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Entry  Mon May 24 15:47:30 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling cooling.png
    Reply  Mon May 24 16:49:17 2021, rana, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling PPP.jpg
       Reply  Tue May 25 13:19:41 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling 
    Reply  Tue May 25 16:38:17 2021, Stephen, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling --> started warmup cooling_full_20210525.png
       Reply  Thu May 27 16:48:35 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling --> started warmup 7x
          Reply  Mon May 31 11:38:13 2021, Radhika, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling 14x
             Reply  Wed Jun 2 20:06:07 2021, rana, DailyProgress, Cryo vacuum chamber, Weekend cryo chamber cooling 
Message ID: 2576     Entry time: Tue May 25 13:19:41 2021     In reply to: 2575
Author: Radhika 
Type: DailyProgress 
Category: Cryo vacuum chamber 
Subject: Weekend cryo chamber cooling 

[Radhika, Stephen]

Instant gratification McMaster sourcing (PO S519341, submitted earlier today)

  1. metallized PET film (off-brand Mylar) in two thicknesses
  2. PEEK sheet in a few thicknesses
  3. G10 tube with ODs matching various apertures.

Should be able to integrate some of these items soon - they arrive Thursday, and Radhika will check to see if anything works for the setup as-is, or make requests for Stephen to cut on Friday.

future Mylar source - https://www.professionalplastics.com/MYLARFILM

     - update: Radhika called Professional Plastics and they said we cannot order metallized mylar online, but we can call them back and place the order. Stephen called later and Sarah said she had to get a quote from a supplier, and will be in contact. Thickness range: 0.001-0.014 in.

future PEEK source - https://www.professionalplastics.com/PEEK_SHEET-ROD-BAR: thickness range: 0.25-2 in. (units not specified, but I assume inches).

future PEEK source - https://www.boedeker.com/Product/PEEK-Virgin-Natural: thickness range: 0.062-4 in.

uote:

exp plot tip: If you use the "grid" feature of matplotlib and plt.semilogy(), the exponentials will look like straight lines, so we can just read off the time constants with a ruler.cool


Also, as we talked about earlier today, we should make some analytical estimates for the various heat loads, and also put them into the model.

For protecting from radiation, all of the surfaces which are NOT shiny-polished should get wrapped in something shiny (UHV Al foil, with the shiny side out).

I suggest wrapping with foil:

  1. Baseplate (to keep it from radiating into the cold plate (the tapped work surface))
  2. Copper strap (after first wrapping it with a sheet of Mylar to block conduction to the foil). Al foil should be wrapped with shiny side out.
  3. Plastic spacers. wrap around the length, but not the ends.
  4. Holes in the shields where the thermal strap enters. Edge the holes with a G-10 ring/grommet to prevent touching the straps.

I attach here a photo of the radiative shielding of a Purple Pepper Plant (PPP), to reduce the radiative coupling to the environment. This prevents the soil from drying out in the sun so fast.

 

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