when i used garfield++ to calculate gas properties like ElectronVelocity, ElectronDiffusionL, ElectronDiffusionT, ElectronTownsend, ElectronAttachment. while the electricfield is set as from 50V/cm to 1000V/cm，as calculating the 700.0000 VOLTS/CM points, the errors occured:
“WARNING ENERGY OUT OF RANGE,INCREASE ELECTRON ENERGY INTEGRATION RANGE”
but when the electricfield is set as from 650V/cm to 850V/cm, everything works ok.
What is the gas mixture you are using and for what pressure are you running the calculation?
The gas is CH4 + Ar, the ratio of CH4 is from 0 to 50%，the pressure is 760 mm Hg
Thanks. At what fraction of CH4 specifically do you get this error message?
CH4 is 0%, Ar is 100%
Hi,
running Magboltz for pure Argon at atmospheric pressure and 700 V/cm, I can’t reproduce the problem. Is one of the parameters different in your program?
PROGRAM MAGBOLTZ 2 VERSION 11.13
MONTE CARLO SOLUTION FOR MIXTURE OF 1 GASES.
------------------------------------------------------
GASES USED PERCENTAGE USED
ARGON ANISOTROPIC 2014 100.0000
GAS TEMPERATURE = 20.0 DEGREES CENTIGRADE.
GAS PRESSURE = 760.0 TORR.
INTEGRATION FROM 0.0 TO 11.31 EV. IN 4000 STEPS.
PENNING EFFECTS NOT INCLUDED
ANISOTROPIC SCATTERING TYPE 2 (OKHRIMOVSKYY) USED IF AVAILABLE
LONG DECORRELATION LENGTH =2000000 COLLISIONS.
THERMAL MOTION OF GAS NOT INCLUDED
ELECTRIC FIELD = 700.0000 VOLTS/CM.
MAGNETIC FIELD = 0.0000 KILOGAUSS.
ANGLE BETWEEN ELECTRIC AND MAGNETIC FIELD = 90.000 DEGREES.
CYCLOTRON FREQ. = 0.000D+00 RADIANS/PICOSECOND
INITIAL ELECTRON ENERGY = 0.226 EV.
TOTAL NUMBER OF REAL COLLISIONS = 400000000
I will reply you later.
GASES USED PERCENTAGE USED
ARGON ANISOTROPIC 2014 100.0000
GAS TEMPERATURE = 20.0 DEGREES CENTIGRADE.
GAS PRESSURE = 760.0 TORR.
INTEGRATION FROM 0.0 TO 11.31 EV. IN 4000 STEPS.
PENNING EFFECTS NOT INCLUDED
ANISOTROPIC SCATTERING TYPE 2 (OKHRIMOVSKYY) USED IF AVAILABLE
LONG DECORRELATION LENGTH =2000000 COLLISIONS.
THERMAL MOTION OF GAS NOT INCLUDED
ELECTRIC FIELD = 700.0000 VOLTS/CM.
MAGNETIC FIELD = 0.0000 KILOGAUSS.
ANGLE BETWEEN ELECTRIC AND MAGNETIC FIELD = 90.000 DEGREES.
CYCLOTRON FREQ. = 0.000D+00 RADIANS/PICOSECOND
INITIAL ELECTRON ENERGY = 0.226 EV.
TOTAL NUMBER OF REAL COLLISIONS = 400000000
NULL COLLISION FREQUENCY AT 8 EQUALLY SPACED ENERGY INTERVALS (*10**12/SEC)
0.111D+02 0.111D+02 0.111D+02 0.111D+02
0.111D+02 0.111D+02 0.111D+02 0.111D+02
REAL COLLISION FREQUENCY AT 8 EQUALLY SPACED ENERGY INTERVALS (*10**12/SEC)
0.958D-01 0.741D+00 0.171D+01 0.291D+01
0.447D+01 0.632D+01 0.834D+01 0.103D+02
VEL POS TIME ENERGY COUNT DIFXX DIFYY DIFZZ
3.84 0.690D-01 0.180D+08 3.8728 20 4042.5 4778.6 0.0
WARNING ENERGY OUT OF RANGE,INCREASE ELECTRON ENERGY INTEGRATION RANGE
(base) root@llh-virtual-machine:/home/llh/Garfield/Patent/build#
And, just to be sure, you are also using the HEAD version of Garfield++, i. e. the first line of the Magboltz output is this one?
sorry, the first line of my Magboltz output is this one:
PROGRAM MAGBOLTZ 2 VERSION 11.11
Can you update your installation of Garfield++ to the latest version from the repository, re-build the project and try again?
yes, i will update my program
sorry, the same problem occurs:
PROGRAM MAGBOLTZ 2 VERSION 11.13
MONTE CARLO SOLUTION FOR MIXTURE OF 1 GASES.
------------------------------------------------------
GASES USED PERCENTAGE USED
ARGON ANISOTROPIC 2014 100.0000
GAS TEMPERATURE = 20.0 DEGREES CENTIGRADE.
GAS PRESSURE = 760.0 TORR.
INTEGRATION FROM 0.0 TO 11.31 EV. IN 4000 STEPS.
PENNING EFFECTS NOT INCLUDED
ANISOTROPIC SCATTERING TYPE 2 (OKHRIMOVSKYY) USED IF AVAILABLE
LONG DECORRELATION LENGTH =2000000 COLLISIONS.
THERMAL MOTION OF GAS NOT INCLUDED
ELECTRIC FIELD = 700.0000 VOLTS/CM.
MAGNETIC FIELD = 0.0000 KILOGAUSS.
ANGLE BETWEEN ELECTRIC AND MAGNETIC FIELD = 90.000 DEGREES.
CYCLOTRON FREQ. = 0.000D+00 RADIANS/PICOSECOND
INITIAL ELECTRON ENERGY = 0.226 EV.
TOTAL NUMBER OF REAL COLLISIONS = 400000000
NULL COLLISION FREQUENCY AT 8 EQUALLY SPACED ENERGY INTERVALS (*10**12/SEC)
0.111D+02 0.111D+02 0.111D+02 0.111D+02
0.111D+02 0.111D+02 0.111D+02 0.111D+02
REAL COLLISION FREQUENCY AT 8 EQUALLY SPACED ENERGY INTERVALS (*10**12/SEC)
0.958D-01 0.741D+00 0.171D+01 0.291D+01
0.447D+01 0.632D+01 0.834D+01 0.103D+02
VEL POS TIME ENERGY COUNT DIFXX DIFYY DIFZZ
3.84 0.690D-01 0.180D+08 3.8728 20 4042.5 4778.6 0.0
WARNING ENERGY OUT OF RANGE,INCREASE ELECTRON ENERGY INTEGRATION RANGE
root@llh-virtual-machine:/home/llh/Garfield/Patent/build#
i meant:
while the electricfield is set as from 50V/cm to 1000V/cm，the error is produced.
but:
while the electricfield is set as from 650V/cm to 850V/cm, everythings work well.
the increments are all 50V/cm.
Sorry for my late reply. That’s strange, the calculation of the energy range for a given electric field should normally be independent of the previously set electric field. Will try if I can reproduce this.
As a pragmatic short-term solution, you could generate separate gas files: one covering the range of electric fields from 50 V/cm to 600 V/cm and one covering the range 650 - 1000 V/cm. And then merge the two gas files (see the section “Merging gas files” on this page).
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