Hull breach! Shields at 0%!

One layer down, five to go.

Well much to my delight and contrary to expectation, the excellent fellow charged with the exciting task of peeling this particular onion has managed to cleanly extract a segment of the outer casing in only 3 hours!  Huzzah!  

 
All of that tin foil (aluminised Mylar, actually) is only serving to solidify this very Chrismassy feeling.  

BoPET (Biaxially-oriented polyethylene terephthalate)
by Rohieb - own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1740011

  

Mylar is also used in emergency blankets to treat shock.

Mylar, or biaxially-oriented polyethylene terephthalate, is a polyester film that when metallised by vapor deposition of aluminium reflects infrared radiation from the inside of the outer can (remember only ca. 3mm of stainless steel separates this space from the magnet's room-temperature environment, and the next layer in is the liquid nitrogen reservoir). 
Prior to the quench, the space that this super-insulation fills was under vacuum.

Cheeky selfie!

Next up on the cutting agenda: 
the liquid nitrogen vessel.