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Generalization of Coupled S-Parameter Calculation to Compute Beam Impedances in Particle Accelerators

Flisgen, Thomas ; Gjonaj, Erion ; Glock, Hans-Walter ; Tsakanian, Andranik (2020):
Generalization of Coupled S-Parameter Calculation to Compute Beam Impedances in Particle Accelerators.
In: Physical Review Accelerators and Beams, 23 (3), APS Physics, ISSN 2469-9888,
DOI: 10.1103/PhysRevAccelBeams.23.034601,
[Article]

Abstract

In this article, a decomposition approach for the computation of beam coupling impedances is proposed. This approach can account for the mutual electromagnetic coupling in long accelerator structures consisting of several consecutive segments. The method is based on the description of the individual segments using a multimodal network matrix formulation in which the charged particle beam is considered as an additional port. Then, the generalized multimodal network matrices of all segments are combined to a multimodal network matrix of the complete structure. The beam coupling impedance as well as the scattering parameters of the full structure are recovered as particular matrix elements in this multimodal network matrix. The new method generalizes Coupled S-Parameter Calculation (CSC) introduced in earlier work such that charged particle beams are considered. Consequently, the introduced scheme is referred to as CSC. Application examples for realistic accelerator components such as the simulation of a full TESLA 1.3 GHz-cavity of the European XFEL are provided. These simulations demonstrate the high accuracy and numerical performance of the proposed method.

Item Type: Article
Erschienen: 2020
Creators: Flisgen, Thomas ; Gjonaj, Erion ; Glock, Hans-Walter ; Tsakanian, Andranik
Title: Generalization of Coupled S-Parameter Calculation to Compute Beam Impedances in Particle Accelerators
Language: English
Abstract:

In this article, a decomposition approach for the computation of beam coupling impedances is proposed. This approach can account for the mutual electromagnetic coupling in long accelerator structures consisting of several consecutive segments. The method is based on the description of the individual segments using a multimodal network matrix formulation in which the charged particle beam is considered as an additional port. Then, the generalized multimodal network matrices of all segments are combined to a multimodal network matrix of the complete structure. The beam coupling impedance as well as the scattering parameters of the full structure are recovered as particular matrix elements in this multimodal network matrix. The new method generalizes Coupled S-Parameter Calculation (CSC) introduced in earlier work such that charged particle beams are considered. Consequently, the introduced scheme is referred to as CSC. Application examples for realistic accelerator components such as the simulation of a full TESLA 1.3 GHz-cavity of the European XFEL are provided. These simulations demonstrate the high accuracy and numerical performance of the proposed method.

Journal or Publication Title: Physical Review Accelerators and Beams
Journal volume: 23
Number: 3
Publisher: APS Physics
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute of Electromagnetic Field Theory (from 01.01.2019 renamed Institute for Accelerator Science and Electromagnetic Fields)
18 Department of Electrical Engineering and Information Technology > Institute for Accelerator Science and Electromagnetic Fields
Date Deposited: 19 Feb 2021 11:33
DOI: 10.1103/PhysRevAccelBeams.23.034601
Additional Information:

TEMF-Pub-DB TEMF002764, Art.No.: 034601

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