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| MOPB010 |
Field-Dependent Surface Resistance for Superconducting Niobium Accelerating Cavities: The Case of N-Doping |
niobium, cavity, electron, superconductivity |
95 |
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- W. Weingarten
Private Address, SERGY, France
- R.G. Eichhorn
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
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The dependence of the Q-value on the RF field (Q-slope) for superconducting RF cavities is actively studied in various accelerator laboratories. Although remedies against this dependence have been found, the physical cause still remains obscure. A rather straightforward two-fluid model description of the Q-slope in the low and high field domains is extended to the case of the recently experimentally identified increase of the Q-value with the RF field obtained by so-called "N-doping”.
This paper was initiated when one of the authors (W.W., retiree from CERN) visited Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, NY.
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| TUPB042 |
Low Energy Muon Spin Rotation and Point Contact Tunneling Applied to Niobium Films for SRF Cavities |
niobium, cavity, experiment, scattering |
656 |
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- T. Junginger
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
- S. Calatroni, G. Terenziani
CERN, Geneva, Switzerland
- T. Prokscha, Z. Salman, A. Suter
PSI, Villigen PSI, Switzerland
- Th. Proslier
ANL, Argonne, Illinois, USA
- G. Terenziani
Sheffield University, Sheffield, United Kingdom
- J. Zasadzinski
IIT, Chicago, Illinois, USA
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Muon spin rotation (muSR) and point contact tunneling (PCT) are used since several years for bulk niobium studies. Here we present studies on niobium thin film samples of different deposition techniques (diode, magnetron and HIPIMS) and compare the results with RF measurements and bulk niobium results. It is consistently found from muSR and RF measurements that HIPIMS can be used to produce thin films of high RRR. Hints for magnetism are especially found on the HIPIMS samples. These could possibly contribute to the field dependent losses of superconducting cavities, which are strongly pronounced on niobium on copper cavities.
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Poster TUPB042 [0.932 MB]
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