Optimization of pumping system for repetitively operated magnetically insulated line oscillator

作者：Xun Tao^*; Yang Hanwu; Zhang Jiande; Fan Yuwei

来源：High Power Laser and Particle Beams, 2012, 24(4): 1003-1008.

DOI：10.3788/HPLPB20122404.1003

• Characteristic time
• Experimental conditions
• Experimental test
• High-current
• Magnetically insulated line oscillator
• Molecular distribution
• Molecular movement
• Monte Carlo Simulation
• Pump system
• Pumping model
• Pumping systems
• Repetition rate
• Repetitive operations
• Simulation prediction
• Vacuum degree
• Vacuum diodes
• Vacuum environment
• Velvet cathodes

To improve the vacuum environment of an L-band, giga watt-level magnetically insulated line oscillator(MILO), an optimized pumping model was developed for the molecular movement and collision in the high-current vacuum diode chamber and the MILO tube with Monte-Carlo method. According to the three dimensional molecular distributions in MILO, a scheme of distributed pumping was proposed. In this scheme, another pump system which was close to the velvet cathode was introduced and located between the slow wave structure and antenna. Simulation predictions were verified through the experimental test carried out on Torch-01 pulser. Distributed pumping can efficiently reduce the characteristic time of pressure drop to 0.22 times that of single pumping. Moreover, at repetitive operation of MILO, distributed pumping maintains the vacuum degree in MILO better, and for our experimental condition, it can improve the MILO';s repetition rate by 5 times.

• 出版日期2012