8 research outputs found
Higher Order Modes Simulation and Measurements for 2400 MHz Cavity
In the frameworks of the High Luminosity LHC
upgrade program an application of additional harmonic
cavities operating at multiples of the main RF system
frequency of 400 MHz is currently under discussion. The
800 MHz superconducting cavities with grooved beam
pipes were suggested as one of the design options. A
scaled aluminum prototype with a frequency of the
operational mode of 2400 MHz was manufactured for
testing the results of simulations. The load reflection
coefficient measurements were performed as well as the
Qload measurements for cavities with the load. Here we
discuss the prototype design and report the obtained
measurement results
A MHz-repetition-rate hard X-ray free-electron laser driven by a superconducting linear accelerator
International audienceThe European XFEL is a hard X-ray free-electron laser (FEL) based on a high-electron-energy superconducting linear accelerator. The superconducting technology allows for the acceleration of many electron bunches within one radio-frequency pulse of the accelerating voltage and, in turn, for the generation of a large number of hard X-ray pulses. We report on the performance of the European XFEL accelerator with up to 5,000 electron bunches per second and demonstrating a full energy of 17.5 GeV. Feedback mechanisms enable stabilization of the electron beam delivery at the FEL undulator in space and time. The measured FEL gain curve at 9.3 keV is in good agreement with predictions for saturated FEL radiation. Hard X-ray lasing was achieved between 7 keV and 14 keV with pulse energies of up to 2.0 mJ. Using the high repetition rate, an FEL beam with 6 W average power was created