## Microwave Measurements of the Surface Impedance of Superconducting Tin and LeadIn this dissertation, the results of two different experiments are reported. In the first experiment, temperature dependent measurements were made of the surface impedance of superconducting tin and lead at 2.85 and 11.2 GHz; these surface impedance measurements were compared with the Mattis and Bardeen theoretical result, including a finite electron-pair coherence length and a finite electron mean free path. In the second experiment, temperature dependent measurements were made of the ac critical magnetic field of superconducting tin at 2.85 GHz; these ac critical magnetic field measurements were compared with dc critical magnetic field measurements. These two experiments stemmed from the program at Stanford University to develop a superconducting linear accelerator. (Author). |

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### Contents

TEMPERATURE DEPENDENT MEASUREMENTS OF THE SUPERCONDUCTING | 28 |

APPENDICES | 62 |

LIST OF REFERENCES | 73 |

### Common terms and phrases

ac critical magnetic amplitude assumed Bardeen result Bardeen Theoretical Results best fit boundary resistance Burroughs Corporation cavity coherence length conductor constant copper end plate critical magnetic field crystal detector crystal oscillator current density dc magnetic field decay dissertation double integral electric field electron mean free equations experimental data experimental errors Experimental Surface Resistance free parameters frequency synthesizer function of temperature heat flux density klystron London penetration depth Mattis and Bardeen MB and PL mean free path microwave non-random deviations normal-state surface resistance numerical calculations obtained Pippard function power dissipation radial reactance at 0°K reduced energy gap reflected power residual surface resistances resistance of tin resonant Showing the Experimental skin depth steady-state method superconducting surface resistance surface impedance surface reactance SWSD temperature dependent measurements temperature rise Theoretical Surface Resistance thermal resistance tin and lead tin surface transient method transition temperature transmission line two-fluid model zero