The response of the local RF current measured at limiters of 3-strap ICRF antenna to variations of power balance and phasing at fICRF=30MHz agrees qualitatively well with EM calculations by TOPICA and RAPLICASOL codes. Measurements of tungsten sputtering yield and DC current at the limiters correlate strongly with the local RF current. In contrast to findings for the 2-strap antennas, values of DC current are predominantly positive, and negative only for some locations and feeding parameters. Explanations can involve more physical mechanisms than only parallel sheath dynamics.

Characterization of 3-strap antennas in ASDEX Upgrade / Bobkov, Volodymyr; Bilato, Roberto; Colas, Laurent; Dux, Ralph; Faudot, Eric; Faugel, Helmut; Fã¼nfgelder, Helmut; Herrmann, Albrecht; Jacquot, Jonathan; Kallenbach, Arne; Milanesio, Daniele; Maggiora, Riccardo; Neu, Rudolf; Noterdaeme, Jean-Marie; Ochoukov, Roman; Pã¼tterich, Thomas; Tierens, Wouter; Zhang, Wei. - In: EPJ WEB OF CONFERENCES. - ISSN 2101-6275. - STAMPA. - 157:(2017), p. 03005. (Intervento presentato al convegno 22nd Topical Conference on Radio-Frequency Power in Plasmas 2017 tenutosi a Aix-en-provence nel May 30 - June 2, 2017) [10.1051/epjconf/201715703005].

Characterization of 3-strap antennas in ASDEX Upgrade

Milanesio, Daniele;Maggiora, Riccardo;
2017

Abstract

The response of the local RF current measured at limiters of 3-strap ICRF antenna to variations of power balance and phasing at fICRF=30MHz agrees qualitatively well with EM calculations by TOPICA and RAPLICASOL codes. Measurements of tungsten sputtering yield and DC current at the limiters correlate strongly with the local RF current. In contrast to findings for the 2-strap antennas, values of DC current are predominantly positive, and negative only for some locations and feeding parameters. Explanations can involve more physical mechanisms than only parallel sheath dynamics.
2017
File in questo prodotto:
File Dimensione Formato  
Bobkov_RF2017.pdf

accesso aperto

Descrizione: Bobkov_RF2017
Tipologia: 2. Post-print / Author's Accepted Manuscript
Licenza: Creative commons
Dimensione 1 MB
Formato Adobe PDF
1 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2697387
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo