Survey of H-mode transition and confinement from ASDEX upgrade 'H-mode standard shot'

F. Ryter; H. U. Fahrbach; A. Gude; R. Neu; V. Rohde; J. Stober

doi:10.1088/0741-3335/44/5A/344

Survey of H-mode transition and confinement from ASDEX upgrade 'H-mode standard shot'

F. Ryter, H. U. Fahrbach, A. Gude, R. Neu, V. Rohde, J. Stober

Max Planck Institute for Plasma Physics

Research output: Contribution to journal › Conference article › peer-review

22 Scopus citations

Abstract

The H-mode standard shot of ASDEX Upgrade provides an overview of the long term evolution of machine conditions and scatter of H-mode power threshold and confinement. This type-I ELMy H-mode is run every day of plasma operation since 1999. After a long opening for in-vessel work, the power threshold drops rapidly by about 50% over 100 discharges and then much slower by about 20% over the remaining 1000 plasma discharges made in a campaign. At the natural density without gas puffing, confinement increases by about 30% over about 500 discharges. Afterwards the peak-to-peak scatter is about 20%, smaller at high density. Conditioning causes changes of edge density and temperature, similar to the confinement degradation observed with gas puffing.

Original language	English
Article number	344
Pages (from-to)	A407-A413
Journal	Plasma Physics and Controlled Fusion
Volume	44
Issue number	5 A
DOIs	https://doi.org/10.1088/0741-3335/44/5A/344
State	Published - May 2002
Externally published	Yes
Event	8th IAEA Technical Committee Meeting on H-Mode Physics and Transport Barriers - Toki, Japan Duration: 5 Sep 2001 → 7 Sep 2001

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10.1088/0741-3335/44/5A/344

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title = "Survey of H-mode transition and confinement from ASDEX upgrade 'H-mode standard shot'",

abstract = "The H-mode standard shot of ASDEX Upgrade provides an overview of the long term evolution of machine conditions and scatter of H-mode power threshold and confinement. This type-I ELMy H-mode is run every day of plasma operation since 1999. After a long opening for in-vessel work, the power threshold drops rapidly by about 50% over 100 discharges and then much slower by about 20% over the remaining 1000 plasma discharges made in a campaign. At the natural density without gas puffing, confinement increases by about 30% over about 500 discharges. Afterwards the peak-to-peak scatter is about 20%, smaller at high density. Conditioning causes changes of edge density and temperature, similar to the confinement degradation observed with gas puffing.",

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AU - Ryter, F.

AU - Fahrbach, H. U.

AU - Gude, A.

AU - Neu, R.

AU - Rohde, V.

AU - Stober, J.

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AB - The H-mode standard shot of ASDEX Upgrade provides an overview of the long term evolution of machine conditions and scatter of H-mode power threshold and confinement. This type-I ELMy H-mode is run every day of plasma operation since 1999. After a long opening for in-vessel work, the power threshold drops rapidly by about 50% over 100 discharges and then much slower by about 20% over the remaining 1000 plasma discharges made in a campaign. At the natural density without gas puffing, confinement increases by about 30% over about 500 discharges. Afterwards the peak-to-peak scatter is about 20%, smaller at high density. Conditioning causes changes of edge density and temperature, similar to the confinement degradation observed with gas puffing.

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Survey of H-mode transition and confinement from ASDEX upgrade 'H-mode standard shot'

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