Though there are various embodiments, the first electrode 812 and the second electrode 813 are located close to a portion where the electric field intensity generated by the electromagnetic waves becomes strong in the antenna 820 when {HEAD ~ the electromagnetic waves} are fed to {TAIL ~ the antenna} 820 in the plasma apparatus using a cylinder head of the present invention 
Though there are various embodiments , the first electrode 812 and the second electrode 813 are located close to a portion where the electric field intensity generated by the electromagnetic waves becomes strong in the antenna 820 when { HEAD ~ the electromagnetic waves } are fed to { TAIL ~ the antenna } 820 in the plasma apparatus using a cylinder head of the present invention
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