Overview on plasma operation with a full tungsten wall in ASDEX Upgrade

R. Neu; A. Kallenbach; M. Balden; V. Bobkov; J. W. Coenen; R. Drube; R. Dux; H. Greuner; A. Herrmann; J. Hobirk; H. Höhnle; K. Krieger; M. Kočan; P. Lang; T. Lunt; H. Maier; M. Mayer; H. W. Müller; S. Potzel; T. Pütterich; J. Rapp; V. Rohde; F. Ryter; P. A. Schneider; J. Schweinzer; M. Sertoli; J. Stober; W. Suttrop; K. Sugiyama; G. Van Rooij; M. Wischmeier

doi:10.1016/j.jnucmat.2013.01.006

Overview on plasma operation with a full tungsten wall in ASDEX Upgrade

R. Neu, A. Kallenbach, M. Balden, V. Bobkov, J. W. Coenen, R. Drube, R. Dux, H. Greuner, A. Herrmann, J. Hobirk, H. Höhnle, K. Krieger, M. Kočan, P. Lang, T. Lunt, H. Maier, M. Mayer, H. W. Müller, S. Potzel, T. PütterichJ. Rapp, V. Rohde, F. Ryter, P. A. Schneider, J. Schweinzer, M. Sertoli, J. Stober, W. Suttrop, K. Sugiyama, G. Van Rooij, M. Wischmeier

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Abstract

Operation with all tungsten plasma facing components has become routine in ASDEX Upgrade. The conditioning of the device is strongly simplified and short glow discharges are used only on a daily basis. The long term fuel retention was reduced by more than a factor of 5 as demonstrated in gas balance as well as in post mortem analyses. Injecting nitrogen for radiative cooling, discharges with additional heating power up to 23 MW have been achieved, providing good confinement (H98_y2 = 1), divertor power loads around 5 MW m ² and divertor temperatures below 10 eV. ELM mitigation by pellet ELM pacemaking or magnetic perturbation coils reduces the deposited energy during ELMs, but also keeps the W density at the pedestal low. As a recipe to keep the central W concentration sufficiently low, central (wave) heating is well established and low density H-Modes could be re-established with the newly available ECRH power of up to 4 MW. The ICRH induced W sources could be strongly reduced by applying boron coatings to the poloidal guard limiters.

Original language	English
Pages (from-to)	S34-S41
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.006
State	Published - 2013

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Neu, R., Kallenbach, A., Balden, M., Bobkov, V., Coenen, J. W., Drube, R., Dux, R., Greuner, H., Herrmann, A., Hobirk, J., Höhnle, H., Krieger, K., Kočan, M., Lang, P., Lunt, T., Maier, H., Mayer, M., Müller, H. W., Potzel, S., ... Wischmeier, M. (2013). Overview on plasma operation with a full tungsten wall in ASDEX Upgrade. Journal of Nuclear Materials, 438(SUPPL), S34-S41. https://doi.org/10.1016/j.jnucmat.2013.01.006

@article{2369deb8cfdd4804a76d0760d428b1e2,

title = "Overview on plasma operation with a full tungsten wall in ASDEX Upgrade",

abstract = "Operation with all tungsten plasma facing components has become routine in ASDEX Upgrade. The conditioning of the device is strongly simplified and short glow discharges are used only on a daily basis. The long term fuel retention was reduced by more than a factor of 5 as demonstrated in gas balance as well as in post mortem analyses. Injecting nitrogen for radiative cooling, discharges with additional heating power up to 23 MW have been achieved, providing good confinement (H98y2 = 1), divertor power loads around 5 MW m 2 and divertor temperatures below 10 eV. ELM mitigation by pellet ELM pacemaking or magnetic perturbation coils reduces the deposited energy during ELMs, but also keeps the W density at the pedestal low. As a recipe to keep the central W concentration sufficiently low, central (wave) heating is well established and low density H-Modes could be re-established with the newly available ECRH power of up to 4 MW. The ICRH induced W sources could be strongly reduced by applying boron coatings to the poloidal guard limiters.",

author = "R. Neu and A. Kallenbach and M. Balden and V. Bobkov and Coenen, {J. W.} and R. Drube and R. Dux and H. Greuner and A. Herrmann and J. Hobirk and H. H{\"o}hnle and K. Krieger and M. Ko{\v c}an and P. Lang and T. Lunt and H. Maier and M. Mayer and M{\"u}ller, {H. W.} and S. Potzel and T. P{\"u}tterich and J. Rapp and V. Rohde and F. Ryter and Schneider, {P. A.} and J. Schweinzer and M. Sertoli and J. Stober and W. Suttrop and K. Sugiyama and {Van Rooij}, G. and M. Wischmeier",

year = "2013",

doi = "10.1016/j.jnucmat.2013.01.006",

language = "English",

volume = "438",

pages = "S34--S41",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "SUPPL",

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Neu, R, Kallenbach, A, Balden, M, Bobkov, V, Coenen, JW, Drube, R, Dux, R, Greuner, H, Herrmann, A, Hobirk, J, Höhnle, H, Krieger, K, Kočan, M, Lang, P, Lunt, T, Maier, H, Mayer, M, Müller, HW, Potzel, S, Pütterich, T, Rapp, J, Rohde, V, Ryter, F, Schneider, PA, Schweinzer, J, Sertoli, M, Stober, J, Suttrop, W, Sugiyama, K, Van Rooij, G & Wischmeier, M 2013, 'Overview on plasma operation with a full tungsten wall in ASDEX Upgrade', Journal of Nuclear Materials, vol. 438, no. SUPPL, pp. S34-S41. https://doi.org/10.1016/j.jnucmat.2013.01.006

TY - JOUR

T1 - Overview on plasma operation with a full tungsten wall in ASDEX Upgrade

AU - Neu, R.

AU - Kallenbach, A.

AU - Balden, M.

AU - Bobkov, V.

AU - Coenen, J. W.

AU - Drube, R.

AU - Dux, R.

AU - Greuner, H.

AU - Herrmann, A.

AU - Hobirk, J.

AU - Höhnle, H.

AU - Krieger, K.

AU - Kočan, M.

AU - Lang, P.

AU - Lunt, T.

AU - Maier, H.

AU - Mayer, M.

AU - Müller, H. W.

AU - Potzel, S.

AU - Pütterich, T.

AU - Rapp, J.

AU - Rohde, V.

AU - Ryter, F.

AU - Schneider, P. A.

AU - Schweinzer, J.

AU - Sertoli, M.

AU - Stober, J.

AU - Suttrop, W.

AU - Sugiyama, K.

AU - Van Rooij, G.

AU - Wischmeier, M.

PY - 2013

Y1 - 2013

N2 - Operation with all tungsten plasma facing components has become routine in ASDEX Upgrade. The conditioning of the device is strongly simplified and short glow discharges are used only on a daily basis. The long term fuel retention was reduced by more than a factor of 5 as demonstrated in gas balance as well as in post mortem analyses. Injecting nitrogen for radiative cooling, discharges with additional heating power up to 23 MW have been achieved, providing good confinement (H98y2 = 1), divertor power loads around 5 MW m 2 and divertor temperatures below 10 eV. ELM mitigation by pellet ELM pacemaking or magnetic perturbation coils reduces the deposited energy during ELMs, but also keeps the W density at the pedestal low. As a recipe to keep the central W concentration sufficiently low, central (wave) heating is well established and low density H-Modes could be re-established with the newly available ECRH power of up to 4 MW. The ICRH induced W sources could be strongly reduced by applying boron coatings to the poloidal guard limiters.

AB - Operation with all tungsten plasma facing components has become routine in ASDEX Upgrade. The conditioning of the device is strongly simplified and short glow discharges are used only on a daily basis. The long term fuel retention was reduced by more than a factor of 5 as demonstrated in gas balance as well as in post mortem analyses. Injecting nitrogen for radiative cooling, discharges with additional heating power up to 23 MW have been achieved, providing good confinement (H98y2 = 1), divertor power loads around 5 MW m 2 and divertor temperatures below 10 eV. ELM mitigation by pellet ELM pacemaking or magnetic perturbation coils reduces the deposited energy during ELMs, but also keeps the W density at the pedestal low. As a recipe to keep the central W concentration sufficiently low, central (wave) heating is well established and low density H-Modes could be re-established with the newly available ECRH power of up to 4 MW. The ICRH induced W sources could be strongly reduced by applying boron coatings to the poloidal guard limiters.

UR - http://www.scopus.com/inward/record.url?scp=84885474732&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2013.01.006

DO - 10.1016/j.jnucmat.2013.01.006

M3 - Article

AN - SCOPUS:84885474732

SN - 0022-3115

VL - 438

SP - S34-S41

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL

ER -

Overview on plasma operation with a full tungsten wall in ASDEX Upgrade

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