Jul 20, 2019   7:39 a.m. Iľja
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doc. Ing. Oldřich Ondráček, PhD.
Identification number: 2082
University e-mail: oldrich.ondracek [at] stuba.sk
Docent CSc.,PhD. - Institute of Electronics and Phototonics (FEEIT)

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Basic information

Basic information about a final thesis

Type of thesis: Dissertation thesis
Thesis title:Design and Optimization of the Beam Orbit and Oscillation Measurement System for the Large Hadron Collider
Written by (author): Ing. Jakub Olexa, PhD.
Department: Institute of Electronics and Phototonics (FEEIT)
Thesis supervisor: doc. Ing. Oldřich Ondráček, PhD.
Opponent 1:prof. Ing. Milan Štork, CSc.
Opponent 2:Ing. Ivan Gašparík, PhD.
Final thesis progress:Final thesis was successfully defended.

Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:English

Slovak        English

Title of the thesis:Design and Optimization of the Beam Orbit and Oscillation Measurement System for the Large Hadron Collider
Summary:The main subject of this doctoral thesis is development and optimisation of an electronics system dedicated for precision measurements of the transverse positions of the particle beams in the Large Hadron Collider (LHC). The system called DOROS (Diode Orbit and Oscillation) processes electrode signals from beam position monitors (BPM) to provide the beam orbit and oscillation measurements. The thesis describes the design and implementation of the analogue and digital signal processing as well as the Ethernet communication, control automation, synchronization and calibration techniques. Part of the DOROS system, which is based on novel diode detector technique, was designed and optimized to perform precision beam measurements of the beam orbits. Experimental part of the thesis presents measurement results obtained in the laboratory as well as with the LHC beams. The system achieves sub-micrometre precision and micrometre-order accuracy of the orbit measurements. The second part of the DOROS system was designed and optimised for measuring small beam oscillations. Dedicated timing circuits described in the thesis allow to synchronize the system to the common reference clock obtained from the beam signals. The system achieves sub-micrometre sensitivity to excited beam oscillations used for performance optimisations in the LHC. The DOROS system was primarily designed for the LHC collimators with embedded BPM electrodes in the movable jaws. This system is critical for safety and reliability of the accelerator. The position measurements allow precision alignments of the collimator jaws with the beams. The readings from the system are also used by the LHC interlock system, which terminates operation with beams if the beam positions exceed safe limits. The DOROS system has been also used to measure beam positions in the most important BPMs around the main LHC experiments. The position measurements have been used to monitor a few LHC beam parameters, important for potential improvements of the machine performance.
Key words:diode detectors, particle beam position, particle beam oscillations

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