C. Biedermann

Max Planck Institute for Plasma Physics - Greifswald

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G. Kocsis

Centre for Energy Research

M. Jakubowski

Max Planck Institute for Plasma Physics - Greifswald

T. S. Pedersen

Max Planck Institute for Plasma Physics - Greifswald

S. Bozhenkov

Max Planck Institute for Plasma Physics - Greifswald

T. Szepesi

Wigner Research Centre for Physics

R. König

Max Planck Institute for Plasma Physics - Greifswald

G. A. Wurden

Los Alamos National Laboratory

M. Krychowiak

Max Planck Institute for Plasma Physics - Greifswald

M. Otte

Max Planck Institute for Plasma Physics - Greifswald

O. Schmitz

University of Wisconsin–Madison

Cooperative Institutions

Max Planck Institute for Plasma Physics

578

Max Planck Society

523

Max Planck Institute for Plasma Physics - Greifswald

466

Princeton Plasma Physics Laboratory

154

Forschungszentrum Jülich

148

Culham Science Centre

146

National Institute for Fusion Science

125

CEA Cadarache

123

Oak Ridge National Laboratory

122

Royal Military Academy

106

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Validating the ASCOT modelling of NBI fast ions in Wendelstein 7-X

S. Äkäslompolo Adnan Ali J. Baldzuhn C. Biedermann S. Bozhenkov

Wendelstein 7-X

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Photoion Auger-electron coincidence measurements near threshold

J. C. Levin C. Biedermann N. Keller L. Liljeby R. T. Short

The vacancy cascade which fills an atomic inner-shell hole is a complex process which can proceed by a variety of paths, often resulting in a broad distribution of photoion charge states. We have measured simplified argon photoion charge distributions by requiring a coincidence with a K-LL or K-LM Auger electron, following K excitation with synchrotron radiation, as a function of photon energy, and report here in detail the argon charge distributions coincident with K-L{sub 1}L{sub 23} Auger electrons. The distributions exhibit a much more pronounced photon-energy dependence than do the more complicated non-coincident spectra. Resonant excitation of the K electron to np levels, shakeoff of these np electrons by subsequent decay processes, double-Auger decay, and recapture of the K photoelectron through postcollision interaction occur with significant probability. 17 refs.

Auger effect

Auger electron spectroscopy

Autoionization

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Edge Plasma Properties from the first Island Divertor Campaign at Wendelstein 7-X

M. Otte R. König M. Krychowiak M. Jakubowski Y. Feng

Wendelstein 7-X

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Observation of anomalous impurity transport during low-density experiments in W7-X with laser blow-off injections of iron

Nuclear Fusion (2019)

B. Geiger T. Wegner C. D. Beidler R. Burhenn B. Buttenschön

The transport of heavy impurities has been investigated at the Wendelstein 7-X stellarator during core electron root confinement (CERC) experiments. Iron atoms were injected via the laser blow-off technique and analyzed by VUV and x-ray spectrometers. The injected amount of iron does not change the global plasma parameters but yields strong enough line radiation for detailed studies based on the impurity transport code STRAHL. The latter is supplied with neo-classical diffusion and convection profiles from the drift kinetic equation solver (DKES) and has been embedded into a least-squares fit that searches for additional anomalous diffusion and convection profiles, required to explain the measurements. While the resulting convection velocities agree within uncertainties with neo-classical theory, the anomalous diffusion profile exhibits values more than two orders of magnitude larger than the neo-classical one. This significant level of anomalous transport is possibly explained by turbulence. The high ratio and flat density profile present during the experiment yield low thresholds for temperature gradient driven modes that are expected off-axis where the obtained diffusion profile peaks.

Large Helical Device

Wendelstein 7-X

10.1088/1741-4326/aaff71

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Citations (49)

Study of the convoy electron production from solids with hydrogenic Ni-ions

Acta physica Hungarica (1989)

J. Kemmler O. Heil H. Rothard K. Kroneberger S. Lencinas

We have measured the target thickness dependent convoy electron yieldsY c from hydrogenic Ni27+, Ni28+ (15.6 MeV/u) which is discussed in the framework of an extended model for ELC and ECC in solids considering also contributions from excited states. To understand the target thickness dependent evolution in the case of incident Ni27+ it must be assumed that convoy electrons produced by ELC arise mainly from excited states. The mean transport length λ e for convoy electrons for light projectile ions is equal to the attenuation length of isotachic free electrons λ e , whereas for the heavy ions an enhanced transport length λ e ≫ λ e must be introduced.

10.1007/bf03156056

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Reactions of cooled ions with cold electrons in CRYRING

Acta Physica Polonica B (1996)

R. Schuch S. Asp C. Biedermann D. R. DeWitt Hui Gao

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X ray and EUV spectroscopic measurements of highly charged tungsten ions relevant to fusion plasmas

Journal of Physics Conference Series (2007)

R. Radtke C. Biedermann P. Mandelbaum J.L. Schwob

Using high-resolution x ray and extreme ultraviolet (EUV) spectrometry, the line emission of W28+ - W50+ ions was measured at the Berlin Electron Beam Ion Trap (EBIT). Our study encompasses a wide range of wavelengths (5-800 Å) and includes the observation of electric and magnetic dipole lines. The results of our measurements are compared with predicted transition wavelengths from ab initioatomic structure calculations.

Extreme Ultraviolet Lithography

Extreme ultraviolet

10.1088/1742-6596/58/1/019

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Citations (30)

Line ratios and wavelengths of helium-like argon n =2 satellite transitions and resonance lines

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2003)

C. Biedermann R. Radtke K. B. Fournier

Line (geometry)

10.1016/s0168-583x(02)01973-0

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Citations (7)