KAGRA Logbook

VAC (General)

takahiro.yamamoto - 17:50 Tuesday 24 December 2024 (32116)

vacuum alert for new channels

Vacuum alert for new channels which are the readout pressure value near GVs were enabled.

Current thresholds are as follows.

[BS] KGRVAC:CCG_BSY_01:VAL:PRESS = 8.0e-6
[IX] KGRVAC:CCG_X00_01:VAL:PRESS = 6.5e-6
[EX] KGRVAC:CCG_X30_01:VAL:PRESS = 1.0e-4
[IY] KGRVAC:CCG_Y00_01:VAL:PRESS = 5.5e-6
[EY] KGRVAC:CCG_Y30_01:VAL:PRESS = 8.2e-6

Behavior of each readout value is as follows (see also https://gwdet.icrr.u-tokyo.ac.jp/~controls/capture/img/k1mon10-1920x0.jpg).

[BS] readout value fluctuates between 7.8e-6 ~ 7.9e-6 Pa.
- It’s probably a numerical rounding of the actual value around 7.85e-6 Pa (?)
[IX] readout value shows 6.3e-6 Pa in almost time.
- But large value sometimes appears like as glitch (roughly once per hour?)
- If notification is annoying, I’ll set more large value as temporal.
[EX] readout value fluctuates a lot (6.5e-6 ~ 2.0e-5 Pa)
- So I will wait to set proper threshold until a problem will be fixed.
[IY] readout value is stably 5.3e-6 Pa.
[EY] readout value fluctuates between 8.0e-6 ~ 8.1e-6 Pa.
- It’s probably a numerical rounding of the actual value around 8.05e-6 Pa (?)

Notification with strict threshold seems to work well for BS, IY and EY.
On the other hand, we need to remove strange behavior on readout for IX and EX in order to set meaningful threshold.

Now I set a strict threshold for BS, IY, EY and IX. So the notification about IX may become annoying because of glitch like behavior.
If it will become an interruption of catching up another important notification, I'll disable the notification for IX.

-----
As I reported in klog#32112, because channel name doesn't follow KAGRA convention, ezca on guardian cannot be used.
For this reason it's implemented by using caget which requires much higher CPU cost than ezca.
So it's difficult to increase a number of channel that are monitored by guardian. After converting them as proper name (K1:***), all caget must be replaced to ezca.

Comments to this report:

takashi.uchiyama - 8:13 Thursday 26 December 2024 (32134)

2024/12/25

Ohmae, Hayakawa, Kimura (remote), Kamikubota(remote), Nakagaki(remote), UChiyama

We performed exchanging of the circuit of CC-10 used for the GV interlock system at EX.
The exchange works done and value on the CC-10 was hte order of 10^-6Pa. it looks normal.
It was strange that the vacuum pressure value on the medm screen shows 97000.

Finally, Nakagaki-sama pointed out we needed to set proper parameter on new CC-10 circuit in order to send vacuum presure data to EPICS.
Today, we will go to Xend and set the parameter on the new CC-10.

During the exchange works I changed the following parameters,
* Input calibration ID as 1960-14
* Input setpoint value as SP3L = 1.0*10^-4Pa and SP3H = 2.0*10^-4Pa.

takashi.uchiyama - 15:25 Thursday 26 December 2024 (32150)

2024/12/26

Nakagaki, Kimura(remote), Uchiyama

We input the proper network setting into the CC-10 used for the interlock system at EX. The vacuum pressure value of CC-10 is now shown on the medm screen, and we can see the plot.
https://gwdet.icrr.u-tokyo.ac.jp/~controls/capture/img/k1mon10-1920x0.jpg

We noticed that the vacuum pressure value (X30) still fluctuates significantly.

shinji.miyoki - 15:25 Thursday 26 December 2024 (32153)

The CC-10 body change is desirable?