how to make weapon trail effect

how to make weapon trail effect like this:

click


this is my cs code :



datablock ParticleData(doomSwordEff1_p)
{
textureName = "art/particles/fireball.png";
lifetimeMS = "300";
lifetimeVarianceMS = "299";
spinSpeed = "1";
spinRandomMin = "-400";
spinRandomMax = "0";
animTexName = "art/particles/fireball.png";
colors[0] = "1 0.897638 0.795276 0.2";
colors[1] = "1 0.496063 0 0.6";
colors[2] = "0.0944882 0.0944882 0.0944882 0";
sizes[0] = "0.997986";
sizes[1] = "1.99902";
sizes[2] = "2.99701";
times[1] = "0.498039";
times[2] = "1";
times[3] = "1";
gravityCoefficient = "-1";
};

datablock ParticleEmitterData(doomSwordEff1_e)
{
particles = "doomSwordEff1_p";
blendStyle = "ADDITIVE";
ejectionPeriodMS = "10";
periodVarianceMS = "5";
ejectionVelocity = "4";
velocityVariance = "2";
ejectionOffset = "0";
thetaMax = "0";
phiVariance = "0";
};

datablock ParticleEmitterNodeData(doomSwordEff1_b){
timeMultiple = 0.1;
};


//add Effect to Obj

function addEffectToObj(%obj,%mountIndex){

%eff1 = new ParticleEmitterNode() {

dataBlock = doomSwordEff1_b;
emitter = doomSwordEff1_e;
velocity = 1;
};

%obj.mountObject(%eff1 ,%mountIndex);

}






but the effect is not continuous. how to fix