In high-power fusion gyrotrons, the maximum heat-load on the wall of the interaction section is in the order of 2 kW/cm, which is the major limiting technological factor for output power and pulse-length of the tube. The ongoing gyrotron development demands a very effective cavity cooling system for optimum gyrotron operation. In this work, the experimental investigation of a mini-channel cavity cooling using a mock-up test set-up is described. The mock-up test set-up will be used to experimentally validate the predictive simulation results and verify the mini-channel cooling performance. It is crucial for validation of the mini-channel cooling properties to determine the amount of the heat load introduced in the cavity wall by an induction heater. In order to estimate that heat load, full 3D electromagnetic simulations have been performed using the CST Studio Suite® software. A suitable calibration factor for the load deposited in the mock-up inner wall is identified after numerical investigation by a 3D thermal model. Calorimetry measurements are performed and the experimental results are compared with the simulation results obtained with a 3D thermal-hydraulic model, using the commercial software STAR-CCM+. When the calibration factor is applied, the experimental calorimetry is well reproduced by the simulations.

中文翻译：

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校准 KIT 测试装置，用于配备迷你通道的回旋腔全尺寸模型的冷却测试

在高功率聚变回旋管中，相互作用段管壁的最大热负荷为2kW/cm量级，这是限制管子输出功率和脉冲长度的主要技术因素。正在进行的回旋管开发需要非常有效的腔体冷却系统，以实现最佳回旋管运行。在这项工作中，描述了使用模型测试装置对微通道腔体冷却进行的实验研究。模型测试装置将用于通过实验验证预测模拟结果并验证微通道冷却性能。确定感应加热器在腔壁中引入的热负荷量对于验证微通道冷却特性至关重要。为了估计热负荷，使用 CST Studio Suite® 软件进行了完整的 3D 电磁模拟。通过 3D 热模型进行数值研究后，确定了模型内壁负载的合适校准系数。使用商业软件 STAR-CCM+ 进行量热测量，并将实验结果与 3D 热水力模型获得的模拟结果进行比较。当应用校准因子时，模拟可以很好地再现实验量热法。