摘要
利用线性场理论和螺旋线的导电面模型 ,推导了在强引导磁场下 ,等离子体加载螺旋线慢波结构的色散关系 .数值计算了在不同的等离子体填充密度与填充半径条件下 ,螺旋线的色散特性、耦合阻抗和行波管的小信号增益 .研究发现 ,在螺旋线中填充了等离子体以后 ,形成了一种新的混合模式 ,螺旋线的色散特性与耦合阻抗都发生了很大的变化 。
A helix-type slow wave structure filled partially with plasma is immersed in a strong longitudinal magnetic field. By means of sheath model and linear field theory, the dispersion relation of the slow wave structure is derived. Hybrid modes which are formed at frequencies at which the phase velocities of electromagnetic and electrostatic waves coincide are found. The trend of change for disperstion characteristic, interaction impedance and gain is analyzed in detail in the cases of various densities of plasma and filling radius by numerical computation. Some useful results are obtained on the basis of the discussion.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第4期914-919,共6页
Acta Physica Sinica
