Geometrical corrections for accurate fitting of the field dependent surface resistance for superconducting accelerating cavities
| Autor: | D. Longuevergne |
|---|---|
| Přispěvatelé: | Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Physics Nuclear and High Energy Physics 010308 nuclear & particles physics Drop (liquid) [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] Field dependence Local property 01 natural sciences Rf field Computational physics Magnetic field Superconducting cavity 0103 physical sciences 010306 general physics Instrumentation Sheet resistance |
| Zdroj: | Nucl.Instrum.Meth.A Nucl.Instrum.Meth.A, 2018, 910, pp.41-48. ⟨10.1016/j.nima.2018.08.005⟩ Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2018, 910, pp.41-48. ⟨10.1016/j.nima.2018.08.005⟩ |
| ISSN: | 0168-9002 |
| DOI: | 10.1016/j.nima.2018.08.005⟩ |
| Popis: | The different processes at the origin of the dependence of the surface resistance with the RF magnetic field are still not fully understood. Several models have emerged since many years to explain the drop of the quality factor Q 0 (commonly called Q-drop) of a superconducting cavity versus the accelerating gradient. Experimental data are commonly fitted by applying a coarse approximation to convert the Q 0 (a global property) into a surface resistance (local property). Extracting accurately the surface resistance from experimental data requires to take into account the RF field distribution over the accelerating structure contrary to what is commonly done in the community. Assuming a field dependent surface resistance does not allow anymore to use the well-known formula Q 0 = G ∕ R s . This paper gives a procedure to perform an accurate conversion of the quality factor measured during a cavity test into a surface resistance to avoid any error in the evaluation of fitting parameters due to the geometry. |
| Databáze: | OpenAIRE |
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