On the reliable determination of the magnetic field for first flux-line penetration in technical niobium material
Journal Article
·
OSTI ID:913464
We present a way to reliably determine the field for first penetration H$$_P$$ in various kinds of bulk samples of niobium material used in the technical applications like fabrication of superconducting RF-cavities. Special attention is given to the role of flux line pinning in the determination of H$$_P$$. It is observed that the pinning properties and H$$_P$$ can change (or can be altered) significantly with the chemical treatment of bulk niobium. A correlation is proposed between H$$_P$$ of the niobium materials and the anomalous high-field Q-drop observed in the superconducting RF-cavities fabricated using such niobium material.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 913464
- Report Number(s):
- JLAB-ACO-07-714; DOE/ER/40150-4303; TRN: US0800689
- Country of Publication:
- United States
- Language:
- English
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