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