|Message: Kinetic energy of electrons in a gas at their creation -- density dependency?!?||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)|
I have protons of 90 MeV passing in a gas composed of CO2, CO, N2 and H2.
For now I shoot protons of 90 MeV along the z direction. I want to know the initial kinetic energy with which the elctrons are generated.
For this, when I "register" the event in EventAction, I ask that every step of the event is saved. In particular, I ask to save:
evtNo = evt -> GetEventID();
stepNb = step->GetTrack()->GetCurrentStepNumber();
KinEn = step -> GetPreStepPoint() -> GetKineticEnergy()/eV;
particleName = (aStep -> GetTrack() -> GetDynamicParticle()-> GetDefinition() -> GetParticleName());
When I process the results, I make a histogram of the KinEn and fill it only if the particleName is "e-" and the "stepNb" is 1 (so that I am sure I am looking at the PreStep kinetic energy of the electron at its first step, which I think should be the kinetic energy it has when it is generated).
I obtain a histogram, for a certain density (density = 1 g/cm3) as reported on the attachment called *1g.pdf.
If then I change the gas density, the histogram completely changes (ex. for a gas density of 0.05g/cm3, the result is reported in the attached image called *005g.pdf).
But I think that the energy with which an electron is emitted depends on the incident particle energy and on the gas composition, not on its density.
Am I looking at the wrong quantity, pls? How can I get the initial kinetic energy with which the electrons are created, pls?
Thanks, regards, franciuska
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/09/27/08.00-86289-1g.pdf http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/09/27/08.00-60065-005g.pdf
|Inline Depth:||Outline Depth:||Add message:|