Since the initial development of charged particle colliders in the middle of the 20th century,
these advanced scientific instruments have been at the forefront of scientific discoveries in …

Pluridirectional high-energy agile scanning electronic radiotherapy (PHASER) is next-
generation medical linac technology for ultra-rapid highly conformal image-guided radiation …

We report the experimental demonstration of a mm-wave electron accelerating structure
powered by a high-power rf source. We demonstrate reliable coupling of an unprecedented …

Vacuum radio-frequency (rf) breakdown is one of the major factors that limit operating
accelerating gradients in rf particle accelerators. The occurrence of rf breakdowns was …

Ultrashort electron beams with a narrow energy spread, high charge, and low jitter are
essential for resolving phase transitions in metals, semiconductors, and molecular crystals …

Recent studies of the performance of radio-frequency (rf) copper cavities operated at
cryogenic temperatures have shown a dramatic increase in the maximum achievable …

We introduce a solution for producing ultrashort (∼ fs) high charge (∼ pC) from
ultracompact guns utilizing single-cycle THz pulses. We show that the readily available THz …

Cyclic thermal stresses produced by rf pulsed heating can be the limiting factor on the
attainable reliable gradients for room temperature linear accelerators. This is especially true …

We are exploring the physics and frequency-scaling of vacuum rf breakdowns at sub-THz
frequencies. We present the experimental results of rf tests performed in metallic mm-wave …

This paper reviews the current state-of-the-art in understanding the phenomena of ultra-high
vacuum radio-frequency (rf) breakdown in accelerating structures and the efforts to improve …