Journal Article

PUBDB-2025-00488

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png An Upgrade of Radio Frequency Reference Generation and Distribution Modules for FLASH2020+

Urbański, M. (Corresponding author)Extern* ; Gąsowski, B.Extern* ; Czuba, K.Extern* ; Kola, B. ; Jatczak, P. ; Owczarek, T.Extern* ; Šerlat, A. ; Branlard, J.DESY* ; Kühn, D.DESY* ; Ludwig, F.DESY* ; Pryschelski, H.DESY* ; Schulz, K.DESY*

2025
MDPI Basel

This record in other databases:    

Please use a persistent id in citations: doi:10.3390/electronics14010173  doi:10.3204/PUBDB-2025-00488

Abstract: Free-Electron Laser in Hamburg (FLASH), first launched in 2005, was the first free-electron laser that provided ultrashort radiation pulses in extreme ultraviolet and soft X-ray spectral range. In 2017, it was decided to improve the existing FLASH facility within the FLASH2020+ project, which led to upgrading the existing linac with variable gap tunable undulators in the FLASH1 line and refurbishing two cryomodules to achieve a beam energy increase to 1.35 GeV. It was also a perfect opportunity to completely redesign and rebuild the radio frequency (RF) phase reference generation and distribution system. This paper presents the design and parameters of new, custom-made phase reference signal generation and distribution modules, successfully installed in FLASH. These are the main oscillator, the RF distribution module, and the frequency conversion modules. The new instrumentation presents a significant improvement in terms of RF reference signal parameters, state-of-the-art phase noise performance (an improvement in the total jitter of the 1.3 GHz RF signal from 55.9 fs to 10.7 fs in the integration range from 10 Hz to 1 MHz), module compactness (size reduction from three fully occupied rack cabinets to four 19″ modules only), and serviceability. The presented Main Oscillator system design is foreseen for easy modifications, making it suitable for applications in other accelerator facilities or hardware platforms.

Note: , agreement 5083/DESY/2020/0

---

Contributing Institute(s):

1. Strahlkontrollen (MSK)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. FLASH 2020+ Project

Appears in the scientific report 2025

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---