10.55 MALIGN—A misalignment of the beam, implemented as a zero-order matrix.

A misalignment of the beam, implemented as a zero-order matrix.
Parallel capable? : yes
GPU capable? : yes
Back-tracking capable? : yes






Parameter Name UnitsType Default

Description






DXP double0.0

delta x’






DYP double0.0

delta y’






DX M double0.0

delta x






DY M double0.0

delta y






DZ M double0.0

delta z






DT S double0.0

delta t






DP double0.0

delta p/pCentral






DE double0.0

delta gamma/gammaCentral






ON_PASS long -1

pass on which to apply






FORCE_MODIFY_MATRIX long 0

modify the matrix even if on_pass>=0






START_PID long -1

starting particleID for particles to affect. By default, all particles are affected.






END_PID long -1

ending particleID for particles to affect. By default, all particles are affected.






FLOOR long 0

if non-zero, floor coordinates are changed, which is probably a bad idea






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






The default value of the PASS parameter (-1) means that the misalignment is imposed on the beam every pass. This is appropriate for static misalignments. When using the MALIGN element to kick the beam for beam dynamics studies in rings, PASS>=0 is required. If PASS=0, closed orbit computation and correction will include the effect of the kick; however, matrix-based computations by default will not (set FORCE_MODIFY_MATRIX=1 to change this). If PASS>0, then closed orbit computation and correction do not include the kick, which is probably what is desired in beam dynamics studies in rings.

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