INVESTIGATION OF THE EXTRACTED H- CURRENT IN A CONTINUOUSLY PULSED-VOLUME NEGATIVE-ION SOURCE

被引：6

作者：

HEEREN, RMA ^{[1
]}

MELLON, KN ^{[1
]}

HOPKINS, MB ^{[1
]}

CIRIC, D ^{[1
]}

KLEYN, AW ^{[1
]}

机构：

[1] DUBLIN CITY UNIV,DEPT PHYS,DUBLIN 9,IRELAND

来源：

EUROPHYSICS LETTERS | 1992年 / 17卷 / 6BIS期

关键词：

ION SOURCES; POSITIVE NEGATIVE AND POLARIZED; ELEMENTARY PROCESSES IN PLASMA;

D O I：

10.1209/0295-5075/17/6/005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have observed a significant increase in average extracted negative-ion current <I-> when pulsing the discharge current of a small, high-power density volume negative-ion source at low pressures. Compared to a DC-operated discharge, <I-> is increased by 35% at a pressure of 0.38 Pa. This result is explained with a simple model which shows that the enhancement of <I-> at low pressures can be attributed to an increased production of negative ions through dissociative attachment, as a result of the colder electrons in the postdischarge. The temporal behaviour of the extracted negative-ion current in this small, high-power density source is markedly different than the negative-ion current of a larger low-power density source.

引用

页码：503 / 508

页数：6

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