{HEAD ~ Some} of {TAIL ~ the energy} is converted to heat that can be dissipated to a cooling system to avoid crucible melting and contamination diffusion from the crucible to the solid source material 
of
{ HEAD ~ Some } of { TAIL ~ the energy } is converted to heat that can be dissipated to a cooling system to avoid crucible melting and contamination diffusion from the crucible to the solid source material
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH