Individual and center-of-mass resonances in the motional spectrum of an electron cloud in a Penning trap

被引：11

作者：

Paasche, P ^{[1
]}

Valenzuela, T ^{[1
]}

Biswas, D ^{[1
]}

Angelescu, C ^{[1
]}

Werth, G ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

来源：

EUROPEAN PHYSICAL JOURNAL D | 2002年 / 18卷 / 03期

关键词：

D O I：

10.1140/epjd/e20020033

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have examined experimentally the motional spectrum of an electron cloud confined in a Penning trap. When the axial oscillation is excited by a radio frequency field the resonance exhibits a double structure. Both components depend differently on the number of trapped electrons and have different shape and width. We conclude that one of them corresponds to the excitation of the individual electrons while the other is the center-of-mass mode of the cloud. The threshold behaviour of the center-of-mass resonance suggests that it is a parametric instability of a Mathieu type equation of motion.

引用

页码：295 / 300

页数：6

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