Custom Query (21 matches)

I would like to study the background coming from other sources than pairs production in the ILC, especially the beamstrahlung photons and the outcoming beams, to see if their interaction with elements along the beam can create secondaries hitting the vertex detector.

I have produced the corresponding output files with GuineaPig, but their format is different from the one of pairs.dat and I am puzzled.

On the GuineaPig manual at ​http://flc.web.lal.in2p3.fr/mdi/BBSIM/guineaPigHtml/userman_3.html I read: Beam output files:

1. The energy of the Mparticle in GeV
2. x position at the intersection plane in micron
3. y position at the intersection plane in micron
4. z position within the bunch in micron
5. the angle in x, x', in microradian
6. the angle in y, y', in microradian.

I guess that the intersection plane is such that z=0, thus I can assume as vertex for the event x y 0, but I do not know what to do with the angles in x, x' and y, y'.

A similar format is in case of the beamstrahlung photon output file.

I would be grateful for any suggestion you may have, I feel quite lost...

Could you, please, also confirm me that the unity of the vertex position in pairs.dat are nanometers? And why the z-position of the vertex is ~ +-1, which correspond to ~ 3 times the length of the bunch?

Thank you,

rita

La couleur avait été choisie en fonction de celle du logo; celui-ci est maintenant monocolor et ne contraint plus le choix …

Je propose de demander à Cecilia d'agir.

It could be nice to see which results were obtained for the grid cuts with the automatic grid size computaion in the main output file.