```python
import DREAM.Settings.Equations.ColdElectronTemperature as T_cold
import DREAM.Settings.Equations.ElectricField as E_field
import DREAM.Settings.Equations.HotElectronDistribution as F_hot
import DREAM.Settings.Equations.Ions as Ions
import DREAM.Settings.Equations.RunawayElectrons as RE
import DREAM.Settings.RadialGrid as RadialGrid
import DREAM.Settings.Solver as Solver
import DREAM.Settings.TimeStepper as TimeStepper
import DREAM.Settings.CollisionHandler as Collisions
import DREAM

ds = DREAM.Settings.DREAMSettings()

# Electric field
ds.eqsys.E_field.setPrescribedData(0.6)

# Electron density
ds.eqsys.n_cold.setType(T_cold.TYPE_SELFCONSISTENT)
ds.eqsys.n_cold.setInitialProfile(5e19)

# Electron temperature
ds.eqsys.T_cold.setType(T_cold.TYPE_SELFCONSISTENT)
ds.eqsys.T_cold.setInitialProfile(1e3)

# Ion species
ds.eqsys.n_i.addIon(name='D', Z=1, iontype=Ions.IONS_DYNAMIC_FULLY_IONIZED, n=5e19)

# Disable hot-tail grid
ds.hottailgrid.setEnabled(False)

# Collision frequency mode
ds.collisions.collfreq_mode = Collisions.COLLFREQ_MODE_ULTRA_RELATIVISTIC

# Dreicer and avalanche
ds.eqsys.n_re.setAvalanche(avalanche=RE.AVALANCHE_MODE_FLUID)
ds.eqsys.n_re.setDreicer(RE.DREICER_RATE_NEURAL_NETWORK)

# Runaway electron grid
ds.runawaygrid.setEnabled(True)
ds.runawaygrid.setNp(100)
ds.runawaygrid.setNxi(50)
ds.runawaygrid.setPmax(0.5)

# Advection interpolation method
ds.eqsys.f_hot.setAdvectionInterpolationMethod(F_hot.AD_INTERP_FLUXLIMITER)

# Initialization method
ds.eqsys.f_hot.setInitialProfile(RE.INIT_ISOTROPIC, n0=1e15)

# Radial grid
ds.radialgrid.setB0(5)
ds.radialgrid.setMinorRadius(0.22)
ds.radialgrid.setWallRadius(0.22)
ds.radialgrid.setNr(1)

# Solver settings
ds.solver.setType(Solver.NONLINEAR)
ds.solver.setVerbose(True)
ds.solver.setTolerance(reltol=1e-4)

# Include fluid effects
ds.eqsys.include('fluid')

# Time stepper
ds.timestep.setTmax(1e-1)
ds.timestep.setNt(20)

# Save settings to file
ds.save('dream_settings.h5')
```