The dual-mode double-gap resonator with asymmetrrical strip line on the suspended ceramic substrate
A new dual-mode double-gap resonator on the basis of asymmetrical suspended stripline for miniature klystron type microwave tubes with field emitter arrays (FEA) cathodes was investigated. The resonator has a smaller size and mass when a doublegap capacitive segment of each quasi-lumped resonator consists of two assimmetrical strip conductors on opposite sides of the substrate and both inductive segments are grounded. This resonance circuit has two oscillation modes (anti-phase and in-phase). On the basis of the 3-D modeling found that such oscillatory systems can achieve the excitation of these modes with multiplicity of frequencies to = 2 with a good efficiency of interaction of electrons with microwave fields.
A double‐gap klystron type resonator with inductive quasi‐fractal elements
Electrodynamic characteristics and parameters of the double‐gap klystron resonator with the inductive microstrip elements on the suspended ceramic substrate has been investigated. The inductive part of a resonator made on the basis of a quasi‐fractal Sierpinski's triangle, and a capacitor part, made between end faces of the multi‐channel drift tubes and forming a double gridless gap. The developed resonator can find application in micro vacuum klystron devices working in the systems of telecommunication and navigation in 1‐ and multi‐frequency mode of operation.
The REX-ISOLDE project
The Radioactive Beam Experiment REX-ISOLDE [1–3] is a pilot experiment at ISOLDE (CERN) testing the new concept of post acceleration of radioactive ion beams by using charge breeding of the ions in a high charge state ion source and the efficient acceleration of the highly charged ions in a short LINAC using modern ion accelerator structures. In order to prepare the ions for the experiments singly charged radioactive ions from the on-line mass separator ISOLDE will be cooled and bunched in a Penning trap, charge bred in an electron beam ion source (EBIS) and finally accelerated in the LINAC. The LINAC consists of a radiofrequency quadrupole (RFQ) accelerator, which accelerates the ions up to 0.3 MeV/u, an interdigital H-type (IH) structure with a final energy between 1.1 and 1.2 MeV/u and three seven gap resonators, which allow the variation of the final energy. With an energy of the radioactive beams between 0.8 MeV/u and 2.2 MeV/u a wide range of experiments in the field of nuclear spectroscopy, astrophysics and solid state physics will be addressed by REX-ISOLDE.