Xiao's 2011May run

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May 8th

1. find the best focus for luminous 5 and 6 We mount a visible fiber to one stage and shoot visible light in from the other end. Moving z axis manually to make sure the spot bounce off the parabola mirror maintain similar size to a long distance, which means we find rough focus position. Then we search XY position by letting the spot go through an alignment telescope, and look at the spot size and shape on wall. Then we adjust the alignment telescope to infinity by placing a mirror in front of it, and find the two clear grid image. Now we try to adjust z axis of luminous stage manually again to find a finer focus by looking at the spot through the telescope (BE care to reduce light first before looking in to the telescope)

2. re-find focus position for beam 1 AND 2 AND 3 Since we replaced all the actuators on luminous stages with new ones, we have to find the focus positions for all the stages. For beam 1, 2 and 3, because they still use the same infrared fibers, the fiber should stay at the best focus positions as before, which means you don't need to adjust the pickoff mirror. We shoot laser into the MIRC vgroove and align it with CHARA beam on the alignment telescope. First place a beamsplitter in between MIRC light and CHARA beam, and a retro near the beamsplitter: 

                                           mirror  ==>   alignment telescope
                                             /\
                                              ||
              MIRC light = = >   beamsplitter         <= = CHARA beam
                                           ||    /\
                                           \/   ||
                                            retro

Second, place the CHARA beam in the center of telescope by adjusting beamsplitter, retro, and mirror. Third, overlap the CHARA beam with MIRC light by moving XYZ axis through FE gui.

Be care when looking into the telscope, reduce the laser or waring a goggles.

May 9th

1. change the fiber on luminous stage 4

2. mount luminous stages 5 and 6


May 10th

1. assemble new MIRC hardware pieces and get aligned roughly to the camera

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