Performance Analysis of the ITER Plasma Position Reflectometry (PPR) Ex-vessel Transmission Lines

J. Martínez-Fernández, A. Simonetto, Cappa, M. E. Rincón, S. Cabrera, F. J. Ramos

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

As the design of the ITER Plasma Position Reflectometry (PPR) diagnostic progresses, some segments of the transmission line have become fully specified and estimations of their performance can already be obtained. This work presents the calculations carried out for the longest section of the PPR, which is in final state of design and will be the main contributor to the total system performance. Considering the 88.9 mm circular corrugated waveguide (CCWG) that was previously chosen, signal degradation calculations have been performed. Different degradation sources have been studied: ohmic attenuation losses for CCWG; mode conversion losses for gaps, mitre bends, waveguide sag and different types of misalignments; reflection and absorption losses due to microwave windows and coupling losses to free space Gaussian beam. Contributions from all these sources have been integrated to give a global estimation of performance in the transmission lines segments under study.

Original languageEnglish
Pages (from-to)273-287
Number of pages15
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Volume39
Issue number3
DOIs
StatePublished - 1 Mar 2018

Bibliographical note

Funding Information:
Funding Information The work leading to this publication has been funded partially by Fusion for Energy under Specific Grant Agreements F4E-FPA-375-SG03 and F4E-FPA-375-SG05.

Publisher Copyright:
© 2017, Springer Science+Business Media, LLC, part of Springer Nature.

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

Keywords

  • Circular corrugated waveguides
  • ITER diagnostics
  • Reflectometry

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