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Metamaterial-Based Absorbers for the Reduction of Accelerator Beam-Coupling Impedance.
- Source :
- IEEE Transactions on Microwave Theory & Techniques; Apr2020, Vol. 68 Issue 4, p1340-1346, 7p
- Publication Year :
- 2020
-
Abstract
- Resistive-wall impedance constitutes a significant percentage of the total beam-coupling impedance budget of an accelerator. A number of different reduction techniques have been proposed during the years depending on the specific applications, ranging from higher order modes damping to solutions entailing high electrical-conductivity coatings of the pipe. This article investigates the use of metamaterial-based absorbers for sensibly reducing or nearly canceling the beam-coupling impedance. We design and fabricate subwavelength 2-D metallic resonant structures based on the split-ring resonator (SRR) geometry that can be employed as mode dampers in accelerating structures. A number of prototypes have been fabricated and measured in a “test model” pillbox cavity. Experimental results, combined with full-wave electromagnetic simulations, prove the efficiency of the SRR-based metamaterials. This article opens up to the possibility of considering metamaterials as a valid alternative to other devices for impedance mitigation in experimental setups commonly operating along a particle beamline, such as accelerating cavities or collimators, and more in general for the development of filters with a large out-of-band signal rejection in specific applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- METAMATERIALS
PARTICLE accelerators
COLLIMATORS
RESONATORS
Subjects
Details
- Language :
- English
- ISSN :
- 00189480
- Volume :
- 68
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Microwave Theory & Techniques
- Publication Type :
- Academic Journal
- Accession number :
- 143313805
- Full Text :
- https://doi.org/10.1109/TMTT.2019.2957463