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