My original idea wasn't to seed them with a current, though I hadn't realized liquid based ones had already been made until yesterday when I saw the links at the bottom of this response. Van de Graaff's original patent actually had a similar mechanism to what you describe (using a low power battery to polarize the collector and draw the electrons out of the moving fluid using a pair of capacitive plates that form the collector (with a slight bias from the battery to drive them towards the collecting sphere). A more recent paper (of which I've found no additional details aside from the first link below) details a design that is pretty close to lossless (the biased version I originally attempted was very lossy, so this is an attempt to actually get into the required MV power levels) - the seed power source is to power the injector of the almost-lossless version:
On Monday, March 12, 2012 8:57:02 PM UTC-4, Simon Field wrote:
Since you are just using the high voltage to seed the VDG, do you reallyneed a lot of current? I build normal VDGs (non-liquid), and the losses aresmall, and while I generally don't need to seed them with extra HV, whenI have done so, a nine-volt battery into a negative ion generator worked fine.
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