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Title: Microwave frequency sweep interferometer for plasma density measurements in ECR ion sources: Design and preliminary results

The Electron Cyclotron Resonance Ion Sources (ECRISs) development is strictly related to the availability of new diagnostic tools, as the existing ones are not adequate to such compact machines and to their plasma characteristics. Microwave interferometry is a non-invasive method for plasma diagnostics and represents the best candidate for plasma density measurement in hostile environment. Interferometry in ECRISs is a challenging task mainly due to their compact size. The typical density of ECR plasmas is in the range 10{sup 11}–10{sup 13} cm{sup −3} and it needs a probing beam wavelength of the order of few centimetres, comparable to the chamber radius. The paper describes the design of a microwave interferometer developed at the LNS-INFN laboratories based on the so-called “frequency sweep” method to filter out the multipath contribution in the detected signals. The measurement technique and the preliminary results (calibration) obtained during the experimental tests will be presented.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ; ; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. INFN - Laboratori Nazionali del Sud, Via S. Sofia 62, 95125 Catania (Italy)
  2. (Italy)
  3. University Mediterranea of Reggio Calabria, Reggio Calabria (Italy)
Publication Date:
OSTI Identifier:
22483016
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; AVAILABILITY; CALIBRATION; DESIGN; ECR ION SOURCES; ELECTRON CYCLOTRON-RESONANCE; INTERFEROMETERS; INTERFEROMETRY; ION BEAMS; MICROWAVE RADIATION; PLASMA DENSITY; PLASMA DIAGNOSTICS; SIGNALS; WAVELENGTHS