Author: Izotov, I.
Paper Title Page
MOOMMH02
 First Ion Beams Extracted from a 60 GHz ECR Ion Source Using Polyhelices Technique  
 
  • T. Lamy, J. Angot, J. Jacob, P. Sole, T. Thuillier
    LPSC, Grenoble Cedex, France
  • M.I. Bakulin
    GYCOM Ltd, Nizhny Novgorod, Russia
  • F. Debray, J.M. Dumas, C. Grandclement, P. Sala, C. Trophime
    LNCMI, Grenoble Cedex, France
  • A.G. Eremeev, I. Izotov, B.Z. Movshevich, V. Skalyga
    IAP/RAS, Nizhny Novgorod, Russia
  
  Funding: We acknowledge the support of the LNCMI-CNRS, member of the European Magnetic Field Laboratory (EMFL) and the International Science and Technology Center (project#3965).
The first 18 GHz ECR plasma in an ion source prototype with a magnetic structure using high field magnets techniques was performed in 2012. The particularity of such a prototype is the establishing of a topologically closed ECR zone in a cusp configuration. During the current increase to get a closed 60 GHz zone, a failure appeared at 21000 A in one helix among the four. After the modification of the cooling circuit, the prototype was able to accept up to 26000 A allowing high frequency experiments. In the same time, a 60 GHz - 300 kW pulsed gyrotron has been successfully built and installed in Grenoble by IAP-RAS and Gycom company. The first 60 GHz ECR plasma has been produced in April 2014, the first pulsed beams have been extracted and analyzed. The experimental results obtained will be presented along with the perspectives of such developments. 		 
slides icon Slides MOOMMH02 [8.061 MB]  
 
MOOBMH01 Periodic Beam Burrent Oscillations Driven By Electron Cyclotron Instabilities In ECRIS Plasmas 5
 
  • O.A. Tarvainen, T. Kalvas, H. A. Koivisto, J.P.O. Komppula, R.J. Kronholm, J.P. Laulainen
    JYFL, Jyväskylä, Finland
  • I. Izotov, D. Mansfeld, V. Skalyga
    IAP/RAS, Nizhny Novgorod, Russia
  • V. Toivanen
    CERN, Geneva, Switzerland
  
  Experimental observation of cyclotron instabilities in electron cyclotron resonance ion source plasma operated in cw-mode is reported. The instabilities are associated with strong microwave emission and a burst of energetic electrons escaping the plasma, and explain the periodic oscillations of the extracted beam currents. The instabilities are shown to restrict the parameter space available for the optimization of high charge state ion currents.  
slides icon Slides MOOBMH01 [2.020 MB]  
 
MOOAMH02 High Current Proton and Deuteron Beams for Accelerators and Neutron Generators 30
 
  • V. Skalyga, S. Golubev, I. Izotov, S. Razin, V. Sidorov
    IAP/RAS, Nizhny Novgorod, Russia
  • T. Kalvas, H. A. Koivisto, O.A. Tarvainen
    JYFL, Jyväskylä, Finland
  • A.V. Maslennikova, A. Volovecky
    Nizhny Novgorod State Medical Academy, Nizhny Novgorod, Russia
  
  This paper presents the latest results of high current proton and deuteron beam production at SMIS 37 at the Institute of Applied Physics. In this experimental setup the plasma is created by 37.5 GHz gyrotron radiation with power up to 100 kW in a simple mirror trap. High microwave power and frequency allow sustaining higher density hydrogen plasma in comparison to conventional ECRIS's or microwave sources. The low ion temperature, on the order of a few eV, is beneficial to produce proton beams with low emittance. Latest experiments with hydrogen and deuterium show possibility of beam formation with currents up to 550 mA at high voltages below 45 kV with normalized rms emittance lower than 0.2 pi*mm*mrad. Such beams have a high potential for application in future accelerator research. Also in frames of the present paper it is suggested to use such an ion source in a scheme of D-D neutron generator. Such ion source can produce deuteron ion beams with current density up to 700-800 mA/cm2. Generation of the neutron flux with density at the level of 7-8*1010 s−1cm-2 could be obtained in case of TiD2 target bombardment with deuteron beam accelerated to 100 keV.  
slides icon Slides MOOAMH02 [1.961 MB]  
 
MOOAMH04
 Axial Symmetric Open Magnetic Traps with Depressed Transversal Losses of Plasmas  
 
  • V. Sidorov, S. Golubev, I. Izotov, S. Razin, V. Skalyga, A. Vodopyanov
    IAP/RAS, Nizhny Novgorod, Russia
  
  Development trend of the modern ECR ion sources is connected with the continued increase of the heating radiation frequency and, as a consequence, increase of the magnetic field value. In this case the construction of the MHD stable non-axial symmetric magnetic systems becomes rather complicated. Thus, the search of axial symmetric magnetic systems with depressed transversal losses caused by MHD instabilities is in a great demand. In this report some of the possible versions of such magnetic systems are presented: cusp magnetic trap, system with magnetic divertor and the mirror trap with the differential rotation layer in plasmas. Perspectives of using these systems in the ECR ion sources according to the results of experimental investigations on SMIS 37 setup in Nizhny Novgorod are discussed.  
slides icon Slides MOOAMH04 [1.257 MB]  
 
TUOMMH05 HIISI, New 18 GHz ECRIS for the JYFL Accelerator Laboratory 99
 
  • H. A. Koivisto, P. M.T. Heikkinen, T. Kalvas, K. Ranttila, O.A. Tarvainen
    JYFL, Jyväskylä, Finland
  • I. Izotov, V. Skalyga
    IAP/RAS, Nizhny Novgorod, Russia
  • G. Machicoane
    NSCL, East Lansing, Michigan, USA
  • T. Thuillier
    LPSC, Grenoble Cedex, France
  • D. Xie
    LBNL, Berkeley, California, USA
  
  At the end of 2013 the Academy of Finland granted an infrastructure funding for the JYFL Accelerator Laboratory in order to increase beam intensities for the international user community. The primary objective is to construct a new high performance ECR ion source, HIISI (Heavy Ion Ion Source Injector), for the K130 cyclotron. Using room temperature magnets the HIISI has been designed to produce about the same magnetic field configuration as the superconducting ECRIS SUSI at NSCL/MSU for 18 GHz operation. An innovative structure will be used to maximize the radial confinement and safety of the permanent magnets. The sextupole magnets are separated and insulated from the plasma chamber providing two advantages: 1) the permanent magnets can be cooled down to -20˚C, which increases especially their coercivity and 2) makes it possible to reach higher radial field at the inner surface of plasma chamber. Comprehensive simulations were performed with microwave power up to 6 kW to analyse and address all the heat loads and temperature distribution on the permanent magnet. In this article the magnetic field design and detailed innovative scheme for sextupole magnet will be presented.  
slides icon Slides TUOMMH05 [2.150 MB]  
 
WEOBMH04
 Theory of Cyclotron Instability of Hot Electrons in ECRIS: Origin, Manifestation, and Influence on Plasma Confinement  
 
  • D. Mansfeld, I. Izotov, V. Skalyga, M. Viktorov
    IAP/RAS, Nizhny Novgorod, Russia
  • O.A. Tarvainen
    JYFL, Jyväskylä, Finland
  
  Interaction between electromagnetic waves and particles in magnetoactive plasma under cyclotron resonance conditions can result in the growth of cyclotron instabilities of various kinds. Electron cyclotron instability (ECI) is a kinetic type instability, which is driven by the anisotropy of the energetic electrons distribution function traps with the transverse kinetic energy relative to the magnetic field dominating over the longitudinal one. One of the most interesting manifestations of ECI is the generation of bursts of electromagnetic radiation accompanied by hot electron precipitations from the trap. Such phenomena are observed in a wide range of plasma parameters: in the magnetospheres of the Earth and planets, in solar coronal loops, and in laboratory magnetic traps. Recently ECI were experimentally observed in ECR ion sources and it was shown that bursts of hot electrons escaping from the trap can destruct plasma confinement affecting highly charged ions beams current [1]. In this report we discuss basic mechanisms of cyclotron instability growth in non-equilibrium plasma of ECR discharge, main features of instability manifestation and its influence on ECRIS parameters.
* O Tarvainen et al 2014 Plasma Sources Sci. Technol. 23 025020 		 
slides icon Slides WEOBMH04 [1.123 MB]  
 
THOMMH03 A Point-like Source of Extreme Ultraviolet Radiation Based on Non-equilibrium Discharge, Sustained by Powerful Radiation of Terahertz Gyrotron 140
 
  • V. Sidorov, M.Yu. Glyavin, S. Golubev, I. Izotov, A.G. Litvak, G. Luchinin, D. Mansfeld, S. Razin, V. Skalyga, A. Vodopyanov
    IAP/RAS, Nizhny Novgorod, Russia
  
  Funding: The work was supported by RSF within grant No 14-12-00609.
It is proposed in this paper to use discharge plasma supported by terahertz radiation as a source of EUV light for high-resolution lithography. In this report we discuss the experimental investigation of two types of EUV sources based on discharge, supported by powerful gyrotron radiation. Following investigation results are described: -a series of experiments that demonstrate the generation of EUV light from the vacuum-arc discharge plasma in tin vapor in the magnetic trap heated by gyrotron radiation with a frequency of 75 GHz under electron cyclotron resonance (ECR) conditions; -a numerical modeling of the plasma emissivity in the EUV range, depending on the parameters of the heating radiation is performed; -experimental studies of EUV emission from plasma discharge sustained by strong terahertz powerful radiation in inhomogeneous gas flows are started. 		 
slides icon Slides THOMMH03 [1.249 MB]