WEOA05 　加速構造②/レーザー　 8月11日 会議室A 10:30 - 10:50

ファーナスベーキングによる高Q値超伝導加速空洞の探索

Investigation of high-Q superconducting accelerating cavities via furnace baking process

○井藤 隼人，荒木 隼人（高エネルギー加速器研究機構），髙橋 光太郎（総合研究大学院大学），梅森 健成（高エネルギー加速器研究機構）

○Hayato Ito, Hayato Araki (KEK), Kotaro Takahashi (SOKENDAI), Umemori Kensei (KEK)

In recent years, various surface treatments such as N-doping, N-infusion, and two-step baking have been studied to realize high-performance superconducting accelerating cavities in terms of accelerating gradient and Q-value. We report the influence of a new baking process called furnace baking on cavity performance. Baking in a vacuum furnace at temperatures ranging from 200C to 800C is applied to the cavity as the final step of cavity surface treatment, followed by high-pressure rinsing and RF measurement. We find that the Q-value is sensitive to the temperature of furnace baking, especially at furnace baking at temperatures ranging from 250C to 400C produces cavities with extremely high Q-values, similar to those obtained by N-doping. This method is simpler and potentially more reliable than previously reported heat treatment methods, and is therefore easily applicable to cavities, and is a promising future surface treatment method for mass production.