Design of high gradient, high repetition rate damped C-band rf structures
The gamma beam system of the European Extreme Light Infrastructure–Nuclear Physics project foresees the use of a multibunch train colliding with a high intensity recirculated laser pulse. The linac energy booster is composed of 12 traveling wave C-band structures, 1.8 m long with a field phase advan...
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2017-03-01
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Series: | Physical Review Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.20.032004 |
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doaj-eaf6aa78cdea4bf5848929a1048e18262020-11-24T22:40:32ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882017-03-0120303200410.1103/PhysRevAccelBeams.20.032004Design of high gradient, high repetition rate damped C-band rf structuresDavid AlesiniMarco BellavegliaSimone BiniAlessandro GalloValerio LolloLuigi PellegrinoLuca PiersantiFabio CardelliMauro MiglioratiAndrea MostacciLuigi PalumboSimone TocciLuca FiccadentiValerio PettinacciThe gamma beam system of the European Extreme Light Infrastructure–Nuclear Physics project foresees the use of a multibunch train colliding with a high intensity recirculated laser pulse. The linac energy booster is composed of 12 traveling wave C-band structures, 1.8 m long with a field phase advance per cell of 2π/3 and a repetition rate of 100 Hz. Because of the multibunch operation, the structures have been designed with a dipole higher order mode (HOM) damping system to avoid beam breakup (BBU). They are quasiconstant gradient structures with symmetric input couplers and a very effective damping of the HOMs in each cell based on silicon carbide (SiC) rf absorbers coupled to each cell through waveguides. An optimization of the electromagnetic and mechanical design has been done to simplify the fabrication and to reduce the cost of the structures. In the paper, after a review of the beam dynamics issues related to the BBU effects, we discuss the electromagnetic and thermomechanic design criteria of the structures. We also illustrate the criteria to compensate the beam loading and the rf measurements that show the effectiveness of the HOM damping.http://doi.org/10.1103/PhysRevAccelBeams.20.032004 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
David Alesini Marco Bellaveglia Simone Bini Alessandro Gallo Valerio Lollo Luigi Pellegrino Luca Piersanti Fabio Cardelli Mauro Migliorati Andrea Mostacci Luigi Palumbo Simone Tocci Luca Ficcadenti Valerio Pettinacci |
spellingShingle |
David Alesini Marco Bellaveglia Simone Bini Alessandro Gallo Valerio Lollo Luigi Pellegrino Luca Piersanti Fabio Cardelli Mauro Migliorati Andrea Mostacci Luigi Palumbo Simone Tocci Luca Ficcadenti Valerio Pettinacci Design of high gradient, high repetition rate damped C-band rf structures Physical Review Accelerators and Beams |
author_facet |
David Alesini Marco Bellaveglia Simone Bini Alessandro Gallo Valerio Lollo Luigi Pellegrino Luca Piersanti Fabio Cardelli Mauro Migliorati Andrea Mostacci Luigi Palumbo Simone Tocci Luca Ficcadenti Valerio Pettinacci |
author_sort |
David Alesini |
title |
Design of high gradient, high repetition rate damped C-band rf structures |
title_short |
Design of high gradient, high repetition rate damped C-band rf structures |
title_full |
Design of high gradient, high repetition rate damped C-band rf structures |
title_fullStr |
Design of high gradient, high repetition rate damped C-band rf structures |
title_full_unstemmed |
Design of high gradient, high repetition rate damped C-band rf structures |
title_sort |
design of high gradient, high repetition rate damped c-band rf structures |
publisher |
American Physical Society |
series |
Physical Review Accelerators and Beams |
issn |
2469-9888 |
publishDate |
2017-03-01 |
description |
The gamma beam system of the European Extreme Light Infrastructure–Nuclear Physics project foresees the use of a multibunch train colliding with a high intensity recirculated laser pulse. The linac energy booster is composed of 12 traveling wave C-band structures, 1.8 m long with a field phase advance per cell of 2π/3 and a repetition rate of 100 Hz. Because of the multibunch operation, the structures have been designed with a dipole higher order mode (HOM) damping system to avoid beam breakup (BBU). They are quasiconstant gradient structures with symmetric input couplers and a very effective damping of the HOMs in each cell based on silicon carbide (SiC) rf absorbers coupled to each cell through waveguides. An optimization of the electromagnetic and mechanical design has been done to simplify the fabrication and to reduce the cost of the structures. In the paper, after a review of the beam dynamics issues related to the BBU effects, we discuss the electromagnetic and thermomechanic design criteria of the structures. We also illustrate the criteria to compensate the beam loading and the rf measurements that show the effectiveness of the HOM damping. |
url |
http://doi.org/10.1103/PhysRevAccelBeams.20.032004 |
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