active beam spectroscopy in hot fusion plasmas (beam emission spectroscopy and mse)
DESCRIPTION
Active Beam Spectroscopy in Hot Fusion Plasmas (Beam Emission Spectroscopy and MSE). Manfred von Hellermann FOM Institute for Plasma Physics Rijnhuizen, NL. Seminar-III Institute for Plasma Physics Academy of Sciences Hefei, China May, 7, 2007. Acknowledgement: - PowerPoint PPT PresentationTRANSCRIPT
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Active Beam Spectroscopy in Hot Fusion Plasmas
(Beam Emission Spectroscopy and MSE)
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-IIIInstitute for Plasma Physics
Academy of SciencesHefei, ChinaMay, 7, 2007
Trilateral Eureg io Cluster
FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M
TEC
M. von Hellermann
Combination of CXRS and BES:
common line of sight and beam geometry
Beam Emission Spectroscopy as tool for absolute calibrationof CXRS signals
eEDeED )()( *
)()()()( ,*00 EDTDEDTD
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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
First observation of a CXRS D-alpha spectrum on JET 1986Alain Boileau, PhD Thesis, University of Montreal 1988
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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
W.Mandl 1991, first fully modelled Balmer-alpha-CX and beam spectrum
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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
Beam Emission Rate vs. collision energy and electron densityc.f. ADAS file ADF312
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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
Beam Emission Rate versus collision energy and ion temperatureADAS file ADF312
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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
Beam Emission rate versus collision energy and C+6 concentration
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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
local concentration measurements reduced to a line ratio measurement
ds)E(nQn4
1)E(I bBESebes
Combination of CXRSand BES enablesdeduction of ion densities without absolute calibrationand measurement of optical transmission
Combination of CXRSand BES enablesdeduction of ion densities without absolute calibrationand measurement of optical transmission
ds)E(nQn4
1)E(I bCXRSzCXRS
CXBES
BESCX
e
z
QI
QI
n
n
Note: Atomic rates Q depend on energy, electron and ion densities and temperatures
Trilateral Eureg io Cluster
FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M
TEC
M. von Hellermann
mea
sure
d be
am d
ensi
ty(1
0^14
m^-
2)
.1.51.00.50.0
y=xline of best fit (y=0.73x)
40419403924039040387
1.2
0.9
0.6
0.3
0.0
calculated beam density(10^14m^-2)
Comparison of beam line-densities derived from beam stopping and beam emission respectively
1,
,exp)0(k
kstope
kzebb n
nndsnn
1,
,exp)0(k
kstope
kzebb n
nndsnn
eBES
BESb nEQ
EIdsEn
)(
)(4)(
Trilateral Eureg io Cluster
FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M
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M. von Hellermann
TEXTOR comparison of beam line-densities from beam stopping and beam emission respectively
TEXTOR NBI energy scan (21keV<E<46keV)
y = 0.7x
R2 = 0.9737
0.00E+00
2.00E+13
4.00E+13
6.00E+13
8.00E+13
1.00E+14
1.20E+14
0.00E+00
2.00E+13
4.00E+13
6.00E+13
8.00E+13
1.00E+14
1.20E+14
1.40E+14
1.60E+14
n-beam(att)
n-b
eam
(BE
S)
Trilateral Eureg io Cluster
FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M
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M. von Hellermann
Questions:
Is the deviation between beam-stopping beamdensities and beam-emission deduced beam densities due to:
a) Geometry factors, alignment, beam dimensions ?b)Errors in beam stopping cross-sections ?c) Errors in beam emission rates ?d)Do we need to establish further experiments ?e) Do we need to review atomic physics ?
Trilateral Eureg io Cluster
FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M
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M. von Hellermann
D-alpha-BES and D-alpha-CXRS Robert Wolf 1993
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M. von Hellermann
Ratio of Pi-over-Sigma Group in JET MSE spectrum
2
2
cos1
sin
I
I
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M. von Hellermann
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M. von Hellermann
Toroidal direction
Poloidal direction
DNB
M.von Hellermann et al., ITER report December 2003
D-alpha-edge
D-alpha-CX
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M. von Hellermann
2
2
cos1
sin
I
IP
0RB
rBq
pol
tor
0
0 tanRq
ra
00 1
2tancot)(
P
Pa
R
aq
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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
MSE ratio for U-ports 2 &3
U-port 2
U-port 3
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M. von Hellermann
2
220
0 12
3
tor
poltorbeamL B
BBv
chae
The most accurate data extracted from the beam spectrum is the Lorentz split representing the total magnetic field as local measurement.This offers a promising back-up to pick-up coils and magnetic field measurements making use of electronic integrators.Expected accuracies are better than 0.5%
Trilateral Eureg io Cluster
FO M -Instituut vo o r PlasmafysicaA sso ciatio n EU RATO M -FO M
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M. von Hellermann
R.C.Wolf, L-G Eriksson, M von Hellermann, R.König, W.Mandl, F.PorcelliNuclear Fusion, 33, 1835(1993), JET-P(93)24