Negative ion extraction from hydrogen plasma bulk

作者：Oudini N^*; Taccogna F; Minelli P; Aanesland A; Raimbault J L

来源：Physics of Plasmas, 2013, 20(10): 103506.

DOI：10.1063/1.4825246

A two-dimensional particle-in-cell/Monte Carlo collision model has been developed and used to study low electronegative magnetized hydrogen plasma. A configuration characterized by four electrodes is used: the left electrode is biased at V-l = 100 V, the right electrode is grounded, while the upper and lower transversal electrodes are biased at an intermediate voltage V-ud between 0 and -100 V. A constant and homogeneous magnetic field is applied parallel to the lateral (left/right) electrodes. It is shown that in the magnetized case, the bulk plasma potential is close to the transversal electrodes bias inducing then a reversed sheath in front of the right electrode. The potential drop within the reversed sheath is controlled by the transversal electrodes bias allowing extraction of negative ions with a significant reduction of co-extracted electron current. Furthermore, introducing plasma electrodes, between the transversal electrodes and the right electrode, biased with a voltage just above the plasma bulk potential, increases the negative ion extracted current and decreases significantly the co-extracted electron current. The physical mechanism on basis of this phenomenon has been discussed.

• 出版日期2013-10