There are four beams from the LPL that exit the laser bench towards the target chamber. Two of the four beams are colinear with each other, making an East beam and a West beam. The West beam is a colinear combination of amplifier legs AB and EF and the East beam is a colinear combination of amplifier legs GH and IJ. Both West and East beams have a "fixed" beam and an "adjustable" beam within the respective West and East beams. The "fixed" beam in each arm has a user adjustment only in the form of a periscope mirror that is located after the final beam expanding telescope. The "adjustable" beam in each arm has a user adjustment in the form of an EPICS controlled mirror mount adjustment. Below are the steps required for optimally aligning all four beams.
- Assuming that all beams are optimally aligned in the final sets of iris's for both East and West beams, enter Python command meclas.TTL_shutter.Toggle('closeABEF'). This will allow only the "fixed beam from the West and East arms to be available for transport into the TC.
- If necessary, adjust the top periscope mount(s) shown to better direct the beam to the desired location in the TC. Do not adjust any other mirror on the laser table for this step
- Enter Python command meclas.TTL_shutter.Toggle('openABEF'). This will allow the two colinear East and West beams to be transported into the TC.
- On MEC Home, open Newport PS_4. The vertical and horizontal adjustments for each of the two "adjustable" beams can be made if necessary, to precisely align the colinear beam in each arm.
