Electron-bunch bunching factor as a function of modulation frequency and electron-bunch energy resulting from a cascaded longitudinal space-charge amplifier (A. Halavanau, NIU, 2015).

Frequency-resolved optical gating (FROG) measurement of the HBESL amplifier infrared laser pulse [left: measured FROG pattern, right: retrieved electric-field amplitude and phase] (H. Panuganti, NIU, 2015).

Carbon-Nanotube field-emission cathode for Ampere-class electron-beam generation (R. Hahn, Fermilab, 2014).

Harsha Panuganti next to the HBESL radiofrequency electron source (R. Hahn, Fermilab, 2014).

Harsha Panuganti in the HBESL laser room operating the IDESTA-QE Ti:Sapph laser oscillator (R. Hahn, Fermilab, 2014).

Harsha Panuganti in the HBESL laser room working on the Spectra-Physics Spitfire Ti:Sapph laser amplifier. The laser is turned off in this picture (R. Hahn, Fermilab, 2014).

Evolution of a non-ultrarelativistic electron-bunch density after self-bunching downstream of a dielectric-lined waveguide (F. Lemery, NIU, 2014, Electronic cover "Kaleidoscope" of Physical Review Special Topics Accelerator and Beams, 2014).

Francois Lemery explaining dielectric acceleration to Congressman Hultgren and NIU President Douglas Baker (R. Hahn, Fermilab 08-20-2013).

Ben Blomberg explaining channeling radiation to Congressman Hultgren and NIU President Douglas Baker (R. Hahn, Fermilab 08-20-2013).

Christopher Prokop explaining emittance exchangers to Congressman Hultgren and NIU President Douglas Baker (R. Hahn, Fermilab 08-20-2013).

Longitudinal electric wakefield excited by a bunch in a dielectric slab structure. (D. Mihalcea, NIU, 2012, Electronic cover "Kaleidoscope" of Physical Review Special Topics Accelerator and Beams, 2012). .

Electron emission from field-emission cathode with gating anode. The simulations were performed with VORPAL and the visualization with VorpalView (P. Piot, NIU-Fermilab, 2012).

Measured twin-bunch electron density via single-shot electro-optical imaging. The twin bunches are produce via transverse-to-longitudinal imaging (Timothy Maxwell's, NIU Dissertation, 2011).

electromagnetic field painted on a dielectric-lined waveguide. The simulations were performed with VORPAL and the visualization with Visit (P. Piot, NIU-Fermilab, 2011).