Kesar Amit, Jerby Eli
Tel-Aviv University, Ramat Aviv 69978, Israel.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Mar;65(3 Pt 2B):036503. doi: 10.1103/PhysRevE.65.036503. Epub 2002 Feb 28.
The control of gain and phase delay in a cyclotron-resonance maser (CRM) amplifier is essential for a variety of applications. In this experiment, the gain and phase-delay variations are measured with respect to controlling parameters; the electron-beam current and the axial magnetic field. Following Chu et al. [Phys. Rev. Lett. 74, 1103 (1995)], the CRM amplifier comprises of a distributed-loss waveguide to enable high gain without oscillations. Our experiment yields an amplification up to 26 dB, and a phase-delay control range of 360 degrees. In order to keep a fixed gain with the varying phase delay, the two controlling parameters (i.e., the solenoid field and the beam current) are operated together in a compensating mode. The experiment is conducted in a frequency of 7.3 GHz, with an electron beam of 18-kV voltage and 0.25-0.4-A current. The experimental results are compared with a theoretical model. Practical implementations of gain and phase control in CRM devices are discussed.
回旋共振脉塞（CRM）放大器中增益和相位延迟的控制对于各种应用至关重要。在本实验中，测量了增益和相位延迟相对于控制参数（电子束电流和轴向磁场）的变化。按照朱等人[《物理评论快报》74, 1103 (1995)]的方法，CRM放大器由分布式损耗波导组成，以实现无振荡的高增益。我们的实验实现了高达26 dB的放大以及360度的相位延迟控制范围。为了在相位延迟变化时保持固定增益，两个控制参数（即螺线管磁场和束流）以补偿模式共同操作。实验在7.3 GHz频率下进行，电子束电压为18 kV，电流为0.25 - 0.4 A。将实验结果与理论模型进行了比较。讨论了CRM器件中增益和相位控制的实际应用。
