31 citations · 158 across the 17 of their papers we have counts for
18 papers
Diagnostics of charge breeder electron cyclotron resonance ion source plasma with consecutive transients method
Julien Angot, Olli Tarvainen, Hannu Koivisto +3
The consecutive transients (CT) method is a diagnostics approach combining experimental and computational techniques to probe the plasma parameters of Charge Breeder Electron Cyclo…
The longitudinal energy spread of ion beams extracted from an electron cyclotron resonance ion source
Julien Angot, Olli Tarvainen, Pierre Chauveau +5
We present a study of factors affecting the energy spread of ion beams extracted from a Charge Breeder Electron Cyclotron Resonance Ion Source (CB-ECRIS). The comprehensive simulat…
High Power Vacuum Ultraviolet Source Based on Gasdynamic ECR Plasma
R. L. Lapin, V. A. Skalyga, S. V. Golubev +2
We report experimental results of vacuum ultraviolet (VUV) emission from the plasma of an electron cyclotron resonance (ECR) discharge in hydrogen, sustained by powerful millimeter…
Method for estimating charge breeder ECR ion source plasma parameters with short pulse 1+ injection
J. Angot, M. Luntinen, T. Kalvas +6
A new method for determining plasma parameters from beam current transients resulting from short pulse 1+ injection into a Charge Breeder Electron Cyclotron Resonance Ion Source (C…
Controlled turbulence regime of electron cyclotron resonance ion source for improved multicharged ion performance
V. A. Skalyga, I. V. Izotov, A. G. Shalashov +5
Fundamental studies of excitation and non-linear evolution of kinetic instabilities of strongly nonequlibrium hot plasmas confined in open magnetic traps suggest new opportunities…
Experimental evidence on photo-assisted O ion production from AlO cathode in cesium sputter negative ion source
O. Tarvainen, R. Kronholm, M. Laitinen +8
The production of negative ions in cesium sputter ion sources is generally considered to be a pure surface process. It has been recently proposed that ion pair production could exp…
Design of a 10 GHz minimum-B quadrupole permanent magnet electron cyclotron resonance ion source
T. Kalvas, O. Tarvainen, V. Toivanen +1
This paper presents a simulation study of a permanent magnet electron cyclotron resonance ion source (ECRIS) with a minimum-B quadrupole magnetic field topology. The magnetic field…
Study of Gasdynamic Electron Cyclotron Resonance Plasma Vacuum Ultraviolet Emission to Optimize Negative Hydrogen Ion Production Efficiency
R. L. Lapin, V. A. Skalyga, I. Izotov +6
Negative hydrogen ion sources are used as injectors into accelerators and drive the neutral beam heating in ITER. Certain processes in low-temperature hydrogen plasmas are accompan…
Measurements of the energy distribution of electrons lost from the minimum B-field -- the effect of instabilities and two-frequency heating
Ivan Izotov, Olli Tarvainen, Vadim Skalyga +5
Further progress in the development of ECR ion sources (ECRIS) requires deeper understanding of the underlying physics. One of the topics that remains obscure, though being crucial…
The role of rf-scattering in high-energy electron losses from minimum-B ECR ion source
I. V. Izotov, A. G. Shalashov, V. A. Skalyga +7
The measurement of the axially lost electron energy distribution escaping from a minimum-B electron cyclotron resonance ion source in the range of 4-800 keV is reported. The experi…
Observation of Poincaré-Andronov-Hopf bifurcation in cyclotron maser emission from plasma magnetic trap
A. G. Shalashov, E. D. Gospodchikov, I. V. Izotov +3
We report the first experimental evidence of a controlled transition from the generation of periodic bursts of electromagnetic emission into continuous wave regime of a cyclotron m…
Measurement of the energy distribution of electrons escaping minimum-B ECR plasmas
Ivan Izotov, Olli Tarvainen, Vadim Skalyga +4
The measurement of the electron energy distribution (EED) of electrons escaping axially from a minimum-B electron cyclotron resonance ion source (ECRIS) is reported. The experiment…
VUV irradiance measurement of a 2.45 GHz microwave-driven hydrogen discharge
J. Komppula, O. Tarvainen, T. Kalvas +4
Absolute values of VUV-emission of a 2.45 GHz microwave-driven hydrogen discharge are reported. The measurements were performed with a robust and straightforward method based on a…
Plasma heating power dissipation in low temperature hydrogen plasmas
J. Komppula, O. Tarvainen
Theoretical framework for power dissipation in low temperature plasmas in corona equilibrium is developed. The framework is based on fundamental conservation laws and reaction cros…
Photoelectron Emission from Metal Surfaces Induced by Radiation Emitted by a 14 GHz Electron Cyclotron Resonance Ion Source
Janne Laulainen, Taneli Kalvas, Hannu Koivisto +3
Photoelectron emission measurements have been performed using a room-temperature 14 GHz ECR ion source. It is shown that the photoelectron emission from Al, Cu, and stainless steel…
VUV diagnostic of electron impact processes in low temperature molecular hydrogen plasma
J. Komppula, O. Tarvainen
Novel methods for diagnostics of molecular hydrogen plasma processes, such as ionization, production of high vibrational levels, dissociation of molecules via excitation to singlet…
Photoelectron Emission from Metal Surfaces Induced by VUV-emission of Filament Driven Hydrogen Arc Discharge Plasma
J. Laulainen, T. Kalvas, H. Koivisto +2
Photoelectron emission measurements have been performed using a filament-driven multi-cusp arc discharge volume production H^- ion source (LIISA). It has been found that photoelect…
E-sail test payload of ESTCube-1 nanosatellite
Jouni Envall, Pekka Janhunen, Petri Toivanen +17
The scientific mission of ESTCube-1, launched in May 2013, is to measure the Electric solar wind sail (E-sail) force in orbit. The experiment is planned to push forward the develop…