Speaker
Jiri Adamek
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.1025.pdf
Type-I ELM energy density measurements in the COMPASS divertor using
a new system of probes
J. Adamek1, J. Seidl1, J. Horacek1, M. Komm1, T. Eich2, R. Panek1, J. Cavalier1,3, A. Devitre4,
M. Peterka1, P. Vondracek1,5, J. Stöckel1, D. Sestak1, O. Grover1,6, P. Bilkova1, P. Böhm1,
J. Varju1, A. Havranek1,7, V. Weinzettl1, J. Lovell8,9, M. Dimitrova1, K. Mitosinkova1,5,
R. Dejarnac1, M. Hron1, The COMPASS Team1 and The EUROfusion MST1 Team10
1
Institute of Plasma Physics of the CAS, Prague, Czech Republic
2
Max-Planck-Institut für Plasmaphysik, Garching, Germany
3
Institut Jean Lamour IJL, Université de Lorraine, Vandoeuvre-lčs-Nancy, France
4
Faculté des sciences et techniques, Université de Lorraine, Vandoeuvre-lès-Nancy, France
5
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
6
Faculty of Nuclear Physics and Engineering, Czech Technical University in Prague, Prague,
Czech Republic
7
Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czech
Republic
8
Department of Physics, Durham University, Durham,United Kingdom
9
Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxon, United Kingdom
10
See the author list of Meyer H. et al 2017 Nucl. Fusion 57 102014
A new system of probes [1] was recently installed in the divertor of the COMPASS tokamak in
order to investigate the electron temperature Te and the parallel heat flux q|| with high spatial
and temporal resolution. The set of probes, with spatial resolution ~3.5 mm, consists of two
arrays of rooftop-shaped Langmuir probes (LPs) used to measure the floating potential and the
ion saturation current density and one array of ball-pen probes (BPPs) used to measure the
plasma potential. The floating BPPs and LPs yield the electron temperature Te [2]. In
combination with ion saturation current measurements from LPs we also obtain the parallel
heat flux q|| with microsecond temporal resolution. The ELM energy density || is calculated as
the integral of the parallel heat flux over the duration of a single ELM event. The Type-I ELM
energy density was studied during a set of NBI-assisted ELMy H-mode discharges. The
resulting peak values of || in the range of 10-40 kJ/m2 [1] are in good agreement with the
predictions of model [3] and experimental data from JET, AUG and MAST [3].
[1] J. Adamek et al. Nucl. Fusion 57 (2017) 116017.
[2] J. Adamek et al. Rev. Sci. Instrum. 87 (2016) 043510.
[3] T. Eich et al. Nuclear Materials and Energy 12 (2017) 84–90.
