next up previous
Next: HISTOGRAM Up: Element Dictionary Previous: ENERGY

FMULT

Multipole kick element with coefficient input from an SDDS file.
Parameter Name Units Type Default Description
L $M$ double 0.0 length
TILT $RAD$ double 0.0 rotation about longitudinal axis
DX $M$ double 0.0 misalignment
DY $M$ double 0.0 misalignment
DZ $M$ double 0.0 misalignment
FSE   double 0.0 fractional strength error
N_KICKS   long 1 number of kicks
SYNCH_RAD   long 0 include classical synchrotron radiation?
FILENAME   STRING NULL name of file containing multipole data





This element simulates a multipole element using a 4th-order sympletic integration. Specification of the multipole strength is through an SDDS file. The file is expected to contain a single page of data with the following elements:
  1. An integer column named order giving the order of the multipole. The order is defined as $(N_{poles}-2)/2$, so a quadrupole has order 1, a sextupole has order 2, and so on.
  2. A floating point column named KnL giving the integrated strength of the multipole, $K_n L$, where $n$ is the order. The units are $1/m^(n-1)$.
To specify skew multipoles, you must use a separate FMULT element and set the TILT parameter. This is not very convenient and should be changed in the future. The MULT element is also available, which allows the same functionality without an external file.
next up previous
Next: HISTOGRAM Up: Element Dictionary Previous: ENERGY
Robert Soliday 2002-09-24