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Pulse compression radar reflectometry for density measurements on fusion plasmas

Abstract

On tokamaks and other toroidal machines, reflectometry is a very rapidly developing technique for density profile measurements, particularly near the edge. Its principle relies on the total reflection of an electromagnetic wave at a cutoff layer, where the critical density is reached and the local refractive index goes to zero. With the new fast frequency synthesizers now available, a method based on pulse compression radar is proposed for plasma reflectometry, overcoming the limitations of the previous reflectometry methods. The measurement can be made on a time-scale which is effectively very short relatively to the plasma fluctuations, and the very high reproducibility and stability of the source allows an absolute calibration of the waveguides to be made, which corrects for the effects of the parasitic reflections. 2 refs., 5 figs.
Authors:
Costley, A; Prentice, R; [1]  Laviron, C; [2]  Prentice, R [3] 
  1. Commission of the European Communities, Abingdon (United Kingdom). JET Joint Undertaking
  2. Compagnie Generale des Matieres Nucleaires (COGEMA), 78 - Velizy-Villacoublay (France)
  3. Toulouse-3 Univ., 31 (France). Centre d`Etude Spatiale des Rayonnements
Publication Date:
Jul 01, 1994
Product Type:
Conference
Report Number:
JET-P-94-29; CONF-9406270-
Reference Number:
SCA: 700320; PA: AIX-28:032636; EDB-97:058883; SN: 97001766230
Resource Relation:
Conference: 21. EPS conference on controlled fusion and plasma physics, Montpellier (France), 27 Jun - 1 Jul 1994; Other Information: PBD: Jul 1994; Related Information: Is Part Of Controlled fusion and plasma physics; PB: 240 p.
Subject:
70 PLASMA PHYSICS AND FUSION; PLASMA DIAGNOSTICS; PLASMA DENSITY; RADAR; JET TOKAMAK; PLASMA INSTABILITY; REFLECTION; TOKAMAK DEVICES
OSTI ID:
456166
Research Organizations:
Commission of the European Communities, Abingdon (United Kingdom). JET Joint Undertaking
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Other: ON: DE97621358; TRN: FR9701756032636
Availability:
INIS; OSTI as DE97621358
Submitting Site:
FRN
Size:
pp. 31-36
Announcement Date:

Citation Formats

Costley, A, Prentice, R, Laviron, C, and Prentice, R. Pulse compression radar reflectometry for density measurements on fusion plasmas. France: N. p., 1994. Web.
Costley, A, Prentice, R, Laviron, C, & Prentice, R. Pulse compression radar reflectometry for density measurements on fusion plasmas. France.
Costley, A, Prentice, R, Laviron, C, and Prentice, R. 1994. "Pulse compression radar reflectometry for density measurements on fusion plasmas." France.
@misc{etde_456166,
title = {Pulse compression radar reflectometry for density measurements on fusion plasmas}
author = {Costley, A, Prentice, R, Laviron, C, and Prentice, R}
abstractNote = {On tokamaks and other toroidal machines, reflectometry is a very rapidly developing technique for density profile measurements, particularly near the edge. Its principle relies on the total reflection of an electromagnetic wave at a cutoff layer, where the critical density is reached and the local refractive index goes to zero. With the new fast frequency synthesizers now available, a method based on pulse compression radar is proposed for plasma reflectometry, overcoming the limitations of the previous reflectometry methods. The measurement can be made on a time-scale which is effectively very short relatively to the plasma fluctuations, and the very high reproducibility and stability of the source allows an absolute calibration of the waveguides to be made, which corrects for the effects of the parasitic reflections. 2 refs., 5 figs.}
place = {France}
year = {1994}
month = {Jul}
}