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This post reviews work measuring electrons inside a polywell. First, news about a film and a paper from Turkey are covered. The Australian team used a new biased probe to find electron density, temperature, speed and the local voltage. This data came from reading the current drawn by the probe. Due to cost limitations, this analysis could not be automated. Precise equations for the plasma and probe were fitted to the data, by hand. A new 4” aluminum polywell was used. Results from simulations are also presented. Five tests were done. First, a beam was measured, and this bench marked the probe and analysis. Second, the center was checked with and without a magnetic field and results supported electron trapping. Next, measurements were made along the x-axis and this also showed trapping. The fourth test looked at the ring fields’ effect on the electron cloud. Data showed that the potential well increases with ring strength. Finally, the electric fields impact on the potential well was tested. The center gets more negative as more and, faster electrons are injected. This effect ends when speedy electron can escape the ring field. The details of the paper are in the appendix, and select data can be downloaded.
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