It is sufficient to have a very small cyclotron that weighs 12 tons, to accelerate helium nuclei that automatically collide against a beryllium target.
The piece of beryllium emits neutrons that can be used to make nuclear transmutations and therefore also to make LENR in an efficient and exciting way.
Therefore the cyclotron must be loaded with rarefied helium gas.
The neutron flux intensity is proportional to the density of helium gas.
Warning ! Have not to want too dense a flow of neutrons because then you would need a electric central to feed that small cyclotron.
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The televisions make believe that beryllium is a very dangerous material and if you touch it you die instantly struck, in reality with the beryllium you could also make the cans of the cocacola