> Whatever I tried, the cylindrical pattern never showed up - instead I 
> got a uniformly white ring! What's my mistake?

You simply underestimated the effect of scale on media. Scaling does 
increase the volume, but leaves the density unaffected, so there's more 
matter to emit / absorb / scatter the light.

Reduce the "emission" value (something like 0.005 should get you 
started), and you should be fine.

But didn't you want to use scattering media anyway?

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