Commemorative event
Stanford's activities
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TUCTA00
 Opening of the Commemorative Talk Session  
 
  • H. Padamsee
    Cornell University, Ithaca, New York, USA
  
  Dr. Padamsee will lead the commemorative event session. At the benign of the session, he will introduce P.B. Wilson’s paper, which is the first SRF paper at Stanford University. Participants in this event celebrate the 60 years anniversary of the paper.  
slides icon Slides TUCTA00 [0.382 MB]  
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TUCTA01
 Evolution of the Superconducting Linac Program at Stanford  
 
  • A. Schwettman
    Stanford University, Stanford, California, USA
  
  This talk will begin with the early history of SRF at Stanford where the high Q-values and high field levels achieved in superconducting cavities promised to make a significant impact on Low Temperature Physics and Accelerator Physics. For Low Temperature Physics the major interest was verification of the Mattis and Bardeen expression for the surface impedance of superconductors, especially the exponential temperature dependence. For Accelerator Physics the major interest was achieving Continuous Wave (100% Duty Factor) operation, thereby improving signal-to-noise, especially in coincidence experiments. The superconducting linac that we envisioned at Stanford anticipated much more. The design incorporated unique features that capitalized on the expected operation of a superconducting linac with a Standing Wave structure, in a Continuous Wave mode, at Super Fluid helium temperature. The result was the generation and preservation of a low Emittance beam that made it possible to achieve energy resolution of one part in ten thousand at high average currents. It should be noted that the low Emittance beam has also been central to another field of physics, the Free Electron Laser.  
slides icon Slides TUCTA01 [0.664 MB]  
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TUCTA02
 Development of Superconducting Nb for Accelerator Structures at Stanford University: 1966 -1979  
 
  • J.P. Turneaure
    Stanford University, Stanford, California, USA
  
  This talk will start with a brief discussion of why superconducting Nb was of interest for particle accelerator structures. The results of the first Nb cavities that achieved high Q₀¿s up to 1011 and peak electric and magnetic fields of 70 MV/m and 1080 Oe will be described. Then the approach to producing L-band and S-band prototype TM010 mode cavities and accelerator structures will be described, followed by summary results and what was learned from the tests on these cavities and structures. Finally, electron-field-emission loading and electron multipacting experiments and their results will be described.  
slides icon Slides TUCTA02 [0.789 MB]  
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TUCTA03
 Design, Construction, and Utilization of the World¿s First Superconducting Linear Accelerator: 1973-2007  
 
  • T.I. Smith
    Stanford University, Stanford, California, USA
  
  This talk will begin with a discussion of the technical and practical issues that led to the Stanford 55-cell niobium accelerator structure. The clever design of this structure, however, had the unintended consequence of complicating the regenerative beam breakup problem. External loading of breakup modes was introduced for the first time which made it possible to achieve our goal of a linac with a 100 µA average current. This discussion will be followed by a detailed description of the ground-breaking injector system designed to produce a very low emittance beam. This injector, together with its novel system for feedback control of the accelerator fields made it possible to achieve our beam energy resolution goal of 0.01%. The low emittance beam provided by the superconducting accelerator was of central importance in the pioneering free electron laser experiments. Difficulties in achieving our hoped for energy gradients spurred interest in beam recirculation. The rest of the talk will concentrate on details, unique characteristics, and performance of the linac and 5 pass recirculation system we built and operated until mid-2007.  
slides icon Slides TUCTA03 [7.211 MB]  
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