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CORNELL LABORATORY FOR ACCELERATOR-BASED SCIENCES AND EDUCATION

CLASSE NEWS | 11 Jan 2010

Very Low Resistance Achieved in a Re-entrant Niobium Cavity

<noautolink>QVsTemp.png</noautolink>
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).

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.