Keyword : fe

 

FLYCHK can compute the population distributions when there is a beam or non-Maxwellian electron energy distribution with thermal electrons. Please make sure that thermal electrons are included with electron temperature and density information.

format explanation
fe file filename option reading the non-Maxwellian electron distribution. This is performed by using the option fe file filename, where the filename is the name of a text file with a history of the electron distribution function as a function of energy in eV, at given times.

 

Note that the collisional rates are computed by integrating cross-sections over the distribution function. These integrals contribute to a substantial increase in the amount of work performed to fill the rate matrix, so that the timing can be much slower than the cases without the non-Maxwellian electron distribution function.

specifying the frequency-dependent radiation field

format example
# of times
# of electron energy grids		 2 3
electron energy grid [eV]
specified only once		 4.49E+03 4.5E+03 4.51E+03
1st time-step [s]
electron density of the beam [#/cm3] 		0.0E+00 1.0E+11
fe(E) [#/cm3/eV0.5] at 1st time-step 1.0E-20 1.49071E-03 1.0E-20
2nd time-step [s]
electron density of the beam [#/cm3]		 1.0E-09 1.0E+11
fe(E) [#/cm3/eV0.5] at 2nd time-step 1.0E-20 1.49071E-03 1.0E-20

Note that the definition of the electron energy distribution function here is for electron density per energy n(E) as follows:

n(E)dE = sqrt(E)fe(E)dE

Therefore the fe(E) for the Maxwellian distribution at Te is given as :

fe(E) = 2/sqrt(p)exp(-E/Te)/Te1.5

The maximum number of electron energy grid is 500. Please make sure that each line does not exceed more than 120 characters. The program will read # of data based on the # of times and the # of energy grid points specified on the first line. Note that the lines starting with "c" or "#" will be ignored