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Entry  Fri Feb 19 15:17:51 2021, Jordan, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS Neutral_Point.pngDumbell_Max_Negative_Travel.pngDumbell_Max_Positive_Travel.png
    Reply  Fri Feb 19 16:06:01 2021, Koji, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS 
       Reply  Fri Feb 19 16:14:16 2021, gautam, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS 
          Reply  Fri Feb 19 16:55:26 2021, Koji, Update, SUS, CoM Range on 3"->2" Adapter Ring for SOS 
Message ID: 15825     Entry time: Fri Feb 19 16:14:16 2021     In reply to: 15824     Reply to this: 15826
Author: gautam 
Type: Update 
Category: SUS 
Subject: CoM Range on 3"->2" Adapter Ring for SOS 

I briefly talked with Jordan about this. This suspension will have OSEMs right? With 400ohm series resistance for the coil drivers, we will have ~+/-20mrad actuation range. Of course we'd like to use as much of this for interferometry and not static pitch alignment correction (possibly even increase the series resistance to relax the dewhitening requirements). But what is the target adjustability range in mrad with the dumbell/screw config? My target in the linked elog is 500urad (not any systematic optimum, but will allow us to use most of the DAC range for interferometry). Are these numbers in inches commensurate with this 500urad?

On a related note - are there grooves for the wires to sit in on the side of the sleeve? We looked at the solidworks drawing, and noticed that the groove doesn't extend all the way to the top of the clamp. Also, the material of both the clamping piece and the piece onto which the wire is pressed onto is SS. Don't we want them to be Aluminium (or something softer than the wire) so that the wire makes a groove when the clamp is tightened?

Quote:

We want to move the CoM with the adjustment range so that the residual deviation is adjusted by the bottom dumbbell. 0.0003" is well within the range and good enough.

ELOG V3.1.3-