Boronization in DIII-D

G. L. Jackson; J. Winter; K. H. Burrell; J. C. DeBoo; C. M. Greenfield; R. J. Groebner; T. Hodapp; K. Holtrop; A. G. Kellman; R. Lee; S. I. Lippmann; R. Moyer; J. Phillips; T. S. Taylor; J. Watkins; W. P. West

doi:10.1016/S0022-3115(06)80038-3

Boronization in DIII-D

G. L. Jackson, J. Winter, K. H. Burrell, J. C. DeBoo, C. M. Greenfield, R. J. Groebner, T. Hodapp, K. Holtrop, A. G. Kellman, R. Lee, S. I. Lippmann, R. Moyer, J. Phillips, T. S. Taylor, J. Watkins, W. P. West

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84 Scopus citations

Abstract

A thin boron film has been applied to the DIII-D tokamak plasma facing surfaces to reduce impurity influx, particularly oxygen and carbon. A direct result of this surface modification was the observation of a regime of very high energy confinement, VH-mode, with confinement times from 1.5 to 2 times greater than predicted by the H-mode scaling relation for the same set of parameters. VH-mode discharges are characterized by low ohmic target densities, low edge neutral pressure, and reduced recycling. These conditions have reduced the collisionality ν^* in the edge region producing a higher edge pressure gradient and a significant bootstrap current, up to 30% of the total current. We will describe the edge plasma properties after boronization including reductions in recycling inferred from measurements of τ_p^*. In particular we will discuss the edge plasma conditions necessary for access to VH-mode including the boronization process and properties of the deposited film.

Original language	English
Pages (from-to)	236-240
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	196-198
Issue number	C
DOIs	https://doi.org/10.1016/S0022-3115(06)80038-3
State	Published - Dec 1 1992
Externally published	Yes

Funding

This work was supported by the US Department of Energy under Contract no. DE-AC03-89ER51114.

Funders	Funder number
US Department of Energy

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/S0022-3115(06)80038-3

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title = "Boronization in DIII-D",

abstract = "A thin boron film has been applied to the DIII-D tokamak plasma facing surfaces to reduce impurity influx, particularly oxygen and carbon. A direct result of this surface modification was the observation of a regime of very high energy confinement, VH-mode, with confinement times from 1.5 to 2 times greater than predicted by the H-mode scaling relation for the same set of parameters. VH-mode discharges are characterized by low ohmic target densities, low edge neutral pressure, and reduced recycling. These conditions have reduced the collisionality ν* in the edge region producing a higher edge pressure gradient and a significant bootstrap current, up to 30% of the total current. We will describe the edge plasma properties after boronization including reductions in recycling inferred from measurements of τp*. In particular we will discuss the edge plasma conditions necessary for access to VH-mode including the boronization process and properties of the deposited film.",

author = "Jackson, {G. L.} and J. Winter and Burrell, {K. H.} and DeBoo, {J. C.} and Greenfield, {C. M.} and Groebner, {R. J.} and T. Hodapp and K. Holtrop and Kellman, {A. G.} and R. Lee and Lippmann, {S. I.} and R. Moyer and J. Phillips and Taylor, {T. S.} and J. Watkins and West, {W. P.}",

year = "1992",

month = dec,

day = "1",

doi = "10.1016/S0022-3115(06)80038-3",

language = "English",

volume = "196-198",

pages = "236--240",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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TY - JOUR

T1 - Boronization in DIII-D

AU - Jackson, G. L.

AU - Winter, J.

AU - Burrell, K. H.

AU - DeBoo, J. C.

AU - Greenfield, C. M.

AU - Groebner, R. J.

AU - Hodapp, T.

AU - Holtrop, K.

AU - Kellman, A. G.

AU - Lee, R.

AU - Lippmann, S. I.

AU - Moyer, R.

AU - Phillips, J.

AU - Taylor, T. S.

AU - Watkins, J.

AU - West, W. P.

PY - 1992/12/1

Y1 - 1992/12/1

N2 - A thin boron film has been applied to the DIII-D tokamak plasma facing surfaces to reduce impurity influx, particularly oxygen and carbon. A direct result of this surface modification was the observation of a regime of very high energy confinement, VH-mode, with confinement times from 1.5 to 2 times greater than predicted by the H-mode scaling relation for the same set of parameters. VH-mode discharges are characterized by low ohmic target densities, low edge neutral pressure, and reduced recycling. These conditions have reduced the collisionality ν* in the edge region producing a higher edge pressure gradient and a significant bootstrap current, up to 30% of the total current. We will describe the edge plasma properties after boronization including reductions in recycling inferred from measurements of τp*. In particular we will discuss the edge plasma conditions necessary for access to VH-mode including the boronization process and properties of the deposited film.

AB - A thin boron film has been applied to the DIII-D tokamak plasma facing surfaces to reduce impurity influx, particularly oxygen and carbon. A direct result of this surface modification was the observation of a regime of very high energy confinement, VH-mode, with confinement times from 1.5 to 2 times greater than predicted by the H-mode scaling relation for the same set of parameters. VH-mode discharges are characterized by low ohmic target densities, low edge neutral pressure, and reduced recycling. These conditions have reduced the collisionality ν* in the edge region producing a higher edge pressure gradient and a significant bootstrap current, up to 30% of the total current. We will describe the edge plasma properties after boronization including reductions in recycling inferred from measurements of τp*. In particular we will discuss the edge plasma conditions necessary for access to VH-mode including the boronization process and properties of the deposited film.

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U2 - 10.1016/S0022-3115(06)80038-3

DO - 10.1016/S0022-3115(06)80038-3

M3 - Article

AN - SCOPUS:4243913496

SN - 0022-3115

VL - 196-198

SP - 236

EP - 240

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - C

ER -

Boronization in DIII-D

Abstract

Funding

UN SDGs

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