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Reports until 10:36, Friday 16 May 2014
H1 SEI
fabrice.matichard@LIGO.ORG - posted 10:36, Friday 16 May 2014 (11939)
Turning ON a full SEI chamber with a single click button...

... it's finally there, thanks to Jamie's great work.

 

This morning we used ITMY to fine tune the parameters. After increasing the HEPI Boost filters ramping time from 5s to 10s on the vertical dofs, and from 5s to 15s on the horizontal dofs, there were no more saturations of the GS13s during the Turn ON process of HEPI. The SEI manager was able to entirely bring the HEPI, Stage 1 and Stage 2 under full control, including a restore of 300uRad of HEPI  pitch offset.

 

9:29 -> We request the manager to bring the entire chamber from "everything OFF" to "Fully Isolated"

9:31 -> HEPI is fully isolated. The Yaw and Pitch alignments have been restored. The Manager code waits for the T240s to settle

9:39 -> The T240 monitor indicates to the Manager that the T240 have settled. The manager starts isolating Stage 1. The SEI front end code automatically resets the T240 Saturation counter and the WD starts watching the T240s.

9:41-> Stage 1 and Stage 2 are fully isolated. The Yaw offesets have been restored. The SEI system is "Fully Isolated"

 

We tried this full cycle another time and it worked just as well.

 

A few notes:

- we need to fix the HEPI boost filters

- we tried to Auto Z the T240s after restoring the HEPI offset. It looks like it could save a couple on minutes in waiting time if needed

- the GS13 trip at the very end of de-isolation process. That's no big deal as we almost never need to fully de-isolate for now, but we should have a look into it.

- there is probably some room to reduce some ramping and waiting time here and there, but more than half of the turn on process will still be dedicated to waiting for the T240s to settle

- in the future, we can think of turning on the ISI  in high blend mode while the T240 settle, and then switch to low blend. For that, we'll need the additional guardian node that we talked about to switch the blends and other control parameters.

- it could be nice to add a clock on the T240 monitor screen showing how much time there is still to wait

 

 

 

 

 

 

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