Default particle

[lfarv]

The default particle is set back to 'relativistic', meaning "relativistic electron", and its definition is modified as follows:

• its rest energy is zero,
• its charge is -1,
• its relativistic β is 1,
• its relativistic γ, as reported by the Lattice.gamma property is the one of an electron.

This is physically inconsistent (see discussion here), but it describes the historical behaviour of AT.
It allows to generalise the use of the lattice properties Lattice.gamma and Lattice.beta everywhere, while being consistent with tracking.

In addition, the energy and particle properties are made available to the C integrators, in preparation for non-relativistic tracking. The "global" parameters transmitted to the C integrators are now:

• ring length,
• ring revolution time,
• turn number,
• energy,
• particle rest energy,
• particle charge,
• s coordinate

The new parameters must not be used until the equivalent is made for Matlab!

[swhite2401]

Ok for me