My research activities are primarily focused on accelerator physics. I am working with our superconducting RF group currently led by Prof. Matthias Liepe in developing high gradient superconducting RF cavities suitable for use in an electron positron linear collider.  I have developed a technique based on second sound in superfluid helium to locate the site when the quench occurs in these cavities when they are driven to very high gradients.  An array of sixteen tranducers can locate the quench site to a few millimeters.  This is more accurate and very much simpler than the thermometer arrays used in the past involving many hundreds of thermometers limited to only two cells of a multi-cell cavity.  I am continuing a modest program on developing low frequency superconducting RF cavities (200 MHz) suitable for muon beam acceleration.

B.Sc., 1961, Massachusetts Institute of Technology. Ph.D., 1967, California Institute of Technology. Research Associate, CERN, 1967-68. Assistant Professor, Physics, Cornell University, 1968-74. Associate Professor, Physics, Cornell University, 1974-80. Professor, Physics, Cornell University, 1980-2016. Visiting appointments include: Stanford Linear Accelerator Center; Osservatoria Astrofisico di Arcetri, Florence Italy; SSC Central Design Group, LBL. Alfred P. Sloan Fellow, 1971-74. Fellow, American Physical Society. Fellow, American Association for the Advancement of Science.