Speaker
Description
High brightness electron beams have a wide range of applications ranging from accelerator-based light sources to ultrafast electron diffraction and microscopy. Brighter beams can be generated by increasing the accelerating gradient on the cathode at the time of photoemission, making high gradient photoinjectors an important tool. One possible path to simultaneously achieve high gradient and suppress breakdowns is to reduce the RF pulse duration fed into the photoinjector to less than 20 ns. This led us to propose the Compressed Ultrashort Pulse Injector Demonstrator (CUPID), a 1.6 cell photogun driven by nanosecond-scale high power rf pulses to achieve high gradients with low breakdown rate. We report on the first high power tests of photogun-like RF cavities designed to harness these short pulses uniquely powered by a new 11.424 GHz SLED-type RF pulse compressor. We present details on the design and fabrication of these cavities along with the experimental setup used to test them. High power tests demonstrated pulses with peak power up to 166 MW per cavity, generating about 400 MV/m on the surface of the cathode. The early conditioning results show a viable route to reaching the high-gradient, ultra-short pulse regime for accelerators and photoinjectors using RF pulse compression.
| Working group | WG4 |
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