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Dear Jana,
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<div class="">If you are using any physics list with the ending _EMZ, then the electromagnetic processes is instantiated by the G4PhysicsFactory in the following line:</div>
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<div class=""> } else if(4 == em_opt) {</div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>p->ReplacePhysics(new G4EmStandardPhysics_option4(verbose)); </div>
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<div class=""> } … </div>
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<div class="">The capability of GATE to create each process of a physics list via UI command uses different code, so you cannot mix and match between these options.</div>
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<div class="">But after you define the physics list QGSP_BIC_EMZ, it is possible to change the properties of the ionisation process, using the equivalent Geant4 UI command, which I believe is in one of the two directories:</div>
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<div class=""> /process/eLoss</div>
<div class=""> /process/em</div>
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<div class="">You may need to experiment with the order in which you place these UI commands.</div>
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<div class="">Best regards,</div>
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<div class="">John</div>
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<div class="">===================================================</div>
<div class="">John Apostolakis, EP Department, CERN</div>
<div class="">SFT (SoFTware for Experiments) Group</div>
<div class="">Office: Building 32/ room R-003 (ground floor), Mail: J27210</div>
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<div class=""><a href="mailto:john.apostolakis@cern.ch" class="">Email: john.apostolakis@cern.ch</a> Office Tel: +41-22-767-7239</div>
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<div>I note that it is possible also to use C++ code (e.g. revised messengers or elsewhere) to do this also:</div>
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<div class=""> #include “G4EmParameters.hh”</div>
<div class=""> ….</div>
<div class=""> G4EmParametters::SetStepFunction(G4double, G4double)</div>
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<blockquote type="cite" class="">
<div class="">On 12 Dec 2019, at 14:33, Jana Kretschmer <<a href="mailto:jana.kretschmer@uni-oldenburg.de" class="">jana.kretschmer@uni-oldenburg.de</a>> wrote:</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Hi everyone,<span class="Apple-converted-space"> </span><br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">I am facing a problem concerning the physics settings. I would like to use the physics list<span class="Apple-converted-space"> </span><span class="">QGSP_BIC_EMZ but change the step function for electron<span class="Apple-converted-space"> </span><span class="">ionisation<span class="Apple-converted-space"> </span><span class="">(dRoverRange
and finalRange)</span></span>.<span class="Apple-converted-space"> </span><span class="">Is there anyone who has done this before or knows how I can do this in Gate?<span class="Apple-converted-space"> </span></span><br class="">
</span></div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class="">I tried to do this via the commands:<span class="Apple-converted-space"> </span><br class="">
</span></div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class=""><span class="">/gate/physics/addPhysicsList QGSP_BIC_EMZ</span></span></div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class=""><span class="">/gate/physics/processes/ElectronIonisation/setStepFunction e- 0.05 0.1 mm</span></span></div>
<div style="margin-top: 0px; margin-bottom: 0px;" class=""><span class=""><span class=""></span></span><br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Unfortunately this did not work<span class=""></span>, since my simulation output was:<span class="Apple-converted-space"> </span><br class="">
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<p style="margin-top: 0px; margin-bottom: 0px;" class=""></p>
<div class="">eIoni: for e- SubType= 2<br class="">
dE/dx and range tables from 100 eV to 10 TeV in 220 bins<br class="">
Lambda tables from threshold to 10 TeV, 20 bins per decade, spline: 1<br class="">
<span class="Apple-converted-space"> </span><b class="">finalRange(mm)= 0.01, dRoverRange= 0.2</b>, integral: 1, fluct: 1, linLossLimit= 0.01<br class="">
===== EM models for the G4Region DefaultRegionForTheWorld ======<br class="">
PenIoni : Emin= 0 eV Emax= 1 MeV<br class="">
MollerBhabha : Emin= 1 MeV Emax= 10 TeV deltaVI</div>
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<p style="margin-top: 0px; margin-bottom: 0px;" class=""></p>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">I also tried to build my own physics list by adding all processes used in<span class="Apple-converted-space"> </span><span class="">QGSP_BIC_EMZ</span><span class="Apple-converted-space"> </span>and
then setting the step function but I was not able to specify the physics models<span class=""><span class=""><span class="Apple-converted-space"> </span>needed</span></span>.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Best regards,<span class="Apple-converted-space"> </span><br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Jana<br class="">
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