Re: Constructing a gas material with temp/press in a pure VGM construction.

  Hi again,

  The new minor version (2.08.03) is now available;   at meantime these characteristics have been added also   to Root materials.

  Best regards,

  Ivana

Ivana Hrivnacova wrote:
>
> Hi Brett,
>
> Currently it is not possible, as the definition of interfaces
> was driven by the requirements for converting between Geant4 and Root
> geometry models, and as Root materials do not have temperature and
> pressure, you do not pass these data between them
>
> It can be quickly added; I will prepare a new minor version where
> this will be possible.
>
> Best regards,
>
> Ivana
>
>
> Brett Viren wrote:

>> Hi,
>>
>> Is it possible in a pure VGM construction to define a gas material
>> with a temperature and pressure?  For example, I have the following
>> Geant4 "Vacuum" material that I want to construct given a
>> VGM::IMaterialFactory:
>>
>>
>>   // Air
>>   density = 1.205e-3*g/cm3;
>>   Air = new G4Material(name="Air", density, nel=4);
>>   Air->AddElement(elN, 0.7550);
>>   Air->AddElement(elO, 0.2321);
>>   Air->AddElement(elAr, 0.0128);
>>   Air->AddElement(elC, 0.0001);
>>
>>   // Vacuum
>>   // --- PMT vacuum is very dilute air -------
>>   density     =  1e-3 * kGasThreshold;         //from PhysicalConstants.h
>>   G4double temperature = STP_Temperature;         //from 
>> PhysicalConstants.h
>>   G4double pressure    = STP_Pressure * density / (1.29e-3*g/cm3);
>>   Vacuum = new G4Material(name="Vacuum", density, 1, 
>> kStateGas,temperature,pressure);
>>   Vacuum->AddMaterial(Air, 1.);
>>
>>
>> I know how to convert "Air", but not "Vacuum".
>>
>> Thanks for any help,
>> -Brett.
>>

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