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