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+//Caption:Calculate (i)-value of repeller voltage V_r ,(ii)-beam current necessary to give gap voltage of 200V, (iii)-electronic efficiency 

+//Exa:8.6

+clc;

+clear;

+close;

+e_m_ratio=1.759*10^11;//(e/m)

+V_o=500;//in volts

+R_sh=20*10^3;//in ohms

+f=8*10^9;//inHz

+w=2*%pi*f;

+n=2;//mode

+L=0.001;//spacing between repeller & cavity (in m)

+x=0.023;

+volt_diff=sqrt(V_o*(x));

+V_r=volt_diff+V_o;//repeller volatge

+Beeta_o=1;//Assuming

+J=0.582;

+V_1=200;//given (in volts)

+I_o=V_1/(R_sh*2*J);

+Theeta_o=2*%pi*f*J*10^6*2*10^-3*sqrt(V_o)/(1.579*10^11*(V_r+V_o));

+X=V_1*Theeta_o/(2*V_o);//X'

+j=0.84;//J(X')

+eff=[2*j/(2*%pi*2-%pi/2)]*100;

+disp(V_r,'Repeller voltage(in volts) =');

+disp(I_o,'Necessary beam current (in Amp.s) =');

+disp(eff,'Effeciency  (in percentage) =');
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