Improvement of uniformity of the negative ion beams by tent-shaped magnetic field in the JT-60 negative ion source

Autor:	K. Mogaki, Masahiro Ohzeki, M. Komata, Mieko Kashiwagi, Norikazu Seki, N. Akino, Atsushi Kojima, Masaya Hanada, Larry R. Grisham, Tatsuo Shimizu, Yuto Terunuma, S. Sasaki, Masafumi Yoshida, Y. Endo, S. Nemoto
Rok vydání:	2014
Předmět:	Materials science Ion beam deposition Ion beam Physics::Plasma Physics Filter (video) Electron Plasma Atomic physics Ion gun Instrumentation Ion Magnetic field
Zdroj:	Review of Scientific Instruments. 85:02B314
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.4830365
Popis:	Non-uniformity of the negative ion beams in the JT-60 negative ion source with the world-largest ion extraction area was improved by modifying the magnetic filter in the source from the plasma grid (PG) filter to a tent-shaped filter. The magnetic design via electron trajectory calculation showed that the tent-shaped filter was expected to suppress the localization of the primary electrons emitted from the filaments and created uniform plasma with positive ions and atoms of the parent particles for the negative ions. By modifying the magnetic filter to the tent-shaped filter, the uniformity defined as the deviation from the averaged beam intensity was reduced from 14% of the PG filter to ∼10% without a reduction of the negative ion production.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14ed71fb564fd81d1a3c484bc4b2feae https://doi.org/10.1063/1.4830365 Zobrazit plný text záznamu