一、前言 众所周知:自由电子脉塞的波长与磁场强度有如下关系:式中λ为波长(单位为mm),B_0为磁场强度(单位为T)。例如4mm波长自由电子脉塞要求2.65T的磁场;2mm波长则要求5.3T的磁场。即波长愈短要求磁场愈强。目前,美苏等国在发展短波长,大功率自由电子脉塞方面,广泛采用超导磁体。我国在使用常规磁 First, the preamble As we all know: the wavelength of free electron impulse plug and the magnetic field strength has the following relationship: Where λ is the wavelength (in mm), B_0 for the magnetic field strength (in T). For example, 4mm wavelength free electronic pulse plug requires a 2.65T magnetic field; 2mm wavelength requires a 5.3T magnetic field. The shorter the wavelength, the stronger the magnetic field is. At present, the United States and the Soviet Union and other countries in the development of short-wavelength, high-power free electronic pulse plug, the widespread use of superconducting magnets. My country is using conventional magnets