Journal Article

PUBDB-2025-01733

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Estimation of superconducting cavity bandwidth and detuning using a Luenberger observer

Richter, B. (Corresponding author)DESY* ; Bellandi, A.DESY* ; Branlard, J.DESY* ; Speidel, L.Extern* ; Eichler, A.XFEL.EU*DESY*

2026
American Physical Society College Park, MD

This record in other databases:    

Please use a persistent id in citations: doi:10.1103/48zw-grdp  doi:10.3204/PUBDB-2025-01733

Report No.: arXiv:2506.21207

Abstract: Enabled by progress in superconducting technology, several continuous wave linear accelerators are foreseen in the next decade. For these machines, it is of crucial importance to track the main cavity parameters, such as the resonator bandwidth and detuning. The bandwidth yields information on the superconducting state of the cavity. The detuning should be minimized to limit the required power for operation of the cavity. The estimation of these parameters is commonly implemented in the digital electronics of the low-level rf control system to minimize the computation delay. In this proceedings paper, we present a way to compute the bandwidth and detuning using a Luenberger observer. In contrast to previous methods, the state observer yields estimations at the native control system sample rate without explicitly filtering the input signals. Additionally, the error convergence properties of the estimations can be controlled intuitively by adjusting gain parameters. Implementation considerations and test results for the derived observer are presented in the manuscript.

Note: Minor corrections and formatting for APS submission. 11 pages, 4 figures, to be published in APS Physical Review - Accelerator and Beams

---

Contributing Institute(s):

1. Strahlkontrollen (MSK)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. 6G13 - Accelerator of European XFEL (POF4-6G13) (POF4-6G13)
3. iSAS - Innovate for Sustainable Accelerating Systems (101131435) (101131435)

Experiment(s):

1. Facility (machine) XFEL
2. Experiments at XFEL

Appears in the scientific report 2026

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Richter, B. (Corresponding author)DESY* ; Bellandi, A. ; Branlard, J.DESY* ; Speidel, L. ; Eichler, A.XFEL.EU*DESY*
Estimation of superconducting cavity bandwidth and detuning using a Luenberger observer
(2026) [10.3204/PUBDB-2026-03209]2026     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---