Abstract The new Tokamak machine DTT (Divertor Tokamak Test), planned under construction by Enea Frascati Research Center, is a machine actively cooled by water. Although DTT is an intermittently operating machine, the thermal power that must be cooled is more or less 127 MW emitted within 100 seconds. Geographically the DTT site, at the Enea Frascati center, doesn’t allow the construction of water basins and the cooling wet towers. Furthermore, it doesn’t have enough water supply coming from the municipal aqueduct. Therefore, the best solution is to project a close loop cooling water system, divided into 2 circuits: primary circuits (Divertor, First Wall, ECRH, ICRH, NBI, Electrical Power Supply and Cryoplant) filled with demineralized water and a secondary circuit filled with cooling water designed for working with pressure under 16 Bars. The thermal Power transferred by the primary circuits using dedicated heat exchangers (plates or shell-and-tube) is delivered to a centralized “warm tank” developed in order to store all the energy emitted during the plasma discharge and to prevent the total water temperature in the tank from reaching boiling point. Afterwards, the warm fluid is transferred to another “cold tank” where the chillers are continuously working between two successive machine pulses every 3600 seconds. The two tanks are designed to optimize the minimum power required by the chillers. Moreover, a recovery energy system will be incorporated in order to heat all components (First Wall, Divert or, Vacuum Vessel) which should be maintained warm between the two pulses. The same logic of centralization is applied to the demineralization with reverse osmosis.

中文翻译：

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DTT 二次冷却水系统

摘要 由 Enea Frascati 研究中心计划建造的新型托卡马克机 DTT（Divertor Tokamak Test）是一种由水主动冷却的机器。尽管 DTT 是一种间歇运行的机器，但必须冷却的热功率在 100 秒内或多或少地散发出 127 MW。从地理上看，位于 Enea Frascati 中心的 DTT 站点不允许建造水盆和冷却湿塔。此外，它没有来自市政渡槽的足够供水。因此，最好的解决方案是设计一个闭环冷却水系统，分为 2 个回路：填充软化水的初级回路（分流器、第一壁、ECRH、ICRH、NBI、电源和冷冻装置）和填充软化水的次级回路。冷却水设计用于在 16 巴以下的压力下工作。使用专用换热器（板式或管壳式）的初级回路传输的热功率被输送到一个中央“温水箱”，以存储等离子体放电过程中释放的所有能量并防止总水温在罐中从达到沸点。之后，温热的液体被转移到另一个“冷罐”中，冷却器每 3600 秒在两个连续的机器脉冲之间连续工作。两个水箱旨在优化冷却器所需的最小功率。此外，将纳入一个回收能量系统，以加热所有应在两个脉冲之间保持温暖的组件（第一壁、分流器或真空容器）。同样的集中逻辑也适用于反渗透脱矿。