Agenda/Minutes on 2020/10/2
CRY+VIS Interface Meeting
13:30-
Participants:
Cable bandling bellow BF.Cable bandling BF-CRYO.pdf
- Marionette Oplev Base
VIS Meeting
14:00-
Participants:
Progress report
General
- Sugiyama-san(ICRR, Uchiyama Lab.) will join VIS group, mainly for reinstallation of Type-A tower in Y-end.
- [Takahashi, Miyo, Ikeda] We plan to test the heater control at the cross tube in IX or IY on Oct. 20-21.
- Limit switches will be reviewed by SEO on Oct. 9th.
Type-A
Type-B
Report of the week of the 28th of September
Measured the resonant frequency of BS IP (15136). it's not too different to what I had measured with a higher temperature. I haven't measured the other ones.
I calculated we require to put 132 grams on top of BS Bottom Filter in order to bring F1 to nominal position at zero with the fishing rod in midrange. See Type-B remedying work document.
- Taking into account the weight of the F0 yaw stepper motor (330 grams) that we need to install, and the amount of ballast on F0 keystone (413 grams), we can see the F0 load is overweight by 50 grams.
To fix this, Hirata-san designed a new F0 keystone top plate far ligher than the current one (JGW-T2012090). It should work well.
- Next week I will go to the mine and put aside the 132 grams of ballast divided into two equal parts.
In the context of calculating the amount of ballast required in SR3 I realized that when moving the BF keystone to -1.47mm the system touches something and free oscillations stop (15122). This is not a problem currently but it should not happen. More investigation is required. It touches before the fishng rod reaches midrange.
Despite this problem it was able to roughly estimate we require to remove 76 grams from the IM and add 43 grams on top of the BF. See Type-B remedying work document.
- I calibrated (roughly) the keystone displacement in terms of stepper motor steps, and then calculated the total displacement all the way to midrange position, which is beyond the position where it currently touches. Using the spring constant I calculated we need to remove 76 grams.
F1 fishing rod is completely jammed -429 um.To bring it to nominal we need to remove 33 grams from its load. However, we will remove about 76 grams from the IM, which implies we'll need to add 43 grams on top of BF.
We have a record of the mass we put on top of SR3 IM (Type-B remedying work) and it seems hard to remove 76 grams in a symmetrical way. I'll need to design some masses that should allow us flexibility. Work in progress.
I opened a GitHub issue for concrete weekly TO DO lists (Type-B work TO DO list #85). I assigned Hirata-san, Washimi-san and myself.
Type-Bp
Type-C
Controls
Electronics
Towards O4
- RSE Trial was extended to Oct. 12th.
- Preparation work.
- The preparation work will be started on Oct. 8th.
- Cable removal.
- Schedule.
- Procedure documents.
- Criteria in the acceptance test.
- Presentation
- PAB (10/8)
- Chief Meeting (10/12)
Safety
Discussion
[Terrence] VIS health check system VISHack
- I have finished coding the essentials of the health check system and is ready to release the first version of it. What it can do:
Read a config file and do health check according to the config file Sample config.
- There's command line utilities to generate a sample config file.
- The config file specifies the tests that we want to do and the associated diaggui XML files or directories.
- For now, available tests are RMS, mean-square error, maximum absolute error. And, we can do tests with the data whitened by some reference data.
After doing the tests, we can choose to output a report of the health check. Sample report
- In the report, if there are any suspicious results, it will be in the alert section.
Travel Plans
The week from 10/5
- Takahashi: 10/7-10/9
- Sato: 10/7-10/9
- Hirata: 10/7-10/9
The week from 10/12
- Takahashi: 10/12-16
- Sato: 10/12-16
- Hirata: 10/12-16
Next meeting
- On 2020/10/9(Fri)