Contribution to a conference proceedings

PUBDB-2026-01855

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Detuning Estimation for a Doubly-Fed Normal-Conducting Gun

Herrmann, M. (Corresponding author)DESY* ; Brinker, F.DESY* ; Hoffmann, M.DESY* ; Katalev, V.DESY* ; Pfeiffer, S.DESY* ; Schlarb, H.DESY* ; Schmidt, C.DESY*

2026

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Please use a persistent id in citations: doi:10.18429/JACoW-IPAC2026-WEP6148

Abstract: At the European Free-Electron Laser (EuXFEL) super-conducting linac, a revised normal-conducting gun designwith symmetrical feed was successfully installed and tested.Thermal expansion of the solid copper body dominantlyaffects the detuning transients of this cavity. To improve accuracy, and add time resolution over the duration of a pulse,we implemented and tested an observer that estimates theresonance frequency over time using a parameter-identifiedwhite-box model of the RF network. Results were validatedagainst forward and reflected power couplers, cavity voltage,and an algebraic stationary approximation.

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Contributing Institute(s):

1. Strahlkontrollen (MSK)
2. Beschleunigerphysik (MPY)
3. Hochfrequenztechnik Radio Frequency Tech (MHF)

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. Facility (machine) XFEL

Appears in the scientific report 2026

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