an anode with positive electric potential; {HEAD ~ anode} is located close to {TAIL ~ a gas distributing system}, and it is placed in a discharge channel external wall between two cylindrical external dielectric walls 
is located close to
an anode with positive electric potential ; { HEAD ~ anode } is located close to { TAIL ~ a gas distributing system } , and it is placed in a discharge channel external wall between two cylindrical external dielectric walls
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH