Reply To: NIMBY FUD

[asymmetric_implosion]

DHS was interested in a compact neutron source at high repetition rate. The larger machines are not of interest to them for their applications. Others have proposed it and it never worked out. Too many neutrons per shot at high current leading to detectors getting swamped in neutrons and can’t see the signal. DHS has moved onto advancing technology that can impact their mission in the short term. Long term, active interrogation scheme development is on hold unless you are a university and then they want very different technology like exotic particles or out there detection schemes.

As far as the transformer goes, it requires some thought to scale up. When the transformer PF was designed, the thought was to build a 300 kA system as the next step for another group. The transformer has some nice properties but the mass and need for oil are downsides. Eric contacted me about using the transformer system for his PF or next gen PF. It is possible but I haven’t looked at it in the necessary detail. Modeling the transformer PF is a bit more complicated due to the transformers and the approach to transformer core saturation. I don’t think the cores in the RSI paper are saturating but there is some evidence that the transformer geometry is affecting the pinch behavior. There is another paper in IEEE Trans plasma sci on the device (Bures Plasma Focus Neutron Generator, 2012). Another paper is in the works dealing with 10 Hz operation and materials. It have the first round of comments on the paper. I am in the process of rebutting them and making corrections. A paper looking at scaling which includes the RSI transformer PF (internally called AASC PF-2) and FoFu-1 is due out in Physics of Plasmas in Dec 2012. I posted the keys graphs about the scaling law in the generator testing thread about a week or so ago.

I’ve said before that our machines are similar to LPP and John Thompson is the reason. John and I worked together for two years. One of the things he taught me was high current pulse power design. John consulted for our group and LPP for a while before he joined another company.

-BB