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Entry  Wed Oct 20 11:31:06 2021, shruti, Update, PSOMA, Towards locking PSOMA with cantilever 
    Reply  Tue Oct 26 10:01:54 2021, shruti, Update, PSOMA, Towards locking PSOMA with cantilever TiltedCantilever.pdfcantileversurface.pdfclampsurface.pdf
       Reply  Thu Nov 18 11:09:24 2021, shruti, Update, PSOMA, Towards locking PSOMA with cantilever CavitySetup.pdfGeometry01.jpeg
          Reply  Wed Dec 1 13:21:54 2021, shruti, Update, PSOMA, Towards locking PSOMA with cantilever IMG_1250.pngIMG_1252.pngIMG_1251.pngIMG_1253.pngIMG_1254.png
             Reply  Thu Dec 2 13:40:57 2021, shruti, Update, PSOMA, Progress and cavity parameters/ lock parameters 
Message ID: 2825     Entry time: Tue Oct 26 10:01:54 2021     In reply to: 2824     Reply to this: 2828
Author: shruti 
Type: Update 
Category: PSOMA 
Subject: Towards locking PSOMA with cantilever 

26 Oct 21, Tue

Yesterday while the power was out I turned off laser drivers and other powered electronics that I could think of. When the power was back I rebooted the computers (checked that I was able to ssh into cymac) and the electronics that I had turned off. I noted that the cavity was back on resonance as indicated by the forest of peaks that we were seeing.

Today when I returned to the lab the forest was missing and Aaron noticed that the cantilever seemed to be tilted in the clamp. Attachment 1 shows the exact angle at which it was found. A small part at the end is chipped off but it otherwise appears usable to me.

Attachment 1: The cantilever at the angle at which it had tilted to with the chipped bits, after just removing the top piece of the clamp.


Before re-clamping, we (Aaron and I) decided to use a variable torque socket wrench to test for optimal clamping torques on another sacrificial cantilever. I decided to abandon this experiment after Rana pointed out at the group meeting that this would not give any really reliable number for the required clamping torque since breakage torques may have a wide range of random values for different cantilevers.


28 Oct 21, Thu

Attachment 2: Mobile phone image (without external lens) of the cantilever's clamping surface. It shows some pits and scratches, one larger than 100 microns.

For reference, the dimensions of the clamping area are 1cm x 1cm.


Attachment 3: The clamping surface of the smaller (top, while clamping) piece of the clamp, that contains the indentation where the cantilever sits.

Attachment 1: TiltedCantilever.pdf  965 kB  Uploaded Tue Oct 26 11:02:03 2021  | Hide | Hide all
Attachment 2: cantileversurface.pdf  9.355 MB  Uploaded Wed Oct 27 16:23:05 2021  | Hide | Hide all
Attachment 3: clampsurface.pdf  14.219 MB  Uploaded Wed Oct 27 16:23:19 2021  | Hide | Hide all
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