Study of Plasma Flow Velocity in an Open SMOLA Screw Trap

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The physics of confinement of a rotating plasma in a magnetic field with linear helical symmetry is being studied at the Institute of Nuclear Physics SB RAS on the open SMOLA trap. An indicator of the quality of confinement is the plasma flow velocity in the system. The paper describes the applied diagnostics based on the Mach probe under conditions of non-magnetized plasma, which made it possible to determine the longitudinal flow velocity in experiments. The measured longitudinal flow velocity was (0.5–5) · 106 cm/s in various operating modes of the installation. The dependence of the speed on the magnitude of the magnetic field corrugation is discussed. A reverse flow of trapped particles returning to the containment zone has been detected.

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A. Inzhevatkina

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: a.a.inzhevatkina@inp.nsk.su
俄罗斯联邦, Novosibirsk

I. Ivanov

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences

Email: a.a.inzhevatkina@inp.nsk.su
俄罗斯联邦, Novosibirsk

V. Postupaev

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences

Email: a.a.inzhevatkina@inp.nsk.su
俄罗斯联邦, Novosibirsk

A. Sudnikov

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences

Email: a.a.inzhevatkina@inp.nsk.su
俄罗斯联邦, Novosibirsk

M. Tolkachev

Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences

Email: a.a.inzhevatkina@inp.nsk.su
俄罗斯联邦, Novosibirsk

V. Ustyuzhanin

Novosibirsk State University

Email: a.a.inzhevatkina@inp.nsk.su
俄罗斯联邦, Novosibirsk

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2. Fig. 1. Scheme of the SMOLA setup and the used diagnostics: 1 - plasma source, 2 - input expander (holding zone), 3 - transport section, 4 - output expander, 5 - direct solenoid, 6 - screw winding, 7 - plasma jet position correction coils, 8 - limiter, 9 - plasma receiver, 10 - probe assembly: double probe and two emission probes, 11 - Doppler spectrometer, 12 - probe assembly: a Mach probe and two emission probes. The individual coils are shown as rectangles. Thin lines near the axis show the magnetic surface resting on the limiters

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3. Fig. 2. Configuration of the magnetic field at the leading field in the solenoid of 70 mTl and switched off helical field: red dotted line - mode with a wide jet, green solid line - mode with a narrow jet

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4. Fig. 3. Distribution of the radial electric field at Z = 2.04 m in different magnetic field configurations: red circle - mode with a wide jet, green square - mode with a narrow jet

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5. Fig. 4. Plasma density distribution at Z = 2.04 m in different magnetic field configurations: red circle - mode with a wide jet, green square - mode with a narrow jet

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6. Fig. 5. Plasma density distribution at Z = 2.04 m in the narrow jet regime: red circle - in the direct field, blue triangle - in the helical field

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7. Fig. 6. Scheme of the Mach probe at the SMOLA facility: 1 - tungsten wire, 2 - ceramic capillary, 3 - sputtered molybdenum electrode, 4 - quartz plate

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8. Fig. 7. Typical oscillograms of the main signals: a - plasma current; b - voltage applied between the anode and cathode of the plasma source, c - emission probe potential, ion saturation currents of the windward up (thin red line) and leeward down (thick green line) sides in direct (d) and helical (e) magnetic fields

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9. Fig. 8. Dependence of the flow velocity on the rotation angle of the Mach probe at Z = 2.4 m and r = 1 cm. Red circle - experimentally obtained results, blue dashed line - inscribed trigonometric function

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10. Fig. 9. Plasma velocity modulus in the direct (red circle) and helical (blue triangle) magnetic fields at Z = 2.4 m

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11. Fig. 10. Radial dependence of the plasma velocity modulus: red circle - rotating probe at Z = 2.40 m, green square - probe assembly at Z = 2.94 m

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12. Fig. 11. Radial dependence of the angle between the flux velocity and the leading magnetic field: red circle - rotating probe in Z = 2.4 m, green square - probe assembly in Z = 2.94 m

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13. Fig. 12. a - radial dependence of the azimuthal plasma velocity in the direct field in the exit expander at Z = 4.34 m; b - radial dependence of the flow velocity in the direct field in the exit expander at Z = 5.3 m

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14. Fig. 13. Radial distribution of ion saturation currents from the ‘windward’ (uncoloured) and ‘leeward’ (coloured) sides. Blue triangle - helical field, red circle - direct field

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15. Fig. 14. Radial dependences of the longitudinal component of the flow velocity at Z = 2.94 m. Red circle - straight field, blue square - helical field

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