asymmetric_implosion wrote: It seems like a daunting problem considering the plasma interacting with the first wall of the onion leading to eddy currents and other electrical noise that will screw up the collection of photo electrons.
I was assuming it was outside the vacuum chamber. OK the chamber wall itself will absorb most of the softer xrays, so a final one would want the minimum obstruction before it. However, for the harder (10-200keV) xrays, you could test the concept.
useful tables and graphs of X-ray absorption can be found at
http://www.nist.gov/pml/data/xraycoef/index.cfm
