a magnetic field that mainly radial in area around gas distributing system, over anode and having a minimum value in anode area; a radial magnetic field is increasing its value along a central magnetic pole in a form of a protrusion till end of a protrusion, and from this protrusion to a discharge channel end side having {HEAD ~ both components} of {TAIL ~ magnetic field}, radial and axial in area over a central magnetic pole to a discharge channel exit 
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a magnetic field that mainly radial in area around gas distributing system , over anode and having a minimum value in anode area ; a radial magnetic field is increasing its value along a central magnetic pole in a form of a protrusion till end of a protrusion , and from this protrusion to a discharge channel end side having { HEAD ~ both components } of { TAIL ~ magnetic field } , radial and axial in area over a central magnetic pole to a discharge channel exit
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