Turns out it's quite practical to put crystalline beams into one of Brookhaven National Laboratory's existing #accelerators, if you adjust the magnet settings.  (Paper below to be presented at IPAC'26).
<br /><a href='https://stephenbrooks.org/ap/report/2026-1/WEP4324.pdf
'>https://stephenbrooks.org/ap/report/2026-1/WEP4324.pdf
</a><br />Normally we put "charged plasma", structured like a gas, into accelerators, but this bunch behaves like a slightly-molten liquid.  Solid structure for the most part, but occasionally the ions swap places, maybe like tar or molasses.
<br />Anyway, this is interesting because these near-solid bunches have about a factor 10^5 less velocity spread than typical bunches, in all three axes, so a focal point should be 10^15 (one quadrillion) times denser.  That's why I was talking about synthesising nuclear density matter (neutronium) earlier.
<br />#physics