Hänichen, Lukas (2016)
Numerical calculation of beam Coupling Impedances in Synchrotron Accelerators.
Technische Universität Darmstadt
Ph.D. Thesis, Primary publication
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Numerical calculation of beam Coupling Impedances in Synchrotron Accelerators | ||||
Language: | English | ||||
Referees: | Weiland, Prof. Dr.- Thomas ; Klingbeil, Prof. Dr.- Harald | ||||
Date: | 2016 | ||||
Place of Publication: | Darmstadt | ||||
Date of oral examination: | 2 December 2015 | ||||
Abstract: | Beams of charged particles are of interest in various fields of research including particle and nuclear physics, material and medical science and many more. In synchrotron accelerators the accelerating section is passed multiple times. A closed loop trajectory is enforced, by increasing the frequency of the accelerating electric field and the magnitude of the dipolar magnetic guide field synchronously. A synchrotron therefore consists of a circular assembly of various beamline elements which serve the purposes of accelerating and guiding of the particle beam. For the flawless operation of such a machine it has to be assured that the particles perform a controlled motion along predefined trajectories. Amongst others, the fulfillment of the corresponding stability criteria is in close conjuction with the so-called beam coupling impedances which are an important figure of merit for collective effects in synchrotron accelerators. This work focuses on analytical and numerical methods for the calculation of beam coupling impedances. One of the primary objectives is to gain a better understanding of charged particle beam electrodynamics, the mathematical description in both time and frequency domain and establish the links between actual physics and numerical modeling. Analytical methods are usually restricted to symmetrical geometry and may solely serve for the approximate determination of the field distribution in real geometries or to validate certain numerical methods. Finally, more accurate prognosis is only possible with 3D numerical simulation models. Numerical simulation techniques have been established in the second half of the last century accompanying the evolution of many particle accelerators. Classical time domain codes were the prevailing simulation tools where the actual process of the particle motion sequence is reproduced. For the present case of a heavy ion synchrotron accelerator, particle velocities significantly lower than the speed of light occur and the commonly applied ultra-relativistic limit case may no longer be practicable. Ferrite-loaded kicker magnets are commonly used to achieve abrupt changes of the beam direction of motion and contribute to the coupling impedance due to hysteresis properties of the ferrite material. These coupling impedance contributions must be determined to assess the feedback action on the traversing particles particles of the beam. After introducing important mathematical relations and presentation of two calculation methods, a few reference examples are discussed, which can be treated bymeans of the classical electromagnetic field theory. After showing that the simulation results are in accordance with the corresponding analytical results, the focus is put on simulation models that represent actual components of the FAIR SIS100 synchrotron accelerator. |
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URN: | urn:nbn:de:tuda-tuprints-53673 | ||||
Classification DDC: | 500 Science and mathematics > 500 Science 500 Science and mathematics > 530 Physics 600 Technology, medicine, applied sciences > 600 Technology 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering |
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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 of Electromagnetic Field Theory (from 01.01.2019 renamed Institute for Accelerator Science and Electromagnetic Fields) > Accelerator Physics (until 31.12.2018) 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) > Accelerator Technology (until 31.12.2018) |
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Date Deposited: | 29 Jul 2016 12:55 | ||||
Last Modified: | 09 Jul 2020 01:15 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/5367 | ||||
PPN: | 385246323 | ||||
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