Collider-quality positron acceleration in plasma · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Collider-quality positron acceleration in plasma
Plain
The usual plasma wake focuses electrons but pushes positrons apart, so positrons cannot be accelerated in it with good quality. A collider needs both, and no scheme yet works for positrons in experiment.
Precise · changed · core
Revision 1: In the nonlinear blowout regime, plasma electrons are expelled and the ion column focuses electrons but defocuses positrons. Find a wake configuration (hollow channel, finite-radius plasma, electron filament, magnetized wake, quasi-linear wake) that simultaneously gives gradient above $1e7\,\mathrm{eV}/\mathrm{cm}$, energy-transfer efficiency above 30 percent, rms energy spread below 1 percent and collider-level emittance preservation. An answer is a demonstrated configuration or a proof that the requirements are incompatible.
Revision 2: In the nonlinear blowout regime, plasma electrons are expelled and the ion column focuses electrons but defocuses positrons. Find a wake configuration (hollow channel, finite-radius plasma, electron filament, magnetized wake, quasi-linear wake) that simultaneously gives gradient above $10^{7}\,\mathrm{eV}/\mathrm{cm}$, energy-transfer efficiency above 30 percent, rms energy spread below 1 percent and collider-level emittance preservation. An answer is a demonstrated configuration or a proof that the requirements are incompatible.
Settled by
An experiment accelerating a positron bunch meeting all four metrics simultaneously.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
open
Status note
Several schemes meet subsets of the requirements in simulation (2023-2026, e.g. magnetized wakes, arXiv:2608.30455); none meets all in experiment.
Posed since
(empty)

Decisions