Slow [Formula presented] Transitions in DIII-D Plasmas

R. J. Colchin; M. J. Schaffer; B. A. Carreras; G. R. McKee; R. Maingi; T. N. Carlstrom; D. L. Rudakov; C. M. Greenfield; T. L. Rhodes; E. J. Doyle; N. H. Brooks; M. E. Austin

doi:10.1103/PhysRevLett.88.255002

Slow [Formula presented] Transitions in DIII-D Plasmas

R. J. Colchin, M. J. Schaffer, B. A. Carreras, G. R. McKee, R. Maingi, T. N. Carlstrom, D. L. Rudakov, C. M. Greenfield, T. L. Rhodes, E. J. Doyle, N. H. Brooks, M. E. Austin

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The transition from the low to the high mode of plasma confinement ([Formula presented] transition) is studied in the DIII-D by an experimental technique which allows an arbitrarily slow transition. During an initial transition, periodic turbulent instability bursts are observed near the separatrix which inhibit the full transition. These bursts are damped by self-generated shear flows, and a predator-prey-type relationship is shown to give a good description of the data. As the neutral-beam power is raised, the oscillations change to type III edge localized modes. Another transition then leads to a quiet [Formula presented] mode.

Original language	English
Pages (from-to)	4
Number of pages	1
Journal	Physical Review Letters
Volume	88
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.88.255002
State	Published - 2002
Externally published	Yes

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title = "Slow [Formula presented] Transitions in DIII-D Plasmas",

abstract = "The transition from the low to the high mode of plasma confinement ([Formula presented] transition) is studied in the DIII-D by an experimental technique which allows an arbitrarily slow transition. During an initial transition, periodic turbulent instability bursts are observed near the separatrix which inhibit the full transition. These bursts are damped by self-generated shear flows, and a predator-prey-type relationship is shown to give a good description of the data. As the neutral-beam power is raised, the oscillations change to type III edge localized modes. Another transition then leads to a quiet [Formula presented] mode.",

author = "Colchin, {R. J.} and Schaffer, {M. J.} and Carreras, {B. A.} and McKee, {G. R.} and R. Maingi and Carlstrom, {T. N.} and Rudakov, {D. L.} and Greenfield, {C. M.} and Rhodes, {T. L.} and Doyle, {E. J.} and Brooks, {N. H.} and Austin, {M. E.}",

year = "2002",

doi = "10.1103/PhysRevLett.88.255002",

language = "English",

volume = "88",

pages = "4",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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TY - JOUR

T1 - Slow [Formula presented] Transitions in DIII-D Plasmas

AU - Colchin, R. J.

AU - Schaffer, M. J.

AU - Carreras, B. A.

AU - McKee, G. R.

AU - Maingi, R.

AU - Carlstrom, T. N.

AU - Rudakov, D. L.

AU - Greenfield, C. M.

AU - Rhodes, T. L.

AU - Doyle, E. J.

AU - Brooks, N. H.

AU - Austin, M. E.

PY - 2002

Y1 - 2002

N2 - The transition from the low to the high mode of plasma confinement ([Formula presented] transition) is studied in the DIII-D by an experimental technique which allows an arbitrarily slow transition. During an initial transition, periodic turbulent instability bursts are observed near the separatrix which inhibit the full transition. These bursts are damped by self-generated shear flows, and a predator-prey-type relationship is shown to give a good description of the data. As the neutral-beam power is raised, the oscillations change to type III edge localized modes. Another transition then leads to a quiet [Formula presented] mode.

AB - The transition from the low to the high mode of plasma confinement ([Formula presented] transition) is studied in the DIII-D by an experimental technique which allows an arbitrarily slow transition. During an initial transition, periodic turbulent instability bursts are observed near the separatrix which inhibit the full transition. These bursts are damped by self-generated shear flows, and a predator-prey-type relationship is shown to give a good description of the data. As the neutral-beam power is raised, the oscillations change to type III edge localized modes. Another transition then leads to a quiet [Formula presented] mode.

UR - http://www.scopus.com/inward/record.url?scp=84862751933&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.88.255002

DO - 10.1103/PhysRevLett.88.255002

M3 - Article

AN - SCOPUS:84862751933

SN - 0031-9007

VL - 88

SP - 4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

ER -

Slow [Formula presented] Transitions in DIII-D Plasmas

Abstract

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