Some notes on aligning the laser through the beam transport.
- Find reference numbers in e-log: search 'alignment' and find a table with pixel coordinates, cameras, motors etc.
It looks like this:
Note the coordinates are for NEGATIVE, NEGATIVE which indicates the direction of the axes.
- Go to facethome → Matlab GUIs → Profile Monitors and then the respective camera (HeNeNear etc.).
- One can check the axis orientation by printing the log book.
- Tick the box for 'Show Stats'. A separate smaller window should open which fits an ellipse to the beam.
If the fit doesn't succeed, it might be necessary to change the exposure.
If the image is saturated, it might be necessary to set the camera to 16 bit (go to camera Advanced → AD Base) - Now find the pico motors: Go to Laser → S20 → Infrastructure.
- Before using the pico motors, check if they are still working by clicking on MAINT → Check Motors
If motors are dead, go to ACSW (first) and turn on and off again - When motors come back, check the current and request value are the same
- When using arrows on picomotors, need to press enter when changing step size
- Note that the profile monitors indicate the beam position behind that particular mirror, e.g. behind B0. To change the beam position, one has to move the mirror BEFORE that mirror, e.g. Launch mirror for B0, B0 for B1 and so on.