We started a vacuum work in this morning. And still it's going on.
Although the last night the green team replaced a steering mirror by an 80% reflector on the PLS table, the beam axis to the MC looks fine.
The MC refl beam successfully goes into the MCrefl PD, and we can see the MC flashing as usual.
We started measuring the distance of the optics inside the vacuum chamber, found the distance from MC3 to MMT1(curved mirror) is ~13cm shorter than the design.
We moved the positions of the flat mirror after the Faraday and the MMT1, but could not track the beam very well because we did not completely lock the MC.
Now we are trying to get the lock of the MC by steering the MC mirrors.
I just finished redoing the calc based on the measurements that happened last week. Using the average of the Vert and Horz measurements in Kevin's elog 2986, I find that we need to make the MMT telescope ~8cm longer. So, can you please place the flat mirror after the Faraday in the same place as the drawing, but move the MMT1 79mm farther away from that flat mirror? Looking at the table layouts that Koji has on the wiki, this should still (barely) fit.
d2a = 884.0mm (no change) ------ MC3 to Flat after Faraday
d2b = 1123.2mm (move MMT1 farther toward center of BS table) -------- Flat after Faraday (SM1) to MMT1
d3 = 1955.0mm (result of moving MMT1) --------- MMT1 to MMT2
d4a = 1007.9mm (no chnage) ----------- MMT2 to SM2
d4b = 495.6mm (no change) ------------ SM2 to PRM