对170 GHz 兆瓦级回旋管单级降压收集极横向磁扫描系统进行了仿真. 采用单级降压收集极一方面回收了废电子注的部分活跃能量同时提升总输出效率超过55%. 横向磁扫描系统的引入扩展了废电子注轨迹长度至1100 mm, 使收集极表面热耗散保持在技术允许范围内. 此外仿真得到了扫描信号的调制深度以及横向线圈数的最优结果38.9%和6, 以及可接受的最大平均功率值117.1 W/cm2 . 为了确保在实际工作中的安全性和可行性, 设计了轴向开槽的收集极冷却系统, 利用软件ANSYS开展了收集极的热和流体分析. 得到收集极内外表面的最高温度各自为156.09℃ 和140.35℃. 进水口和出水口的水温范围分别为20~26.68℃和38.01~58.56℃.

The simulation of transverse field sweeping system (TFSS) for a 170 GHz, MW-class gyrotron with single-stage depressed collector (SDC) is presented in this paper. The adoption of SDC aims to recover part residual kinetic energy of spent electrons as well as to improve the total efficiency exceeding 55%. Transverse field sweeping system is coming into use to expand the spent electron trajectory length to 1100 mm to keep the specific heat dissipation on the collector surface within technically acceptable limits. Furthermore the modulation depth of sweeping signal and the number of transverse coils are simulated to get an optimal result 38.9% and 6 leading to an acceptable peak averaged power density 117.1 W/cm2 . In order to ensure the safety and feasibility in actual situation, the cooling system with axial groves for collector is also designed and the thermal and fluid analysis are carried out by commercial available software ANSYS. The maximum temperature of inner and outer collector surface are 156.09 ℃ and 140.35 ℃ respectively. The range of water temperature at the inlet and outlet are 20~26.68 ℃ and 38.01~58.56 ℃ respectively.