Microwave Source Cathode Heater Structure for Deformation Control

The patent changes the physical parameters of the cathode heater by introducing a double helix filament structure with specific geometric parameters (pitch, diameter, spacing) and selecting materials with appropriate thermal and electromagnetic properties. This structural parameter optimization reduces deformation under electromagnetic forces and thermal expansion, thereby improving reliability while maintaining operational stability.

The patent employs composite material construction for the cathode heater, combining different materials with complementary properties - such as high-temperature resistant materials for the filament structure and materials with specific electromagnetic characteristics. This composite approach enables the cathode heater to simultaneously withstand thermal stress and electromagnetic forces, resolving the contradiction between reliability and structural stability.

The patent optimizes the operational parameters of the cathode heater by controlling the heating temperature within a specific range and adjusting the filament current parameters. The double helix structure distributes thermal load more efficiently, allowing maintained electron emission at slightly lower temperatures, thus reducing energy consumption while preventing excessive deformation that would occur at higher temperatures.

The patent implements periodic heating cycles for the cathode heater rather than continuous high-temperature operation. The heating element is activated in periodic pulses synchronized with the microwave generation cycles, maintaining sufficient electron emission efficiency while allowing thermal dissipation during off-periods. This reduces average energy consumption and mitigates cumulative thermal deformation.

The patent uses composite material structures in the cathode heater design that provide both high thermal conductivity for efficient heat transfer and high mechanical strength to resist electromagnetic forces. The composite construction allows the heater to operate at high power levels while the reinforced structure minimizes deformation-induced energy losses, effectively resolving the contradiction between heating power and energy efficiency.

The patent applies local quality optimization by varying the filament thickness, spacing, and material properties at different locations within the cathode heater structure. Regions experiencing higher electromagnetic forces have reinforced construction, while regions requiring maximum heat transfer have optimized thermal conductivity. This localized optimization allows high overall power while minimizing local deformation and associated energy losses.