{TAIL ~ The invented Hall current ion source} with {HEAD ~ a hybrid positioning} of a central magnetic pole of a bout a half a distance between a gas distributing system and an external magnetic pole and with a high positive gradient of magnetic field helps to improve also electromagnetic focusing of plasma flow inside a discharge chamber from discharge chamber walls into a median part of a discharge chamber 
{ TAIL ~ The invented Hall current ion source } with { HEAD ~ a hybrid positioning } of a central magnetic pole of a bout a half a distance between a gas distributing system and an external magnetic pole and with a high positive gradient of magnetic field helps to improve also electromagnetic focusing of plasma flow inside a discharge chamber from discharge chamber walls into a median part of a discharge chamber
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