CLASSE NEWS | 21 May 2014
The Cornell SRF team recently has fabricated, prepared and tested a 1.3 GHz single cell SRF cavity, which reached record high intrinsic quality factors Q0 at high accelerating fields. To reduce wall losses by the RF fields inside the cavity, the niobium surface layer of the cavity was doped with nitrogen, a procedure originally developed by researchers at FNAL.
In a cavity performance test conducted by graduate student Dan Gonnella, the Cornell cavity reached 2K quality factors of 3.5x1010 at a very high accelerating field of 30 MV/m. At 1.8K and 30 MV/m, the quality factor climbed above 6x1010. No other SRF cavity before has reached such high cryogenic efficiency at high accelerating fields in the 30 MV/m range.
The cavity was prepared and tested as part of Cornell's ongoing LCLS_II high Q0 program, which is led by Prof. Liepe. SRF cavities with high intrinsic quality factors at medium to high fields are of critical importance for future SRF driven linear accelerators. These SRF linacs will operate in continuous mode, and become only feasible with highly efficient (i.e. high Q0) SRF cavities.
Dan Gonnella is in his third year of PhD studies in the SRF group. His advisor is Matthias Liepe.
Cornell Nitrogen-doped Single Cell SRF Cavity Reaches Record Performance
The Cornell SRF team recently has fabricated, prepared and tested a 1.3 GHz single cell SRF cavity, which reached record high intrinsic quality factors Q0 at high accelerating fields. To reduce wall losses by the RF fields inside the cavity, the niobium surface layer of the cavity was doped with nitrogen, a procedure originally developed by researchers at FNAL.
In a cavity performance test conducted by graduate student Dan Gonnella, the Cornell cavity reached 2K quality factors of 3.5x1010 at a very high accelerating field of 30 MV/m. At 1.8K and 30 MV/m, the quality factor climbed above 6x1010. No other SRF cavity before has reached such high cryogenic efficiency at high accelerating fields in the 30 MV/m range.
The cavity was prepared and tested as part of Cornell's ongoing LCLS_II high Q0 program, which is led by Prof. Liepe. SRF cavities with high intrinsic quality factors at medium to high fields are of critical importance for future SRF driven linear accelerators. These SRF linacs will operate in continuous mode, and become only feasible with highly efficient (i.e. high Q0) SRF cavities.
Dan Gonnella is in his third year of PhD studies in the SRF group. His advisor is Matthias Liepe.