Active Beam Spectroscopy (Evaluation of Data and Supporting Software)

Trilateral Eureg io Cluster

FO M -Instituut voo r PlasmafysicaA ssociatio n EU RATO M -FO M

TEC

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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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


FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M

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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

Trilateral Eu reg io Cluster


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M. von Hellermann

CX spectral fitting


FO M -Instituu t vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M

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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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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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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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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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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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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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Pragmatic treatment of non-gaussian PCX feature



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He-beam injection at JET1991



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CX nitrogen spectrum at JET



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JET CVI spectrum in the presence of Argon ( Radiation cooling)



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Role of edge lines on spectral wings



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TEXTOR hydrogen scan experiment



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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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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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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


FO M -Instituut voo r PlasmafysicaA sso ciatio n EU RATO M -FO M

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dV)pp(23W electronionthermal

Thermal energy

)(T)(n)a/r(p ionionion Ion pressure



TECJET DT High Fusion Power pulse #42976


FO M -Instituut vo o r PlasmafysicaA ssociatio n EU RATO M -FO M

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e

z

1zz

e

d

nnZ1

nnd

cc

dd1

dd

Plasma dilution

Error in dilution factor



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B ne nz Te Ti Eb PbADAS

ne

nz

Wth

nfast

vcrit

slow

Wfast

Ythth


FO M -Instituut vo o r PlasmafysicaA ssociatio n EU RATO M -FO M

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W-dia, JET Experimental Campaign 1997



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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


FO M -Instituu t voo r PlasmafysicaA ssociatio n EU RATO M -FO M

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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


FO M -Instituu t voo r PlasmafysicaA ssociation EU RATO M -FO M

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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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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


FO M -Instituu t voo r PlasmafysicaA ssociation EU RATO M -FO M

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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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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

Documents

Active Beam Spectroscopy (Evaluation of Data and Supporting Software)