The cathodic arc source of {TAIL ~ the CAVAD system} is located at {HEAD ~ one end} of the magnetic duct 
The cathodic arc source of { TAIL ~ the CAVAD system } is located at { HEAD ~ one end } of the magnetic duct
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH