For a large-scale cyclotron using normal conducting magnet coils, 10 h or more are required to obtain a highly stable magnetic field because heat transfer from the coils changes the temperature of the magnets gradually. To suppress the heat transfer and stabilize the magnet temperature in the TIARA K110 cyclotron, water-cooled copper plates were inserted between the main coil and the magnetic yoke. The heat generated by the main coil depends on its circulating current, which depends on the accelerated ion beam. To stabilize the magnet temperature, a technique was developed to control the temperature of the cooling water of the copper plates depending on the main coil current. Consequently, the temperature of the magnet was stabilized successfully to 24 ± 0.3 °C for various ion beams, and the magnetic field was maintained at ΔB/B = 1 × 10⁻⁵ after a few hours from initiating cyclotron operation.

中文翻译：

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K110可变能量回旋加速器磁体的温度稳定性

对于使用常规导电磁体线圈的大型回旋加速器，需要10个小时或更长时间才能获得高度稳定的磁场，因为来自线圈的热量传递会逐渐改变磁体的温度。为了抑制热传递并稳定TIARA K110回旋加速器中的磁体温度，在主线圈和磁轭之间插入了水冷铜板。主线圈产生的热量取决于其循环电流，该电流取决于加速的离子束。为了使磁铁温度稳定，开发了根据主线圈电流来控制铜板的冷却水温度的技术。因此，对于各种离子束，磁体的温度成功地稳定在24±0.3°C，磁场保持在Δ启动回旋加速器几个小时后，B / B = 1×10 ^-5。