Gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

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Gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade. / ASDEX Upgrade Team.

julkaisussa: Physica Scripta, Vuosikerta 2016, Nro T167, 12.01.2016, s. 1-6.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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ASDEX Upgrade Team. / Gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade. Julkaisussa: Physica Scripta. 2016 ; Vuosikerta 2016, Nro T167. Sivut 1-6.

Bibtex - Lataa

@article{d1f3f885bfee4d8c85ccba8386f625f5,
title = "Gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade",
abstract = "We have investigated net and gross erosion of W in the outer strike-point (OSP) region of ASDEX Upgrade with the help of marker probes during low-density/high-temperature L-mode discharges. Post mortem analyses indicate net-erosion rates of 0.04-0.13 nm s-1, with the highest rates measured close to the OSP. Re-deposition was some 30-40{\%} of gross erosion, which is lower than what has earlier been obtained spectroscopically (∼50-60{\%}), possibly due to the special plasma conditions of our experiment and intense flux of W atoms originating from the main chamber. Gross erosion was also estimated by passive emission spectroscopy, and around the OSP the results matched with post mortem data. However, the spectroscopic erosion profile in the poloidal direction was much steeper than the post mortem one. Preliminary ERO simulations have predicted net erosion of the same order of magnitude as experimental results but reproducing the poloidal erosion/re-deposition profiles requires further work.",
keywords = "ASDEX Upgrade, erosion, re-deposition, tokamak, tungsten",
author = "A. Hakola and Airila, {M. I.} and Juuso Karhunen and M. Groth and A. Herrmann and K. Krieger and T. Kurki-Suonio and G. Meisl and M. Oberkofler and R. Neu and S. Potzel and V. Rohde and {ASDEX Upgrade Team}",
year = "2016",
month = "1",
day = "12",
doi = "10.1088/0031-8949/T167/1/014026",
language = "English",
volume = "2016",
pages = "1--6",
journal = "Physica Scripta",
issn = "0031-8949",
number = "T167",

}

RIS - Lataa

TY - JOUR

T1 - Gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

AU - Hakola, A.

AU - Airila, M. I.

AU - Karhunen, Juuso

AU - Groth, M.

AU - Herrmann, A.

AU - Krieger, K.

AU - Kurki-Suonio, T.

AU - Meisl, G.

AU - Oberkofler, M.

AU - Neu, R.

AU - Potzel, S.

AU - Rohde, V.

AU - ASDEX Upgrade Team

PY - 2016/1/12

Y1 - 2016/1/12

N2 - We have investigated net and gross erosion of W in the outer strike-point (OSP) region of ASDEX Upgrade with the help of marker probes during low-density/high-temperature L-mode discharges. Post mortem analyses indicate net-erosion rates of 0.04-0.13 nm s-1, with the highest rates measured close to the OSP. Re-deposition was some 30-40% of gross erosion, which is lower than what has earlier been obtained spectroscopically (∼50-60%), possibly due to the special plasma conditions of our experiment and intense flux of W atoms originating from the main chamber. Gross erosion was also estimated by passive emission spectroscopy, and around the OSP the results matched with post mortem data. However, the spectroscopic erosion profile in the poloidal direction was much steeper than the post mortem one. Preliminary ERO simulations have predicted net erosion of the same order of magnitude as experimental results but reproducing the poloidal erosion/re-deposition profiles requires further work.

AB - We have investigated net and gross erosion of W in the outer strike-point (OSP) region of ASDEX Upgrade with the help of marker probes during low-density/high-temperature L-mode discharges. Post mortem analyses indicate net-erosion rates of 0.04-0.13 nm s-1, with the highest rates measured close to the OSP. Re-deposition was some 30-40% of gross erosion, which is lower than what has earlier been obtained spectroscopically (∼50-60%), possibly due to the special plasma conditions of our experiment and intense flux of W atoms originating from the main chamber. Gross erosion was also estimated by passive emission spectroscopy, and around the OSP the results matched with post mortem data. However, the spectroscopic erosion profile in the poloidal direction was much steeper than the post mortem one. Preliminary ERO simulations have predicted net erosion of the same order of magnitude as experimental results but reproducing the poloidal erosion/re-deposition profiles requires further work.

KW - ASDEX Upgrade

KW - erosion

KW - re-deposition

KW - tokamak

KW - tungsten

UR - http://www.scopus.com/inward/record.url?scp=84959906322&partnerID=8YFLogxK

U2 - 10.1088/0031-8949/T167/1/014026

DO - 10.1088/0031-8949/T167/1/014026

M3 - Article

VL - 2016

SP - 1

EP - 6

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - T167

ER -

ID: 18203567