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Title: Limitation of the ECRIS performance by kinetic plasma instabilities (invited)

Electron cyclotron resonance ion source (ECRIS) plasmas are prone to kinetic instabilities due to anisotropic electron velocity distribution. The instabilities are associated with strong microwave emission and periodic bursts of energetic electrons escaping the magnetic confinement. The instabilities explain the periodic ms-scale oscillation of the extracted beam current observed with several high performance ECRISs and restrict the parameter space available for the optimization of extracted beam currents of highly charged ions. Experiments with the JYFL 14 GHz ECRIS have demonstrated that due to the instabilities the optimum B{sub min}-field is less than 0.8B{sub ECR}, which is the value suggested by the semiempirical scaling laws guiding the design of ECRISs.
Authors:
; ; ; ; ;  [1] ; ;  [2] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Department of Physics, University of Jyväskylä, 40500 Jyväskylä (Finland)
  2. Institute of Applied Physics, RAS, 46 Ul’yanova St., 603950 Nizhny Novgorod (Russian Federation)
  3. (UNN), 23 Gagarina St., 603950 Nizhny Novgorod (Russian Federation)
  4. European Organization for Nuclear Research (CERN), 1211 Geneva 23 (Switzerland)
  5. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
Publication Date:
OSTI Identifier:
22482864
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANISOTROPY; BEAM CURRENTS; ECR ION SOURCES; GHZ RANGE 01-100; IONS; MAGNETIC CONFINEMENT; MICROWAVE RADIATION; PERFORMANCE; PERIODICITY; PLASMA; PLASMA INSTABILITY; SCALING LAWS; TAIL ELECTRONS