Speaker
Description
In 2020, IHEP-CAS built a dual-vacuum furnace specifically used for Nb3Sn evaporation coating experiments. After four years of use and more than 80 experiments, in August 2024, it was found that the coated cavity produced by this furnace had serious field emission. After discussion and analysis, we suggested that the contamination originated from the coating furnace. By disassembling the inner niobium chamber, it was discovered that the problem lied in the three-face sealing structure, where the fluororubber sealing ring had severely aged at the niobium cylinder side due to high temperatures. Subsequently, the inner parts of the furnace were thoroughly cleaned, and the three-face sealing structure was modified to a two-sided sealing structure, with the niobium cylinder sealing side being removed. Once the renovation was completed and the furnace resumed operation, its performance returned to its previous state.
Funding Agency
YIPA-CAS, Grant 2023017
| I have read and accept the Privacy Policy Statement | Yes |
|---|
