In this work we present the design, assembly and characterization of a tandem photoelectrochemical (PEC) cell based on two different crystallographic phases sub-stoichiometric copper telluride nanocrystals (NCs). The first one, pseudo-cubic phase, pc-Cu2-xTe, is characterized by positive photocurrents, while second hexagonal h-Cu2-xTe, favors negative ones. Taking advantage optoelectronic prope...

The Argonne Wake®eld Accelerator (AWA) is a new facility for advanced accelerator research. A major component of the AWA is its drive linac, consisting of a unique high current short pulse L-Band photocathode based gun and special standing wave preaccelerator designed to produce 100 nC, 30 ps electron bunches at 20 MeV. Commissioning on the drive linac is now underway. We report on our initial ...

An extension of W.. Willis’ Switched Power Linac is studied. Pulsed laser light falls on a photocathode wire, or wires, within a simple resonant structure. The resulting pulsed electron current between the wire and the structure wall drives the resonant field, and rf energy is extracted in the mm to cm wavelength range. Various geometries are presented, including one consisting of a simple arra...

We have developed a two-macroparticle bunch to explore the longitudinal beam dynamics through various components of the Fermilab/NICADD photoinjector. Such a two-macroparticle bunch is generated by splitting the ultraviolet pulse from the photocathode drive laser. The presented method allows the exploration of radiofrequency-induced compression in the 1.625 cell rf-gun and the booster cavity. I...

The Argonne Wakefield Accelerator is presently operational and nearing completion of its initial dielectric structureand plasma-based experimental program. In this paper a number of possible future improvements and directions for the AWA are discussed including photocathode source upgrades, laser pulse and beam shaping options, multiple drive bunch generation, and novel wakefield device measure...

6630: " ere's plenty of room at the top ") and carried out at the Semiconductor e cover shows images of UV light recorded with a Timepix chip (chapter 5). To do this an InGrid detector structure and a CsI photocathode have been post-processed onto the IC. e background that is used on the cover is an image of patterns in porous alumina, a material that has been investigated for the structures...

The BNL Laser-Electron Accelerator Facility (LEAF) uses a laser-pulsed photocathode, radio-frequency electron gun to generate ù7 ps pulses of 8.7 MeV electrons for pulse radiolysis experiments. The compact and operationally simple accelerator system includes synchronized laser pulses that can be used to probe or excite the electron-pulsed samples to examine the dynamics and reactivity of chemic...

The influence of diamond like carbon films properties on quantum efficiency of prepared transmission photocathodes has been investigated. DLC films were deposited on silicon substrate and stainless steel mesh by PECVD using methane, argon and hydrogen or deuterium gas mixtures. Photocathodes prepared with deuterated DLC film have higher quantum efficiency than photocathodes prepared with hydrog...