Speaker
Description
SEISM (Sixty-gigahertz Ion Source using Megawatt magnets) is a 60 GHz electron-cyclotron-resonance ion source that achieved in 2014 a record pulsed multicharged-ion current density of about 1 A/cm$^{2}$. Operation resumed in 2021 after upgrades to the beam line, and several experimental campaigns were performed to reproduce the conditions that previously enabled such high extracted currents.
Following the failure of the 60 GHz gyrotron in 2024, the setup was adapted to operate at 18 GHz with a new aluminum plasma chamber manufactured by additive techniques. This new microwave system, capable of both CW and pulsed operation, enabled renewed investigations of SEISM plasmas as well as emittance measurements using a pepperpot diagnostic.
Recent measurements revealed the presence of non-synchronized afterglow pulses, so far observed exclusively on SEISM. Although still under investigation, this phenomenon appears promising for advancing our understanding of CUSP-based plasma physics. Emittance scans have also identified distinct charge-state populations in argon plasmas and quantified the influence of microwave pulse duration and bias-disk voltage on beam quality and extracted current. These recent developments and results will be presented.
| Classification | MC1: New developments and status reports |
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