Čerenkov radiation from a finite trajectory of electrons
- 1 November 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 50 (5) , 4041-4050
- https://doi.org/10.1103/physreve.50.4041
Abstract
Properties of radiation emitted by relativistic electrons traveling through a limited trajectory of length L in helium and nitrogen gas at various pressures are experimentally investigated in the visible and the millimeter-wave regions. The radiation was generated by short bunches of electrons from a linear accelerator. In the long-wavelength region the Čerenkov threshold was blotted out, and the observed radiation showed characteristics of transition radiation even if the Čerenkov criterion βn>1 was fulfilled. An alternative criterion β(n-λ/L)>1 is proposed on the basis of the consideration of the formation zone.Keywords
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