Sep 24 – 30, 2017
La Biodola, Isola d'Elba
Europe/Rome timezone

MeV electron beams at 1 kHz

Sep 28, 2017, 9:00 AM
SML, Sala Maria Luisa, Hotel Hermitage

SML, Sala Maria Luisa, Hotel Hermitage

talk Invited Plenary Talk Plenary 7


Prof. Howard Milchberg (University of Maryland)


We show that using high density gas jet targets approaching critical density makes possible electron acceleration to relativistic energies with low laser pulse energies, enabling high repetition rate operation. The near-critical density is approached in two ways. For 30 fs, lambda= 800nm, <10 mJ pulses from a 1 kHz Ti:Sapphire laser, we used cryo-cooled, continuous flow high density H_2 and He jets, with N_e/N_cr < 0.69. And in the first laser wakefield experiments using ultrashort mid-infrared laser pulses (100fs, lambda= 3.9um, <20 mJ pulses from a mid-IR OPCPA system), the non-cryo-cooled target density reaches N_e/N_cr < 2.2. In both experiments, the high electron density enables onset of relativistic self-focusing and few MeV electron acceleration at millijoule-scale laser energies. In the case of the mid-IR laser driver, we image the onset and scaling of relativistic self-focusing from single filament collapse through the multifilamentation regime.

Primary author

Prof. Howard Milchberg (University of Maryland)

Presentation materials