ISSN:0021-8979    

DOI:10.1063/1.1707371

出版商:AIP    

年代:1944

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1707372

出版商:AIP    

年代:1944

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1707373

出版商:AIP    

年代:1944

数据来源: AIP

摘要:

A new type of vacuum tube is described in which a flat radial beam of electrons in a cylindrical structure may be made to rotate about the axis. Features of the tube are the absence of an internal focusing structure and resultant simplicity of design, its small size, its low voltages, and its high beam currents. The focusing of the beams and their directional control are accomplished by a magnetic field.

ISSN:0021-8979    

DOI:10.1063/1.1707374

出版商:AIP    

年代:1944

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1707375

出版商:AIP    

年代:1944

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1707376

出版商:AIP    

年代:1944

数据来源: AIP

摘要:

In this paper sixty‐eight nuclear monokinetic electron sources are tabulated. These sources are obtained by producing designated artificial radioactive elements. The voltage of the electrons emitted in the lowest energy group is 17 kev and that in the highest is 578 kev. Applications seem possible in special radio tubes and for certain experiments with electron microscopes and electron diffraction.

ISSN:0021-8979    

DOI:10.1063/1.1707377

出版商:AIP    

年代:1944

数据来源: AIP

摘要:

In electron flow, the net electronic charge may be neutralized by positive ions. In this case, for a given geometry there is a limiting current beyond which homogeneous flow is unstable. This limiting current is evaluated for flow normal to parallel plane equipotentials and for flow filling a conducting tube and constrained to motion parallel to the axis. For parallel planes at a potentialV0volts and spaced a distanceLcm apart, the limiting current density in amperes/cm2isi0=104×10−6V032/L2. For a long conducting tube the limiting current isI0=160×10−6V032. These limiting currents are roughly 6 times as great as in the absence of ions.

ISSN:0021-8979    

DOI:10.1063/1.1707378

出版商:AIP    

年代:1944

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1707379

出版商:AIP    

年代:1944

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1707380

出版商:AIP    

年代:1944

数据来源: AIP