Combining SOURCE and BEAMSPOT

Source Definition
1

Is it possible to combine the SOURCE and SPECSOUR using BEAMSPOTs?

I have multiple photon beams I would like to implement with the SPOTBEAM cards but I would like to define these photon beam energies from a spectrum.

2

Dear Dirk,

if all the beam spots use the same spectrum, then you could use the phase-space sampling option of the source_newgen user routine, to sample from the different starting points.

You only need to give dummy energy/momentum values if the file, and when assigning the value of the momentum_energy variable you just use the histogram sampling function instead of the value from the phase_space_entry.

If you want an extended spot size (not a point source), then you need to program the sampling and rotation for it, but that should not be difficult.

Cheers,
David

3

Ok. Yes, I think see how I could do it all in the source_newgen user routine.

You are saying to generate a phase space of starting positions from my use of SPOTBEAMs and then use that phase space in to sample from in the source_newgen routine while replacing the phase space particle the energy sampled from my spectrum. Correct?

This implies I cannot enable the SOURCE and SPECSOUR cards simultaneously, correct?

4

Dear Dirk,

yes, that is the idea.

And no, the SOURCE and SPECSOUR cards can’t be used at the same time.

Cheers,
David

5

Thank you for the quick response.