Re: Problem with Cerenkov process ?

 Hi Denis,

 I think that your problem has been already fixed  in the CVS version of geant4_vmc.
 I have made several corrections when implementing  the new VMC functions for setting optical properties  and the new E06 example which purpose is to test  Cherenkov and optical physics.
 (Your test pDGCode == 50000050 is used for counting Cherenkov   photons in the example and work ok here.)

 This development was not yet included in the geant4_vmc  version 1.6; could you test with the development version  and let me know? Or, you can wait a little bit more,  to version 1.7 that should be available as soon as I get  to test it with the last versions of Root and Geant4.

 Best regards,

 Ivana

-- 
==============================================================
e-mail:  Ivana.Hrivnacova_at_cern.ch
address: Institut Physique Nucleaire, 91406 Orsay, France
phone:   (33) 01 69 15 65 94
==============================================================


On Fri, 24 Jun 2005, Denis Bertini wrote:



> Hello ,

> 

> I have just updated my libraries  to geant4.7.0 patch01 and geant4_vmc1.6.

> I have a application that works with Geant3 either native geometry or with

> TGeo.

> When i switch  to geant4 , the cerenkov particle are not generated.

>  I set Optical Material Properties using the method from TVirtualMC:

> 

>                            gMC->SetCerenkov(Mid, NK, ppckov,absco, effic,

> rindex);

> 

>  I controlled  that those values are correctly transfered to the G4 definition

> when

>  converting TGeo classes to G4 ones.

>  I used the standard  VMC  physics list definition,

>   and  in my g4config.in macro the following definition for processes :

>  /mcPhysics/setEM  true

> /mcPhysics/setMuon true

> /mcPhysics/setHadron true

> /mcPhysics/setOptical true

> /mcPhysics/rangeCut 1.

> 

>  if i test with the (pDGCode ==  50000050) i found that no Cerenkov photons

> are generated.

>    Any  hints ?

>                                                        regards,

>                                                                  Denis Bertini