needed.

SUM of Marionet Oplev was reduce to several hundreds again.

Everything looks the same as yesterday.

Comments to this report:

osamu.miyakawa - 13:27 Thursday 25 January 2018 (4026)

13:20-13:24 300steps x 8 to REV were added to center yaw.

osamu.miyakawa - 9:42 Friday 26 January 2018 (4031)

This morniing, I added 300 steps x 9 FWD to center ETMY TM oplev.

Yesterday, I looked at several jumps in the dayitme , but no jump was found after evening to this morning.

osamu.miyakawa - 10:08 Tuesday 30 January 2018 (4043)

Still a lot of excitation can been seen. They are roughly once per 10 minutes.

I hear the current pressure is already 1e-4Pa. It is not easy to think that excitations happen due to the pumping down in such a high vacuum.

Hitting somewhere?

Images attached to this comment

osamu.miyakawa - 14:23 Tuesday 30 January 2018 (4049)

Picomotor diriver did not respond for ping. I unplugged the power cable at the bottom of bottom tap in the ETMY rack, and pulgged again.

Now it is responding for ping again.

>controls@k1ctr6:~$ ping 10.68.150.21
>PING 10.68.150.21 (10.68.150.21) 56(84) bytes of data.
>64 bytes from 10.68.150.21: icmp_seq=1 ttl=255 time=0.233 ms
>64 bytes from 10.68.150.21: icmp_seq=2 ttl=255 time=0.193 ms