thoughts on the road may first

20 kilowatts will produce one pound thrust.

The coaster would be Impractical because it wouldn't be powerful enough to get off the ground.

Second idea: what if you can get a muon to work with a polywell?
It would be unconventional to say the least. I figure that you have to be very concise as to the placement of the muons.

Update:

Perhaps if you direct the muons to the plasmoid in the dense plasma focus?  The idea here is to get the muon amidst a lot of positively charged ions where it will remain and do its work to help bring about fusion.  If a lot of muons can help shrink the plasmoid as well as aid in the fusion itself, maybe it could make a difference.

Update:

Here's a pic of a plasmoid that would be the target of the muons.  The goal of the researchers is to shrink down the size of the plasmoid.  Would the muons help to achieve this?

Our smallest plasmoid yet, in formation. The plasmoid is forming at the narrowest “waist” of this image, which is 1 cm across. The waist is only 200 microns in radius. The black specks are defects in the ICCD imaging device

Now, the problem with muon-catalyzed fusion is the sticking of the muons which prevents the maximum number of catalyzed fusions.  The muons are used on frozen hydrogen.  What if the hydrogen is high energy, would this help with the sticking problem?