Active suppression of microphonics detuning in high Q_{L} cavities
Operation of superconducting radio frequency (SRF) cavities with high loaded quality factors is becoming increasingly preferred for applications which involve low beam loading including energy recovery linacs (ERL). Vibration induced microphonics detuning poses a major operational bottleneck in thes...
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American Physical Society
2019-05-01
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Series: | Physical Review Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.22.052002 |
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doaj-9922df7c6bdc47fd8502aa0571fbac742020-11-25T00:14:20ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882019-05-0122505200210.1103/PhysRevAccelBeams.22.052002Active suppression of microphonics detuning in high Q_{L} cavitiesNilanjan BanerjeeGeorg HoffstaetterMatthias LiepePeter QuigleyZeyu ZhouOperation of superconducting radio frequency (SRF) cavities with high loaded quality factors is becoming increasingly preferred for applications which involve low beam loading including energy recovery linacs (ERL). Vibration induced microphonics detuning poses a major operational bottleneck in these low bandwidth systems, adversely affecting field stability. Besides passive measures of mitigating the vibration sources, modern SRF cavities are also attached to fast tuners incorporating piezoelectric actuators. We demonstrate the narrow band active noise control algorithm for realizing active resonance control and propose a modification based on the least mean square approach to adaptively tune the control parameters and study its stability and performance. We discuss our experience of using passive mitigation techniques while commissioning the main linac cryomodule of the Cornell-BNL ERL test accelerator and report a net reduction in peak detuning by more than a factor of 2 in its unstiffened cavities. Finally, we demonstrate stable performance of our resonance control system with consistent reduction of peak microphonics detuning by almost a factor of 2 on multiple cavities.http://doi.org/10.1103/PhysRevAccelBeams.22.052002 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nilanjan Banerjee Georg Hoffstaetter Matthias Liepe Peter Quigley Zeyu Zhou |
spellingShingle |
Nilanjan Banerjee Georg Hoffstaetter Matthias Liepe Peter Quigley Zeyu Zhou Active suppression of microphonics detuning in high Q_{L} cavities Physical Review Accelerators and Beams |
author_facet |
Nilanjan Banerjee Georg Hoffstaetter Matthias Liepe Peter Quigley Zeyu Zhou |
author_sort |
Nilanjan Banerjee |
title |
Active suppression of microphonics detuning in high Q_{L} cavities |
title_short |
Active suppression of microphonics detuning in high Q_{L} cavities |
title_full |
Active suppression of microphonics detuning in high Q_{L} cavities |
title_fullStr |
Active suppression of microphonics detuning in high Q_{L} cavities |
title_full_unstemmed |
Active suppression of microphonics detuning in high Q_{L} cavities |
title_sort |
active suppression of microphonics detuning in high q_{l} cavities |
publisher |
American Physical Society |
series |
Physical Review Accelerators and Beams |
issn |
2469-9888 |
publishDate |
2019-05-01 |
description |
Operation of superconducting radio frequency (SRF) cavities with high loaded quality factors is becoming increasingly preferred for applications which involve low beam loading including energy recovery linacs (ERL). Vibration induced microphonics detuning poses a major operational bottleneck in these low bandwidth systems, adversely affecting field stability. Besides passive measures of mitigating the vibration sources, modern SRF cavities are also attached to fast tuners incorporating piezoelectric actuators. We demonstrate the narrow band active noise control algorithm for realizing active resonance control and propose a modification based on the least mean square approach to adaptively tune the control parameters and study its stability and performance. We discuss our experience of using passive mitigation techniques while commissioning the main linac cryomodule of the Cornell-BNL ERL test accelerator and report a net reduction in peak detuning by more than a factor of 2 in its unstiffened cavities. Finally, we demonstrate stable performance of our resonance control system with consistent reduction of peak microphonics detuning by almost a factor of 2 on multiple cavities. |
url |
http://doi.org/10.1103/PhysRevAccelBeams.22.052002 |
work_keys_str_mv |
AT nilanjanbanerjee activesuppressionofmicrophonicsdetuninginhighqlcavities AT georghoffstaetter activesuppressionofmicrophonicsdetuninginhighqlcavities AT matthiasliepe activesuppressionofmicrophonicsdetuninginhighqlcavities AT peterquigley activesuppressionofmicrophonicsdetuninginhighqlcavities AT zeyuzhou activesuppressionofmicrophonicsdetuninginhighqlcavities |
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1725390945384398848 |