title: Dynamical changes of ion current distribution for a Penning discharge source using a Langmuir probe array.
abstract: A paralleled plate electrode and a 9-tip Langmuir probe array located 1 mm behind the extraction exit of a cold cathode Penning ion source are employed to measure the total current and the dynamical changes of the ion current in the 2D profile, respectively. Operation of the ion source by 500 V DC power supply, the paralleled plate electrode and the Langmuir probe array are driven by a bias voltage ranging from -200 V to 200 V. The dependence of the total current and the dynamical changes of the ion current in the 2D profile are presented at the different bias voltage. The experimental results show that the distribution of ion current is axial symmetry and approximate a unimodal distribution.
authors.affiliation: Institute of Electric Engineering, China Academy of Engineering Physics, P.O. Box 919-518, Mianyang 621900, China. lim999@foxmail.com
authors.forename: M
authors.initials: M
authors.lastname: Li
authors.forename: W
authors.initials: W
authors.lastname: Xiang
authors.forename: K X
authors.initials: KX
authors.lastname: Xiao
authors.forename: L
authors.initials: L
authors.lastname: Chen