2011Sep run

Sep. 1st

I realigned MIRC and photometric channels, and squeezed fibers.

The MIRC light coming out of lens array missed the spherical mirror, they were hitting about 7mm lower than they were supposed to hit. So the bottom beams totally missed the spherical mirror. I corrected it by moving the MIRC lens array up about 50microns to make sure that the MIRC light hitting the spherical mirror and the center of the MIRC quadrant on the detector.

Then I found that the MIRC light is hitting

the the left part of the cylindrical lens, which reduce the light in the central row to about 60%. The light after cylindrical lens hit the right part 

of the doublet. I corrected both by rotating spherical mirror, and the light on the central row goes up to 90% again.

Then I aligned photometrical channels, the peak of beam 3 and 4 is about 5 times of mirc light.

Then I find fringes on all the pairs, and here are the images.

The pickoff mirror are the same as in July, check the 2011July log. The new Retro positions:

beam12: 6.6485mm beam23: 6.1085mm beam34: 4.8462mm beam45: 5.8344mm beam56: 5.1697mm

the carts position for beam16 fringe: W2(beam6) - W1(beam1) = 0.222526m

The fringe of beam 34 and 45 are worse, so I adjusted the beam 4 squeezer, here are improved fringes on beam34 and 45.