Shiela, Begum, Camilla, Madi E2600157

Morning:

Starting at FC alignment from Friday, 90527.

Tried to make the beam the correct ~5.5” height at ZM2 with A:M1 and then use ZM2 to get correct height at ZM3 (~6.25") but ZM2 did not have enough range. We railed it by only going halfway. Instead, we used A:M3 for beam height at ZM3 and then ZM3 for retroreflected beam. Did this only in PITCH (used YAW offset to help check retro-refection). Took height measurements (~6.25" at FC1 and  ZM3, 5.85") This is not perfect at ZM2 but we'll check for any astigmatism when beam profiling. Attached alignments. 

Tried to use B:M1 and BM4 to realign to ZM4 iris. However, beam could not be near centered on B:L1 aperture and fully transmit SFI2 (was a clipped after SFI2).

Realized beam height wasn’t level after OPO. High at A:L1 and low at A:DC2. We then used A:M1 pitch to center art A:L1 and then SFI1 aperture. And A:M2 to center on A:L2 aperture. We again checked if we could now get the correct height at ZM2 without railing ZM2 to get bean to ZM3, no. So adjusted A:M3 in PIT. After this was done, we realized PIT and YAW must be cross coupled as the beam was yaw'ed towards +X at the ZM3 iris. Paused. 

Afternoon:

Looked again at the beam through A:L2 aperture and Sheila thought it was high. Begum and I then counted turns of the A:M1 and A:M2 mirror knobs before the beam clipped on the SFI1 and A:L2 apertures (checked that's where it was clipping with power meter) and then centered on each aperture. 

Once we were happy with this. We again used A:M3 for beam height at ZM3 and then ZM3 for retroreflected beam. Did this only in PITCH (used YAW offset to help check retro-refection). The beam is still off in yaw at the ZM1 iris. Think this is from our initial  A:M1 and A:M2 PIT moves.

We weren't 100% happy with our height measurements as think the beam was a little low at ZM3 <6.25", ZM2 5.8", FC1 6.25". We also think that the beam isn't centered on ZM2, photo. Another reason to think this is that when we try to move the retrofection to each side of the outgoing beam, it only moves to one side. 

Beam scans:

We then stopped alignments to think about what to do with yaw and took beam profile measurement before and after ZM2 with the Phasics camera and TCS FLIR laptop. Took profiles and three locations between ZM1-ZM2 and two locations ZM2-ZM3. In one of the locations between ZM2-ZM3 we adjusted the ZM2 PSAMS from 3.15V (nominal) to 1.15V (minimum), 6.05V (maximum) and 4.51V (somewhere else in the middle).