Thermionic emission and a novel electron collector in a liquid helium environment

被引：16

作者：

Fang, J. ^{[1
]}

Dementyev, Anatoly E. ^{[1
]}

Tempere, Jacques ^{[1
,2
]}

Silvera, Isaac F. ^{[1
]}

机构：

[1] Harvard Univ, Lyman Lab Phys, Cambridge, MA 02138 USA

[2] Univ Antwerp, TFVS, B-2020 Antwerp, Belgium

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2009年 / 80卷 / 04期

关键词：

helium films; insulating thin films; liquid films; liquid helium; superfluidity; thermionic electron emission; MULTIELECTRON BUBBLES; LOW-TEMPERATURE; HOT FILAMENT; TRANSITION; SURFACE; INJECTION; FILMS;

D O I：

10.1063/1.3103944

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We study two techniques to create electrons in a liquid helium environment. One is thermionic emission of tungsten filaments in a low temperature cell in the vapor phase with a superfluid helium film covering all surfaces; the other is operating a glowing filament immersed in bulk liquid helium. We present both the steady state and rapid sweep I-V curves and the electron current yield. These curves, having a negative dynamic resistance region, differ remarkably from those of a vacuum tube filament. A novel low temperature vapor-phase electron collector for which the insulating helium film on the collector surface can be removed is used to measure emission current. We also discuss our achievement of producing multielectron bubbles in liquid helium by a new method.

引用

页数：8

共 29 条

[1] MULTIELECTRON BUBBLES IN LIQUID-HELIUM [J].