About AddWhiteNoise() not working

[Hua-Zhen_Li]

Hi experts,

I have a question about AddWhiteNoise() function. In my code I am trying to add a white noise to the induced current signal of sense wire in a diamond detector. The core code is like this:

for (const auto& cluster : track.GetClusters()) {
++nc;
nesum += cluster.electrons.size();
drift.DisablePlotting();

  for (const auto& electron : cluster.electrons) {
    drift.DriftElectron(electron.x, electron.y, electron.z, electron.t);
  }
  for (const auto& hole : cluster.ions) {
    drift.DriftHole(hole.x, hole.y, hole.z, hole.t);
  }
}
std::cout << nesum << " electrons, " 
          << nesum * ElementaryCharge << " fC.\n";

sensor.AddWhiteNoise("sign",100.,true,1.0);
//sensor.ConvoluteSignals();

outfile << "x0 = " << x0 << "  " << "y0 = " << y0 <<"\n";
outfile << "********************************************" << "\n";

I didn’t convolute the signal with transfer function, and I hope to see some fuzzing shape in the signal… but I didn’t, here is the signal I got, it is smooth, and I tried to change ENC and q0, also not working.

Do you know what could be wrong with it?

Thanks!
Huazhen

[hschindl]

Hi,
AddWhiteNoise calculates the frequency with which it adds noise pulses to the induced current such that it reproduces a given RMS equivalent-noise charge after convoluting the induced current with the transfer function. So you indeed need to specify a transfer function first.

[Hua-Zhen_Li]

Hi,

Thank you so much for help. It works after I set the transfer function first. The add-noise function is really convenient.

Cheers
Huazhen