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X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
Published on: August 20, 2019
Laboratory measurements of electrostatic solitary structures generated by beam injection
Bertrand Lefebvre1, Li-Jen Chen, Walter Gekelman
1Space Science Center, University of New Hampshire, Durham, New Hampshire 03824, USA. bertrand.lefebvre@unh.edu
Abstract:
Electrostatic solitary structures are generated by injection of a suprathermal electron beam parallel to the magnetic field in a laboratory plasma. Electric microprobes with tips smaller than the Debye length (λDe) enabled the measurement of positive potential pulses with half-widths 4 to 25λDe and velocities 1 to 3 times the background electron thermal speed. Nonlinear wave packets of similar velocities and scales are also observed, indicating that the two descend from the same mode which is consistent with the electrostatic whistler mode and result from an instability likely to be driven by field-aligned currents.
