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A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures
It has been technically challenging to efficiently couple external radiofrequency (RF) power to cylindrical dielectric-loaded accelerating (DLA) structures. This is especially true when the DLA structure has a high dielectric constant. This contribution presents a novel design of a matching section...
Autores principales: | , , , , , , , , , |
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Lenguaje: | eng |
Publicado: |
JACoW
2021
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.18429/JACoW-IPAC2021-MOPAB142 http://cds.cern.ch/record/2807550 |
_version_ | 1780973054203002880 |
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author | Wei, Yelong Bursali, Hikmet Catalán Lasheras, Nuria Freemire, Ben González Antón, Sergio Grudiev, Alexej Jing, Chunguang Sauza-Bedolla, Joel Wegner, Rolf Welsch, Carsten P |
author_facet | Wei, Yelong Bursali, Hikmet Catalán Lasheras, Nuria Freemire, Ben González Antón, Sergio Grudiev, Alexej Jing, Chunguang Sauza-Bedolla, Joel Wegner, Rolf Welsch, Carsten P |
author_sort | Wei, Yelong |
collection | CERN |
description | It has been technically challenging to efficiently couple external radiofrequency (RF) power to cylindrical dielectric-loaded accelerating (DLA) structures. This is especially true when the DLA structure has a high dielectric constant. This contribution presents a novel design of a matching section for coupling the RF power from a circular waveguide to an X-band DLA structure with a dielectric constant ε_{r}=16.66 and a loss tangent \tanθ = 3.43× 10⁻⁵. It consists of a very compact dielectric disk with a width of 2.035 mm and a tilt angle of 60 degrees, resulting in a broadband coupling at a low RF field which has the potential to survive in the high-power environment. To prevent a sharp dielectric corner break, a 45-degree chamfer is added. Moreover, a microscale vacuum gap, caused by metallic clamping between the thin coating and the outer thick copper jacket, is studied in detail. Based on simulation studies, a prototype of the DLA structure with the matching sections was fabricated. Results from preliminary bench measurements and their comparison with design values will also be discussed. |
id | cern-2807550 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2021 |
publisher | JACoW |
record_format | invenio |
spelling | cern-28075502022-04-26T18:30:00Zdoi:10.18429/JACoW-IPAC2021-MOPAB142http://cds.cern.ch/record/2807550engWei, YelongBursali, HikmetCatalán Lasheras, NuriaFreemire, BenGonzález Antón, SergioGrudiev, AlexejJing, ChunguangSauza-Bedolla, JoelWegner, RolfWelsch, Carsten PA Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating StructuresAccelerators and Storage RingsIt has been technically challenging to efficiently couple external radiofrequency (RF) power to cylindrical dielectric-loaded accelerating (DLA) structures. This is especially true when the DLA structure has a high dielectric constant. This contribution presents a novel design of a matching section for coupling the RF power from a circular waveguide to an X-band DLA structure with a dielectric constant ε_{r}=16.66 and a loss tangent \tanθ = 3.43× 10⁻⁵. It consists of a very compact dielectric disk with a width of 2.035 mm and a tilt angle of 60 degrees, resulting in a broadband coupling at a low RF field which has the potential to survive in the high-power environment. To prevent a sharp dielectric corner break, a 45-degree chamfer is added. Moreover, a microscale vacuum gap, caused by metallic clamping between the thin coating and the outer thick copper jacket, is studied in detail. Based on simulation studies, a prototype of the DLA structure with the matching sections was fabricated. Results from preliminary bench measurements and their comparison with design values will also be discussed.JACoWoai:cds.cern.ch:28075502021 |
spellingShingle | Accelerators and Storage Rings Wei, Yelong Bursali, Hikmet Catalán Lasheras, Nuria Freemire, Ben González Antón, Sergio Grudiev, Alexej Jing, Chunguang Sauza-Bedolla, Joel Wegner, Rolf Welsch, Carsten P A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures |
title | A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures |
title_full | A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures |
title_fullStr | A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures |
title_full_unstemmed | A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures |
title_short | A Compact, Low-Field, Broadband Matching Section for Externally-Powered X-Band Dielectric-Loaded Accelerating Structures |
title_sort | compact, low-field, broadband matching section for externally-powered x-band dielectric-loaded accelerating structures |
topic | Accelerators and Storage Rings |
url | https://dx.doi.org/10.18429/JACoW-IPAC2021-MOPAB142 http://cds.cern.ch/record/2807550 |
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