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Entry  Mon Jan 28 19:15:14 2013, Manasa, Update, Scattering, Scattering setup 
    Reply  Wed Jan 30 11:18:31 2013, Manasa, Update, Scattering, Scattering setup 
       Reply  Thu Jan 31 11:53:31 2013, Manasa, Update, Scattering, Scattering setup 
          Reply  Tue Feb 12 23:22:14 2013, Manasa, Update, Scattering, Scattering setup 
Message ID: 7962     Entry time: Wed Jan 30 11:18:31 2013     In reply to: 7948     Reply to this: 7971
Author: Manasa 
Type: Update 
Category: Scattering 
Subject: Scattering setup 

Quote:

 [Jan, Manasa]

We are trying to get some scattering measurements in the Y-arm cavity. We have removed one of  the viewport windows window covers of ETMY chamber and have installed cameras on a ring that clamps to the window. The window along with the ring attachment is covered with aluminium foil when not in use.

[Jan, Manasa]

To align the camera to see small angle scattering from the ITMY, we tried shooting a green laser pointer at the pickoff mirror that was installed in the ETMY chamber such that we hit the face of ITMY. But we concluded that to be a very bad way to align the camera because we have no means to reconfirm that the camera was exactly looking at the scattering from ITMY.

Since we are in air, we came up with a plan B. The plan is to temporarily install a mirror in the ITMY chamber to steer the beam from the laser pointer (installed on the POY table) through ITMY to the pickoff mirror at the ETMY end. This way, we can install the camera at the ETMY window and be sure we are looking at ITMY scattered light. 

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