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Keywords: setmomentumdirection
Forum: Event and Track Management
Re: None setmomentumdirection
Date: 23 Nov, 2005
From: michel maire <michel maire>

User wrote:

>> Dear Madam/Sir
>> 
>> I ask to you for confirmation on my understanding on
>> SetParticleMomentumDirection. I want to include the momentum from the
>> emittance of the beam. I guess the three components of the vector are:
>> cos(alpha1)=thetax= Px/P, cos(alpha2)=thetay=Py/P, cos(alpha3)=Pz/P with
>> P the total momentum and z the direction for beam propagation. If I put
>> then, cos(alpha1), cos(alpha2) and cos(alpha3) to define the direction
>> of the particle momentum, GEANT4 will automatically yield the momentum
>> from this unitary vector in combination with the energy given by
>> SetParticleEnergy.
>> 
>> am I correct ? Thankyou very much regards Daniel

 Yes, it is correct.
 Futhermore the vector direction does not need to be normalized: geant4
 will do.

 The z direction is not necessary the direction on the beam. This is your 
 choice. The reference frame is the one of the World volume.

     Michel
 

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