Superconducting non-contact linear slider for precision positioning in cryogenic environments

• Autores: Ignacio Valiente Blanco
• Directores de la Tesis: José Luis Pérez Díaz (dir. tes.)
• Lectura: En la Universidad Carlos III de Madrid ( España ) en 2013
• Idioma: inglés
• Tribunal Calificador de la Tesis: María del Carmen Muñoz de Pablo (presid.), Carlos Molpeceres Alvarez (secret.), Johannes Franciscus Zevenbergen (voc.)
• Materias:
  • Física
    • Electromagnetismo
      • Superconductividad
• Enlaces
  • Tesis en acceso abierto en: e-Archivo
• Resumen

  • In this thesis, a novel device for precision positioning in a long stroke suitable for cryogenics environments has been proposed, designed, built and tested. The device is based on superconducting magnetic levitation. A set of high temperature superconductors allows a long permanent magnet to levitate stably over them. Furthermore, due to the high translational symmetry of the magnetic field applied on the superconductors for any position of the slider in its path, the superconductors not only provide stable levitation to the slider, but al so guide it. Therefore, a sliding kinematic pair is established between the permanent magnet and the superconductors. Finally, using a pair of coils, the position of the slider can be controlled with an open-Ioop control strategy of the current in the coils with nanometre resolution and reduced power consumption. Besides, a set of design rules has been proposed and experimentally verified at 77 K. Parameters of the performance of the mechanism such as the stroke, sensitivity, stiffness, natural frequency, run outs or the power consumption can be modified and optimized by an appropriate designo After this, two prototypes of a long stroke nanopositioner based on these design rules have been built and tested in a relevant environment (T~15 K, in a high vacuum < 10?? Pa). Nanometre resolution in the positioning of a mass of about 170 g has been demonstrated in a stroke up to 18 mm. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------