Review of High Field Q Slope, Cavity Measurements.

Ciovati, G.

Technical Information Center Oak Ridge Tennessee

关键词: Superconducting radio-frequency cavities;    Cavity measurements;    Q slope;    Q drop;    Superconducting radio-frequency (SRF);   

RP-ID  :  DE2008922270

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

One of the most interesting phenomenon occurring in superconducting radio-frequency (SRF) cavities made of bulk niobium is represented by a sharp decrease of the quality factor above peak surface magnetic field of about 90 mT and is referred to as 'high field Q-slope' or 'Q-drop'. This phenomenon was observed first in 1997 and since then some effort was devoted to the understanding of the causes behind it. Still, no clear physical interpretation of the Q-drop has emerged, despite several attempts. In this contribution, I will review the experimental results for various cavities measured in many laboratories and I will try to identify common features and differences related to the Q-drop.