Contribution to a conference proceedings

PUBDB-2025-02270

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Optimization of Piezo Operation for Superconducting TESLA Cavities at EuXFEL

Grecki, M. (Corresponding author)DESY* ; Branlard, J.DESY* ; Diomede, M.DESY* ; Schmidt, C.DESY* ; Herrmann, M.DESY*

2025

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Please use a persistent id in citations: doi:10.18429/JACoW-IPAC25-THPS040

Abstract: Superconducting cavities with high Q-factor require precise tuning to match the RF frequency, ensuring stable electromagnetic fields and minimizing RF power consumption. At the XFEL accelerator, TESLA cavities are tuned using slow tuners (step motors) for coarse adjustments and fast tuners (piezoelectric actuators) for fine-tuning and compensating disturbances such as Lorentz Force Detuning (LFD) and microphonics*. Critical to this system, Piezo actuators require high-voltage (up to 100V) and high-current (up to 1A) driving signals for effective LFD compensation. However, they are vulnerable to overvoltage, overcurrent, and overheating**, and their protection is crucial since replacing damaged piezo in fully assembled modules is unfeasible. Additionally, piezo induced vibrations can affect the machine's stability. Optimizing piezo excitation—by reducing voltage, current, and current slope while ensuring effective LFD compensation—improves both reliability and machine stability. This paper explores the optimization of piezo excitation at XFEL, detailing methods and results applicable to other facilities with superconducting cavities.

Note: At the time of this request, the publication was not yet available on doi.org (10.18429/JACoW-IPAC25-THPS040).

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Contributing Institute(s):

1. Strahlkontrollen (MSK)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. iSAS - Innovate for Sustainable Accelerating Systems (101131435) (101131435)

Experiment(s):

1. Experiments at XFEL

Appears in the scientific report 2025

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