|Message: Re: non-uniform electric field in chamber||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
Hello, I suggest to you to check extended example field 02 to see how to set up the field module for an electric field. You can find this in your Geant4 distribution at the directory examples/extended/field/field02/ and in LXR at http://www-geant4.kek.jp/lxr/source/examples/extended/field/field02/ The simplest way would be to copy the class F02ElectricFieldSetup and modify it for your needs. You will need also the field messenger, if you do not comment it out. http://www-geant4.kek.jp/lxr/source/examples/extended/field/field02/src/F02ElectricFieldSetup.cc The line you will certainly need to change is the one that creates the field. 67 fEMfield = new G4UniformElectricField( 68 G4ThreeVector(0.0,100000.0*kilovolt/cm,0.0)); Potentially you can pass a pointer to a field that you have created elsewhere to the constructor, if there are many such fields. http://www-geant4.kek.jp/lxr/source/examples/extended/field/field02/src/F02ElectricFieldSetup.cc#L71 Best regards, John Apostolakis, On Mar 12, 2012, at 10:28 AM, Sunring Ling wrote: > > *** Discussion title: Fields: Magnetic and Otherwise > > hello i found out the problem. please change the code > > G4MagIntegratorStepper* myStepperEF3 = new G4ClassicalRK4(myEquationEF3,8); > > to > > G4MagIntegratorStepper* myStepperEF3 = new G4ClassicalRK4(myEquationEF3,5); > > If you check the G4ClassicalRK4 class, you will find the number of > Variables of stepper function is 5. So you can try. > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/emfields/152/1/1/1/1.html