A5052308615- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Ion-surface interactions and analysis
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Metal and Thin Film Mechanics
- Electrostatic Discharge in Electronics
- Spacecraft Dynamics and Control
- Astro and Planetary Science
- Gyrotron and Vacuum Electronics Research
- Solar and Space Plasma Dynamics
- Mass Spectrometry Techniques and Applications
- Radiation Effects in Electronics
- Space Satellite Systems and Control
- Muon and positron interactions and applications
- Electron and X-Ray Spectroscopy Techniques
- Spacecraft Design and Technology
- Particle Detector Development and Performance
- Ionosphere and magnetosphere dynamics
- Aerospace Engineering and Energy Systems
- Boron Compounds in Chemistry
- Boron and Carbon Nanomaterials Research
University of Jyväskylä
2015-2024
University of Auckland
2022
Keio University
2017-2018
European Organization for Nuclear Research
2018
Tartu Observatory
2015
Pacific Insight Electronics (Canada)
2015
Texas A&M University
2011
Lawrence Berkeley National Laboratory
2006-2009
Governor Juan F. Luis Hospital & Medical Center
2008
A general-purpose three-dimensional (3D) simulation code IBSIMU for charged particle optics with space charge is under development at JYFL. The was originally developed designing a slit-beam plasma extraction and nanosecond scale chopping pulsed neutron generator, but has been further used many applications. features nonlinear FDM Poisson’s equation solver based on fast stabilized biconjugate gradient method ILU0 preconditioner solving electrostatic fields. generally accepted model...
The electric solar wind sail (E-sail) is a space propulsion concept that uses the natural dynamic pressure for producing spacecraft thrust. In its baseline form, E-sail consists of number long, thin, conducting, and centrifugally stretched tethers, which are kept in high positive potential by an onboard electron gun. gains efficiency from fact effective area, i.e., structure can be millions times larger than physical area thin tethers wires, offsets very weak. Indeed, according to most...
Experimental observation of cyclotron instabilities in a minimum-B confined electron resonance ion source plasma is reported. The are associated with strong microwave emission and burst energetic electrons escaping the plasma, explain periodic ms-scale oscillation extracted beam currents. Such non-linear effects detrimental for confinement highly charged ions due to perturbations at shorter intervals comparison their production time. It shown that repetition rate oxygen plasmas increases...
This paper presents the mission analysis, requirements, system design, level test results, as well mass and power budgets of a 1-unit CubeSat ESTCube-1 built to perform first in-orbit demonstration electric solar wind sail (E-sail) technology.The E-sail is propellantless propulsion concept that uses thin charged electrostatic tethers for turning momentum flux natural plasma stream, such wind, into spacecraft propulsion.ESTCube-1 will deploy charge 10 m long tether measure changes in...
In this article, we report on the in-orbit experience - an overview of ESTCube-1 operations from launch until experiment, as well lessons learned five years development and almost two operations. Lessons are identified point view system engineering, electrical mechanical software testing measurements, payload, management. Detailed flight results will be provided in dedicated articles. We hope that other teams can benefit our experience.
Multiple frequency heating is one of the most effective techniques to improve performance Electron Cyclotron Resonance (ECR) ion sources. The method increases beam current and average charge state extracted ions enhances temporal stability beams. It demonstrated in this paper that stabilizing effect two-frequency connected with suppression electron cyclotron instability. Experimental data show interaction between secondary microwave radiation hot component ECR source plasmas plays a crucial...
The experimental and theoretical research carried out at the Institute of Applied Physics resulted in development a new type electron cyclotron resonance ion sources (ECRISs)—the gasdynamic ECRIS. ECRIS features confinement mechanism magnetic trap that is different from Geller’s confinement, i.e., quasi-gasdynamic one similar to fusion mirror traps. Experimental studies were performed Simple Mirror Ion Source (SMIS) 37 facility. plasma was created by 37.5 75 GHz gyrotron radiation with power...
This paper presents the latest results of high current proton beam production at Simple Mirror Ion Source (SMIS) 37 facility Institute Applied Physics (IAP RAS). In this experimental setup, plasma is created and electrons are heated by 37.5 GHz gyrotron radiation with power up to 100 kW in a simple mirror trap fulfilling ECR condition. Latest experiments SMIS were performed using single-aperture two-electrode extraction system. Proton beams currents 450 mA voltages below 45 kV obtained. The...
Electron cyclotron resonance ion sources (ECRIS) have been essential in the research and applications of nuclear physics over past 40 years. They are extensively used a wide range large-scale accelerator facilities for production highly charged heavy beams stable radioactive elements. ECRISs susceptible to kinetic instabilities due heating mechanism leading anisotropic electron velocity distribution function. Instabilities type proven cause frequently observed periodic bursts 'hot' electrons...
Electron cyclotron resonance ion source (ECRIS) plasmas are prone to kinetic instabilities due anisotropic electron velocity distribution. The associated with strong microwave emission and periodic bursts of energetic electrons escaping the magnetic confinement. explain ms-scale oscillation extracted beam current observed several high performance ECRISs restrict parameter space available for optimization currents highly charged ions. Experiments JYFL 14 GHz ECRIS have demonstrated that...
In present paper, an approach for high yield compact D-D neutron generator based on a current gasdynamic electron cyclotron resonance ion source is suggested. Results dense pulsed deuteron beam production with up to 500 mA and density 750 mA/cm2 are demonstrated. Neutron from D2O TiD2 targets was measured in case of its bombardment by 300 D+ 45 keV energy. at target surface 109 s−1 cm−2 detected system two 3He proportional counters. Estimations obtained experimental results show that quality...
Electron cyclotron resonance ion source (ECRIS) plasmas are prone to kinetic instabilities due anisotropy of the electron energy distribution function stemming from resonant nature heating process. plasma related non-linear interaction between waves and energetic electrons resulting strong microwave emission a burst escaping plasma, explain periodic oscillations extracted beam currents observed in several laboratories. It is demonstrated with minimum-B 14 GHz ECRIS operating on helium,...
The measurement of the electron energy distribution (EED) electrons escaping axially from a minimum-B cyclotron resonance ion source (ECRIS) is reported. experimental data were recorded with room-temperature 14 GHz ECRIS at JYFL accelerator laboratory. through extraction mirror detected secondary amplifier placed downstream dipole magnet serving as an spectrometer 500 eV resolution. It was discovered that EED in range 5–250 keV strongly non-Maxwellian and exhibits several local maxima below...
The scientific mission of ESTCube-1, launched in May 2013, is to measure the electric solar wind sail (E-sail) force orbit.The experiment planned push forward development E-sail, a propulsion method recently invented at Finnish Meteorological Institute.The E-sail based on extracting momentum from plasma flow by using long thin electrically charged tethers.ESTCube-1 equipped with one such tether, together hardware capable deploying and charging it.At orbital altitude ESTCube-1 (660-680 km)...
Experimentally determined ion temperatures of different charge states and elements in minimum-B confined electron cyclotron resonance source (ECRIS) plasma are reported. It is demonstrated with optical emission spectroscopy, complemented by the energy spread measurements extracted beams, that temperature JYFL 14 GHz ECRIS 5–28 eV depending on species state. The reported an order magnitude higher than previously deduced from indirect diagnostics used simulations, but agree those for a...
Temporal evolution of plasma bremsstrahlung emitted by a 14 GHz electron cyclotron resonance ion source (ECRIS) operated in pulsed mode is presented the energy range 1.5–400 keV with 100 µs resolution. Such high temporal resolution together this has never been measured before an ECRIS. Data are as function microwave power, neutral gas pressure, magnetic field configuration and seed density. The saturation time count rate almost independent photon up to exhibits similar characteristics...
Formation of hydrogen ion beams with high intensity and low transverse emittance is one the key challenges in accelerator technology. Present work devoted to experimental investigation proton beam production from dense plasma (Ne > 1013 cm−3) an ECR discharge sustained by 37.5 GHz, 100 kW gyrotron radiation at SMIS 37 facility IAP RAS. The anticipated advantages gasdynamic source over current state-of-the-art technology based on 2.45 GHz discharges are described. Experimental result obtained...
The work presented in this article is devoted to time-resolved diagnostics of non-linear effects observed during the afterglow plasma decay a 14 GHz electron cyclotron resonance ion source operated pulsed mode. Plasma instabilities that cause perturbations extracted current were and studied. It shown these are associated with precipitation high energy electrons along magnetic field lines strong bursts bremsstrahlung emission. effect settings on onset was investigated. Based experimental data...
In order to improve the performance of JYFL 14 GHz electron cyclotron resonance ion source (ECRIS) and initiate low energy beam transport (LEBT) upgrade at University Jyväskylä, Department Physics (JYFL) accelerator laboratory, a new extraction system has been designed installed. The development was performed with optical code IBSimu, making it first ECRIS code. measured is in good agreement simulations. Compared old provides improved quality, i.e. lower transverse emittance values structure...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation J. Komppula, O. Tarvainen, S. Lätti, T. Kalvas, H. Koivisto, V. Toivanen, P. Myllyperkiö; VUV-diagnostics of a filament-driven arc discharge H− ion source. AIP Conference Proceedings 8 February 2013; 1515 (1): 66–73. https://doi.org/10.1063/1.4792771 Download citation file: Ris (Zotero) Reference Manager...
Abstract A Particle in Cell (PIC) model of ion beam extraction from a plasma provides strong evidence that the origin observed V (3/2) relationship between applied voltage and current is caused by meniscus shape collimation on electrode, not space charge limited extraction. Excellent correlation PIC model, gun code experiment shown for 100 µA Ar + beams. The s-shape emittance phase to be radial electric field created external edge electrode.
The results of optical emission spectroscopy experiments probing the cold electron population a 14 GHz Electron Cyclotron Resonance Ion Source (ECRIS) are reported. study has been conducted with high resolution spectrometer and data acquisition setup developed specifically for diagnostics weak line characteristic to ECRIS plasmas. lines low charge state ions neutral atoms neon have measured analyzed line-ratio method. aforementioned temperature (Te < 100 eV) is determined...