URS, Albuquerque, New Mexico, USA
LANL, Los Alamos, New Mexico, USA
Implementing high-quality measurement systems in large test environments presents a number of unique challenges. And, these challenges are made even more interesting where new instrumentation systems are being implemented in existing legacy environments where there is little opportunity to modify the infrastructure. Often, Electromagnetic Interference (EMI) is encountered. This interference may be simply an annoyance were sufficiently low that data integrity is not severely compromised, but in many cases, perhaps most, EMI is so severe as to totally obscure the signals of interest. Various sources of EMI and common points of entry of are reviewed. Means of mitigation of EMI in the design and implementation of instrumentation systems in legacy environments are presented. Common sources of EMI potentially introduced by the instrumentation systems themselves are examined, and means of design to mitigate such self-induce interference are examined. Real-life examples are provided to demonstrate the EMI issues, and the affect of mitigation. It’s all about the current – pretty much!
GSI, Darmstadt, Germany
AGH University of Science and Technology, Kraków, Poland
Over 50 years in the history of accelerator physics, RF cavities have been used as beam position and intensity monitors. Their structure has been extensively discussed across numerous papers reporting their successful operation. The application of RF cavities as pick-ups has recently been extended to include radioactive ion beam (RIB) facilities and heavy ion storage rings. These pick-ups allow for very sensitive, accurate, and quick characterisation of ion beams and turn out to be indispensable tools in nuclear as well as atomic physics experiments. A notable example is the resonant pick-up in the ESR at GSI Darmstadt (*) where single ion detection was achieved for lifetime measurements of radioactive nuclides (**). A similar cavity pick-up was installed in CSRe in IMP Lanzhou (***). In this work, we describe a novel conceptual approach that utilizes RF cavities with an elliptical geometry. While requiring a high precision determination of the position and intensity of particle beams, it has to cope with design restriction at heavy-ion storage rings such as large beam pipe apertures. The latter become inevitable at facilities aiming at storing large-emittance beams as, e.g., planned in the future Collector Ring (CR) of the FAIR project at GSI Darmstadt. Simulation results are accompanied by results achieved from bench-top measurements on model cavities.
* F. Nolden et. al., NIM A, v 659 No 1 pp 69–77 (2011)
** P. Kienle, F. Bosch et. al., Phys. Lett. B, v 726, 4–5, pp 638–645 (2013)
*** J. X. Wu et. al., NIM B, v 317, pp 623–628 (2013)
