I am obviously very uninformed about this, but in the picture I'm referring to [0] you can see the walls in pretty good detail, so I assumed it was an optical p

I am obviously very uninformed about this, but in the picture I'm referring to [0] you can see the walls in pretty good detail, so I assumed it was an optical picture. No idea if a neutron flux picture would provide these details or not. [0] https://www.ipp.mpg.de/4550362/original-1543230147.jpg?t=eyJ3aWR0aCI6MTQwMCwib2JqX2lkIjo0NTUwMzYyfQ==--725ae5efe9c24f625450fa8f0143a53cb5d8a7dc https://www.ipp.mpg.de/4550362/original-1543230147.jpg?t=eyJ...