University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Microwave spectrometer measurements on the scattering properties of a cylindrical discharge.

Fooks, Edward Henry. (1964) Microwave spectrometer measurements on the scattering properties of a cylindrical discharge. Doctoral thesis, University of Surrey (United Kingdom)..

Available under License Creative Commons Attribution Non-commercial Share Alike.

Download (5MB) | Preview


When a plasma column of an equal number of ions and electrons was placed in a beam of microwave power then, under suitable conditions which were derived, there was an interaction between the microwaves and the electrons in the plasma column. A K-band microwave spectrometer was built in an enclosed parallel plate transmission line system, with a fixed horn and a variable position receiver. A beam of power was directed onto the cylindrical plasma column in the absence of static magnetic fields and with the electric field vector parallel to the plasma axis. The plasma electron density was swept at 50 c/sec., giving a peak density of the order of 8 x 10[18] electrons/metre[3]. The angular scattering of the microwave beam by the plasma column was measured in detail, to determine the variation of the total power within the system as a function of the electron density. The final graph showed two regions with greater absorption of microwave power; one corresponded to the plasma frequency criterion, whilst the other occurred at half this critical electron density. From similar traces obtained over the region 22-26 Gc/sec., the linearity relationship between the electron density and the discharge current was demonstrated. The scattering pattern from the plasma column was more consistent with a geometric optical theory than with a simplified wave theory, even though the column radius was only one and a half wavelengths.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
Fooks, Edward Henry.
Date : 1964
Contributors :
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 1964.
Depositing User : EPrints Services
Date Deposited : 22 Jun 2018 14:27
Last Modified : 06 Nov 2018 16:54

Actions (login required)

View Item View Item


Downloads per month over past year

Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800