The OPAL Discussion Forum

[wangchuan02513 <wangchuan02513 AT 163.com>]

Hi, Andreas,
The tot_sey stands for the sum of sey value per time step. Whenever a particle hit the surface, our secondary emission model will calculate the sey value according to both the impact energy and the sey curve of the surface material, then secondary model will use monte carlo process to determine the exact number of secondaries emitted by one impacting issue. If we sum those sey value in each time step for all the particles which hit the surface during this time step, we get the tot_sey value. So this sey_tot value does not exactly count the particles that generated by secondary process but they are related.

For the case we multiply the charge with the sey value, instead of emitting multiple secondaries with the same charge, like the case I sent you, this tot_sey value has less meaning because each particle may have different charge. 

The last column of the PartStatistics.dat is the effective number of particles in simulation domain, i.e, the tot charge divided by the initial charge of one initial particle.

Best regards
Chuan

At 2011-08-26 16:32:55,"Andreas Adelmann" <andreas.adelmann AT psi.ch> wrote:
>Have a question about the PartStatistics.dat file:
>
>1) Does the tot_sey column count the particles that have being  created due to an
>secondary emission process i.e. an electron hit the wall and one or more where created?
> 
>
>
>Thanks Andreas 
>
>
>
> 
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