A few rules to crosscheck the direction of the forces on the particles

If you have a few doubts on the action of a magnet on a particle which is running clockwise (beam1) or counter-clockwise (beam2), please find below a few rules to crosscheck your simulation programme with a 7 TeV proton test particle:

Main dipoles

They define the reference orbit for beam1 and beam2 as in the picture below. Details on the reference orbit in the experimental IRs can be found here.

Quadrupoles

The action of a quadrupole on the beam can be easily checked looking at the value of the beta functions before and after the quadrupole or better looking at the slope of the beta function (alpha). In general the twin apertures quadrupoles behave like the single aperture quadrupoles and therefore have a different action on the two beams.

Orbit correctors

The action of the orbit correctors (HKICK and VKICK and the MAD table) can be easily checked plotting X and Y as function of s.