LEFFECTIVE in KQUAD element
Posted: 17 Aug 2018, 06:59
I am confused about how the LEFFECTIVE parameter works in the KQUAD element.
According to the manual:
According to the manual:
I would have thought that elegant makes a quadrupole with length LEFFECTIVE and then adds drift spaces on either side to make up the total length L. I would therefore expect that when LEFFECTIVE = L, this is the equivalent of having LEFFECTIVE = 0, i.e. deactivated. However, it seems this is not the case. How exactly does it work?As of version 29.2, this element incorporates the ability to have different values for the insertion
and effective lengths. This is invoked when LEFFECTIVE is positive. In this case, the L parameter is
understood to be the physical insertion length. Using LEFFECTIVE is a convenient way to incorporate
the fact that the effective length may differ from the physical length and even vary with excitation,
without having to modify the drift spaces on either side of the quadrupole element.