Minimization of power consumption during charging of superconducting accelerating cavities
2015 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 801, 78-85 p.Article in journal (Refereed) Published
The radio frequency cavities, used to accelerate charged particle beams, need to be charged to their nominal voltage after which the beam can be injected into them. The standard procedure for such cavity filling is to use a step charging profile. However, during initial stages of such a filling process a substantial amount of the total energy is wasted in reflection for superconducting cavities because of their extremely narrow bandwidth. The paper presents a novel strategy to charge cavities, which reduces total energy reflection. We use variational calculus to obtain analytical expression for the optimal charging profile. Enemies, reflected and required, and generator peak power are also compared between the charging schemes and practical aspects (saturation, efficiency and gain characteristics) of power sources (tetrodes, IOTs and solid state power amplifiers) are also considered and analysed. The paper presents a methodology to successfully identify the optimal charging scheme for different power sources to minimize total energy requirement.
Place, publisher, year, edition, pages
2015. Vol. 801, 78-85 p.
Superconducting cavity, Optimization, IOT, Tetrode, Doherty architecture, Solid-state
Accelerator Physics and Instrumentation
IdentifiersURN: urn:nbn:se:uu:diva-265660DOI: 10.1016/j.nima.2015.07.056ISI: 000362282200012OAI: oai:DiVA.org:uu-265660DiVA: diva2:867486