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New toy arrived at work (Update: Now with Double.PositiveInfinity% more videos)

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Mark R said:
Heh. 400 MHz would be nice. I guess one of the compromises of having a 750 mm bore, is having a lower field strength/frequency - 133 MHz in this case.

Most big MRI scanners don't use LN2. The early ones did, but this was rapidly dropped, presumably for reasons of complexity. Helium reliquification equipment is standard on all new MRI scanners, which makes helium top-up an unusual maintenance activity. Without the reliquification system operational, boil off rates are typically between 200-400 ml/day, depending on field strength - higher fields tend to boil off faster.

1762 l is a lot of helium. I'm told that restarting the magnet after an emergency quench is expected to cost about $50k.
Click to expand...

Yup it only had a 54 mm bore 🙂

The latest NMR tech which also uses 2K cooling allows 1000 MHz.

Magnetic field strength 23.5 Tesla
NMR proton frequency 1000 MHz
Standard bore size 54 mm
2 K UltraStabilized™ sub-cooling technology
 
Got an update.

Thing is connected up and making all the right noises, but the main room was locked up so I couldn't get in. Schedule is another 2 weeks before it is ready for testing.

Here's a quick look at the magnet cooling system. You can hear the water pumps whirring, and the refrigeration compressor tweeting in the background.

Video of chiller cabinet
 
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