Ion beam parameters of a plasma accelerator

Nazarov, V. G.; Vinogradov, A.; Veselovzorov, A. N.; Efremov, V. K.

doi:10.1007/bf00898145

Cited by 1 publication

(2 citation statements)

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“…Plasma density build-up and its homogeneity: The plasma production process has been studied in present-day tokamaks and stellarators under various conditions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][20][21][22][23]. The ICRF plasmas with typical density n e ≈3×10…”

Section: Icrf Plasma Characterizationmentioning

confidence: 99%

“…The alternative ICRF plasma production technique was developed originally for routine use in stellarators in the scenario 3 [2] and 1 [3] and successfully adapted later for the tokamak applications in the scenario 1 [4][5][6][7] and 2 [4,8]. The present-day and future superconducting fusion machines need alternative and efficient wall conditioning techniques for the routine operation in the presence of permanent high magnetic field, which prevents the use of conventional Glow Discharge Conditioning (GDC).…”

Section: Target Dense Rf Plasma Production (N E ≥10mentioning

confidence: 99%

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ICRF Wall Conditioning: Present Status and Developments for Future Superconducting Fusion Machines

Lyssoivan¹,

Koch²,

Noterdaeme³

et al. 2009

AIP Conference Proceedings

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Abstract. ITER and future superconducting fusion machines need efficient wall conditioning techniques for routine operation in between shots in the presence of permanent high magnetic field for wall cleaning, surface isotope exchange and to control the in-vessel long term tritium retention. Ion Cyclotron Wall Conditioning (ICWC) based on the ICRF discharge is fully compatible and needs the presence of the magnetic field. The present paper focuses on the 18th Topical Conference on Radio Frequency Power in Plasmas, Gent, Belgium 2009, AIP Conference Proceedings 1187, Melville, New York, 2009 principal aspects of the ICWC discharge performance in large-size fusion machines: (i) neutral gas RF breakdown with conventional ICRF heating antennas, (ii) antenna coupling with low density (~10 17 m -3 ) RF plasmas and (iii) ICWC scenarios with improved RF plasma homogeneity in the radial and poloidal directions. All these factors were identified as crucial to achieve an enhanced conditioning effect (e.g. removal rates of selected "marker" masses). All the observed effects are analyzed in terms of RF plasma wave excitation/absorption and compared with the predictions from 1-D RF full wave and 0-D RF plasma codes. Numerical modeling and empirical extrapolation from the existing machines give good evidence for the feasibility of using ICWC in ITER with the main ICRF antenna.

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