Hypertube Cooling and Braking Architecture for Vacuum Tube Stability

The patent changes the physical parameters of the refrigerant by using a eutectic mixture of propanediol and ethylene glycol instead of pure water. This mixture has a lower freezing point and different thermal properties, allowing it to achieve the required cooling effect at lower temperatures without requiring excessive system volume. The eutectic composition optimizes the balance between cooling capacity and system compactness.

The patent employs a composite refrigerant system consisting of a eutectic mixture (propanediol and ethylene glycol in specific ratios) combined with slush ice. This composite approach leverages the synergistic effects of the glycol mixture's low-temperature stability and slush ice's high latent heat of fusion, achieving superior cooling performance in a compact volume compared to using water alone.

The braking system is segmented into multiple independent electromagnetic braking units distributed along the train vehicle. Each unit can be controlled independently to apply braking force at different locations, achieving both effective deceleration and balanced force distribution. This segmentation allows standardization of modular components, reducing manufacturing complexity and cost.

The patent replaces traditional mechanical braking systems with electromagnetic braking mechanisms. This substitution eliminates complex mechanical linkages, reduces wear and maintenance requirements, and enables precise control of braking force through electrical signals. The electromagnetic approach simplifies the overall system structure and reduces manufacturing costs while maintaining effective braking performance.

The patent implements a feedback control system for the superconducting switch that continuously monitors operational parameters such as current, temperature, and magnetic field strength. When operating in permanent current mode, the feedback mechanism detects deviations from stable operation and automatically adjusts control parameters to maintain stability. This closed-loop control ensures reliable operation while preserving the benefits of permanent current mode.

The patent employs protective measures beforehand to prevent stability issues in permanent current mode operation. This includes pre-cooling the superconducting materials to well below their critical temperatures, implementing current limiting circuits, and designing the magnetic circuit with adequate margins to prevent quenching. These preventive measures cushion against potential instability before it occurs, ensuring reliable operation.