Bulletin of the American Physical Society
65th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 30–November 3 2023; Denver, Colorado
Session GP11: Poster Session III:
LTP: Measurement, analysis and control of low temperature plasmas
Fundamental: Waves, instabilities, and turbulence
MFE: Stellarators: W7-X, LHD, HSX, CTH, Others; Divertor physics
9:30 AM - 12:30 PM
Tuesday, October 31, 2023
Room: Plaza ABC
Abstract: GP11.00050 : Laboratory Excitation of Chirped EMIC Waves*
Presenter:
Stephen T Vincena
(UCLA)
Authors:
Stephen T Vincena
(UCLA)
Shreekrishna Tripathi
(University of California, Los Angeles)
Preliminary experiments are conducted at the Basic Plasma Science Facility (BaPSF) at UCLA using the Large Plasma Device (LaPD). The goal is to model a subset of conditions relevant to the generation of energetic-ion-driven EMIC waves in the Earth's magnetosphere and to observe the effects of such waves on the background plasma (ions and electrons) as well as other energetic, injected electron test particle populations.
Energetic ions (vbeam ~ vA ) are injected at a variety of energies and pitch angles to excite the EMIC waves. This is achieved using a 15 keV, 10 A fast ion source mounted at the end of LAPD, opposite the plasma source. Either protons or helium (He+) ions can be injected into mixtures of He, H, Ne, or Ar plasmas. In these experiments, a variety of gradients in the downstream background magnetic field are used to investigate the conditions under which chirping, time-frequency signatures in the wave magnetic field spectra can best be achieved. Such chirping waves are believed to efficiently scatter energetic electrons into the loss cone to help deplete the Earth's radiation belts.
*These experiments are performed in the Large Plasma Device at UCLA's Basic Plasma Science Facility, which is a collaborative research facility funded by the US DoE and NSF.
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