Parameters for imagesim are set through parameter files.
Some template files are stored in [imagesim-home]/params/templates directory.
Explanations on the parameter files are shown below.

Parameter files

Detector parameters (template: det.json)

pixsize

Pixel size in microns.

Npix

Number of pixels on a side.

readnoise

Readout noise in electrons.

Idark

Current in dark condition including dark current and stray light (e-/sec/pix).

Fullwell

Full well in electrons.

QE

Spectral distribution of quantum efficiency.

• Wavelengths are set by W??.
• Quantum efficiencies are set by V??.

Example:

"QE": {
  "title": "Spectral distribution of quantum efficiency (W?? in um; V?? QE value)",
  "W00": 0.9,
  "V00": 0.6,
  "W01": 1.4,
  "V01": 0.6,
  "W02": 1.6,
  "V02": 0.6
}

interpix

STDDEV of interpixel flat.

intrapix

Information about the files describing intrapixel pattern.

• dirname: Name of the directory storing the intrapixel pattern files.
• filex: Name of the file defining the pattern in x direction.
• filey: Name of the file defining the pattern in y direction.

persistence

Parameters defining the persistence properties.

• tau: Array of detrapping timescales in sec.
• rho: Array of fractions of trapped electrons.

readparams

Parameters related to the resetting/reading operations of the detector.

• fsmpl: Sampling frequency in Hz.
• ncol_ch: Number of columns in a channel.
• nrow_ch: Number of rows in a channel.
• npix_pre: Number of pixels before reading each row.
• npix_pos: Number of pixels after reading each row.
• t_overhead: Overhead time between reset and the first read in sec.

gain

Conversion gain in e-/adu.