Vacuum Pressure Impregnation Process in Superconducting Coils: Best Practice
Vacuum Pressure Impregnation Process in Superconducting Coils: Best Practice
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DOI：
10.1109/tasc.2011.2175896
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发表时间：
2012-06
影响因子：
1.8
通讯作者：
D. Evans;J. Knaster;H. Rajainmaki
中科院分区：
文献类型：
--
作者：
D. Evans;J. Knaster;H. Rajainmaki
与超导磁体的设计和构造相关的技术在过去三十年中发生了巨大的变化，导致其复杂性的总体增加。它们的使用已经从粒子物理学通过医学应用（如MRI）转移到聚变技术所需的超大磁体，其中HV绝缘的最佳质量是实现设计性能的关键步骤。真空压力浸渍（VPI）技术--一种更为广为人知的真空辅助树脂传递模塑（VARTM）的特别改进的情况--已经成为用于加固大型超导磁体的电绝缘的最常见的工艺。为了获得成功，VPI工艺要求对许多步骤进行详细的关注，即：卷材干燥，树脂脱气和卷材浸渍。商业敏感性意味着没有公开的信息交流，因此，不同组织的VPI流程的许多细节可能有所不同。本文旨在填补这一空白，并将详细讨论：（1）所有必需的步骤，每个步骤中的主要风险，（2）每个步骤中常用的方法，以优化工艺控制和（3）工具，以尽量减少浸渍过程中的故障风险。
The technology associated with the design and construction of superconducting magnets has evolved dramatically over the last three decades leading to an overall increase in their complexity. Their use has moved from particle physics through medical applications such as MRI to the very large magnets demanded by fusion technology, where the optimal quality of the HV insulation is a critical step in achieving the design performance. The Vacuum Pressure Impregnation (VPI) technique-a particularly refined case of the more widely known Vacuum Assisted Resin Transfer Mould (VARTM)-has become the most common process for the consolidating electrical insulation of large superconducting magnets. To achieve success with the VPI process demands that detailed attention is paid to many steps, namely: coil drying, resin degassing and coil impregnation. Commercial sensitivity has meant that there has not been a well-published exchange of information and therefore many details of the VPI process may vary in different organizations. The present paper aims at filling this gap and will discuss in detail: (1) all required steps with the main risks in each of them, (2) commonly used methods in each of the steps for optimized control of the process and (3) tooling to minimize risk of failure during impregnation.