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  4. A low-noise front-end for an X-band particle deflector at DESY
 
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A low-noise front-end for an X-band particle deflector at DESY

Citation Link: https://doi.org/10.15480/882.4402
Publikationstyp
Doctoral Thesis
Date Issued
2022
Sprache
English
Author(s)
Reukauff, Matthias  orcid-logo
Advisor
Jacob, Arne  
Referee
Werner, Herbert  
Ludwig, Frank  
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2022-03-03
Institut
Hochfrequenztechnik E-3  
TORE-DOI
10.15480/882.4402
TORE-URI
http://hdl.handle.net/11420/12934
Citation
Technische Universität Hamburg (2022)
Peer Reviewed
false
In this thesis, a low-level RF (LLRF) system for the novel polarizable transverse deflecting structure PolariX TDS is developed, installed, and commissioned at the FLASHForward beamline at DESY. The PolariX TDS operates in the X-band at 12 GHz and requires an LLRF system capable of measuring and processing signals in this frequency band. Using an approach to reuse the existing S-band LLRF system that can process signals at 3 GHz, new hardware is being developed that converts RF signals between 12 GHz and 3 GHz.

The underlying components of this conversion hardware are RF mixers, filters, amplifiers, and frequency multipliers. Various candidates for all these components are characterized and compared in terms of their electrical characteristics. Since the final system performance depends heavily on the phase noise, the main focus of the characterization will be on this.

With the components selected, printed circuit boards are designed, simulated, produced and packaged in hermetically sealed housings before being mounted in 19" modules. After completion, the modules are also characterized in the laboratory.

As a final step, the prototype of the PolariX TDS will be installed in the FLASHForward beamline together with the developed LLRF system. After successful commissioning, first measurements will be performed in the running accelerator. To analyze the short-term behaviour, possible procedures to eliminate the long-term effects will be discussed.

The actuator chain, consisting of LLRF system, klystron and its preamplifier, is measured and characterized. The results show some discrepancy between expected and measured values and an analysis of possible sources of the problem is performed.

Beam-based measurements are used to analyze the relation between the RF and the beam in terms of phase and amplitude noise. These measurements show good performance of the overall system in terms of short term phase stability in general. However, small deviations from the expected behavior are seen, analyzed, and procedures to correct them are proposed. Analyses of the long-term behavior show a large difference between the RF and beam-based measurements, which causes are still subject of research.

Although not as important as the phase noise, the amplitude noise is also investigated and similar to the long term behavior, the measured RF shows better performance than the beam based measurements.
Subjects
Particle accelerators
Radio frequency
X-Band
Transverse Deflecting Structure
PolariX
DDC Class
530: Physik
Lizenz
https://creativecommons.org/licenses/by/4.0/
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