ECRIS2010 - List of Authors (Stalder, M.)

Paper

Title

Page

Neutralisation of Accelerated Ions and Detection of Resulting Neutrals

49

T. Peleikis, L. Panitzsch, M. Stalder
IEAP, Kiel, Germany

At the University of Kiel, the Department of Experimental and Applied Physics is running an ECR ion source in order to, amongst others, calibrate space instruments designed to measure solar wind properties and suprathermal particles. The ion source is able to produce medium to highly charged ions which are then accelerated by an electrostatic field up to 400keV per charge. In order to extend the particle spectrum from ions to neutral atoms we are planning to install a device for the beam particle neutralisation. It will be used to calibrate instruments which measure neutral particles. This device will be located downstream from the sector magnet and the acceleration-stage. The sector magnet separates the ions by their m/q ratio. This way the type and the energy of the ions can be determined before the neutralisation. Neutralisation can be achieved either by passing the ions through a thin carbon foil (thickness ~88nm) or through a gastarget (thickness ~6mm, pressure ~0.1mbar) where charge-exchange occur. The remaining ions behind the neutraliser will be suppressed by an electrostatic separator. Both methods will alter the beam properties and lead to a divergence in energy and an angular spread of the beam. Simulations regarding these effects will be discussed. The overall progress on this project will be presented.

Poster MOPOT004 [1.776 MB]

WECOBK04

Preliminary Results of Spatially Resolved ECR Ion Beam Profile Investigations

188

L. Panitzsch, M. Stalder, R.F. Wimmer-Schweingruber
IEAP, Kiel, Germany

The Department of Experimental and Applied Physics (IEAP) at the University of Kiel (CAU Kiel) is establishing a solar wind laboratory for the calibration of space instrumentation. The main item of this facility is a 11GHz (Plateau) ECR ion source. It can be operated at two different radial magnetic confinements, using a set of permanent magnets in either hexapole or dodekapole arrangement. While beam focussing by moving the extraction along the beam line to match the ion beam into the analysing magnet is well known, little is known about beam steering by moving the extraction in the plane perpendicular to the beam line. For the hexapole-configuration we will present our results about the feasibility of ion beam focussing and steering using a 3D-movable extraction. The beam profiles of these measurements will be recorded in comparatively high resolution with a Faraday cup array (see paper doi: 10.|10|63/1.3246787). This method will be shortly introduced within this talk, as well.

Slides WECOBK04 [13.317 MB]

THCOAK04

Modeling ECRIS Using a 1D Multifluid Code

200

M. Stalder
IEAP, Kiel, Germany

We developed a one-dimensional (1D) multifluid code to simulate the production and the transport of multiple ion species in an electron cyclotron ion source (ECRIS). The ion species are assumed to be highly collisionally coupled. Each ion species is treated as a independent fluid. This allows us to study the influence of the ion temperature. The temperature is assumed to be equal for all charge states and in the whole ECRIS. As starting parameters we choose a hot magnetically trapped electron distribution, a cold electron distribution trapped by the plasma potential an the neutral density. Modeling the interaction of the different fluids led to a new understanding of the influence of the electrostatic potential that balances the pressure gradient of the ions species in the ECRIS. The highest charge states are not confined strongest as in the over barrier model but expelled in comparison to lower charge states. It can be shown that the relative velocity v of the treated fluids scales as v ~ T^5/3 with the ion temperature. First results of the simulations are presented together with a discussion of the modeling approach for the multifluid case and its theoretical predictions. As a baseline for our simulations we mainly used the results of the 1D GEM ECRIS fluid simulations.

Slides THCOAK04 [2.268 MB]

Paper	Title	Page
MOPOT004	Neutralisation of Accelerated Ions and Detection of Resulting Neutrals	49
	T. Peleikis, L. Panitzsch, M. Stalder IEAP, Kiel, Germany
	At the University of Kiel, the Department of Experimental and Applied Physics is running an ECR ion source in order to, amongst others, calibrate space instruments designed to measure solar wind properties and suprathermal particles. The ion source is able to produce medium to highly charged ions which are then accelerated by an electrostatic field up to 400keV per charge. In order to extend the particle spectrum from ions to neutral atoms we are planning to install a device for the beam particle neutralisation. It will be used to calibrate instruments which measure neutral particles. This device will be located downstream from the sector magnet and the acceleration-stage. The sector magnet separates the ions by their m/q ratio. This way the type and the energy of the ions can be determined before the neutralisation. Neutralisation can be achieved either by passing the ions through a thin carbon foil (thickness ~88nm) or through a gastarget (thickness ~6mm, pressure ~0.1mbar) where charge-exchange occur. The remaining ions behind the neutraliser will be suppressed by an electrostatic separator. Both methods will alter the beam properties and lead to a divergence in energy and an angular spread of the beam. Simulations regarding these effects will be discussed. The overall progress on this project will be presented.
	Poster MOPOT004 [1.776 MB]

WECOBK04	Preliminary Results of Spatially Resolved ECR Ion Beam Profile Investigations	188
	L. Panitzsch, M. Stalder, R.F. Wimmer-Schweingruber IEAP, Kiel, Germany
	The Department of Experimental and Applied Physics (IEAP) at the University of Kiel (CAU Kiel) is establishing a solar wind laboratory for the calibration of space instrumentation. The main item of this facility is a 11GHz (Plateau) ECR ion source. It can be operated at two different radial magnetic confinements, using a set of permanent magnets in either hexapole or dodekapole arrangement. While beam focussing by moving the extraction along the beam line to match the ion beam into the analysing magnet is well known, little is known about beam steering by moving the extraction in the plane perpendicular to the beam line. For the hexapole-configuration we will present our results about the feasibility of ion beam focussing and steering using a 3D-movable extraction. The beam profiles of these measurements will be recorded in comparatively high resolution with a Faraday cup array (see paper doi: 10.\|10\|63/1.3246787). This method will be shortly introduced within this talk, as well.
	Slides WECOBK04 [13.317 MB]

THCOAK04	Modeling ECRIS Using a 1D Multifluid Code	200
	M. Stalder IEAP, Kiel, Germany
	We developed a one-dimensional (1D) multifluid code to simulate the production and the transport of multiple ion species in an electron cyclotron ion source (ECRIS). The ion species are assumed to be highly collisionally coupled. Each ion species is treated as a independent fluid. This allows us to study the influence of the ion temperature. The temperature is assumed to be equal for all charge states and in the whole ECRIS. As starting parameters we choose a hot magnetically trapped electron distribution, a cold electron distribution trapped by the plasma potential an the neutral density. Modeling the interaction of the different fluids led to a new understanding of the influence of the electrostatic potential that balances the pressure gradient of the ions species in the ECRIS. The highest charge states are not confined strongest as in the over barrier model but expelled in comparison to lower charge states. It can be shown that the relative velocity v of the treated fluids scales as v ~ T^5/3 with the ion temperature. First results of the simulations are presented together with a discussion of the modeling approach for the multifluid case and its theoretical predictions. As a baseline for our simulations we mainly used the results of the 1D GEM ECRIS fluid simulations.
	Slides THCOAK04 [2.268 MB]