it isn't a yield (like shock/heat wave, etc...) that is the primary purpose of neutron weapons. The neutron flux is what they are created for. Just for example - the neutron weapons deployed in Europe several decades ago were of very low yield, as low as it is possible with fissile-fusion weapon - their purpose was to stop Soviet Union tanks as intense neutron flux passes easily through the armor, yet is absorbed nicely by humans as we're 80% water.

>I have a hard time believing that a fusion power source would work at all like a fusion bomb.

No need to. The only thing what matters is the amount of neutrons generated. High intensity flux during 10-30sec. instead of super-high during 0.001ms explosion would do the same damage if the total amount of neutrons generated is the same.

I mentioned Sandia because what they do (more precisely what they did 10 years ago) was the most effective and promising way to get effective fusion - for energy generation as well as to weaponize it without fission part, and i think it is illustrative to look at them to see how progress has stalled (more precisely it was redirected from advancing of the engineering of the fusion into more plasma research) when it became that clear.