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diff --git a/Microwave_and_Radar_Engineering_by_M._Kulkarni/chapter08.ipynb b/Microwave_and_Radar_Engineering_by_M._Kulkarni/chapter08.ipynb new file mode 100755 index 00000000..bbd68684 --- /dev/null +++ b/Microwave_and_Radar_Engineering_by_M._Kulkarni/chapter08.ipynb @@ -0,0 +1,966 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:d439d067395b74774cf6c48eee6faf76e1ea4d6facd8e7473f6ce6c6bc2e5f25"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "chapter08:Microwave Tubes and Circuits"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.1, Page number 336"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate dc electron velocity,dc Phase Constant,Plasma Frequency,Reduced Plasma Frequency,dc beam current density,instantaneous beam current density \n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "Vo = 14.5*10**3 #beam voltage(V)\n",
+ "i = 1.4 #beam current(A)\n",
+ "f = 10*10**9 #frequency(Hz)\n",
+ "rho_o = 10**-6 #dc electron charge density(c/m^3)\n",
+ "rho = 10**-8 #RF charge density(c/m^3)\n",
+ "V = 10**5 #velocity perturbations(m/s)\n",
+ "eo = 8.854*10**-12\n",
+ "R = 0.4\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "vo = 0.593*10**6*math.sqrt(Vo) #dc electron velocity\n",
+ "\n",
+ "#Part b\n",
+ "w = 2.*math.pi*f\n",
+ "ip = w/vo #dc phase current\n",
+ "\n",
+ "#Part c\n",
+ "wp = math.sqrt((1.759*10**11*rho_o)/eo)\n",
+ "\n",
+ "#Part d\n",
+ "wq = R*wp\n",
+ "\n",
+ "#Part e\n",
+ "Jo = rho_o * vo\n",
+ "\n",
+ "#Part f\n",
+ "J = rho*vo+rho_o*V\n",
+ "\n",
+ "#Results\n",
+ "print \"dc electron velocity =\",round((vo/1E+8),3),\"*10**8 m/sec\"\n",
+ "print \"dc phase curent =\",round(ip,2),\"rad/sec (Calculation mistake in the textbook)\"\n",
+ "print \"plasma frequency =\",round((wp/1E+8),2),\"*10**8 rad/sec\"\n",
+ "print \"Reduced plasma frequency =\",round((wq/1E+8),3),\"*10**8 rad/sec\"\n",
+ "print \"dc beam current density =\",round(Jo,1), \"A/m^2\"\n",
+ "print \"instantaeneous beam current density =\",round(J,3),\"A/m^2\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "dc electron velocity = 0.714 *10**8 m/sec\n",
+ "dc phase curent = 879.92 rad/sec (Calculation mistake in the textbook)\n",
+ "plasma frequency = 1.41 *10**8 rad/sec\n",
+ "Reduced plasma frequency = 0.564 *10**8 rad/sec\n",
+ "dc beam current density = 71.4 A/m^2\n",
+ "instantaeneous beam current density = 0.814 A/m^2\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.2, Page number 337"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate input rms voltage,output rms voltage,output power\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "Av = 15. #voltage gain(dB)\n",
+ "Pin = 5*10**-3 #input power(W)\n",
+ "Rsh_in = 30*10**3 #Rsh of input cavity(Ohms)\n",
+ "Rsh_out = 20.*10**3 #Rsh of output cavity(Ohms)\n",
+ "Rl = 40*10**4 #load impedance(Ohms)\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "V1 = math.sqrt(Pin*Rsh_in) #input rms voltage\n",
+ "\n",
+ "#Part b\n",
+ "#Av = 20log(V2/V1) db\n",
+ "V2 = V1*10**(Av/20) #deriving V2 from above equation\n",
+ "\n",
+ "#Part c\n",
+ "Pout = (V2**2)/Rsh_out #output power\n",
+ "\n",
+ "#Results\n",
+ "print \"input rms voltage =\",round(V1,2),\"V\"\n",
+ "print \"output rms voltage =\",round(V2,2),\"V\"\n",
+ "print \"output power =\",round((Pout/1E-3),1),\"mW\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "input rms voltage = 12.25 V\n",
+ "output rms voltage = 68.87 V\n",
+ "output power = 237.2 mW\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.3, Page number 338"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate input power output power,efficiency\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "n = 2 #no. of modes\n",
+ "Vo = 300 #beam voltage(V)\n",
+ "Io = 20*10**-3 #beam current(A)\n",
+ "J1X = 1.25\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "Pdc = Vo*Io #input power\n",
+ "\n",
+ "#Part b\n",
+ "Pac = (2*Pdc*J1X)/(2*math.pi*n-(math.pi/2))\n",
+ "\n",
+ "#Part c\n",
+ "N = (Pac/Pdc)*100. #efficiency\n",
+ "\n",
+ "\n",
+ "#Results\n",
+ "print \"Input power =\",round(Pdc,2),\"W\"\n",
+ "print \"Output power =\",round(Pac,2),\"W\"\n",
+ "print \"Efficiency =\",round(N,1),\"%\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input power = 6.0 W\n",
+ "Output power = 1.36 W\n",
+ "Efficiency = 22.7 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.4, Page number 338"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate Electron velocity,dc transit time of electrons,Maximum input voltage,Volatge gain\n",
+ "import math\n",
+ "\n",
+ "#Varaible declaration\n",
+ "Vo = 900 #beam voltage(V)\n",
+ "Io = 30*10**-3 #beam current(A)\n",
+ "f = 8*10**9 #frequency(Hz)\n",
+ "d = 1*10**-3 #gap spacing in either cavity(m)\n",
+ "L = 4*10**-2 #spacing between centers of cavities(m)\n",
+ "Rsh = 40*10**3 #effective shunt impedance(Ohms)\n",
+ "J1X = 0.582\n",
+ "X = 1.841\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "vo = 0.593*10**6*math.sqrt(Vo)\n",
+ "\n",
+ "#Part b\n",
+ "To = L/vo\n",
+ "\n",
+ "#Part c\n",
+ "w = 2*math.pi*f\n",
+ "theta_o = w*To\n",
+ "theta_g = (w*d)/vo\n",
+ "Bo = math.sin(theta_g/2)/(theta_g/2)\n",
+ "V1_max = (Vo*3.68)/(Bo*theta_o)\n",
+ "\n",
+ "#Part d\n",
+ "Ro = Vo/Io\n",
+ "Av = ((Bo**2)*theta_o*J1X*Rsh)/(Ro*X)\n",
+ "\n",
+ "#Results\n",
+ "print \"Electron velocity =\",round((vo/1E+6),2),\"*10**6 m/sec\"\n",
+ "print \"dc transit time of electrons =\",round((To/1E-8),3),\"*10**-8 sec\"\n",
+ "print \"Maximum input voltage =\",round(V1_max,3),\"V\"\n",
+ "print \"Volatge gain =\",round(Av,3),\"V\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Electron velocity = 17.79 *10**6 m/sec\n",
+ "dc transit time of electrons = 0.225 *10**-8 sec\n",
+ "Maximum input voltage = 41.923 V\n",
+ "Volatge gain = 23.278 V\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.5, Page number 339"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate input microwave voltage V1 in order to generate maximum output voltage, \n",
+ "#Calculate voltage gain,efficiency of the amplifier neglecting beam loading, beam loading conductance\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "Vo = 1200. #beam voltage(V)\n",
+ "Io = 28*10**-3 #beam current(A)\n",
+ "f = 8*10**9 #frequency(Hz)\n",
+ "d = 1*10**-3 #gap spacing in either cavity(m)\n",
+ "L = 4.*10**-2 #spacing between centers of cavities(m)\n",
+ "Rsh = 40*10**3 #effective shunt impedance(Ohms)\n",
+ "J1X = 0.582\n",
+ "X = 1.841\n",
+ "Go = 23.3*10**-6\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "vo = 0.593*10**6*math.sqrt(Vo)\n",
+ "w = 2*math.pi*f\n",
+ "theta_o = (w*L)/vo\n",
+ "theta_g = (w*d)/vo\n",
+ "Bo = math.sin(theta_g/2)/(theta_g/2)\n",
+ "V1_max = (Vo*3.68)/(Bo*theta_o)\n",
+ "\n",
+ "#Part b\n",
+ "Ro = Vo/Io\n",
+ "Av = ((Bo**2)*theta_o*J1X*Rsh)/(Ro*X)\n",
+ "\n",
+ "#Part c\n",
+ "V2 = 2*Io*J1X*Bo*Rsh\n",
+ "N = ((0.58*V2)/Vo)*100\n",
+ "\n",
+ "#Part d\n",
+ "Gb = (Go*((Bo**2)-(Bo*math.cos(theta_g))))/2\n",
+ "Rb = 1/Gb\n",
+ "\n",
+ "#Results\n",
+ "print \"The input microwave voltage V1 in order to generate maximum output voltage is\",round(V1_max,2),\"V\"\n",
+ "print \"The voltage gain (reflecting beam loading in the output cavity) is\",round(Av,3)\n",
+ "print \"The efficiency of the amplifier neglecting beam loading is\",round(N,2),\"%\" \n",
+ "print \"The beam loading conductance is\",round((Rb/1E+3)),\"K Ohms\"\n",
+ "print \"The value of\",round((Rb/1E+3)),\"K Ohms is very much comparable to Rsh and cannot be neglected because theta_g is quite high\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The input microwave voltage V1 in order to generate maximum output voltage is 58.71 V\n",
+ "The voltage gain (reflecting beam loading in the output cavity) is 17.058\n",
+ "The efficiency of the amplifier neglecting beam loading is 48.43 %\n",
+ "The beam loading conductance is 73.0 K Ohms\n",
+ "The value of 73.0 K Ohms is very much comparable to Rsh and cannot be neglected because theta_g is quite high\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.6, Page number 341"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate value of repeller voltage,dc necesaary to give the microwave gap of voltage of 200V,elctron efficiency\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "Vo = 500. #beam voltage(V)\n",
+ "Rsh = 20*10**3 #effective shunt impedance(Ohms)\n",
+ "f = 8*10**9 #frequency(Hz)\n",
+ "L = 1.*10**-3 #spacing between centers of cavities(m)\n",
+ "n = 2\n",
+ "e_m = 1.759*10**11\n",
+ "V1 = 200\n",
+ "J1X = 0.582\n",
+ "\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "w = 2*math.pi*f\n",
+ "x = (e_m*((2*math.pi*n)-(math.pi/2))**2)/(8*(w**2)*(L**2))\n",
+ "y = math.sqrt(Vo/x)\n",
+ "Vr = y+Vo\n",
+ "\n",
+ "#Part b\n",
+ "Bo = 1 #Assumption\n",
+ "Io = V1/(2*J1X*Rsh)\n",
+ "\n",
+ "#Part c\n",
+ "vo = 0.593*10**6*math.sqrt(Vo)\n",
+ "theta_o = (w*2*L*vo)/(e_m*(Vr+Vo))\n",
+ "Bi = 1 #Assumption\n",
+ "X_dash = (V1*theta_o)/(2*Vo)\n",
+ "X = 1.51 #from graph\n",
+ "J1X = 0.84\n",
+ "N = ((2*J1X)/((2*math.pi*n)-(math.pi/2)))*100\n",
+ "\n",
+ "#Results\n",
+ "print \"The value of repeller voltage is\",round(Vr,2),\"V (Calculation mistake in the textbook)\"\n",
+ "print \"The dc necesaary to give the microwave gap of voltage of 200V is\",round((Io/1E-3),2),\"mA\"\n",
+ "print \"The elctron efficiency is\", round(N,2),\"%\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The value of repeller voltage is 1189.36 V (Calculation mistake in the textbook)\n",
+ "The dc necesaary to give the microwave gap of voltage of 200V is 8.59 mA\n",
+ "The elctron efficiency is 15.28 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.7, Page number 342"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate efficiency of the reflex klystron,total power output,elctron efficiency\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "n = 1 #no. of modes\n",
+ "Pdc = 40*10**-3 #input power(W)\n",
+ "V1_Vo = 0.278 #ratio\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "N = (V1_Vo*3*math.pi)/4\n",
+ "\n",
+ "#Part b \n",
+ "Pout = (8.91*Pdc)/100\n",
+ "\n",
+ "#Part c\n",
+ "Pl = (Pout*80)/100\n",
+ "\n",
+ "#Results\n",
+ "print \"The efficiency of the reflex klystron is\",round(N,3)\n",
+ "print \"The total power output is\",round((Pout/1E-3),3),\"W\"\n",
+ "print \"The power delivered to the load is\",round((Pl/1E-3),2),\"W\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The efficiency of the reflex klystron is 0.655\n",
+ "The total power output is 3.564 W\n",
+ "The power delivered to the load is 2.85 W\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.8, Page number 343"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate Hull cut-off voltage,Cut-off magnetic flux density,Cyclotron frequency\n",
+ "#chapter-8 page 342 example 8.8\n",
+ "#For a circular magnetron\n",
+ "import math\n",
+ "a=0.15##inner radius in m\n",
+ "b=0.45##outer radius in m\n",
+ "B=1.2*10**(-3)##magnetic flux density in Wb/sqm\n",
+ "x=1.759*10**11##Value of e/m in C/kg\n",
+ "V=6000.##beam voltage in V\n",
+ "\n",
+ "#CALCULATION\n",
+ "V0=((x/8.)*(B**2.)*(b**2.)*(1.-(a/b)**2.)**2.)/1000.##Hull cut-off voltage in kV\n",
+ "Bc=((math.sqrt(8.*(V/x)))/(b*(1.-(a/b)**2.)))*1000.##Cut-off magnetic flux density in mWb/sqm\n",
+ "fc=((x*B)/(2.*(math.pi)))/10.**9.##Cyclotron frequency in GHz\n",
+ "\n",
+ "#OUTPUT\n",
+ "print '%s %2.3f %s %s %3.3f %s %s %.4f %s' %('\\nHull cut-off voltage is V0=',V0,'kV','\\nCut-off magnetic flux density is Bc=',Bc,'mWb/sqm','\\nCyclotron frequency is fc=',fc,'GHz')#\n",
+ "\n",
+ "#Check the answers once \n",
+ "#Correct answers are\n",
+ "#Hull cut-off voltage is V0=5.066 kV\n",
+ "#Cut-off magnetic flux density is Bc=1.305953 mWb/sqm \n",
+ "#Cyclotron frequency is fc=0.0336 GHz \n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Hull cut-off voltage is V0= 5.066 kV \n",
+ "Cut-off magnetic flux density is Bc= 1.306 mWb/sqm \n",
+ "Cyclotron frequency is fc= 0.0336 GHz\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.9, Page number 343"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate Axial phase velocity, anode voltage\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "d = 2*10**-3 #diameter of helical TWT(m)\n",
+ "n = 50. #no. of turns per cm\n",
+ "v = 3*10**8 #velocity of light(m/s)\n",
+ "m = 9.1*10**-31 #mass of electron\n",
+ "e = 1.6*10**-19 #charge on electron\n",
+ "\n",
+ "#Calculations\n",
+ "p = 1/n*10**-2 #pitch(m)\n",
+ "c = math.pi*d #circumference(m)\n",
+ "Vp = (v*p)/c \n",
+ "\n",
+ "Vo = (m*(Vp**2))/(2*e)\n",
+ "\n",
+ "#Results\n",
+ "print \"Axial phase velociity =\",round(Vp,2),\"m/sec\"\n",
+ "print \"Anode voltage =\",round(Vo,2),\"V(Calculation mistake in the textbook)\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Axial phase velociity = 9549296.59 m/sec\n",
+ "Anode voltage = 259.32 V(Calculation mistake in the textbook)\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.10, Page number 344"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate dc electron velocity,Transit time,Input voltage,Voltage gain \n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "Vo = 900 #beam voltage(V)\n",
+ "Io = 30.*10**-3 #beam current(A)\n",
+ "f = 8.*10**9 #frequency(Hz)\n",
+ "d = 1.*10**-3 #gap spacing in either cavity(m)\n",
+ "L = 4.*10**-2 #spacing between centres of cavity(m)\n",
+ "Rsh = 40.*10**3 #effective shunt impedance(Ohms)\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "vo = 0.593*10**6*math.sqrt(Vo)\n",
+ "\n",
+ "#Part b\n",
+ "Tt = d/vo\n",
+ "\n",
+ "#Part c\n",
+ "w = 2*math.pi*f\n",
+ "theta_g = (w*d)/vo\n",
+ "Bo = math.sin(theta_g/2)/(theta_g/2) #Beam coupling coefficient\n",
+ "theta_o = (w*L)/vo #dc transit angle\n",
+ "#For maximum o/p volltage,\n",
+ "J1X = 0.582\n",
+ "X = 1.841\n",
+ "V1max = (2*Vo*X)/(Bo*theta_o)\n",
+ "\n",
+ "#Part d\n",
+ "Av = (Bo**2*theta_o*J1X*Rsh)/(Io*X)\n",
+ "\n",
+ "#Results\n",
+ "print \"dc electron velocity =\",round((vo/1E+7),1),\"*10**7 m/sec\"\n",
+ "print \"Transit time =\",round((Tt/1E-10),2),\"*10^-10 s\"\n",
+ "print \"Input voltage for maximum output voltage =\",round(V1max,2),\"V\"\n",
+ "print \"Voltage gain =\",round((Av/1E+6),2),\"dB\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "dc electron velocity = 1.8 *10**7 m/sec\n",
+ "Transit time = 0.56 *10^-10 s\n",
+ "Input voltage for maximum output voltage = 41.95 V\n",
+ "Voltage gain = 23.28 dB\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.11, Page number 345"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate dc electron velocity,dc phase constant,plasma frequency ,Reduced plasma frequency ,dc beam current density,instantaeneous beam current density\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "Vo = 20*10**3 #beam voltage(V)\n",
+ "Io = 2 #beam current(A)\n",
+ "f = 9*10**9 #frequency(Hz)\n",
+ "rho_o = 10**-6 #dc electron charge density(c/m^3)\n",
+ "rho = 10**-8 #RF charge density(c/m^3)\n",
+ "V = 10**5 #velocity perturbations(m/s)\n",
+ "eo = 8.854*10**-12\n",
+ "R = 0.5\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "vo = 0.59*10**6*math.sqrt(Vo)\n",
+ "\n",
+ "#Part b\n",
+ "w = 2.*math.pi*f\n",
+ "ip = w/vo #dc phase current\n",
+ "\n",
+ "#Part c\n",
+ "wp = math.sqrt((1.759*10**11*rho_o)/eo)\n",
+ "\n",
+ "#Part d\n",
+ "wq = R*wp\n",
+ "\n",
+ "#Part e\n",
+ "Jo = rho_o * vo\n",
+ "\n",
+ "#Part f\n",
+ "J = rho*vo-rho_o*V\n",
+ "\n",
+ "#Results\n",
+ "print \"dc electron velocity =\",round((vo/1E+7),3),\"*10**7 m/sec\"\n",
+ "print \"dc phase constant =\",round(ip,2),\"rad/sec (Calculation mistake in the textbook)\"\n",
+ "print \"plasma frequency =\",round((wp/1E+8),2),\"*10**8 rad/sec\"\n",
+ "print \"Reduced plasma frequency =\",round((wq/1E+8),3),\"*10**8 rad/sec\"\n",
+ "print \"dc beam current density =\",round(Jo,2), \"A/m^2\"\n",
+ "print \"instantaeneous beam current density =\",round(J,4),\"A/m^2\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "dc electron velocity = 8.344 *10**7 m/sec\n",
+ "dc phase constant = 677.73 rad/sec (Calculation mistake in the textbook)\n",
+ "plasma frequency = 1.41 *10**8 rad/sec\n",
+ "Reduced plasma frequency = 0.705 *10**8 rad/sec\n",
+ "dc beam current density = 83.44 A/m^2\n",
+ "instantaeneous beam current density = 0.7344 A/m^2\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.12, Page number 345"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate Transit angle \n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "f = 5*10**9 #frequency(Hz)\n",
+ "Vo = 1000 #operating voltage(V)\n",
+ "n = 1.75 #no. of turns\n",
+ "Vr = -500 #repeller voltage(V)\n",
+ "d = 2*10**-3 #cavity gap(m)\n",
+ "\n",
+ "#Calculations\n",
+ "w = 2*math.pi*f\n",
+ "uo = 5.93*10**5*math.sqrt(Vo)\n",
+ "theta_g = (w*d)/uo\n",
+ "\n",
+ "#Results\n",
+ "print \"Transit angle =\",round(theta_g,3),\"radians\"\n",
+ "print \"\\nThe length of drift region cannot be computed as the value of F is not given\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Transit angle = 3.351 radians\n",
+ "\n",
+ "The length of drift region cannot be computed as the value of F is not given\n"
+ ]
+ }
+ ],
+ "prompt_number": 12
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.13, Page number 346"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate Input RF voltage ,Voltage gain ,efficiency \n",
+ "#Variable declaration\n",
+ "import math\n",
+ "f = 10*10**9 #frequency(Hz)\n",
+ "Vo = 1200 #beam voltage(V)\n",
+ "Io = 30*10**-3 #beam current(A)\n",
+ "d = 1*10**-3 #diameter(m)\n",
+ "Rsh = 40*10**3 #shunt resistance(Ohms)\n",
+ "L = 4*10**-2 #length(m)\n",
+ "X = 1.84\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "vo = 0.59*10**6*math.sqrt(Vo)\n",
+ "w = 2*math.pi*f\n",
+ "theta_o = (w*L)/vo\n",
+ "V1 = (2*X*Vo)/theta_o\n",
+ "theta_g = (theta_o*d)/L\n",
+ "Bi = (math.sin(theta_g/2))/(theta_g/2)\n",
+ "V1max = V1/Bi\n",
+ "\n",
+ "#Part b\n",
+ "J1X = 0.58 #from table\n",
+ "I2 = 2*Io*J1X\n",
+ "V2 = Bi*I2*Rsh\n",
+ "A = V2/V1\n",
+ "Av = 20*math.log10(A)\n",
+ "\n",
+ "#Part c\n",
+ "N = ((0.58*V2)/Vo)*100\n",
+ "\n",
+ "#Results\n",
+ "print \"Input RF voltage is\",round(V1max,3),\"V\" \n",
+ "print \"Voltage gain is\",round(Av,2),\"dB\"\n",
+ "print \"efficiency is\",round(N,2),\"%\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input RF voltage is 55.231 V\n",
+ "Voltage gain is 28.03 dB\n",
+ "efficiency is 43.75 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 13
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.14, Page number 347"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate Cyclotron angular frequency,Hull cut-off voltage,Cut-off magnetic flux density\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "Vo = 30*10**3 #beam voltage(V)\n",
+ "Io = 80 #beam current(A)\n",
+ "Bo = 0.01 #Wb/m**2\n",
+ "a = 4*10**-2 #length of magnetron(m)\n",
+ "b = 8*10**-2 #breadth of magnetron(m)\n",
+ "e = 1.6*10**-19 #charge on electron(C)\n",
+ "m = 9.1*10**-31 #mass of electron\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "w = (e*Bo)/m\n",
+ "\n",
+ "#Part b\n",
+ "Vhc = (e*(Bo**2)*(b**2)*((1-((a/b)**2))**2))/(8*m)\n",
+ "\n",
+ "#PArt c\n",
+ "Bc = ((8*Vo*(m/e))**0.5)/(b*(1-((a/b)**2)))\n",
+ "\n",
+ "#Results\n",
+ "print \"Cyclotron angular frequency =\",round((w/1E+9),3),\"*10**9 rad/s\"\n",
+ "print \"Hull cut-off voltage =\",round((Vhc/1E+3),4),\"kV\"\n",
+ "print \"Cut-off magnetic flux density =\",round((Bc/1E-3),3),\"mWb/m**2\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Cyclotron angular frequency = 1.758 *10**9 rad/s\n",
+ "Hull cut-off voltage = 7.9121 kV\n",
+ "Cut-off magnetic flux density = 19.472 mWb/m**2\n"
+ ]
+ }
+ ],
+ "prompt_number": 14
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.15, Page number 348"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate Input power,Output power,Efficiency\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "n = 2 #mode\n",
+ "Vo = 280 #beam volatge(V)\n",
+ "Io = 22*10**-3 #beam current(A)\n",
+ "V1 = 30 #signal voltage(V)\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "Pdc = Vo*Io\n",
+ "\n",
+ "#Part b\n",
+ "J1X = 1.25 #from table\n",
+ "Pac = (2*Pdc*J1X)/((2*n*math.pi)-(math.pi/2))\n",
+ "\n",
+ "#Part c\n",
+ "N = (Pac/Pdc)*100\n",
+ "\n",
+ "#Results\n",
+ "print \"Input power =\",round(Pdc,2),\"W\"\n",
+ "print \"Output power =\",round(Pac,2),\"W\"\n",
+ "print \"Efficiency =\",round(N,2),\"%\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Input power = 6.16 W\n",
+ "Output power = 1.4 W\n",
+ "Efficiency = 22.74 %\n"
+ ]
+ }
+ ],
+ "prompt_number": 15
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 8.16, Page number 348"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate\n",
+ "\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration\n",
+ "f = 8*10**9 #frequency(Hz)\n",
+ "Vo = 300 #beam voltage(V)\n",
+ "Rsh = 20*10**3 #shunt resistance(Ohms)\n",
+ "L = 1*10**-3 #length(m)\n",
+ "V1 = 200 #gap voltage(V)\n",
+ "e_m = 1.759*10**11\n",
+ "n = 2 #mode\n",
+ "\n",
+ "#Calculations\n",
+ "#Part a\n",
+ "w = 2*math.pi*f\n",
+ "x = (e_m*((2*math.pi*n)-(math.pi/2))**2)/(8*(w**2)*(L**2))\n",
+ "y = math.sqrt(Vo/x)\n",
+ "Vr = y+Vo\n",
+ "\n",
+ "#Part b\n",
+ "Bo = 1 #assumption\n",
+ "J1X = 0.582 #from table\n",
+ "Io = V1/(2*J1X*Rsh)\n",
+ "\n",
+ "#Results\n",
+ "print \"Repeller voltage =\",round(Vr,3),\"V\"\n",
+ "print \"Beam current =\",round((Io/1E-3),2),\"mA\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Repeller voltage = 833.98 V\n",
+ "Beam current = 8.59 mA\n"
+ ]
+ }
+ ],
+ "prompt_number": 16
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
\ No newline at end of file |