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Active Beam Spectroscopy (Evaluation of Data and Supporting
Software)
Acknowledgement:CXRS groups at JET, TEXTOR, Tore Supra , ASDEX-UG andmembers of the ITPA expert group on Active Beam Spectroscopy
Manfred von HellermannFOM Institute for Plasma Physics Rijnhuizen, NL
Seminar-IIInstitute for Plasma Physics
Academy of SciencesHefei, ChinaMay, 6, 2007
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M. von Hellermann
Outline
Basic concepts of quantitative spectroscopy
Spectral Analysis code KS4FIT ( KS4FIT_JAVA, CXSFIT)
CHEAP
Simulation of CXRS and BES Spectra
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M. von Hellermann
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M. von Hellermann
localisation +magnetic mapping
local donor density
local impurity density
extraction of intensitywidth and position
absolute calibration
wavelength calibration
identification of spectral features
raw data
consistency checks
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FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M
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M. von Hellermann
CX spectral fitting
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M. von Hellermann
Spectral Analysis Code KS4FITdeveloped at JET ( 1986 to 1999)The KS4FIT concept:Approximation of observed spectra by Active (beam induced) and non-active features. Active features may be Gaussian-shaped or modelled synthetic spectraAtomic modelling of each feature to achievea) best possible initial estimates for non- linear least square routineb) unique identification of each component
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M. von Hellermann
Multi-machine (and multi spectrometer) access:
JETTEXTORTore SupraWegaASDEX-UG
Data input:Raw Data
Web UmbrellaMDS plusLocal FilesNetCDF
Data output:Processed Data
U-fileLocal FilesJET-PPFNetCDF
Local Files:
GeometryCalibrationDispersionInstrument Function
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M. von Hellermann
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 JETKS4FIT 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
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M. von Hellermann
Universal physics oriented features:
Standard setting files for the main low-Z CX transitions
a) Carbonb) Heliumc) Berylliumd) Neone) Argonf) Nitrogeng) Oxygenh) Hydrogen, Deuterium, Tritiumi) And twin CX spectra
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M. von Hellermann
a) Physics wavelength unitsb) Physics descriptions of componentsc) Constant parametersd) Coupled parameterse) Synthetic pedestal shapesf) Parameter estimate optimisation 1) adjacent tracks 2) previous frames 3) pcx approximation 4) amplitude updates 5) input from other CX spectrah) Suppressed components scenarioi) Parameter constraintsj) Documentation of settings
KS4FITfeatures
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M. von Hellermann
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M. von Hellermann
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M. von Hellermann
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M. von Hellermann
Schematic presentation of PCXemission process.The neutral density profile is the least knowningredient of the model.
Pragmatic reconstruction ofPCX feature by ACX close toseparatrix‘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. ZastrowPlasma Physics and Controlled Fusion’, 41,985-1024(1999)
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M. von Hellermann
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M. von Hellermann
Pragmatic treatment of non-gaussian PCX feature
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M. von Hellermann
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M. von Hellermann
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M. von Hellermann
He-beam injection at JET1991
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M. von Hellermann
CX nitrogen spectrum at JET
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M. von Hellermann
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M. von Hellermann
JET CVI spectrum in the presence of Argon ( Radiation cooling)
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M. von Hellermann
Role of edge lines on spectral wings
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M. von Hellermann
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M. von Hellermann
TEXTOR hydrogen scan experiment
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M. von Hellermann
radian
ce (10
^13 p
hoton
s/cm^
2/sr^/
s/Å)
wavelength(Å)
#42676 R:3.35 m t: 12.52 s
6520 6540 6560 6580 6600 66200.0
0.5
1.0
1.5
2.0
deuterium CXtritium CX
DT passive CX
beam emission spectrum
JET DT pulse
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M. von Hellermann
CHEAP
Charge Exchange Analysis Package
Main function:
a) Mapping of plasma parameters on flux coordinatesb) Self consistent calculation of local impurity densities from CX intensities, atomic emission rates and local beam densitiesc) Beam-target interaction physicsd) Global consistency checks
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M. von Hellermann
CHEAP continued
CHEAP exists presently in 3 versions:
a) At JET: LINUX , Fortran 77 and local copies of ADAS filesb) At TEXTOR and Tore Supra: Linux, Matlab data input routines and MEX fortran files, local copies of ADAS filesc) At ASDEX: Linux, IDL
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dV)pp(23W electronionthermal
Thermal energy
)(T)(n)a/r(p ionionion Ion pressure
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TECJET DT High Fusion Power pulse #42976
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e
z
1zz
e
d
nnZ1
nnd
cc
dd1
dd
Plasma dilution
Error in dilution factor
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FO M -Instituut voo r PlasmafysicaA ssociatio n EU RATO M -FO M
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M. von Hellermann
B ne nz Te Ti Eb PbADAS
ne
nz
Wth
nfast
vcrit
slow
Wfast
Ythth
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M. von Hellermann
W-dia, JET Experimental Campaign 1997
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M. von Hellermann
0 1 2 3 4
0
1
2
3
4
+ 2 0 %+ 4 0 %p
red
icte
d 2
.5
Me
V (
10
16
/se
c)
m e a s u r e d 2 . 5 M e V ( 1 01 6
/ s e c )
M a r k I I , N B I o n l y
RW
TK
/K
-D
Z
97
Ralf König 1997
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0 20 40 60-20
0
20
40
60
80
Erro
r of p
redict
ed 2.
5 MeV
neu
trons
(%)
th-th/(th-th+beam-th) (%)
M ark II , NBI only
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M. von Hellermann
Simulation of SpectraCreation 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
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M. von Hellermann
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
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M. von Hellermann
Simulation Structure:1) Use CAD data for geometry a) first-mirror coordinates b) DNB injection coordinates c) Torus geometry2) Use DNB specifications3) Modelling of periscope imaging properties4) Use Spectrometer and CCD specifications5) 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 angle9) Modelling of continuum radiation10) Modelling of neutral density and PCX emissivity11)Creation of Non-Thermal Synthetic spectra12) Modelling of DNB modulation effects13) Assessment of noise performance14)Assessment of parameter errors
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M. von Hellermann
Summary remarksThree main tools for the evaluation of active spectra have been developedKey ingredients are advanced atomic modelling of beam plasma interaction processesThe modelling includes also background spectral features such as free-free continuum radiation and passive line emission at the plasma edgeA comprehensive documentation of background lines allows the analysis of complex spectraNon-thermal features ( slowing-down etc.) are included