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Related Experiment Video

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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

Dissipation of electron-beam-driven plasma wakes.

Rafal Zgadzaj¹, T Silva², V K Khudyakov^3,4

¹University of Texas at Austin, 1 University Station C1600, Austin, TX, 78712-1081, USA.

Nature Communications

|September 22, 2020

Summary

Plasma wakefield accelerators deposit significant energy. This study reveals ion channels drive energy dissipation, crucial for high-current applications in advanced accelerators.

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Area of Science:

Plasma physics
Accelerator science
Laser-driven acceleration

Background:

Metre-scale plasma wakefield accelerators achieve high energy gain (near 10 GeV) for electron bunches.
Efficient energy dissipation from the wake is critical for achieving high average currents in these accelerators.
The mechanisms of wake energy dissipation into the surrounding plasma are not well understood.

Purpose of the Study:

To investigate the mechanisms of energy dissipation in plasma wakes.
To understand the role of ion channels in wake energy loss.
To provide insights into the thermodynamics of multi-gigaelectronvolt plasma accelerators.

Main Methods:

Picosecond-time-resolved optical shadowgraphy of ion channels.
Large-scale particle-in-cell simulations.
Experiments using electron bunches from the SLAC linac in lithium plasma.

Main Results:

Observed ion channels expanding radially at 1 million meters per second for over a nanosecond.
Simulations confirmed that outward-propagating ions and electrons, carrying 90% of wake energy, drive this expansion.
Identified impact ionization of neutral lithium as the primary expansion mechanism.

Conclusions:

The expansion of ion channels is a key mechanism for dissipating energy from plasma wakes.
Understanding this process is vital for optimizing plasma accelerators for high average beam currents.
These findings contribute to the fundamental understanding of multi-GeV plasma accelerator thermodynamics and applications.