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首页> 外文期刊>Review of Scientific Instruments >Design and performance of a new induction furnace for heat treatment of superconducting radiofrequency niobium cavities
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Design and performance of a new induction furnace for heat treatment of superconducting radiofrequency niobium cavities

机译：新型超导射频铌腔热处理用感应炉的设计与性能

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Superconducting radio frequency (SRF) cavities made of high purity niobium (Nb) are the building blocks of many modern particle accelerators. The fabrication process includes several cycles of chemical and heat treatment at low (∼120 °C) and high (∼800 °C) temperatures. In this contribution, we describe the design and performance of an ultra-high-vacuum furnace which uses an induction heating system to heat treat SRF cavities. Cavities are heated by radiation from the Nb susceptor. By using an all-niobium hot zone, contamination of the Nb cavity by foreign elements during heat treatment is minimized and allows avoiding subsequent chemical etching. The furnace was operated up to 1400 °C with a maximum pressure of ∼1 × 10-5 Torr and the maximum achievable temperature is estimated to be higher than 2000 °C. Initial results on the performance of a single cell 1.5 GHz cavity made of ingot Nb heat treated at 1200 °C using this new induction furnace and without subsequent chemical etching showed a reduction of the RF losses by a factor of ∼2 compared to cavities made of fine-grain Nb which underwent standard chemical and heat treatments.
机译：由高纯度铌（Nb）制成的超导射频（SRF）腔是许多现代粒子加速器的基础。制造过程包括在低温（〜120°C）和高温（〜800°C）下的几个化学和热处理循环。在本文中，我们描述了超高真空炉的设计和性能，该炉使用感应加热系统对SRF腔进行热处理。 Nb基座发出的辐射会加热型腔。通过使用全铌热区，可以最大程度地减少热处理过程中异物对Nb腔的污染，并避免后续的化学蚀刻。该炉在最高压力为约1×10 -5 Torr的情况下最高可运行1400°C，估计可达到的最高温度高于2000°C。使用这种新的感应炉在1200°C热处理的锭Nb制成的单个单元1.5 GHz腔的性能的初步结果显示，与由Nb制成的腔相比，RF损耗降低了约2倍。细粒铌经过标准的化学和热处理。

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