SIW Shah1, C. Silva1, H. Fernandes1 APPLAuSE (2014

Reflectometry in TOKAMAK Plasmas
S. I. W. Shah1, C. Silva1, H. Fernandes1
APPLAuSE (2014 – 2017)
1Instituto
de Plasmas e Fusão Nuclear (IPFN), Instituto Superior Técnico (IST) , Lisbon, Portugal
Exp. Results – Random HFS Profiles
Motivation
Exp. Results – ELM Phases
Evolution
Densityobtained
Profiles directly
during an
ELM
event at HFSData
for # at
30548
Density ofProfiles
from
Reflectometry
HFS for # 30548
4
4
5
t = 2.7300s (precursor)
t = 2.7311s (collapse)
t = 2.7321s (recovery)
5
t = 2.7300s (precursor) t = 2.2990s
t = 2.7311s (collapse)
t = 3.4991s
t = 2.7321s (recovery)
t = 2.2990s
t = 3.4991s
t = 3.7990s
3.5 4.5
Evolution
of Density
Profiles
during
an ELM
event
at LFS for #Data
30548
Density
Profiles
obtained
directly
from
Reflectometry
at LFS for # 30548
3.5
4
4
3
3
3.5
3.5
2.5
2.5
1.5
19
ne [10
2.5
-3
2
ne [10
ne [10
19
2
m ]
-3
-3
19
m ]
-3
3
m ]
3
m ]
ne [10
19
Mostly By P. Gohil, PPCF 44 A37 2001
1.5
2
1
1
1
0
1.04
1.06
1.08
1.1
1.12
1.14
R [m]
1.1 (precursor)
t = 3.8310s
1.15
1.16
1.18
1.2
0
1.22
Basic Principles
1.2
1.25
5
1.3
2.25
0
2.04
2.06
2.08
2.1
2.12
2.14
R [m]
2.16
2.18(precursor)
2.2
t = 3.8310s
t = 3.8321s (collapse)
t = 3.8331s (recovery)
-3
19
-3
m ]
3
m ]
2.5
ne [10
19
2.2
3.5
3
2.5
ne [10
2.15
4
t = 2.2590s
t = 2.3091s
t = 2.3590s
t = 2.4091s
3.5
2.5
2
2
2
1.5
1.5
19
-3
m ]
2
2.1
4.5
3
2.5
2.05
Evolution of Density Profiles during an ELM event at LFS for # 30548
Evolution of Density Profiles at LFS for # 30548 during L-H Transition
4
t = 2.2590s
t = 2.3091s
t = 2.3590s
t = 2.4091s
2
R [m]
Exp. Results – LH Transition
4.5
0.5
R [m]
t = 3.8321s (collapse)
t = 3.8331s (recovery)
3
1
Evolution of Density Profiles during an ELM event at HFS for # 30548
0
5
1.05
Evolution of Density Profiles at HFS for # 30548 during L-H Transition
1.5
0.5
0.5
Microwave reflectometry has both high temporal and
spatial resolutions.
2.5
2
1.5
0.5
K. Itoh, at IAEA Summary Talk 2002
t = 3.7990s
4.5
ne [10
1.5
J. Santos, PhD Thesis, 2007
Exp. Results – Random LFS Profiles
1
1.5
1
1
0.5
0.5
1
0
1.04
Reflectometry Data from ASDEX Upgrade
o
o
o
o
0.5
1.06
1.08
1.1
R [m]
1.12
1.14
0
2.06
1.16
1.1
1.15
0.5
1.2
1.25
0
1.3
R [m]
4.5
2.12
2.14
2.16
2.18
2.2
2.22
2.24
Future Work
Discharge # 30548
Frequency range: 16-40GHz
Temporal resolution: 1ms
Spatial resolution: <5mm
5
2.1
R [m]
Density Profiles obtained directly from Reflectometry Data at LFS for # 30548
0
1.05
2.08
Evolution of Density Profiles at HFS for # 30548 during L-H Transition
t = 2.2990s
t = 3.4991s
t = 3.7990s
2
2.05
2.1
2.15
2.2
2.25
R [m]
Evolution of Density Profiles at LFS for # 30548 during L-H Transition
3
4
2.5
o Exploring high potentialities of the FM-CW
broadband reflectometry system
o Dynamics of density pedestal perturbations
associated with ELMs and edge harmonic
oscillations (EHOs)
o Physics of transport barriers in burning plasmas
o Physics of the microturbulence in tokamak
plasmas and its relationship to anomalous
transport
o Plasma position and shape control
References
3
3.5
2
1) W. Suttrop et al. PPCF 42 A1 2000
2) M.E. Manso et al. PPCF 43 A73 2001
3) M. Becoulet et al. PPCF 45 A93 2003
4) S. Heuraux et al. Rev Sci Inst 74 3 1501 2003
5) I. Nunes et al, Nucl Fusion 45 6 502 2005
6) A. Silva, PhD thesis UTL Lisboa 2007
7) J. Santos et al. IRW8 Russia 2007
8) S. Hacquin et al. PPCF 49 9 1371, 2007
9) K.H. Burrel et al. Nucl. Fusion, 49 085024 2009
10) Z.X. Liu et al. Plas Phys Control Fus 54 085005 2012
2.5
-3
m ]
2
-3
m ]
2.5
19
19
1.5
ne [10
ne [10
19
-3
m ]
3
ne [10
1
2
1.5
1
0.5
1.5
Acknowledgements
0.5
0
1
2.45
2.4
0
2.2
2.35
0.5
2.1
2.3
2.15
2.35
2.25
02.2
2.04
2.05
2.25
2.3
t [s]
2
1.05
2.06
Poster template by ResearchPosters.co.za
1.1
2.08
1.15
2.1
2.12
1.2
2.14
R [m] R [m]
1.25
2.16
1.3
2.18
1.4
1.35
2.2
2.22
2.2
2.4
2.45
2.24
2.25
R [m]
t [s]
This work has been carried out in Instituto Superior
Técnico (IST) under Advanced Program in PLAsma
Science and Engineering (APPLAuSE) and has
received financial support from Fundação para a
Ciência e a Tecnologia (FCT).
2.22