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Tuning of 3-tap Bandpass Filter During Acceleration for Longitudinal Beam Stabilization at FAIR

Reichardt, Benjamin ; Lens, Dieter ; Klingbeil, Harald ; Domont-Yankulova, Dilyana (2021):
Tuning of 3-tap Bandpass Filter During Acceleration for Longitudinal Beam Stabilization at FAIR. (Publisher's Version)
In: Journal of Physics: Conference Series (JPCS), 1067, Darmstadt, IOP Publishing, 9. International Particle Accelerator Conference (IPAC2018), Vancouver, Canada, 29.04.-04.05.2018, ISSN 1742-6588, e-ISSN 1742-6596,
DOI: 10.26083/tuprints-00017647,
[Conference or Workshop Item]

Abstract

During acceleration in the heavy-ion synchrotrons SIS18/SIS100 at GSI/FAIR longitudinal beam oscillations are expected to occur. To reduce longitudinal emittance blowup, dedicated LLRF beam feedback systems are planned. To date, damping of longitudinal beam oscillations has been demonstrated in SIS18 machine experiments with a 3-tap filter controller (e.g. [1]), which is robust in regard to control parameters and also to noise. On acceleration ramps the control parameters have to be adjusted to the varying synchrotron frequency. Previous results from beam experiments at GSI indicate that a proportional tuning rule for one parameter and an inversely proportional tuning rule for a second parameter is feasible, but the obtained damping rate may not be optimal for all synchrotron frequencies during the ramp. In this work, macro-particle simulations are performed to evaluate, whether it is sufficient to adjust the control parameters proportionally (inversely proportionally) to the change in the linear synchrotron frequency, or if it is necessary to take more parameters, such as bunch-length and synchronous phase, into account to achieve stability and a considerable high damping rate for excited longitudinal dipole beam oscillations. This is done for single- and dual-harmonic acceleration ramps.

Item Type: Conference or Workshop Item
Erschienen: 2021
Creators: Reichardt, Benjamin ; Lens, Dieter ; Klingbeil, Harald ; Domont-Yankulova, Dilyana
Origin: Secondary publication service
Status: Publisher's Version
Title: Tuning of 3-tap Bandpass Filter During Acceleration for Longitudinal Beam Stabilization at FAIR
Language: English
Abstract:

During acceleration in the heavy-ion synchrotrons SIS18/SIS100 at GSI/FAIR longitudinal beam oscillations are expected to occur. To reduce longitudinal emittance blowup, dedicated LLRF beam feedback systems are planned. To date, damping of longitudinal beam oscillations has been demonstrated in SIS18 machine experiments with a 3-tap filter controller (e.g. [1]), which is robust in regard to control parameters and also to noise. On acceleration ramps the control parameters have to be adjusted to the varying synchrotron frequency. Previous results from beam experiments at GSI indicate that a proportional tuning rule for one parameter and an inversely proportional tuning rule for a second parameter is feasible, but the obtained damping rate may not be optimal for all synchrotron frequencies during the ramp. In this work, macro-particle simulations are performed to evaluate, whether it is sufficient to adjust the control parameters proportionally (inversely proportionally) to the change in the linear synchrotron frequency, or if it is necessary to take more parameters, such as bunch-length and synchronous phase, into account to achieve stability and a considerable high damping rate for excited longitudinal dipole beam oscillations. This is done for single- and dual-harmonic acceleration ramps.

Series Name: Journal of Physics: Conference Series (JPCS)
Volume: 1067
Place of Publication: Darmstadt
Publisher: IOP Publishing
Collation: 6 Seiten
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, Canada
Event Dates: 29.04.-04.05.2018
Date Deposited: 02 Jul 2021 12:22
DOI: 10.26083/tuprints-00017647
Official URL: https://tuprints.ulb.tu-darmstadt.de/17647
URN: urn:nbn:de:tuda-tuprints-176478
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