http://www.cnr.it/ontology/cnr/individuo/prodotto/ID281059

Magnetic Field Effect on Voltage Holding in the MITICA Electrostatic Accelerator (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Magnetic Field Effect on Voltage Holding in the MITICA Electrostatic Accelerator (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1109/TPS.2014.2307923 (literal)

Alternative label

Pilan Nicola; Chitarin Giuseppe; De Lorenzi Antonio; Serianni Gianluigi (2014)
Magnetic Field Effect on Voltage Holding in the MITICA Electrostatic Accelerator
in IEEE transactions on plasma science; IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE,, PISCATAWAY, NJ 08855-4141 (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Pilan Nicola; Chitarin Giuseppe; De Lorenzi Antonio; Serianni Gianluigi (literal)

Pagina inizio

1012 (literal)

Pagina fine

1020 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

IEEE transactions on plasma science (Online) Attiva dal: 1988 Editore: IEEE Nuclear and Plasma Sciences Society. - New York Paese di pubblicazione: Stati Uniti d'America Lingua: inglese E-Issn: 1939-9375 Titolo chiave: IEEE transactions on plasma science (Online) Titolo proprio: IEEE transactions on plasma science (Online) Titoli alternativi: Transactions on plasma science (Online) Plasma science (Online) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6755479 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

42 (literal)

Rivista

IEEE transactions on plasma science (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

9 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

4 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

1,2,3,4 : EURATOM, ENEA Fus, Consorzio RFX, I-35127 Padua, Italy. (literal)

Titolo

Magnetic Field Effect on Voltage Holding in the MITICA Electrostatic Accelerator (literal)

Abstract

MITICA is the complete full-scale prototype of a 17 MW heating neutral beam injector for ITER. This experimental device, presently under construction in Padova, includes a negative ion source (H-or D-), and an electrostatic accelerator (1 MV, 40 A, 3600 s). Voltage holding is recognized to be one of the most critical issues for the 1 MV accelerator operations, not only owing to the complex multistage electrostatic accelerator structure, but also for the presence of magnetic field, which is necessary for deflecting the coextracted and secondary electrons as early as possible, before they are accelerated. The required magnetic field is produced by a combination of several sources, such as permanent magnets and current-carrying conductors. To avoid gas breakdown between electrodes, the design of the accelerator shall guarantee that the electrostatic field configuration and the pressure distribution correspond to operating points located far enough on the left side of the well-known Paschen breakdown curve. For this reason, MITICA has been designed so that the (H-2 or D-2) gas pressure multiplied by the distance between electrode (p center dot d) shall not exceed 0.1-0.3 Pa center dot m. However, indications have been found in literature that the presence of magnetic field might shift part of the left branch of the Paschen curve more to the left, thus reducing the above-defined limit and possibly affecting the voltage holding criteria to be used in MITICA design. To support the design of MITICA at low gas pressure and in the presence of magnetic field, an experimental campaign has been carried out at the high-voltage padova test facility; during this campaign, a field distribution similar to that expected in MITICA has been realized. The magnetic field has been produced using permanent magnets located inside the electrodes or outside the vacuum tank. This paper describes the test assembly, procedure adopted, and the experimental findings; the results have been also successfully compared with simulations of the breakdown process. In certain magnetic field configurations, a clear effect has been recognized, indicating a nonnegligible shift to the left of the lower part of the Paschen Curve. (literal)

Editore