Some of {HEAD ~ 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 {TAIL ~ the solid source material} 
Some of { HEAD ~ 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 { TAIL ~ the solid source material }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL