WeightField2 User Guide
WeightField2 User Guide
The Manual of the initial version of Weightfield explains the basics feature of the program Manual_Weightfield.pdf
Description of the program in two pages - 1 - 2
The following pages refer to WF2 5.13
The following presentations illustrate the features of Weightfield2
A)N. Cartiglia, Picosecond Workshop 2018 (pdf)
B)F. Cenna, Tredi 2014, Genova (pdf)
C)F. Cenna, RESMDD14, Firenze (pdf)
D)N. Cartiglia, IEEE 2014, (poster)
E)B. Baldassarri VCI 2016, (poster)
The results of the simulation are displayed in these tabs:
Description of the first column:
Run Configuration
Precision: the program can track every charge, or one every 2, 3...10.
For example, if precision = 4, the program tracks 1 every 4 particles.
Time step: time interval of the simulation. 1-2 ps is ~ maximum
Output File: The currents are written to a file.
Batch Mode: allows to run many events in sequence. If Rand is checked, the impact point is chosen randomly on the detector
Select Particles
#e/h: if “uniform Q” is selected, this field allows you to set how many e/h pairs are generated
X and angle: It allows to select where the particle hits the detector and its angle.
# of particles: more than one particle per event
Rand: the position is selected randomly within the strip pitch while the angle is chosen randomly around the Angle value.
Drop down menu:
Many options, mostly self explanatory
MIP uniform Q: the energy deposition is uniform, with 75 e/h per micron
MIP non uniform, Qtot = 75*Height: the energy distribution follows locally a Landau distribution, but the overall number of charges is identical to the case above
MIP non uniform, Qtot = Landau: the energy distribution follows locally a Landau distribution, and the overall number of charges is taken from the paper S. Meroli, D. Passeri and L. Servoli 11 JINST 6 P06013.
Alpha from top (bottom): the energy is deposited in the top (bottom) part of the detector for a length given by the Set range value
Current Pulse: the current input to the electronic simulation is given by a current pulse
Irradiation:
CCE: Charge collection efficiency: trapping of charge carriers
Acceptor creation: standard deep p-doping level creation
ln(Phi>5E15): acceptor creation becomes logarithmic above 5E15
Doping rem: removal of initial doping (acceptor)
Gain quenching: at high fluences, the gain is quenched due to lattice defects
DJ (Double Junction): creation of double junction due to high leakage current
Plot Settings
Draw Electric Field: superposes to the Potential plot in the Drift Potential tab the line of equal E field.
Draw Current Absolute Value: it draws the current always positive. Note: bipolar signals look strange.
Show e/h motion: it allows to see the position of e/h in the drift
Current Settings
Switch B-Field: adds a B field to the drift
Diffusion: adds the effect of diffusion at a given temperature
Charge Cloud Dispersion: it turns on charge cloud effects (simplified code)
Temperature: it controls the effect of temperature on the mobility and diffusion
To run the program:
1)First insert the values that fit your simulation,
2)Then push the Potentials button,
3)and then Currents.
4)Set button: shows the geometry you have chosen