Andrew James Goers

Andrew James Goers
University of Maryland, College Park | UMD, UMCP, University of Maryland College Park · Institute for Research in Electronics and Applied Physics (IREAP)

About

17
Publications
1,142
Reads
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235
Citations
Citations since 2016
9 Research Items
221 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040

Publications

Publications (17)
Article
We present the design and characterization of a thin, high density pulsed gas jet for use in the study of near critical laser plasma interactions with ultrashort Ti:sapphire laser pulses. The gas jet uses a range of capillary nozzles with inner diameters between 50 and 150 μm and is operated in the sonic regime. Cryogenic cooling of the gas valve b...
Article
Full-text available
The injection of electrons into a laser wakefield accelerator (LWFA) is observed to generate an intense coherent ultra-broadband and ultrashort pulse radiation flash, consistent with the acceleration of electrons from rest to nearly the speed of light in a distance <∼1μm. Under certain conditions, the radiation occurs at harmonics of the local plas...
Preprint
The injection of electrons into a laser wakefield accelerator (LWFA) is observed to generate an intense coherent ultra-broadband and ultrashort pulse radiation flash, consistent with the acceleration of electrons from rest to nearly the speed of light in a distance < ~ 1 {\mu}m. The flash is sufficiently bright to induce large nonlinear refractive...
Article
In this erratum the funding section of Opt. Lett.42, 215 (2017)OPLEDP0146-959210.1364/OL.42.000215 has been updated.
Article
Full-text available
We demonstrate laser-driven acceleration of electrons to MeV-scale energies at 1 kHz repetition rate using <10 mJ pulses focused on near-critical density He and H2 gas jets. Using the H2 gas jet, electron acceleration to ∼0.5 MeV in ∼10 fC bunches was observed with laser pulse energy as low as 1.3 mJ. Increasing the pulse energy to 10 mJ, we measur...
Conference Paper
Ionization injection-assisted laser wakefield acceleration of electrons up to 120 MeV is demonstrated in a 1.5mm long pure helium-like nitrogen plasma waveguide. The guiding structure stabilizes the high energy electron beam pointing and reduces the beam divergence. Our results are confirmed by 3-D particle-in-cell simulations.
Article
Full-text available
We demonstrate laser driven acceleration of electrons to MeV-scale energies at 1kHz repetition rate using <10mJ pulses focused on near-critical density He and H2 gas jets. Using the H2 gas jet, electron acceleration to ~0.5MeV in ~10fC bunches was observed with laser pulse energy as low as 1.3mJ. Increasing the pulse energy to 10mJ, we measure ~1pC...
Article
We demonstrate the generation of axially modulated plasma waveguides using spatially patterned high-energy laser pulses. A spatial light modulator (SLM) imposes transverse phase front modulations on a low-energy (10 mJ) laser pulse which is interferometrically combined with a high-energy (130-450 mJ) pulse, sculpting its intensity profile. This ena...
Article
Full-text available
We demonstrate laser-plasma acceleration of high charge electron beams to the ~10 MeV scale using ultrashort laser pulses with as little energy as 10 mJ. This result is made possible by an extremely dense and thin hydrogen gas jet. Total charge up to ~0.5 nC is measured for energies >1 MeV. Acceleration is correlated to the presence of a relativist...
Conference Paper
We examine the interaction of relativistic laser pulses with plasma channels formed in a nitrogen cluster jet. We observe creation of nearly pure N5+ plasma channels and ionization injected wakefield beams with energies >100 MeV.
Article
Ionization injection-assisted laser wakefield acceleration of electrons up to 120 MeV is demonstrated in a 1.5 mm long pure helium-like nitrogen plasma waveguide. The guiding structure stabilizes the high energy electron beam pointing and reduces the beam divergence. Our results are confirmed by 3D particle-in-cell simulations.
Conference Paper
Plasma guiding structures are generated with programmable axial density modulations using a Spatial Light Modulator (SLM). A coherent beam-combining scheme enables the sculpting of high power beams with modest energy passing through the SLM.
Article
Full-text available
We examine the generation of axially modulated plasmas produced from cluster jets whose supersonic flow is intersected by thin wires. Such plasmas have application to modulated plasma waveguides. By appropriately limiting shock waves from the wires, plasma axial modulation periods can be as small as 70 mu m, with plasma structures as narrow as 45 m...
Conference Paper
We examine the generation of plasma waveguides generated from cluster jets whose supersonic flow is intersected by a periodic array of wires. We find that the minimum modulation period is dictated by shock waves launched off the wires by residual monomer gas. This effect is reduced with increased cluster size accompanied by a reduced monomer compon...
Article
Modulated plasma waveguides have been proposed as a means of quasi-phase matching laser plasma interactions for applications including direct acceleration of electrons by a high intensity laser pulse. We have demonstrated a technique for axially modulating plasma waveguides by periodically obstructing gas flow out of a cluster jet using an array of...
Conference Paper
As atomic clusters explode and ionize under irradiation by an intense femtosecond laser pulse, a transient positive contribution to the index of refraction can result from the transition from a supercritical to subcritical plasma [1]. This effect has been used to self-focus intense laser pulses[2], but has not yet been examined in the relativistic...

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