Hopefully it's burried in a very secure section of the E-Ring at the Pentagon.
while the theory is plausible, the actual data (proof) isn't there, especially in space.
I for one am kind of glad that the data isn't there. It doesn't require a Werner VonBraun to put a crude version of one of these things together. The Chinese have plenty of resources to study and develope this without having to swipe a hard drive or file cabinet at the Department of Energy. The size of the device could be increased or several smaller units could be launched simultaneously to cover a larger area(Thank you Loral and Bill Clinton for helping them out with our MIRV technology). While you say that there is no proof that it will work in space, there is also no proof that it won't. Given the resources that China has at it's disposal, I don't think that it's too much of a streatch for them to scale up the design or increase the yeild. Keep in mind that the Chinese military puts a great deal of emphasis on asymetric warfare. EMP weapons can level a playing field in a big hurry when fighting an adversary that is dependant on electronics. Really this could be done a lot more efficiently by setting a nuke in space above the U.S., but I don't think that they want to get into a nuclear pissing contest with us yet.