Towards a better comprehension of plasma formation and heating in high performances electron cyclotron resonance ion sources (invited)

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3672107· OSTI ID:22063841

Mascali, D; Gammino, S; Celona, L; Ciavola, G ^[1]

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1. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, via S. Sofia 62, 95123 Catania (Italy)

Further improvements of electron cyclotron resonance ion sources (ECRIS) output currents and average charge state require a deep understanding of electron and ion dynamics in the plasma. This paper will discuss the most recent advances about modeling of non-classical evidences like the sensitivity of electron energy distribution function to the magnetic field detuning, the influence of plasma turbulences on electron heating and ion confinement, the coupling between electron and ion dynamics. All these issues have in common the non-homogeneous distribution of the plasma inside the source: the abrupt density drop at the resonance layer regulates the heating regimes (from collective to turbulent), the beam formation mechanism and emittance. Possible means to boost the performances of future ECRIS will be proposed. In particular, the use of Bernstein waves, in preliminary experiments performed at Laboratori Nazionali del Sud (LNS) on MDIS (microwave discharge ion sources)-type sources, has permitted to sustain largely overdense plasmas enhancing the warm electron temperature, which will make possible in principle the construction of sources for high intensity multicharged ions beams with simplified magnetic structures.

• OSTI ID: 22063841
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
43 PARTICLE ACCELERATORS
BEAM CURRENTS
BEAM PRODUCTION
BERNSTEIN MODE
CHARGE STATES
ECR ION SOURCES
ELECTRON CYCLOTRON-RESONANCE
ELECTRON SPECTRA
ELECTRON TEMPERATURE
ENERGY SPECTRA
HIGH-FREQUENCY DISCHARGES
MAGNETIC FIELDS
MULTICHARGED IONS
PLASMA CONFINEMENT
PLASMA HEATING
PLASMA PRODUCTION
PLASMA WAVES