Superconducting Rf - New Directions*

In the last two years, there has been substantial progress in superconducting accelerator technology both in long term operation at many facilities as well as in high gradients at many laboratories. These rapid advances have made RF superconductivity an enabling technology for a variety of new applications. In high energy physics, low frequency (200 – 400 MHz) cavities are envisioned to accelerate muons for intense neutrino beams and muon colliders (200 – 1300 MHz). For storage ring based light sources, superconducting cavity systems (500 MHz) will upgrade the Taiwan Light Source and provide high voltage and high power for new storage rings under construction for the Canadian Light Source (CLS), DIAMOND in England, and SOLEIL (350 MHz) in France. Similar systems are envisioned for BEPC in China and for the new Shangai Light Source. Superconducting linacs are now driving low emittance beams in a number of free electron lasers (FEL), stimulating new FEL projects and new energy recovery linacs (ERL) to generate x-ray beams. High intensity proton beams at LHC will be supported by 400 MHz superconducting systems. A high intensity (2 MW) proton linac from 200 MeV to 1000 MeV based on 800 MHz superconducting cavities will drive the U.S. Neutron Spallation Source (SNS). A large fraction of cavities will be for low velocity (beta = v/c=0.6) protons. Higher intensity (5 – 10 MW) proton linacs are under planning in Europe for neutron spallation, accelerator transmutation of waste, energy amplifier, as well as to generate muons for neutrino beams. Radioactive beams for nuclearastrophysics will be accelerated by superconducting cavities between 58 and 700 MHz.