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The paper describes briefly the effect of electron velocity spread on the principal operating para-meters of a gyrotron.A method of reducing velocity spread is discussed,and a new method of mea-suring electron velocity spread in a cycloiding electron beam is presented.By use of a high precisionradial-gauge and multilobe collector,the distribution of the beam transverse velocity of a gyrotronis accurately measured.Compared with other methods conventionally used in this country and abroadsuch as those using retarding-field,pin-hole collector,this method is characterized by the fact that thespace charge effect would not modify the experimental results,and the beam velocity spread of a gyrotronunder real operating conditions can be measured.In order to characterize the beam in an overall man-ner,a new concept of relative density velocity spread is introduced in this paper.The experimental workhas been performed on a special electron beam analyser with advanced design.
The paper describes briefly the effect of electron velocity spread on the principal operating para-meters of a gyrotron. A method of reducing velocity spread is discussed, and a new method of mea-suring electron velocity spread in a cycloid electron beam is presented. BY use of a high precisionradial-gauge and multilobe collector, the distribution of the beam transverse velocity of a gyrotronis accurately measured. Compared with other methods conventionally used in this country and abroadsuch as those using retarding-field, pin-hole collector, this method is characterized by the fact that thespace charge effect would not modify the experimental results, and the beam velocity spread of a gyrotronunder real operating conditions can be measured.In order to characterize the beam in an overall man-ner, a new concept of relative density velocity spread is introduced in this paper. The experimental workhas been performed on a special electron beam analyzer with advanced design.