Accession Number:

ADA151472

Title:

Microwave Emission from Relativistic Electron Beams.

Descriptive Note:

Interim scientific rept. 1 Nov 83-31 Oct 84,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s):

• Bekefi,G.

Report Date:

1984-11-27

Pagination or Media Count:

40.0

Abstract:

A free electron laser equipment is currently underway in which a 1kA, 2.1MeV electron beam is excited by a helical wiggler field of 2 cm periodicity to produce submillimeter radiation at wavelengths between 400 and 600 micrometers. This experiment will operate in the high gain Raman regime with a maximum calculated output power at saturation of approximately 50MW. This free electron is unique in two respects. First, the electron beam will be transported through the wiggler with the aid of two short solenoidal focussing lenses. This system obviates the need for strong uniform guiding magnetic field in the interaction region thereby insuring that the cyclotron maser quality is not excited. Secone, this FEL employs a very high quality electron beam. The beam is produced in a multielectrode electron gun which uses a cold field emission cathode. The gun consists of a planar cathode and anode grid followed by four accelerating stages. The accelerating electrodes are shaped to provide electrostatic focussing by balancing the self-electric and magnetic fields of the beam.

Descriptors:

• *MILLIMETER WAVES
• *FREE ELECTRON LASERS
• *ELECTRON EMISSION
• *MICROWAVE BEAMS
• MAGNETIC FIELDS
• ELECTRIC FIELDS
• ELECTRON BEAMS
• ELECTROMAGNETIC RADIATION
• MAGNETRONS

Subject Categories:

• Lasers and Masers
• Nuclear Physics and Elementary Particle Physics
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE