The ICCD Camera gives results that don’t show the plasmoid too well.
Maybe it is worth adding one or two UV lenses for magnification.
I found something at:
http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productid=2886
The transmittance starts to drop at 200nm and it is opaque at 160nm.
Maybe there are other manufactures with better lenses.