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Title: Laboratory pair plasma with measurable collective effects
Plain: For the pairs from a cascade to act as a true plasma, they must be dense enough to respond together to fields. The question is whether existing lasers and electron beams can produce such a pair plasma and show its collective behavior.
Precise: Pairs created by beam-laser or laser-laser cascades act collectively only if the relativistic pair plasma frequency exceeds the inverse interaction time; Qu, Meuren and Fisch (2021) predict a measurable blue shift of the laser frequency as a signature. Determine whether the frequency upshift, or another collective signature such as field screening or plasma-wave emission, can be measured with existing multi-PW lasers and 10 GeV-class electron beams, and give the expected magnitude and required detection resolution.
Settled by: An experiment measuring laser spectral upshift or another collective signature that scales with pair density as predicted.
Kind: well-posed
Answer type: yes-no
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)