Temporal evolution of electron cloud in a cylindrical Penning trap at room temperature

Area of Science:

• Physics
• Plasma Physics

Background:

• Electron clouds are crucial in various physics applications.
• Understanding their behavior, especially radial expansion, is key for controlling experiments.
• Current methods for monitoring electron clouds can be destructive.

Purpose of the Study:

• To develop a non-destructive method for monitoring electron cloud radial expansion.
• To analyze the temporal evolution of electron clouds in a Penning trap.
• To establish a technique for single-shot detection and continuous monitoring.

Main Methods:

• Utilizing a resonance circuit to observe the axial oscillation frequency of the electron cloud's center of mass.
• Recording the temporal evolution of the electron cloud at room temperature.
• Analyzing the unique temporal pattern of frequency variation linked to radial expansion.

Main Results:

• The study successfully recorded the temporal evolution of the electron cloud.
• A direct correlation was found between the frequency variation pattern and the cloud's radial expansion.
• The electron cloud was observed to expand radially due to interactions with residual gas molecules.
• The cloud was ultimately lost upon impact with Penning trap electrodes.

Conclusions:

• The observed frequency variation pattern is a reliable indicator of electron cloud radial expansion.
• The developed resonance circuit technique provides a non-destructive means for single-shot detection.
• This method enables continuous monitoring of electron cloud radial expansion during confinement.
• The technique offers a significant advancement over destructive monitoring methods.