English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A Temperature mapping (T-map) system for Superconducting Radio Frequency(SRF) cavities consists of a thermometer array positioned precisely on anexterior cavity wall, capable of detecting small increases in temperature;therefore it is a powerful tool for research on the quality factor (Q0) of SRFcavities. A new multi-cell T-mapping system is has been developed at CornellUniversity. The system has nearly two thousand thermometers to cover 7-cell SRFcavities for Cornell ERL project. A new multiplexing scheme was adopted toreduce number of wires. A 1mK resolution of the temperature increase Delta T isachieved. A 9-cell cavity of TESLA geometry was tested with the T-map system.By converting Delta T to power loss and quality factor, it has been found thatfor this cavity, most surface losses were generated by the first cell when theaccelerating gradient is increased above 15MV/m. The comparison of Q-valuebetween with and without hotspots shows the heating on cavity wall degradedcavity Q0 about 1.65 times. The power loss on the hotspots is about 40% of thetotal power. Effective and intuitive ways of displaying surface properties ofthe cavity interior, e.g. the residual resistivity, will be shown.

A temperature-mapping system for multi-cell SRF accelerating cavities