Low-power rf plasma sources for technological applications: I. Plasma sources without a magnetic field

2004 ◽  
Vol 49 (5) ◽  
pp. 565-571 ◽  
Author(s):  
K. V. Vavilin ◽  
A. A. Rukhadze ◽  
M. Kh. Ri ◽  
V. Yu. Plaksin
Keyword(s):  
Magnetic Field ◽  
Low Power ◽  
Rf Plasma ◽  
Plasma Sources

Low-power inductive RF plasma sources for technological applications

2004 ◽  
Vol 30 (8) ◽  
pp. 687-697 ◽  
Author(s):  
K. V. Vavilin ◽  
A. A. Rukhadze ◽  
M. Kh. Ri ◽  
V. Yu. Plaksin
Keyword(s):  
Low Power ◽  
Rf Plasma ◽  
Plasma Sources

Low-Power RF plasma sources for technological applications: III. helicon plasma sources

2004 ◽  
Vol 49 (6) ◽  
pp. 691-697 ◽  
Author(s):  
K. V. Vavilin ◽  
A. A. Rukhadze ◽  
Kh. M. Ri ◽  
V. Yu. Plaksin
Keyword(s):  
Low Power ◽  
Rf Plasma ◽  
Helicon Plasma ◽  
Plasma Sources

Low-power RF plasma sources for technological applications: II. plasma sources under anomalous skin effect conditions

2004 ◽  
Vol 49 (6) ◽  
pp. 686-690 ◽  
Author(s):  
K. V. Vavilin ◽  
V. Yu. Plaksin ◽  
Kh. M. Ri ◽  
A. A. Rukhadze
Keyword(s):  
Low Power ◽  
Skin Effect ◽  
Rf Plasma ◽  
Plasma Sources ◽  
Anomalous Skin Effect

scholarly journals Magnetic nozzle radiofrequency plasma thruster approaching twenty percent thruster efficiency

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kazunori Takahashi
Keyword(s):  
Magnetic Field ◽  
Electric Propulsion ◽  
Transfer Efficiency ◽  
Rf Plasma ◽  
Power Transfer ◽  
Rf Power ◽  
Plasma Production ◽  
Magnetic Nozzle ◽  
Plasma Thruster ◽  
Power Transfer Efficiency

AbstractDevelopment of a magnetic nozzle radiofrequency (rf) plasma thruster has been one of challenging topics in space electric propulsion technologies. The thruster typically consists of an rf plasma source and a magnetic nozzle, where the plasma produced inside the source is transported along the magnetic field and expands in the magnetic nozzle. An imparted thrust is significantly affected by the rf power coupling for the plasma production, the plasma transport, the plasma loss to the wall, and the plasma acceleration process in the magnetic nozzle. The rf power transfer efficiency and the imparted thrust are assessed for two types of rf antennas exciting azimuthal mode number of $$m=+1$$ m = + 1 and $$m=0$$ m = 0 , where propellant argon gas is introduced from the upstream of the thruster source tube. The rf power transfer efficiency and the density measured at the radial center for the $$m=+1$$ m = + 1 mode antenna are higher than those for the $$m=0$$ m = 0 mode antenna, while a larger thrust is obtained for the $$m=0$$ m = 0 mode antenna. Two-dimensional plume characterization suggests that the lowered performance for the $$m=+1$$ m = + 1 mode case is due to the plasma production at the radial center, where contribution on a thrust exerted to the magnetic nozzle is weak due to the absence of the radial magnetic field. Subsequently, the configuration is modified so as to introduce the propellant gas near the thruster exit for the $$m=0$$ m = 0 mode configuration and the thruster efficiency approaching twenty percent is successfully obtained, being highest to date in the kW-class magnetic nozzle rf plasma thrusters.

An Innovative Low Cost Well Monitoring Solution: W.A.N.D

2021 ◽  
Author(s):  
Jean Grégoire Boero Rollo ◽  
John Richard Ordonez Varela ◽  
Tayssir Ben Ghzaiel ◽  
Cedric Mouanga ◽  
Arnaud Luxey ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Power ◽  
Low Cost ◽  
Field Measurements ◽  
Cost Effective ◽  
Complex Environment ◽  
Sensor Device ◽  
Magnetic Field Measurements ◽  
Pipeline Monitoring ◽  
Harsh Conditions

Abstract Wireless Autonomous Nano-sensor Device (WAND) system is a disruptive cost-effective micro-system for well monitoring. It allows to realize pressure, temperature, inertial, and magnetic field measurements in harsh conditions; it also offers Bluetooth low-power communication and Wireless charging capabilities. Analysis’ results of an industrial offshore pilot realized in Congo (a world first in O&G industry in such complex environment), and major improvements implemented after this pilot are reported in this paper. Accomplished advancements comprise hardware and software developments extending operation lifetime, and simplifying on-site utilization. To date, there is not a commercial solution of this type in the market, the realization of this project is a real innovation allowing practical and low-cost monitoring during well intervention while minimizing the risks associated with standard Rigless intervention. Other applications regarding dry-tree wells on tension-leg platforms (TLP), drilling and completion operations, and pipeline monitoring are being investigated, too.

High temperature electrons exhausted from rf plasma sources along a magnetic nozzle

2017 ◽  
Vol 24 (8) ◽  
pp. 084503 ◽  
Author(s):  
Kazunori Takahashi ◽  
Hikaru Akahoshi ◽  
Christine Charles ◽  
Rod W. Boswell ◽  
Akira Ando
Keyword(s):  
High Temperature ◽  
Rf Plasma ◽  
Plasma Sources ◽  
Magnetic Nozzle

scholarly journals The current sheet flapping motions induced by non-adiabatic ions: case study

2018 ◽  
Author(s):  
Xinhua Wei ◽  
Chunlin Cai ◽  
Henri Rème ◽  
Iannis Dandouras ◽  
George Parks
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Field Line ◽  
Magnetic Field Line ◽  
Plasma Sheet ◽  
Plasma Sources ◽  
Shear Structures ◽  
Particle Population ◽  
Alternating Bending

Abstract. In this paper, we analyzed the y-component of magnetic field line curvature in the plasma sheet and found that there are two kinds of shear structures of the flapping current sheet, i.e. symmetric and antisymmetric. The alternating bending orientations of guiding field are exactly corresponding to alternating north-south asymmetries of the bouncing ion population in the sheet center. Those alternating asymmetric plasma sources consequently induce the current sheet flapping motion as a driver. In addition, a substantial particle population with dawnward motion was observed in the center of a bifurcated current sheet. This population is identified as the quasi-adiabatic particles, and provides a net current opposite to the conventional cross-tail current.

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