In radio frequency (RF) guns with a thermionic cathode, electrons are free to leave the cathode at non-optimal phases of the RF field. These electrons can be accelerated backwards and impact the cathode. Such back-bombardment generates an additional heat load on the gun and cathode, which may… More

The  present design of the International Linear Collider (ILC) calls for the use of a DC gun. If a radio frequency (RF) gun were employed, the pulse profile could be generated by the source laser reducing or eliminating the need for RF bunchers. To enact this scheme, a high electron… More

Energy recovery linacs and other CW accelerators mandate the use of radio frequency (RF) photoinjectors to generate the low emittance, high current, high-peak-charge electrons used in collisions with hadron beams, and for electron cooling of hadron beams. However, RF guns using thermionic cathodes… More

For FEL based systems to become practical as weapons, it is necessary photoinjectors be used to generate the low emittance, high current, high peak charge electrons needed for photon production. Higher overall system reliability can be achieved if the photoemitter operates in the visible wavelength… More

It is likely that next generation electron sources for future accelerators will initially utilize a direct current gun based injector with a semiconductor photocathode for electron production. The goal of this project is to create a recipe or series of recipes that will immunize a photocathode… More

A fundamental issue with high-average-current photoelectron guns is the generation of stray electrons and ions which can damage the photoemitter. Ion back-bombardment of the photoemitter can alter or damage both the photoemitter and the activation layer, resulting in diminished lifetime and poor… More

A fundamental issue with high average current photoelectron guns is the generation of stray electrons and ions which can damage the photoemitter. Free electrons can potentially directly impact the photocathode, desorb molecules from the gun structure and act as ionization agents for background

A fundamental issue with high average current photoelectron guns is the generation of stray electrons and ions which can damage the photoemitter. Both the photogenerated electron bunch and any field emitted electrons can potentially directly impact the photocathode, desorb molecules from the gun… More

A fundamental issue with high average current photoelectron guns is the generation of stray electrons and ions which can damage the photoemitter. Both the photogenerated electron bunch and any field emitted electrons can potentially directly impact the photocathode, desorb molecules from the gun… More

This project will result in investigation and modeling of heat flow in a Bi2Te3-Sb2Te3 superlattice based thermoelectric cooler stack and the development of the series of processes for negative electron affinity activation of the stack substrate as a basis for an advanced sensor cooler in which… More