A simple and decoupled beam stability control method for gyrotron long pulse operation
Year: 2026
Type: article
Abstract: Gyrotrons are widely used in ECRH (Electron Cyclotron Resonance Heating) systems for plasma heating in nuclear fusion experimental devices. Due to the radiation cooling effect of the gyrotron electron gun, the beam current gradually decreases during long-pulse operation, leading to unstable output power. This paper presents a long-pulse gyrotron beam current control method that regulates the beam current by adjusting the filament power supply, thereby stabilizing the gyrotron output power. The method comprises three decoupled modules: data acquisition, feedback control, and filament power control. Data acquisition is implemented via PXI, feedback control adopts a PI (Proportional-Integral) algorithm, and filament power control is realized through SCPI (Standard Commands for Programmable Instruments) over Ethernet. This approach enhances output power stability and is particularly suitable for ECRH systems without pre-installed beam current feedback mechanisms.
Source: Fusion Engineering and Design
Authors: Weiye Xu, Handong Xu, Jian Wang, Wusong He, Tao Zhang, Yongzhong Hou, Long Huang, Dajun Wu, Yong Yang
Institutions: Chinese Academy of Sciences, Institute of Plasma Physics
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,810
Awards: G4300346051, G7806307693
OpenAlex ID: W7129768965