Solenoidal transport of low-voltage (≤ 20 kV) sheet beams

J. Pasour, K. Nguyen, T. Antonsen, P. Larsen, B. Levush
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引用次数: 1

Abstract

This paper investigates solenoidal transport and show that it is not only feasible but preferred for certain types of devices. In particular, interest in low-voltage (<20 kV), high-power (~10 kW) W-band amplifiers has led to design an extended interaction klystron (EIK) that employs a solenoidal (~9 kG) transport configuration using permanent magnets. The much stronger magnetic field that can be achieved with a solenoidal magnet configuration allows significantly higher perveance beams to be transported, and simulations show excellent beam stability with essentially no current loss over distances of several diocotron growth lengths (typically several cm for millimeter-wave (MMW) device parameters). Semi-empirical scaling laws have been developed that relate the critical beam parameters (voltage, current density, emittance, and aspect ratio) and projected amplifier performance (power and efficiency) to the magnetic focusing strength. The implications of these relationships for the design of compact, low-voltage MMW amplifiers will be presented, and a permanent magnet solenoidal field configuration suitable for a MMW EIK will be described.
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低压(≤20kv)薄板梁的电磁输运
本文对螺线管输运进行了研究,表明它不仅是可行的,而且对某些类型的器件是优选的。特别是,对低压(<20 kV),大功率(~10 kW) w波段放大器的兴趣导致设计了一种扩展相互作用速调管(EIK),该管采用永磁体螺线管(~9 kG)传输配置。通过螺线管磁铁结构可以实现更强的磁场,从而可以传输更高性能的光束,并且模拟显示出出色的光束稳定性,在几个二极管生长长度(通常为毫米波(MMW)器件参数的几厘米)的距离上基本上没有电流损失。半经验标度定律已经被开发出来,将临界光束参数(电压、电流密度、发射度和宽高比)和投影放大器性能(功率和效率)与磁聚焦强度联系起来。这些关系对紧凑型低压毫米波放大器设计的影响将被提出,并将描述适合毫米波EIK的永磁螺线管场配置。
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