𝔖 Bobbio Scriptorium
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ICRF-edge plasma investigations in phaedrus-B

✍ Scribed by R. Majeski; T. Tanaka; T. Intrator; N. Hershkowitz; K. Ko; W. Grossman; A. Drobot

Book ID
103932529
Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
1010 KB
Volume
12
Category
Article
ISSN
0920-3796

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✦ Synopsis

We describe experiments which investigate the characteristics of a test ICRF coupler. The RF magnetic fields near the antenna are measured in vacuum and in plasma. Results are modelled using the code ANTENA in plasma; details of the vacuum fields are modelled with the code ARGUS. For the plasma experiments, the antenna is mounted in the central cell of the Phaedrus-B tandem mirror. ICRP modification of the edge plasma potential at the Faraday shield and coupling to electrostatic modes are also investigated.

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The plasma boundary in front of and outside the JET ICRF antenna Faraday screen has been studied using Langmuir probes. Plasma densities of ns -10'5-10'6 rns3 and electron temperatures T, -20-80 eV have been measured at the Faraday screen. Both ns and T, scale almost linearly with total input power