```python
import DREAM.Settings.Equations.Runaways as Runaways
import DREAM.Settings.Solver as Solver
import DREAM.Settings.TransportSettings as Transport
import DREAM
import numpy as np

ds = DREAM.Settings.DREAMSettings()

# Define the electric field strength, electron density, and temperature
E_field = 0.5  # V/m
n_e = 1e20  # m^-3
T_e = 1e3  # eV

ds.eqsys.E_field.setPrescribedData(E_field)
ds.eqsys.n_i.setPrescribedData(n_e)
ds.eqsys.T_cold.setPrescribedData(T_e)

# Momentum grid
pMax = 2.0
ds.hottailgrid.setEnabled(True)
ds.hottailgrid.setNxi(10)
ds.hottailgrid.setNp(100)
ds.hottailgrid.setPmax(pMax)

# Initial hot electron Maxwellian
ds.eqsys.f_hot.setInitialProfiles(n0=n_e, T0=T_e)

# Runaway electron grid
ds.runawaygrid.setEnabled(False)

# Dreicer and avalanche
ds.eqsys.n_re.setAvalanche(Runaways.AVALANCHE_MODE_FLUID_HESSLOW)
ds.eqsys.n_re.setDreicer(Runaways.DREICER_RATE_NEURAL_NETWORK)

# Radial grid
ds.radialgrid.setB0(5)  # Tesla
ds.radialgrid.setMinorRadius(0.22)  # meters
ds.radialgrid.setNr(10)

# Transport settings
ds.eqsys.T_cold.transport.setBoundaryCondition(Transport.BC_F_0)
ds.eqsys.T_cold.transport.setAdvectionInterpolationMethod(Transport.AD_INTERP_TCDF)
ds.eqsys.T_cold.transport.setDiffusion(Transport.DIFFUSION_MODE_SVENSSON, Drr=1.0)

# Solver settings
ds.solver.setType(Solver.NONLINEAR)
ds.solver.tolerance.set(reltol=1e-5)
ds.solver.setMaxIterations(100)

# Time stepper
ds.timestep.setTmax(1e-3)
ds.timestep.setNt(100)

# Save settings to HDF5 file
ds.save('dream_settings.h5')
```