Schematic of the INS-e device.
Radial profiles of the plasma potential at various fill pressures. The bias voltages for the extractor grids, the outer grid, and the inner grid are all . (Reproduced from Ref. 12.)
(a) Temporal evolution of plasma potential at the center of the virtual cathode with and without rf modulation. (Reproduced from Ref. 19.) (b) Delay in the virtual cathode destruction due to rf modulation as a function of modulation frequency. (Reproduced from Ref. 19.)
Comparison between the experimentally measured resonance frequencies due to POPS oscillation (points) and the theoretical calculations (lines) as a function of potential well depth in the virtual cathode and ion mass. (Reproduced from Ref. 19.)
Delay in the loss of the virtual cathode as a function of rf modulation amplitude at the POPS frequency ( for ions). The inner grid bias of (pulse), the outer grid bias of (dc), and the extractor grid bias of (pulse) are used to create the potential well depth of .
Ion density profiles: (a) before compression, (b) after compression. Electron density profiles: (c) before compression, (d) after compression. Electrostatic potential profiles: (e) before compression, (f) after compression.
POPS dynamics for focused electron injection: (a) electron density at maximum compression and (b) ion density at maximum compression.
Potential applications for POPS fusion devices and required radial compression based on modular design.
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