Development of a solid state amplifier for the 3rd harmonic cavity for alba synchrotron light source

• Autores: Zahra Hazari
• Directores de la Tesis: Francisco José Pérez Rodríguez (dir. tes.), Youri Koubychine Merkulov (codir. tes.)
• Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2020
• Idioma: español
• Tribunal Calificador de la Tesis: Benito Gimeno Martínez (presid.), Raquel Muñoz (secret.), Daniel Esperante Pereira (voc.)
• Programa de doctorado: Programa de Doctorado en Ingeniería Nuclear y de las Radiaciones Ionizantes por la Universidad Politécnica de Catalunya
• Materias:
  • Física
    • Electromagnetismo
      • Radioondas y microondas
  • Ciencias tecnológicas
    • Tecnología electrónica
      • Dispositivos de microondas
      • Transistores
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• Resumen

  • In Synchrotron Light Source facilities with high energy and low emittance electron beams different techniques for improving the quality of the synchrotron light for the users are applied. With this aim ALBA, the Spanish 3rd generation Synchrotron Light Source, is developing a 3rd Harmonic radiofrequency (RF) system as a system additional to the main RF system of the storage ring. This system will consist of four normal conducting active cavities at 1.5 GHz that will provide the required 1.1 MV accelerating voltage to the electron beam and will be fed by four 20 kW power transmitters. This power will be generated by modular Solid State Power Amplifiers (SSPAs) in a continuous wave mode at 1.5 GHz. On the basis of preliminary studies it has been decided that the architecture of each 20 kW power transmitter is a tree diagram made up of primary 1 kW SSPA modules connected in parallel in a combination array.

    The present PhD thesis is devoted to the design, building and evaluation of a prototype of the 1 kW SSPA module formed four 250 W primary power amplifier modules. Accordingly, all subsystems, namely input and output matching networks of the 250 W primary module, and a four-way power splitter, a four-way power combiner and a novel directivity compensated directional coupler for the non-invasive power monitoring of the 1 kW power amplifier were also designed and their prototypes were tested. A final evaluation of the combined 1 kW SSPA prototype module was successfully carried out and has shown good performance.

    Keywords: Accelerators, Synchrotron Light Source, RF system, power amplifier, solid state power amplifier, power divider, power combiner, directional coupler, phase shifter