Now showing items 1-7 of 7

    • Accurate determination of dielectric properties in small, high-permittivity dielectric cylinders 

      Tagdulang, Nikki; Krkotic, Patrick; Díez, A.; Pont Montaner, Montserrat; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Conference lecture
      Open Access
      We describe a method for performing cryogenic permittivity and loss tangent measurements of small (few mm), high-permittivity dielectric cylinders used in surface impedance measurement of superconductors. We combine the ...
    • Algorithm for resonator parameter extraction from symmetrical and asymmetrical transmission responses 

      Krkotic, Patrick; Gallardo Moix, Queralt; Tagdulang, Nikki; Pont Montaner, Montserrat; O'Callaghan Castellà, Juan Manuel (IEEE Microwave Theory and Techniques Society, 2021-08)
      Article
      Open Access
      We describe an algorithm capable of extracting the unloaded quality factor and the resonant frequency of microwave resonators from vector S-parameters. Both symmetrical (Lorentzian) and asymmetrical (Fano) transmission ...
    • Determination of pumping and dynamic vacuum properties of conductive quaternary alloy of TiZrVAg non-evaporable getter 

      Valizadeh, Reza; Hannah, Adrian N.; Malyshev, Oleg; Hsiung, G.Y.; O'Callaghan Castellà, Juan Manuel; Pont, Montse; Tagdulang, Nikki (Joint Accelerator Conferences Website (JACoW), 2022)
      Conference report
      Open Access
      Non Evaporable Getter (NEG) coating has been employed extensively in the particle accelerator especial-ly where the vacuum conductance of the vessel is se-verely restricted and ultra-high vacuum condition is required. NEG ...
    • Evaluation of the nonlinear surface resistance of REBCO coated conductors for their use in the FCC-hh beam screen 

      Krkotic, Patrick; Romanov, Artur; Tagdulang, Nikki; Telles, Guilherme; Puig Molina, Teresa; Gutiérrez Royo, Joffre; Granados García, Xavier; Calatroni, Sergio; Pérez, Francis; Pont Montaner, Montserrat; O'Callaghan Castellà, Juan Manuel (2022-01-07)
      Article
      Open Access
      To assess the feasibility of using high-temperature superconductors for the beam screens of future circular colliders, we have undertaken a study of the power dependence of the microwave surface resistance in state-of-the-art ...
    • Performance of high-temperature superconducting REBCO coated conductors under synchrotron irradiation for future circular colliders 

      Krkotic, Patrick; Traver Ramos, Oriol; Tagdulang, Nikki; Calatroni, Sergio; O'Callaghan Castellà, Juan Manuel; Pont Montaner, Montserrat (Institute of Physics (IOP), 2023-10-01)
      Article
      Open Access
      The influence of medium-to-high energy synchrotron radiation (SR) (˜10–100 keV) produced by the ALBA Synchrotron Light Source on state-of-the-art REBCO coated conductors (CCs) has been studied to assess the feasibility of ...
    • Potential impedance reduction by REBCO coated conductors as beam screen coating for the future circular hadron collider 

      Krkotic, Patrick; Tagdulang, Nikki; Calatroni, Sergio; O'Callaghan Castellà, Juan Manuel; Pont Montaner, Montserrat (2022-12)
      Article
      Open Access
      The Future Circular Collider study creates a conceptual design for a post-LHC particle accelerator using 16T superconducting dipoles to achieve collision energies of up to 100TeV in a 90km circumference ring. A copper-coated ...
    • RF characterisation of new coatings for future circular collider beam screens 

      Krkotic, Patrick; Pérez, Francis; Pont Montaner, Montserrat; Tagdulang, Nikki; Calatroni, Sergio; O'Callaghan Castellà, Juan Manuel; Granados García, Xavier; Gutiérrez Royo, Joffre; Puig Molina, Teresa; Romanov, Artur; Telles, Guilherme; Hannah, Adrian N.; Malyshev, Oleg; Valizadeh, Reza; Whitehead, David J. (Joint Accelerator Conferences Website (JACoW), 2021)
      Conference lecture
      Open Access
      For the future high energy colliders being under the design at this moment, the choice of a low surface impedance beam screen coating material has become of fundamental importance to ensure sufficiently low beam impedance ...