WP #5710
I have added two functions in the PSL ISS front end model. Both are related to the second loop and not to the first loop. The model has been compiled, installed and restarted. The changes I made are:
- Trigger logic for engaging the second loop
- A servo to achieve "software AC coupling" in the second loop.
I have not yet tested these functions. Since the changes are additive to the existing model, one can still use the guardian to engage the second loop.
The attached is a half-baked and inaccurate medm which shows the new functions. Even though it is inaccurate, it is conceptually good enough to show what I implemented.
The trigger logic is shown in the right hand side of the screen. It watches the amount of the signal (i.e. SECONDLOOP_SIGNAL) which would go to the inner loop and triggers the second loop when it meets the trigger setting.
The software AC coupling function is show in the left of the screen. When one wants to keep using the manual silder to adjust the offset, one can fill the first row of the matrix which plugs the slider value to the offset point. When one wants a slow servo as the guardian has been doing, one can plug three different error signals and correct the offset point depending on the engagement steps.
Currently, Masayuki is editing the screen.