Development of high‑energy electron polarimetry for laser‑plasma accelerators

Develop and demonstrate Mott-, Møller-, or laser‑Compton polarimeters compatible with laser‑plasma accelerator conditions to measure the polarization of electron beams at energies of 100 MeV and above, where Compton transmission polarimetry becomes impractical.

Background

For laser‑plasma accelerated electron beams at energies above ~100 MeV, Compton transmission polarimetry loses effectiveness due to decreasing asymmetries. Although alternative methods such as Mott, Møller, or laser‑Compton polarimetry are standard in conventional accelerators, suitable instruments adapted to the challenging time structure and electromagnetic environment of laser‑plasma experiments have not yet been developed.