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Entry  Fri Jul 29 14:27:43 2022, Stephen, DailyProgress, Cryo vacuum chamber, Progress - Heaters, RTDs, Maglite 
    Reply  Tue Aug 2 11:37:19 2022, Radhika, DailyProgress, Cryo vacuum chamber, Progress - Heaters, RTDs, Maglite IMG_3704.jpeg
       Reply  Fri Sep 9 12:10:29 2022, Radhika, DailyProgress, Cryo vacuum chamber, Progress - Heaters, RTDs, Maglite IMG_3745.PNG
          Reply  Fri Sep 16 16:29:28 2022, Radhika, DailyProgress, Cryo vacuum chamber, Progress - Heaters, RTDs, Maglite IMG_3756.jpegIMG_3759.jpeg
Message ID: 2798     Entry time: Tue Aug 2 11:37:19 2022     In reply to: 2797     Reply to this: 2801
Author: Radhika 
Type: DailyProgress 
Category: Cryo vacuum chamber 
Subject: Progress - Heaters, RTDs, Maglite 

- RTD calibration with Clare scheduled for Wed 8/3 morning.

- A heater will be bolted down to the cold plate for the next cooldown (to aid in chamber warmup).

- For the maglite, I took the wire intended for ground and wrapped it through the drilled hole and around [Attachment 1]. When I applied solder, it bonded to the wire but made no contact with the Maglite aluminum surface. The near-instant oxidation of the aluminum still prevents the solder from bonding to it. Previously when we tried scratching the surface and immediately using mineral oil (vaseline) to prevent oxidation, the solder joint still did not form due to the layer of oil. So I am not convinced that applying vaseline will help this joint with the drilled hole - I am in favor of considering an alternative connection. In addition, the wrapped wire does not allow the maglite shaft to slide completely into the "head", and thus the bulb does not make it through the opening of the reflector. 

 

Quote:

Update to QIL/2795:

  • RTDs (Digi-key P/N 615-1123-ND) brought to lab (see pic).
  • Heaters (Digi-key P/N A102128-ND) brought to lab (see pic).
  • Maglite hole drilled; remains to be seen whether than improves solderability, but we could also look at a lug / ring connector as an alternative connection.

 

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