1992
DOI: 10.1088/0029-5515/32/12/i02
|View full text |Cite
|
Sign up to set email alerts
|

Effect of resonant magnetic perturbations on COMPASS-C tokamak discharges

Abstract: Experimental results from the COMPASS-C tokamak reveal a sharp threshold in amplitude above which externally applied static resonant magnetic perturbations (RMPs) induce stationary magnetic islands. Such islands (in particular, m = 2, n = 1 islands) give rise to a significant degradation in energy and particle confinement, suppression of the sawtooth oscillation and a large change in the impurity ion toroidal velocity. The observed threshold for inducing stationary (2,l) islands is consistent with a phenomenol… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
5

Citation Types

33
446
2

Year Published

1995
1995
2021
2021

Publication Types

Select...
7
2

Relationship

0
9

Authors

Journals

citations
Cited by 312 publications
(481 citation statements)
references
References 25 publications
33
446
2
Order By: Relevance
“…(a) Helical field penetration: For the plasma being originally stable to tearing modes, an applied resonant helical field (or error fields of experimental devices) can penetrate through the resonant surface and generate a magnetic island there [1][2][3][4][5][6][7][8][9]. Recently it was shown on TEXTOR that the relative frequency between the mode and the helical field is important in determining the field penetration [5,6], being in agreement with theoretical results [7][8][9].…”
Section: Introductionmentioning
confidence: 58%
See 1 more Smart Citation
“…(a) Helical field penetration: For the plasma being originally stable to tearing modes, an applied resonant helical field (or error fields of experimental devices) can penetrate through the resonant surface and generate a magnetic island there [1][2][3][4][5][6][7][8][9]. Recently it was shown on TEXTOR that the relative frequency between the mode and the helical field is important in determining the field penetration [5,6], being in agreement with theoretical results [7][8][9].…”
Section: Introductionmentioning
confidence: 58%
“…(b) Mode locking: The locking of large magnetic islands by error fields is often observed in experiments, leading to severe confinement degradation in tokamak plasmas or even to disruptions [1,10,11]. The mode locking threshold is predicted to be much lower in a fusion reactor than in existing tokamaks due to the stronger magnetic field and lower plasma rotation speed [12].…”
Section: Introductionmentioning
confidence: 99%
“…Techniques to avoid large ELMs are therefore being investigated, for example ELM loss reduction by injection of cryogenic pellets [3], small ELM regimes [4][5][6] and stationary ELM-free regimes [7,8]. It has been observed early on in COMPASS-D that non-axisymmetric error fields can reduce the size of ELMs [9]. More recently, ELM mitigation is studied in DIII-D with more edge-localised n = 3 magnetic perturbations produced by a set of 2 × 6 in-vessel saddle coils [10].…”
Section: Introductionmentioning
confidence: 99%
“…These perturbations can lead to a significant degradation of confinement [2][3][4], but also can be used to improve the performance [5,6]. A tokamak plasma responds to a nonaxisymmetric magnetic perturbation by producing perturbed plasma currents.…”
Section: Introductionmentioning
confidence: 99%