Evolution of the electric potential of an insulator under charged particle impact

被引：17

作者：

Giglio, E. ^{[1
]}

Guillous, S. ^{[1
]}

Cassimi, A. ^{[1
]}

Zhang, H. Q. ^{[2
]}

Nagy, G. U. L. ^{[3
]}

Tokesi, K. ^{[3
,4
]}

机构：

[1] Ctr Rech Ions Mat & Photon CIMAP, F-14000 Caen, France

[2] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou, Peoples R China

[3] Hungarian Acad Sci ATOMKI, Inst Nucl Res, POB 51, H-4026 Debrecen, Hungary

[4] ELI HU Nonprofit Ltd, ELI ALPS, Dugon Ter 13, H-6720 Szeged, Hungary

来源：

PHYSICAL REVIEW A | 2017年 / 95卷 / 03期

基金：

匈牙利科学研究基金会; 中国国家自然科学基金;

关键词：

PROTON MICROBEAM; TRANSMISSION; CAPILLARIES;

D O I：

10.1103/PhysRevA.95.030702

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Insulating glass capillaries have been shown to lead to ion transmission without any change in either the ion charge state or in the ion kinetic energy. This surprising process has been attributed to a self-organized distribution of charge patches creating the necessary guiding electric potential on the capillary walls. By the use of our original electrometer, it has been possible to measure and monitor simultaneously and in a nondestructive way the electric potential and the transmitted beam intensity during the charging up by an Ar+ ion beam. We show that glass microcapillaries can reach potentials higher than 500 V, even in the case of singly charged ions, opening the possibility of high transmission rates and providing a renewed sight into ion beam transport by tapered capillaries. The setup, also suitable for the determination of leakage currents governing the capillary potential dynamics, allowed one to evidence that secondary electrons may strongly affect the rise of the capillary potential and consequently avoid Coulomb blocking of the beam transmission across insulating capillaries.

引用

页数：5

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