Bulletin of the American Physical Society
2021 Annual Meeting of the APS Four Corners Section
Volume 66, Number 11
Friday–Saturday, October 8–9, 2021; Virtual; Mountain Daylight Time
Session J02: Plasma Physics |
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Chair: Alysia Marino, University of Colorado Boulder |
Saturday, October 9, 2021 10:45AM - 11:09AM |
J02.00001: Plasma Wakefield Accelerator Research at FACET-II Invited Speaker: Michael Litos Plasma-based particle accelerators offer an opportunity to significantly reduce the size and cost of high-energy particle beams for applications ranging from ultrafast electron diffraction, to X-ray free electron lasers, to high-energy particle colliders. These applications in turn serve users in a variety of research fields by permitting access to ultrafast dynamics at atomic scales, or even fundamental particle interactions. Plasma wakefield accelerators (PWFAs) can sustain accelerating electric fields that are orders of magnitude greater than conventional metallic accelerating structures due in part to the fact that the plasma medium cannot itself be destroyed by the fields, in contrast to metallic structures. Researchers have shown that PWFAs can provide the promised large rates of acceleration to electron bunches, and the next great challenge for the field is to is to preserve the quality (i.e. emittance) of the accelerated bunches. This will be achieved by utilizing the plasma source itself to precisely focus the electron bunches into the PWFA, matching the natural divergence of the electron beam to the strong focusing force experienced in the plasma. Experiments planned at the currently-commissioning FACET-II facility at SLAC National Accelerator Laboratory aim to accomplish this alongside other tangential research goals utilizing relativistic particle beams and plasmas. [Preview Abstract] |
Saturday, October 9, 2021 11:09AM - 11:21AM |
J02.00002: Polyvinylidene Fluoride Impact Charge Production After High Temperature Exposures Alex Doner, Mihaly Horanyi, John Fontanese A thin permanently polarized film of a resin monomer, polyvinylidene fluoride (PVDF), produces a charge when struck with a fast moving dust particle. These films are used to measure the dust flux in space-like environments and have been used on many spacecraft. This experiment determined whether or not these films produce the same charge after they are exposed to temperatures up to 120 \^{A}\textdegree C, the highest temperatures observed on the lunar surface. In order to determine this, a PVDF film was exposed to 120 \^{a}\quotedblbase $f$ for a cumulative period of 14 days and then tested first with a fast pulse high-power laser and then with actual dust impactors. The output signal amplitudes were compared with the relative laser pulse energy and the mass and velocity of the dust impactors. The results suggest that these films survive at 120 \^{A}\textdegree C and may be a suitable detector to measure the interplanetary dust flux that bombards the lunar surface. These future dust flux measurements can help us further our understanding of planetary formation in our solar system as well as the dust lofting mechanisms that lift dust off of the lunar surface. [Preview Abstract] |
Saturday, October 9, 2021 11:21AM - 11:33AM |
J02.00003: Demonstrating Ring Currents in a Planeterrella Device: Experiments and Modeling. Ethan Ayari Plasmas confined in a dipole magnetic field give insight into the basic physics describing how planetary magnetospheres behave and evolve over time. A laboratory Planeterrella setup is used to visualize ring currents ~~\textbf{~}through light emission generated by impact excitation, ionization, and recombination processes.~The Planeterrella device consists of a vacuum chamber with a 0.5 Tesla Neodymium bar magnet embedded within a biased aluminum sphere. The bar magnet combined with the potential difference between the biased sphere and the grounded chamber subject the charged particles to a vertically oriented magnetic dipole field and a radially inward electric field. Low pressures (\textasciitilde 400 mTorr) paired with applied voltages yield visible plasma ring currents. For the detailed analysis of these experiments, a Runge- Kutta-based Monte Carlo Collisional (MCC) algorithm was developed to follow the motion of electrons within ~the electromagnetic fields and track their collisions with ~neutral \textunderscore \textunderscore $_{\mathrm{2}}$ and \textunderscore \textunderscore $_{\mathrm{2}}$ particles. The MCC algorithm successfully reproduced the two visible rings.~ [Preview Abstract] |
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