40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Sat Nov 6 07:26:54 2010, yuta, Summary, IOO, reduced common mode displacement of the beam through MC1 to MC3 A2LMCalign.png
    Reply  Tue Nov 9 05:40:12 2010, yuta, Summary, IOO, MC aligning going on MCalignNov9.png
       Reply  Wed Nov 10 02:51:35 2010, yuta, Summary, IOO, limitation of current MC aligning MCalignNov9.png
          Reply  Wed Nov 10 11:46:19 2010, Koji, Summary, IOO, limitation of current MC aligning 
             Reply  Wed Nov 10 12:21:18 2010, yuta, Summary, IOO, limitation of current MC aligning 
                Reply  Wed Nov 10 14:28:33 2010, Koji, Summary, IOO, limitation of current MC aligning 
Message ID: 3885     Entry time: Wed Nov 10 11:46:19 2010     In reply to: 3884     Reply to this: 3886
Author: Koji 
Type: Summary 
Category: IOO 
Subject: limitation of current MC aligning 

It didn't make sense in several points.

1. Is the Faraday aperture really 3mm? The beam has the gaussian radius of ~1.5mm. How can it be possible to go through the 3mm aperture?

2. Why the MC3-FT distance is the matter? We have the steering mirror after MC3. So we can hit the center of the Faraday.
But if we have VERTICAL TILT of the beam, we can not hit the center of the Faraday entrance and exit at the same time.
That would yield the requirement.

3. If each coil has 5% variance in the response, variance of the nodal point (measured in % of the coil imbalance) by those four coils will be somewhat better than 5%, isn't it?

ELOG V3.1.3-