cryomodule在线监测技术的研究

Cryomodule is essential for superconducting accelerators. It is a sealing device which can provide conditions of isothermal in low temperature and thermal insulation.Because of low-temperature (4K) and invisibility, it remains a longstanding challenge in alignment and monitoring. Existing laser tracker and micro alignment telescope can not complete online monitoring for cryomodule. In view of the above shortcomings, stretched-wire monitoring system was proposed for online monitoring. The program will deeply study the deformation of vacuum condition in low temperature based on the offline monitoring which has completed early.. To resolve the continuous online monitoring, and establish an effective forecasting model for deformation, the program will use collaborative calibration, cold testing and verification in low-temperature. By improving mechanical structure, this program will monitor both linear and circular accelerators. The program will promote the development of automated collimation and monitoring technology,and develop an online monitoring and forecasting program with independent intellectual property rights.

作为超导加速器的核心组件，Cryomodule是能够提供低温恒温条件和与外界热绝缘的密封装置。然而，由于超低温(4K)和不可通视特性，其在线监测问题一直困扰着准直安装人员。现有的激光跟踪仪和测微准直望远镜，都无法完成其在线监测任务。鉴于以上原因,本项目将采用拉伸线准直监测系统，并在前期离线监测的基础上,深入研究冷质量元件在线运行时连续时空的真空与低温变形。. 该方案拟采用机械和电子学协同标定、低温测试与验证手段，解决cryomodule等直线型元件的连续实时自动化在线监测，并探讨建立有效的变形预报模型。通过准直工装的改进设计，旨在实现环形加速器元件的自动化在线监测。该方案的实施将从根本上阐明真空低温下冷质量元件的变形机制,获得超导腔和螺线管的变形规律;同时促进国内外自动化在线监测技术的研究进展，开发出具有自主知识产权的在线准直监测与变形预报方案。

作为低温超导直线加速器的关键元件，Cryomodule能够提供低温恒温条件，使得加速器得以连续运行。然而由于超低温和内部密封不通视，长期以来其低温准直一直困扰着Cryomodule设计与准直人员。为了从根本上理解Cryomodule的变形机理，验证并促进其设计理论的优化发展，本项目使用WPM拉伸线准直监测系统，实现真空低温变形的连续监测。经过CST的阻抗匹配、机械加工和MAPPING标定，显示WPM测量精度为20 um。特别是通过多次真空低温变形的测试，成功建立表达其真空低温变形的数学模型（拟合精度10 um），并成功预测具有重复性的真空、低温变形（预测精度20 um）。相信WPM解决了低温恒温器的在线低温准直问题，而且必深入理解了Cryomodule的真空低温变形机理，填补了HIAF和CIADS超导直线恒温器低温准直方面的空白。同时该项目促进了自动化准直监测技术的发展，而且开发出了具有自主知识产权的变形监测与预测预警方案。