MEASUREMENT OF MAGNETIC-FIELD FLUCTUATIONS WITHIN LAST CLOSED FLUX SURFACE WITH MOVABLE MAGNETIC PROBE ARRAY IN THE JIPP T-IIU TOKAMAK

Authors
KITACHI K OIKE T OHDACHI S TOI K AKIYAMA R EJIRI A HAMADA Y KURAMOTO H NARIHARA K SEKI T
Citation
K. Kitachi et al., MEASUREMENT OF MAGNETIC-FIELD FLUCTUATIONS WITHIN LAST CLOSED FLUX SURFACE WITH MOVABLE MAGNETIC PROBE ARRAY IN THE JIPP T-IIU TOKAMAK, Fusion engineering and design, 34-5, 1997, pp. 733-736
Citations number
8
Categorie Soggetti
Nuclear Sciences & Tecnology
Journal title
Fusion engineering and design → ACNP
ISSN journal
09203796
Volume
34-5
Year of publication
1997
Pages
733 - 736
Database
ISI
SICI code
0920-3796(1997)34-5:<733:MOMFWL>2.0.ZU;2-J
Abstract
Poloidal and radial magnetic field fluctuations less than 100 kHz are measured with a newly developed movable magnetic probe array in the JI PP T-IIU tokamak. The probe array protected by a carbon-carbon composi te with 20% boron is inserted beyond the last closed flux surface (LFC S) up to r/a approximate to 0.77 without deleterious effect on ohmical ly and neutral beam heated plasmas. From the radial variation in the f luctuation amplitude just outside the LCFS the poloidal mode number m is estimated to be 4 or less for the low frequency coherent part (f<30 kHz) and about 10 for the relatively high frequency incoherent part ( f>50 kHz). (C) 1997 Elsevier Science S.A.