RRR Characteristics for SRF Cavities
| Autor: | Myungook Hyun, Mijoung Joung, Yoochul Jung |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Accelerator Physics (physics.acc-ph) Materials science business.industry Niobium General Physics and Astronomy chemistry.chemical_element FOS: Physical sciences Welding law.invention Resonator chemistry Impurity law Electron beam welding Optoelectronics Physics - Accelerator Physics Vacuum level business Residual-resistance ratio |
| DOI: | 10.48550/arxiv.1507.07658 |
| Popis: | The first heavy ion accelerator is being constructed by the rare isotope science project (RISP) launched by the Institute of Basic Science (IBS) in South Korea. Four different types of superconducting cavities were designed, and prototypes were fabricated such as a quarter wave resonator (QWR), a half wave resonator (HWR) and a single spoke resonator (SSR). One of the critical factors determining performances of the superconducting cavities is a residual resistance ratio (RRR). The RRR values essentially represent how much niobium is pure and how fast niobium can transmit heat as well. In general, the RRR degrades during electron beam welding due to the impurity incorporation. Thus it is important to maintain RRR above a certain value at which a niobium cavity shows target performance. In this study, RRR degradation related with electron beam welding conditions, for example, welding power, welding speed, and vacuum level will be discussed. |
| Databáze: | OpenAIRE |
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