Effects of separation and depth of a pair of parallel plate on the hollow cathode effect.

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  • 2平行平板型ホロー陰極効果への電極間隔と深さの効果
  • 2 ヘイコウ ヘイバンガタ ホロー インキョク コウカ エ ノ デンキョク カンカク ト フカサ ノ コウカ

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Abstract

Constructual study of a pair of parallel plate has been carried out for generating an enhanced hollow cathode effect. Unique feature of the hollow cathode discharge is the result that a fraction of electrons released from the cavity surface can undergo a limited number of ionization, reverse direction and repeatedly across the glow region. This possibility of making multiple passage across the two dark spaces and a glow region depends on the relative size of the separation of the two-parallel plates to the sum of the thickness of the two cathode dark spaces. Consequently, this research is to determine experimentally the optimum separation for obtaining the enhanced hollow-cathode-effect and also to discuss effect of depth of the hollow space. Three gases (Ar, Ne, and N2 ) and three materials (Ni, C, and Al ) combinations which are commonly used for H.C.D. are examined. The optimal separations (p•dm) determined by this experiment range from 0.8 to 1.2[cm•Torr] depending on gas species and materials studied independent of the operating pressure. The minimum depth to obtain H.C.E. is also determined as about 2.5 times of the cathode separation irrespective of the gas and materials studied. Therefore, over depth deeper than 2.5 can sustain the enhanced H.C.E..

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