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Entry  Fri Sep 22 18:38:15 2017, awade, DailyProgress, Vacuum, Baking bake chamber 2017-09-22_18.16.42.jpg
    Reply  Thu Sep 28 21:15:12 2017, awade, DailyProgress, Vacuum, Cleaning refcav Au coated heat shields 13x
       Reply  Fri Sep 29 20:06:21 2017, awade, DailyProgress, Vacuum, Cleaning refcav Au coated heat shields 2017-09-29_19.36.57.jpg2017-09-29_19.33.34.jpg
          Reply  Sat Sep 30 17:09:03 2017, awade, DailyProgress, Vacuum, Cleaning refcav Au coated heat shields 
Message ID: 1937     Entry time: Sat Sep 30 17:09:03 2017     In reply to: 1935
Author: awade 
Type: DailyProgress 
Category: Vacuum 
Subject: Cleaning refcav Au coated heat shields 

Refcav heat shield tubes removed from vacuum can.  End caps were placed into baking rig, heat was turned on after pumpdown at Sat Sep 30 16:25 2017.

For reference variostat was set to 40% of 110V, which seemed to be about right for 100 C yesterday.

Quote:

Parts are now cleaned and ready to bake.  I've put them in a UHV foil lined box with a TX1010 wipe in the bottom to stop scratching. Its a very small vacuum can so I'm baking the two tubes first and will do the end caps and misc parts in the next cycle.  I started a bake cycle at 7:45 pm for just the shields and will let it go for a few hours at 100 C.

This time I wrapped the vacuum can initially in copper foil, then the heater strap followed by a generous amount of food grade aluminum foil.  Its heating up much faster in this configuration.  I wasn't sure how the cloth wipes would fair under baking so the shields were very gently placed directly on an aluminum lining inside the can.  

Pictures attached. 

 

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