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Entry  Fri May 28 21:32:32 2010, Alberto, Update, 40m Upgrading, MC alignment 
    Reply  Fri May 28 23:21:52 2010, Koji, Update, IOO, MC alignment 
       Reply  Mon May 31 00:10:18 2010, kiwamu, Update, IOO, MC alignment 
          Reply  Mon May 31 03:38:48 2010, Koji, Update, IOO, MC alignment MC_spot_centering.png
             Reply  Mon May 31 17:47:34 2010, kiwamu, Update, IOO, today's plan : MC alignment 
Message ID: 3013     Entry time: Fri May 28 23:21:52 2010     In reply to: 3012     Reply to this: 3019
Author: Koji 
Type: Update 
Category: IOO 
Subject: MC alignment 

Hm... You touched the optics between the MC and the Faraday... This will lead us to the painful work.

I am afraid that the beam is already walking off from the center of MC1/MC3 after the work on the PSL table.
This may result in the shift of the spot on those MC mirrors. So I recommend that:

- Lock the cavity
- Check the A2L for MC1/3
- Adjust it by the periscope
- If it is fine, adjust the optics after the MC (steering, Faraday, etc)

Off-centering of the MC2 spot is no problem. We can move it easily using Zach's scripts.
Tell me when the work is planed on Sunday as I might be able to join the work if it is in the evening.


[Alberto, Kiwamu, Kevin, Rana]

Today we tried to measured the beam shape after the MC MMT1 that Jenne installed on the BS table.

The beam scan showed a clipped spot. We tracked it down to the Farady and the MCT pickoff mirror.

The beam was getting clipped at the exit of the Faraday. But it was also clipping the edge of the MCT pick-off mirror. I moved the mirror.

Also the beam looked off-center on MC2.

We're coming back on Sunday to keep working on this.

Now things are bad.


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