Matches in SemOpenAlex for { <https://semopenalex.org/work/W172847206> ?p ?o ?g. }
Showing items 1 to 93 of
93
with 100 items per page.
- W172847206 abstract "In magnetically confined plasmas, several improved confinement modes such as H-mode and internal transport barrier have been discovered and discussed from the viewpoint of the influence of the low-order rational surfaces [1,2]. In the previous study of the spontaneous transition in ECH plasmas of a low magnetic shear helical device Heliotron J [3], the enhancement factor of the plasma confinement after the transition has been discussed with regard to the rotational transform at the plasma edge. The control of the toroidal current in the low magnetic shear device is essential for the control of the radial profile of the rotational transform. In Heliotron J, the control of the non-inductive toroidal current has been demonstrated using the neutral beam current drive (NBCD) or the electron cyclotron current drive in conjunction with the bootstrap (BS) current control by changing one of the magnetic Fourier component, bumpiness, which is the mirror ratio along the toroidal direction [4,5]. In the recent NBI discharges of Heliotron J, a spontaneous transition has been observed with a sudden drop of the Hc line-emission intensity and increase in the stored energy. In this study, we present the characteristics of the spontaneous transition and its dependence on the NBI power and the bumpy field component. 2. Experimental Results Heliotron J is the medium sized (R/a = 1.2m/0.17m) experimental device with an L/M = 1/4 helical winding coil, where L and M are the pole number of the helical coil and the helical pitch number of the filed along the toroidal direction, respectively. The confinement field is controlled using the five types of the external coils, the helical coil, two types of the toroidal coils (TA and TB) and two sets of the vertical coils. Two tangentially beamlines (BL2 and BL1) of NBI have been installed in the co- (Co) and counter- (CTR) directions whose maximum power and voltage are 0.7 MW and 30 keV, respectively. Figure 1 show the time evolution of the plasma stored energy, the line averaged electron density, the toroidal current and the Hc intensity in the Co and CTR injected NBI plasmas in the configuration of the edge rotational transform k(a)/2r = 0.54. The initial plasma was produced by the 70GHz 2 nd harmonic electron cyclotron heating (ECH), after that, the" @default.
- W172847206 created "2016-06-24" @default.
- W172847206 creator A5027829803 @default.
- W172847206 creator A5038029729 @default.
- W172847206 creator A5059110095 @default.
- W172847206 creator A5068022677 @default.
- W172847206 creator A5072524053 @default.
- W172847206 creator A5073836503 @default.
- W172847206 creator A5076037810 @default.
- W172847206 creator A5076329866 @default.
- W172847206 creator A5078732503 @default.
- W172847206 creator A5081576426 @default.
- W172847206 creator A5085466381 @default.
- W172847206 creator A5091710790 @default.
- W172847206 date "2007-01-01" @default.
- W172847206 modified "2023-09-27" @default.
- W172847206 title "Study of Spontaneous Transition in NBI Plasmas of Heliotron J" @default.
- W172847206 hasPublicationYear "2007" @default.
- W172847206 type Work @default.
- W172847206 sameAs 172847206 @default.
- W172847206 citedByCount "0" @default.
- W172847206 crossrefType "journal-article" @default.
- W172847206 hasAuthorship W172847206A5027829803 @default.
- W172847206 hasAuthorship W172847206A5038029729 @default.
- W172847206 hasAuthorship W172847206A5059110095 @default.
- W172847206 hasAuthorship W172847206A5068022677 @default.
- W172847206 hasAuthorship W172847206A5072524053 @default.
- W172847206 hasAuthorship W172847206A5073836503 @default.
- W172847206 hasAuthorship W172847206A5076037810 @default.
- W172847206 hasAuthorship W172847206A5076329866 @default.
- W172847206 hasAuthorship W172847206A5078732503 @default.
- W172847206 hasAuthorship W172847206A5081576426 @default.
- W172847206 hasAuthorship W172847206A5085466381 @default.
- W172847206 hasAuthorship W172847206A5091710790 @default.
- W172847206 hasConcept C115260700 @default.
- W172847206 hasConcept C116515362 @default.
- W172847206 hasConcept C121332964 @default.
- W172847206 hasConcept C148043351 @default.
- W172847206 hasConcept C15001198 @default.
- W172847206 hasConcept C160988588 @default.
- W172847206 hasConcept C184779094 @default.
- W172847206 hasConcept C185544564 @default.
- W172847206 hasConcept C2776059347 @default.
- W172847206 hasConcept C2780263432 @default.
- W172847206 hasConcept C30403606 @default.
- W172847206 hasConcept C39527238 @default.
- W172847206 hasConcept C46141821 @default.
- W172847206 hasConcept C62520636 @default.
- W172847206 hasConcept C82706917 @default.
- W172847206 hasConcept C97355855 @default.
- W172847206 hasConceptScore W172847206C115260700 @default.
- W172847206 hasConceptScore W172847206C116515362 @default.
- W172847206 hasConceptScore W172847206C121332964 @default.
- W172847206 hasConceptScore W172847206C148043351 @default.
- W172847206 hasConceptScore W172847206C15001198 @default.
- W172847206 hasConceptScore W172847206C160988588 @default.
- W172847206 hasConceptScore W172847206C184779094 @default.
- W172847206 hasConceptScore W172847206C185544564 @default.
- W172847206 hasConceptScore W172847206C2776059347 @default.
- W172847206 hasConceptScore W172847206C2780263432 @default.
- W172847206 hasConceptScore W172847206C30403606 @default.
- W172847206 hasConceptScore W172847206C39527238 @default.
- W172847206 hasConceptScore W172847206C46141821 @default.
- W172847206 hasConceptScore W172847206C62520636 @default.
- W172847206 hasConceptScore W172847206C82706917 @default.
- W172847206 hasConceptScore W172847206C97355855 @default.
- W172847206 hasLocation W1728472061 @default.
- W172847206 hasOpenAccess W172847206 @default.
- W172847206 hasPrimaryLocation W1728472061 @default.
- W172847206 hasRelatedWork W108931672 @default.
- W172847206 hasRelatedWork W1489885286 @default.
- W172847206 hasRelatedWork W161189674 @default.
- W172847206 hasRelatedWork W1996318149 @default.
- W172847206 hasRelatedWork W2001182496 @default.
- W172847206 hasRelatedWork W2026508783 @default.
- W172847206 hasRelatedWork W2053472650 @default.
- W172847206 hasRelatedWork W2056063480 @default.
- W172847206 hasRelatedWork W2065540372 @default.
- W172847206 hasRelatedWork W2066539668 @default.
- W172847206 hasRelatedWork W2071022076 @default.
- W172847206 hasRelatedWork W2265185236 @default.
- W172847206 hasRelatedWork W2750486189 @default.
- W172847206 hasRelatedWork W2786609088 @default.
- W172847206 hasRelatedWork W2789856169 @default.
- W172847206 hasRelatedWork W60992273 @default.
- W172847206 hasRelatedWork W786453615 @default.
- W172847206 hasRelatedWork W89450229 @default.
- W172847206 hasRelatedWork W9214508 @default.
- W172847206 hasRelatedWork W2900078307 @default.
- W172847206 isParatext "false" @default.
- W172847206 isRetracted "false" @default.
- W172847206 magId "172847206" @default.
- W172847206 workType "article" @default.