IAC, Pocatello, IDAHO, USA
ISU, Pocatello, Idaho, USA
RadiaBeam, Santa Monica, USA
RadiaBeam, Santa Monica, USA
UCLA, Los Angeles, USA
RadiaBeam Technologies is developing carbon nanotube (CNT) based field emission cathodes for DC-pulsed and radio-frequency electron sources. CNT cathodes offer simple operation, have demonstrated high current densities, and can maintain low thermal emittance due to their ability to emit at room temperature. The experimental results of high-voltage and lifetime testing of CNT cathodes are presented. There is also a brief summary of a planned experiment in a dual-frequency RF gun. Additionally, some of the challenges posed by the fabrication and handling of the CNT cathodes are discussed.
UCLA, Los Angeles, USA
RadiaBeam, Santa Monica, USA
RadiaBeam, in collaboration with UCLA, is developing an innovative, inexpensive, low-energy ultra-fast electron diffraction (UED) system which allows us to reconstruct a single ultrafast event with a single pulse of electrons. Time resolved measurement of atomic motion is one of the frontiers of modern science, and advancements in this area will greatly improve our understanding of the basic processes in materials science, chemistry and biology. The high-frequency (GHz), high voltage, phase-locked RF field in the deflector allows temporal resolution as fine as sub-100 fs. In this paper, we show the complete design of the UED system based on this concept, including initial beam measurements.
RadiaBeam, Santa Monica, USA
IAC, Pocatello, IDAHO, USA
Planar gratings structure for generation of mm-sub-mm wavelength long-range wakefields is analyzed. The rugged, side-open, slow wave structure can sustain substantial beam loading including long multi-bunch trains up to CW operation. Electromagnetic performance of the structure is characterized numerically vs. experiment with emphasis to application to flat beams. It is shown that such an electrically wide, wavelength-gap structure can operate at significantly reduced tolerances whereas substantial flatness of the wakefield can be obtained at essentially non-flat eigenmode profile.
THOAA2
RadiaBeam, Santa Monica, USA
Radioisotope sources are commonly used in a variety of industrial and medical applications. The US National Research Council has identified as a priority the replacement of high-activity sources with alternative technologies, due to the risk of accidents and diversion by terrorists for use in Radiological Dispersal Devices (“dirty bombs”). RadiaBeam Technologies is developing novel, compact, inexpensive linear accelerators for use in a variety of such applications as cost-effective replacements. The technology is based on the MicroLinac (originally developed at SLAC), an X-band linear accelerator powered by an inexpensive and commonly available magnetron. Prototypes are currently under construction. This paper will describe the design, engineering, fabrication and testing of these linacs at RadiaBeam. Future development plans will also be discussed.
RadiaBeam, Santa Monica, USA
Undulator-free schemes based on resonant Cherenkov radiation in a small insertion device driven by a few MeV RF electron injector and alpha-magnet are considered. S- and C-band RF guns are compared to X-band multi-cell microlinac. Preference is given to planar radiator and wide quasi-flat sub-ps bunches that can be obtained with alpha magnet. It is shown that up to a millijoule of sub-THz energy can be produced within a macropulse.