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Cavity Impedance Reduction Strategies During Multi Cavity Operation in the SIS100 High Intensity Hadron Synchrotron

Mihailescu-Stoica, Dinu and Domont-Yankulova, Dilyana and Lens, Dieter and Klingbeil, Harald (2021):
Cavity Impedance Reduction Strategies During Multi Cavity Operation in the SIS100 High Intensity Hadron Synchrotron. (Publisher's Version)
In: Proceedings of the 9th International Particle Accelerator Conference, pp. 4863-4865,
Geneva, JACoW Publishing, 9. International Particle Accelerator Conference (IPAC2018), Vancouver, Kanada, 29.04.-04.05.2018, ISBN 978-3-95450-184-7,
DOI: 10.26083/tuprints-00017654,
[Conference or Workshop Item]

Abstract

The planned SIS100 heavy ion synchrotron at the GSI Helmholtzzentrum für Schwerionenforschung will possess twenty ferrite accelerating cavities in its final stage of extension. As at injection and at flat top during slow extraction of the planned acceleration cycles the RF voltage will be relatively low, not all cavities will be active in this part of operation. It is important to analyse the impact of the inactive cavities on the overall RF voltage and subsequently their implication on the longitudinal particle dynamics. Classical approaches for reducing the beam impedance consist of active detuning of the cavities to pre-described parking frequencies. The fact that two out of ten buckets have to stay empty in all SIS100 scenarios is of particular interest as additional frequency components appear in the excitatory beam current, which have to be considered when the cavity is detuned. Therefore multi-cavity particle tracking simulations, consisting of twenty cavities and their attached LLRF control systems, are carried out in order to analyse different possibilities to minimize the impact on the beam dynamics and emittance growth.

Item Type: Conference or Workshop Item
Erschienen: 2021
Creators: Mihailescu-Stoica, Dinu and Domont-Yankulova, Dilyana and Lens, Dieter and Klingbeil, Harald
Origin: Secondary publication service
Status: Publisher's Version
Title: Cavity Impedance Reduction Strategies During Multi Cavity Operation in the SIS100 High Intensity Hadron Synchrotron
Language: English
Abstract:

The planned SIS100 heavy ion synchrotron at the GSI Helmholtzzentrum für Schwerionenforschung will possess twenty ferrite accelerating cavities in its final stage of extension. As at injection and at flat top during slow extraction of the planned acceleration cycles the RF voltage will be relatively low, not all cavities will be active in this part of operation. It is important to analyse the impact of the inactive cavities on the overall RF voltage and subsequently their implication on the longitudinal particle dynamics. Classical approaches for reducing the beam impedance consist of active detuning of the cavities to pre-described parking frequencies. The fact that two out of ten buckets have to stay empty in all SIS100 scenarios is of particular interest as additional frequency components appear in the excitatory beam current, which have to be considered when the cavity is detuned. Therefore multi-cavity particle tracking simulations, consisting of twenty cavities and their attached LLRF control systems, are carried out in order to analyse different possibilities to minimize the impact on the beam dynamics and emittance growth.

Title of Book: Proceedings of the 9th International Particle Accelerator Conference
Place of Publication: Geneva
Publisher: JACoW Publishing
ISBN: 978-3-95450-184-7
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institut für Automatisierungstechnik und Mechatronik
18 Department of Electrical Engineering and Information Technology > Institut für Automatisierungstechnik und Mechatronik > Control Methods and Robotics
18 Department of Electrical Engineering and Information Technology > Institute for Accelerator Science and Electromagnetic Fields > Accelerator Technology
18 Department of Electrical Engineering and Information Technology > Institute for Accelerator Science and Electromagnetic Fields
Event Title: 9. International Particle Accelerator Conference (IPAC2018)
Event Location: Vancouver, Kanada
Event Dates: 29.04.-04.05.2018
Date Deposited: 08 Apr 2021 06:56
DOI: 10.26083/tuprints-00017654
Official URL: https://tuprints.ulb.tu-darmstadt.de/17654
URN: urn:nbn:de:tuda-tuprints-176547
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