When electron beams traverse an accelerating structure, higher order modes (HOMs) are excited. They can be used for beam diagnostic purposes. Both 1.3 GHz and 3.9 GHz superconducting accel erating cavities at FLASH linac, DESY, are equipped with electronics for beam pos...

The CERN Large Hadron Collider (LHC) is designed to accelerate and bring into collision high-energy protons as well as heavy ions. Accidents involving direct beam impacts on collimators can happen in both cases. The LHC collimation system is designed to handle the deman...

Comment: 7 pages, 7 figures, 2 tables

<p>Chains of superconducting radio-frequency resonators are key components of modern particle accelerators such as the European XFEL, which is currently under construction in the north of Germany. In addition to the accelerating mode of the resonators, their beam excite...

Modern particle accelerators and their applications increasingly rely on precisely coordinated interactions of intense charged particle and laser beams. Femtosecond-scale synchronization alongside micrometre-scale spatial precision are essential e.g. for pump-probe expe...

The European XFEL (E-XFEL) is being fabricated in Hamburg to serve as an X-ray Free Electron Laser light source. The electron beam will be accelerated through linacs consisting of 1.3 GHz superconducting cavities along a length of 2.1 km. In addition, third harmonic cav...

In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a h...

– A brief introduction to the European XFEL and Higher Order Modes– Principle of beam phase determination– Simulations with circuit model– Measurements with a broadband setup– Summary and Outlook

We regret the oversight of not acknowledging the significant amount of work by several colleagues in the field (see [1–4]and references therein). In particular, we would like to highlight the work performed at the Istituto Nazionale di FisicaNucleare (INFN) for the real...