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10.31 FMULT—Multipole kick element with coefficient input from an SDDS file.

Multipole kick element with coefficient input from an SDDS file.
Parallel capable? : yes
GPU capable? : no
Back-tracking capable? : no

Parameter NameUnitsType Default

Description

L M double 0.0

length

TILT RADdouble 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 short 0

include classical, single-particle synchrotron radiation?

FILENAME STRINGNULL

name of file containing multipole data

SQRT_ORDER short 0

Ignored, kept for backward compatibility only.

GROUP string NULL

Optionally used to assign an element to a group, with a user-defined name. Group names will appear in the parameter output file in the column ElementGroup

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 (Npoles - 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, KnL, where n is the order. The units are 1∕mn .
  3. A floating point column named JnL giving the integrated strength of the skew multipole, JnL, where n is the order. The units are 1∕mn.

The MULT element is also available, which allows the same functionality without an external file, for a single component.

The transport matrix for FMULT elements is determined by tracking and will affect the tunes, chromaticities, etc.

FRFMODE

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