The following papers give a detailed overview about the MEFISTO system and how it is used for calibrations.

For a copy of thesis or paper, please contact us.

Publications

Plasma Sources Sci. Technol., Volume 14, pp. 692-699, 2005

Investigation of the density and temperature of electrons in a compact 2.45 GHz electron cyclotron ion source plasma by X-ray measurements

Hohl M., P. Wurz, and P. Bochsler
Physikalisches Institut, University of Bern, 3012 Bern, Switzerland

X-ray measurements of the plasma of a compact 2.45 GHz electron cyclotron resonance ion source (ECRIS) are performed to determine the temperature and density of the electrons heated resonantly in the ECRIS. The x-ray detector used to investigate the plasma consists of a small silicon (Si-PIN) photodiode to detect photons in the energy range of 1-100 keV. The detector has an energy resolution of 180 eV at 5.9 keV that allows us to record detailed x-ray spectra. Assuming two temperature electron populations, both Maxwellian distributed, the analysis of the x-ray spectra shows a temperature of about 2 keV for the hot electron fraction in addition to the population of cold electrons at less than 2 eV. The fraction of the hot electrons amounts to 1-10%. We present a description of the x-ray detector set-up as well as x-ray spectra and calculations for the temperature and density of the electrons in the ECRIS plasma.

M. Hohl, Ph.D. thesis, University of Bern, Switzerland, 2002

MEFISTO II: Design, setup, characterization and operation of an improved calibration facility for solar plasma instrumentation.

Markus Hohl and Peter Wurz
Physikalisches Institut, University of Bern, 3012 Bern, Switzerland

Review of Scientific Instruments,Vol 72, Number 2, 2001

New Calibration Facility for Solar Wind Plasma Instrumentation

Adrian Marti, Reto Schletti, Peter Wurz, and Peter Bochsler
Physikalisches Institut, University of Bern, 3012 Bern, Switzerland

Space borne analysis of the composition of the solar wind offers the unique possibility of direct measurements of material originating from the sun. For development, testing, and calibration of solar wind particle instrumentation particle beams of highly charged ions for all elements from hydrogen up to iron are needed. Although sources for these ions have been available for some time, the special demands of space instrumentation made it necessary to build a dedicated facility. We built an electron-cyclotron-resonance ion source operating at 2.45GHz using only permanent magnets. The ion source is installed on a high voltage platform allowing for post acceleration potentials of up to 100 kV. Ions are produced from elements in gaseous and solid phase; the latter from vapor emitted from a high temperature furnace closely attached to the ion source.

Helv. Phys. Acta 71, 23, 1998

New Test Facility for Solar Wind Instrumentation

Peter Wurz, Adrian Marti, Peter Bochsler
Physikalisches Institut, University of Bern, 3012 Bern, Switzerland

First experimental results from our new test facility for solar wind plasma particle instrumentation are presented. The test facility consists of an electron-cyclotron resonance ion source operating at 2.45 GHz using permanent magnets and an ccompanying ion-optical system for ion beam analysis, definition, and delivery. Ion beams can be produced from elements in gaseous as well as solid form. A simple model to explain the observed ion charge distributions is also introduced.

A. Marti, Ph.D. thesis, University of Bern, Switzerland, 1997

Entwicklung und Aufbau einer Elektron Zyklotron Resonanz Ionenquelle

Adrian Marti und Peter Bochsler
Physikalisches Institut, University of Bern, 3012 Bern, Switzerland