talks

Plenary Talk — Advanced Accelerator Concepts Workshop (AAC24)

Latest results on PWFA experiments from FACET-II · Naperville, IL, USA · July 2024

FACET-II is a national user facility that offers a unique capability for developing advanced acceleration and coherent radiation generation techniques using high-energy electron beams. This plenary presented the latest results from plasma wakefield acceleration experiments at FACET-II: evidence of energy depletion of the 10 GeV drive beam and efficient beam-to-wake energy transfer in both beam-ionized and laser-preionized plasmas; machine-learning-enabled beam tuning to increase drive beam density; generation of >20 GeV electron bunches with small energy spread and emittance via density downramp injection; multi-GeV, multi-color electron beams via ionization injection; and first experimental attempts at beam matching and two-bunch PWFA.

Invited Talk — 51st IEEE International Conference on Plasma Science (ICOPS)

High-efficiency wake excitation in meter-scale beam-ionized hydrogen plasmas at FACET-II · Beijing, China · June 2024

Results from the E300 collaboration at FACET-II addressing the repetition-rate and energy-efficiency requirements of future plasma-based linear colliders: meter-scale plasmas generated by self-ionizing a continuous hydrogen gas flow with 10 GeV electron bunches, the onset of pump depletion at pressures ≥1.5 Torr, and particle-in-cell simulations indicating beam-to-wake energy transfer efficiency of approximately 60% at ~2 Torr.

Invited Talk — 63rd APS Division of Plasma Physics Meeting

Measurements of Weibel magnetic fields in optical-field ionized plasmas · Pittsburgh, PA, USA · November 2021

Time-resolved measurements of Weibel-instability magnetic fields in plasmas produced by optical field ionization, using an external ultrashort relativistic electron probe. The fields self-organize into a quasistatic helicoid structure within a few picoseconds and persist for tens of picoseconds; measured growth rates and saturated magnitudes agree with kinetic theory predictions.

Plenary Talk — Advanced Accelerator Concepts Workshop (AAC16)

Probing plasma wakefield using femtosecond relativistic electron bunches · National Harbor, MD, USA · August 2016

One of the first presentations of femtosecond relativistic electron probing (FREP), introducing the technique of using femtosecond relativistic electron bunches to visualize plasma wakefields with unprecedented spatiotemporal resolution. The techniques presented here have since triggered extensive follow-up research at international institutes, including ATF at BNL and the Weizmann Institute of Science.

A complete list of invited seminars and colloquia is available in my CV.