TY - JOUR
T1 - Density limit of H-mode plasmas on JET-ILW
AU - Huber, A.
AU - Brezinsek, S.
AU - Sergienko, G.
AU - Groth, M.
AU - De Vries, P. C.
AU - Aho-Mantila, Leena
AU - Arnoux, G.
AU - Bernert, M.
AU - Beurskens, M. N.A.
AU - Calabrò, G.
AU - Clever, M.
AU - Esser, H.G.
AU - Guillemaut, C.
AU - Jachmich, S.
AU - Järvinen, Aaro
AU - Linsmeier, Ch.
AU - Matthews, G. F.
AU - Meigs, A.G.
AU - Mertens, Ph.
AU - Philipps, V.
AU - Stamp, M.
AU - Wischmeier, M.
AU - Wiesen, S.
AU - JET-EFDA contributors
N1 - Funding Information:
This work, supported by the European Communities under the contract of Association between EURATOM and FZJ, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Publisher Copyright:
© 2014 EURATOM.
PY - 2015
Y1 - 2015
N2 - High-density discharges on JET with ITER-like Wall (ILW)
have been analysed with the aim of establishing a
mechanism for the H-mode density limit (DL) and compared
with experiments in the JET carbon material
configuration. The density limit is up to 20% higher in
the JET-ILW than in the JET-C machine. The observed
H-mode density limit is found close to the Greenwald
limit. It is sensitive to the main plasma shape and is
almost independent of the heating power. It has been
observed that the transition from H-mode to L-mode is not
always an abrupt event but may exhibit a series of H-L-H
transitions, the so-called "dithering H-mode".
It was observed that detachment, as well as the X-point
MARFE itself, does not trigger the H-L transition and
thus does not present a limit on the plasma density and
that it is the plasma confinement which is ultimately
responsible for the H-mode DL.
AB - High-density discharges on JET with ITER-like Wall (ILW)
have been analysed with the aim of establishing a
mechanism for the H-mode density limit (DL) and compared
with experiments in the JET carbon material
configuration. The density limit is up to 20% higher in
the JET-ILW than in the JET-C machine. The observed
H-mode density limit is found close to the Greenwald
limit. It is sensitive to the main plasma shape and is
almost independent of the heating power. It has been
observed that the transition from H-mode to L-mode is not
always an abrupt event but may exhibit a series of H-L-H
transitions, the so-called "dithering H-mode".
It was observed that detachment, as well as the X-point
MARFE itself, does not trigger the H-L transition and
thus does not present a limit on the plasma density and
that it is the plasma confinement which is ultimately
responsible for the H-mode DL.
UR - http://www.scopus.com/inward/record.url?scp=84937727111&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2014.11.055
DO - 10.1016/j.jnucmat.2014.11.055
M3 - Article
VL - 463
SP - 445
EP - 449
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
M1 - 48649
ER -