M. Komm
24528760100
Publications - 3
Overview of the COMPASS results
S. Brezinsek
M. Gobbin
W. Bin
K. Bogár
I. Borodkina
P. Buratti
J. Seidl
M. Peterka
A. Kallenbach
N. Patel
O. Kovanda
A. Podolnik
I. Ďuran
M. Dimitrova
P. Bilková
R. Roccella
A. Casolari
C. Castaldo
M. Hron
J. Čaloud
J. Gerardin
M. Berta
T. Markovic
A. Devitre
M. Komm
O. Grover
E. Macúšová
V. Yanovskiy
F. J. Artola
S. Atikukke
P. Hacek
None Fuková
E. Gauthier
M. Jirsa
P. Junek
E. Matveeva
D. Cipciar
J. Mlynar
D. Naydenkova
J. Matějíček
K. Kovarik
I. Mysiura
F. Napoli
J. K. Park
M. Poradzinski
J. Preinhaelter
P. Kulhánek
M. Lehnen
N. Lemoine
G. Mazzitelli
D. Šesták
M. Rabinski
A. Marin Roldan
X. Litaudon
Y. Q. Liu
J. Adamek
J. Horacek
D. Tskhakaya
A. Prishvitsin
R. Pánek
P. Barton
P. Mácha
R. Dejarnac
F. Brochard
J. Havlicek
A. Havranek
J. Čečrdle
J. Čeřovský
C. Hidalgo
P. Lourenco
K. Hromasová
O. Hronova
M. Iafrati
N. Isernia
R. Pitts
S. Entler
M. Farník
H. Fernandes
G. Grenfell
Y. Gribov
M. Grof
L. Kripner
T. Loarer
A. Loarte
N. C. Logan
L. Krlín
P. Böhm
J. Cavalier
O. Ficker
M. Imrišek
F. Jaulmes
M. Jeřáb
D. Réfy
J. Krbec
O. Bogár
S. Lukes
P. Pavlo
A. Bencze
J. P. Gunn
D. Fridrich
Publication Name: Nuclear Fusion
Publication Date: 2022-04-01
Volume: 62
Issue: 4
Page Range: Unknown
Description:
COMPASS addressed several physical processes that may explain the behaviour of important phenomena. This paper presents results related to the main fields of COMPASS research obtained in the recent two years, including studies of turbulence, L-H transition, plasma material interaction, runaway electron, and disruption physics: Tomographic reconstruction of the edge/SOL turbulence observed by a fast visible camera allowed to visualize turbulent structures without perturbing the plasma. Dependence of the power threshold on the X-point height was studied and related role of radial electric field in the edge/SOL plasma was identified. The effect of high-field-side error fields on the L-H transition was investigated in order to assess the influence of the central solenoid misalignment and the possibility to compensate these error fields by low-field-side coils. Results of fast measurements of electron temperature during ELMs show the ELM peak values at the divertor are around 80% of the initial temperature at the pedestal. Liquid metals were used for the first time as plasma facing material in ELMy H-mode in the tokamak divertor. Good power handling capability was observed for heat fluxes up to 12 MW m-2 and no direct droplet ejection was observed. Partial detachment regime was achieved by impurity seeding in the divertor. The evolution of the heat flux footprint at the outer target was studied. Runaway electrons were studied using new unique systems - impact calorimetry, carbon pellet injection technique, wide variety of magnetic perturbations. Radial feedback control was imposed on the beam. Forces during plasma disruptions were monitored by a number of new diagnostics for vacuum vessel (VV) motion in order to contribute to the scaling laws of sideways disruption forces for ITER. Current flows towards the divertor tiles, incl. possible short-circuiting through PFCs, were investigated during the VDE experiments. The results support ATEC model and improve understanding of disruption loads.
Open Access: Yes
Progress in diagnostics of the COMPASS tokamak
V. Weinzettl
J. Seidl
M. Peterka
R. Paprok
A. Podolnik
P. Vondráček
T. Krizsanóczi
M. Stano
M. Dimitrova
P. Bilková
N. Vianello
M. Sos
J. Varju
M. Tomes
M. Varavin
M. Hron
J. Zajac
F. Zacek
M. Berta
T. Markovic
A. Devitre
M. Komm
O. Grover
P. Hacek
E. Gauthier
E. Matveeva
J. Mlynar
D. Naydenkova
K. Kovarik
M. Rabinski
J. Adamek
J. Stöckel
J. Horacek
R. Pánek
R. Dejarnac
J. Havlicek
A. Havranek
R. Gomes
M. Vlainic
A. Silva
S. Zoletnik
P. Böhm
J. Cavalier
O. Ficker
G. Anda
M. Imrišek
D. Dunai
D. Réfy
T. Pereira
Tsv Popov
D. Sarychev
G. P. Ermak
J. Zebrowski
M. Jakubowski
J. Krbec
S. Nanobashvili
M. Spolaore
O. Bogár
K. Mitošinková
K. Malinowski
J. P. Gunn
D. Fridrich
Publication Name: Journal of Instrumentation
Publication Date: 2017-12-07
Volume: 12
Issue: 12
Page Range: Unknown
Description:
The COMPASS tokamak at IPP Prague is a small-size device with an ITER-relevant plasma geometry and operating in both the Ohmic as well as neutral beam assisted H-modes since 2012. A basic set of diagnostics installed at the beginning of the COMPASS operation has been gradually broadened in type of diagnostics, extended in number of detectors and collected channels and improved by an increased data acquisition speed. In recent years, a significant progress in diagnostic development has been motivated by the improved COMPASS plasma performance and broadening of its scientific programme (L-H transition and pedestal scaling studies, magnetic perturbations, runaway electron control and mitigation, plasma-surface interaction and corresponding heat fluxes, Alfvenic and edge localized mode observations, disruptions, etc.). In this contribution, we describe major upgrades of a broad spectrum of the COMPASS diagnostics and discuss their potential for physical studies. In particular, scrape-off layer plasma diagnostics will be represented by a new concept for microsecond electron temperature and heat flux measurements - we introduce a new set of divertor Langmuir and ball-pen probe arrays, newly constructed probe heads for reciprocating manipulators as well as several types of standalone probes. Among optical tools, an upgraded high-resolution edge Thomson scattering diagnostic for pedestal studies and a set of new visible light and infrared (plasma-surface interaction investigations) cameras will be described. Particle and beam diagnostics will be covered by a neutral particle analyzer, diagnostics on a lithium beam, Cherenkov detectors (for a direct detection of runaway electrons) and neutron detectors. We also present new modifications of the microwave reflectometer for fast edge density profile measurements.
Open Access: Yes
Contribution to the multi-machine pedestal scaling from the COMPASS tokamak
Publication Name: Nuclear Fusion
Publication Date: 2017-04-06
Volume: 57
Issue: 5
Page Range: Unknown
Description:
First systematic measurements of pedestal structure during Ohmic and NBI-assisted Type I ELMy H-modes were performed on the COMPASS tokamak in two dedicated experimental campaigns during 2015 and 2016. By adjusting the NBI heating and a toroidal magnetic field, the electron pedestal temperature was increased from 200 eV up to 300 eV, which allowed reaching pedestal collisionality v∗ ped < 1 at q95 ∼3. COMPASS has approached conditions for the Identity experiment done at JET and DIII-D, complementing the range of scanned p∗ ped . The pedestal pressure was successfully reproduced by the EPED model. The dependence of pedestal pressure width on v∗ ped and βpol ped is discussed.
Open Access: Yes
