Contribution to a conference proceedings/Contribution to a book

PUBDB-2026-01491

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png From femtosecond to attosecond RF field control

Ludwig, F. (First author)DESY* ; Boghrati, B.DESY* ; Branlard, J.DESY* ; Fenner, M.DESY* ; Hoffmann, M.DESY* ; Mavric, U.DESY* ; Pryschelski, H.DESY* ; Springer, L.DESY* ; Schlarb, H. (Last author)DESY*

2026
JACoW
ISBN: 978-3-95450-252-3

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Please use a persistent id in citations: doi:10.18429/JACoW-IPAC2026-FRI6M01

Abstract: In the past two decades, radio-frequency (RF) controls have improved by two orders of magnitude achieving meanwhile sub-10 fs phase stabilities and 0.01 % amplitude precision. Analog-to-digital-converters (ADCs) are the main limitation for further increase in detector resolution. Alternative architectures are therefore needed to over-come this limitation. The presented work covers a novel application of the suppressed-carrier detector, which extends conventional heterodyne receivers and improves the residual time jitter of the regulated RF-field in the cavity far below 1 fs. A practical implementation of the proposed principle is presented. The setup was used to drive a superconducting RF cavity at 1.3 GHz frequency at a Cryo-Module Test Bench (CMTB) at a gradient of 8 MV/m. The measured out-of-loop residual time jitter of the RF field was 189 as (10 Hz to 1 MHz). The limiting factors of the setup have been identified by feeding the measurements to a system model. In conclusion, a general discussion about future steps is presented.

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Contributing Institute(s):

1. Strahlkontrollen (MSK)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)

Experiment(s):

1. Superconductivity Radio Frequency Research and Development

Appears in the scientific report 2026

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