Journal Article

PUBDB-2017-11907

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Eigenmode Compendium of the Third Harmonic Module of the European X-ray Free Electron Laser

Flisgen, T. (Corresponding author) ; Heller, J. ; Galek, T. ; Shi, L.DESY* ; Joshi, N. ; Baboi, N.-I. (Corresponding author)DESY* ; Jones, R. M. ; van Rienen, U.

2017
American Physical Society College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevAccelBeams.20.042002  doi:10.3204/PUBDB-2017-11907

Abstract: Chains of superconducting radio-frequency resonators are key components of modern particle accelerators such as the European XFEL, which is currently under construction in the north of Germany. In addition to the accelerating mode of the resonators, their beam excited higher order modes are of special interest, because they can harm the beam quality. In contrast to the accelerating mode, these modes are in general not confined within single resonators of the cavity string. For instance, eigenmodes can be localized between adjacent cavities or can be distributed along the entire chain of cavities. Therefore, the full chain has to be considered for a reasonable investigation of its resonant spectra. Accounting for such complex structures is computationally challenging and is therefore often avoided. In this article, the challenge is faced by using the so-called state-space concatenation approach, which is a combination of domain decomposition and model-order reduction. The technique allows for a reduction of the number of degrees of freedom by a factor of ≈ 1.471 × 10^−4. The method is employed to generate a compendium of eigenmodes in the chain of third harmonic cavities for the European XFEL. The results are discussed in detail and are compared with experimental measurements. The compendium serves as a reference for experiments (inter alia for diagnostics based on higher order modes) at the third harmonic cavity string of the European XFEL, it allows for qualitative understanding of resonant effects appearing in chains of cavities, and it is meant to be a proof of principle of the state-space concatenation approach to handle very long and complex radio-frequency structures. To the authors’ knowledge, it is the first time that a modalcompendium of a structure with the given complexity is generated. The article presents geometrical details of the chain, defines quantities relevant to superconducting radio-frequency cavities, and describes the employed computational approach.

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Contributing Institute(s):

1. Diagnose und Instrumentierung (MDI)

Research Program(s):

1. 631 - Accelerator R & D (POF3-631) (POF3-631)
2. 6G13 - XFEL (POF3-622) (POF3-622)
3. EUCARD-2 - Enhanced European Coordination for Accelerator Research & Development (312453) (312453)

Experiment(s):

1. Facility (machine) XFEL

Appears in the scientific report 2017

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article (Erratum/Correction) Flisgen, T. ; Heller, J. ; Galek, T. ; Shi, L.DESY* ; Joshi, N. ; Baboi, N.-I. (Corresponding author)DESY* ; Jones, R. M. ; van Rienen, U.
Erratum: Eigenmode Compendium of the Third Harmonic Module of the European X-ray Free Electron Laser [Phys. Rev. Accel. Beams 20 , 042002 (2017)]
Physical review accelerators and beams 20(7), 079901 (2017) [10.1103/PhysRevAccelBeams.20.079901]2017     Files BibTeX | EndNote: XML, Text | RIS

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