CLASSE NEWS | 11 Jan 2010
A cavity with a very low residual resistance was recently measured at Cornell by graduate student Nick Valles. The re-entrant Niobium cavity received a low temperature vertical electropolish and had a surface resistance of only (0.92 ± 0.23) nΩ, a value among some of the lowest recorded. The cavity's intrinsic quality factor was 1.5*1011 at 1.7 K and an accelerating gradient of 6.2 MV/m. This cutting-edge result illustrates the ongoing effort at CLASSE to be at the forefront of superconducting RF physics, where the development of very high Q cavities is crucial for the efficient operation of next generation CW SRF light sources or particle accelerators such as Cornell's Energy Recovery Linac or Fermilab's Project X.
Very Low Resistance Achieved in a Re-entrant Niobium Cavity
Quality factor of the cavity as a function of temperature. The cavity had a quality factor of 1.5*1011 at 1.7 K. Data was taken at an accelerating gradient of 6 MV/m (click for enlarged view).