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Trilateral Euregio Cluster
TEC
Active Beam Spectroscopy
(Evaluation of Data and Supporting
Software)
Manfred von Hellermann
FOM Institute for Plasma Physics Rijnhuizen, NL
Seminar-II
Institute for Plasma Physics
Academy of Sciences
Hefei, China
May, 6, 2007
Acknowledgement:
CXRS groups at JET, TEXTOR, Tore Supra , ASDEX-UG and
members of the ITPA expert group on Active Beam Spectroscopy
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
Outline
Basic concepts of quantitative spectroscopy
 Spectral Analysis code KS4FIT (
KS4FIT_JAVA, CXSFIT)
 CHEAP
 Simulation of CXRS and BES Spectra
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
raw data
wavelength calibration
identification of spectral features
absolute calibration
extraction of intensity
width and position
localisation +
magnetic mapping
local donor density
local impurity density
consistency checks
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
TEC
Trilateral Euregio Cluster
TEC
CX spectral fitting
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
M. von Hellermann
Trilateral Euregio Cluster
Spectral Analysis Code KS4FIT
developed at JET ( 1986 to 1999)
The KS4FIT concept:
Approximation of observed spectra by
Active (beam induced) and non-active
features. Active features may be Gaussianshaped or modelled synthetic spectra
Atomic modelling of each feature to achieve
a) best possible initial estimates for nonlinear least square routine
b) unique identification of each component
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
TEC
Trilateral Euregio Cluster
TEC
Multi-machine (and multi spectrometer) access:
JET
TEXTOR
Tore Supra
Wega
ASDEX-UG
Data input:
Raw Data
Web Umbrella
MDS plus
Local Files
NetCDF
M. von Hellermann
Data output:
Processed Data
U-file
Local Files
JET-PPF
NetCDF
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Local Files:
Geometry
Calibration
Dispersion
Instrument Function
Trilateral Euregio Cluster
TEC
Technical aspects:
Spectral Fit code available on Linux platform presently 3 different versions
coexist:
KS4FIT on JET ( Fortran only)
CXSFIT on JET, ASDEX-Upgrade, KS4FIt Fortran core with interactive IDL
control shell, to be distributed as ADAS package
KS4FIT_JAVA on TEXTOR, W7-X, Tore-Supra and JET
KS4FIT Fortran core with JAVA shell
Local output formats are machine specific:
PPF (JET), U-File (TEXTOR), Shot-File (AUG), MDS-Plus possible
Local geometry, calibration, dispersion and instrument function files
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
Universal physics oriented features:
Standard setting files for the main low-Z CX transitions
a)
b)
c)
d)
e)
f)
g)
h)
i)
Carbon
Helium
Beryllium
Neon
Argon
Nitrogen
Oxygen
Hydrogen, Deuterium, Tritium
And twin CX spectra
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
KS4FIT
features
M. von Hellermann
a) Physics wavelength units
b) Physics descriptions of components
c) Constant parameters
d) Coupled parameters
e) Synthetic pedestal shapes
f) Parameter estimate optimisation
1) adjacent tracks
2) previous frames
3) pcx approximation
4) amplitude updates
5) input from other CX spectra
h) Suppressed components scenario
i) Parameter constraints
j) Documentation of settings
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
TEC
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
Schematic presentation of PCX
emission process.
The neutral density profile is the least known
ingredient of the model.
Pragmatic reconstruction of
PCX feature by ACX close to
separatrix
‘Modelling of Passive Charge Exchange Emission
and Neutral Background Density Deductions in JET’
M. Tunklev, P. Breger, K. Günther, M. von Hellermann, R. König, M. O’Mullane
and K-D. Zastrow
Plasma Physics and Controlled Fusion’, 41,985-1024(1999)
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
Pragmatic treatment of non-gaussian PCX feature
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
TEC
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
He-beam
injection
at JET
1991
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
CX nitrogen spectrum at JET
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
JET CVI spectrum in the presence of Argon ( Radiation cooling)
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
Role of edge lines on spectral wings
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
TEXTOR hydrogen scan experiment
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
radiance (10^13 photons/cm ^2/sr^/s/Å)
2.0
#42676 R:3.35 m t: 12.52 s
1.5
beam emis s ion s pectrum
1.0
de ute rium CX
tritium CX
0.5
DT pas s ive CX
0.0
6520
6540
6560
6580
wavelength(Å)
JET DT pulse
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
6600
6620
Trilateral Euregio Cluster
TEC
CHEAP
Charge Exchange Analysis Package
Main function:
a) Mapping of plasma parameters on flux coordinates
b) Self consistent calculation of local impurity densities
from CX intensities,
atomic emission rates and local beam densities
c) Beam-target interaction physics
d) Global consistency checks
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
CHEAP continued
CHEAP exists presently in 3 versions:
a) At JET: LINUX , Fortran 77 and
local copies of ADAS files
b) At TEXTOR and Tore Supra: Linux, Matlab
data input routines and MEX fortran files,
local copies of ADAS files
c) At ASDEX: Linux, IDL
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
Thermal energy
3
Wthermal   (p ion  p electron)dV
2
Ion pressure
pion (  r / a)  n ion ()  Tion ()
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
JET DT High Fusion Power pulse #42976
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
TEC
Trilateral Euregio Cluster
TEC
Plasma dilution
nd
nz
d
 1   Zz
ne
ne
z 1
Error in dilution factor
d 1  d c



d
d
c
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
B
ne
nz
Te
Ti
W
ne
nz
z
Wth
nfast
vcrit
tslow
Wfast
Ythth
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
TEC
Eb Pb
ADAS
Trilateral Euregio Cluster
TEC
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
W-dia, JET Experimental Campaign 1997
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
Mark II, NBI only
+ 40%
+ 20%
3
2
1
0
0
RWTK/ K- DZ 97
predic ted 2.5 MeV (10 16/sec)
4
1
2
3
16
measured 2.5 MeV (10 /sec)
Ralf König 1997
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
4

Trilateral Euregio Cluster
TEC
M ark II, NBI only
E rror o f predict ed 2. 5 M eV n eutron s (%)
80
60
40
20
0
-20
0
20
40
th-th/(th-th+ beam-th) (%)
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
60

Trilateral Euregio Cluster
TEC
Simulation of Spectra
Creation of synthetic spectra based on plasma
environment and atomic data.
 Active features (thermal and fast ions)
 Passive features (continuum, edge lines, PCX)
 Sensitivity analysis for parameter retrieval
 Optimization of instruments
 Optimization of neutral beam specification
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
MATLAB simulation package includes presently:
1) ITER
2) JET
3) TEXTOR
4) ASDEX
5) Tore Supra
6) W7-X
7) HL-2A
8) HT-7
9) EAST
10) SST
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
TEC
Simulation Structure:
1) Use CAD data for geometry
a) first-mirror coordinates
b) DNB injection coordinates
c) Torus geometry
2) Use DNB specifications
3) Modelling of periscope imaging properties
4) Use Spectrometer and CCD specifications
5) CHEAP modelling of neutral beam stopping (ADAS)
6) CHEAP modelling of DNB excited population (ADAS)
7) CXRS and BES emission rates (ADAS)
8) Modelling of q-profile and pitch angle
9) Modelling of continuum radiation
10) Modelling of neutral density and PCX emissivity
11)Creation of Non-Thermal Synthetic spectra
12) Modelling of DNB modulation effects
13) Assessment of noise performance
14)Assessment of parameter errors
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica
Trilateral Euregio Cluster
Summary remarks
Three main tools for the evaluation of active spectra have
TEC
been developed
Key ingredients are advanced atomic modelling of beam
plasma interaction processes
The modelling includes also background spectral features
such as free-free continuum radiation and passive line
emission at the plasma edge
A comprehensive documentation of background lines allows
the analysis of complex spectra
Non-thermal features ( slowing-down etc.) are included
M. von Hellermann
Association EURATOM-FOM
FOM-Instituut voor Plasmafysica