10.68 MBUMPER—A time-dependent multipole kicker magnet. The waveform is in SDDS format,
with time in seconds and amplitude normalized to 1.
A time-dependent multipole kicker magnet. The waveform is in SDDS format, with time in seconds and
amplitude normalized to 1.
Parallel capable? : yes
GPU capable? : no
Back-tracking capable? : no
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| Parameter Name | Units | Type | Default | Description |
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| L | M | double | 0.0 | length |
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| STRENGTH | | double | 0.0 | geometric strength in 1/m order+1) |
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| TILT | RAD | double | 0.0 | rotation about longitudinal
axis |
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| DX | M | double | 0.0 | misalignment |
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| DY | M | double | 0.0 | misalignment |
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| DZ | M | double | 0.0 | misalignment |
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| TIME_OFFSET | S | double | 0.0 | time offset of waveform |
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| ORDER | | long | 0 | multipole order, where 1 is
quadrupole, 2 is sextupole, etc. |
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| PERIODIC | | long | 0 | is waveform periodic? |
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| PHASE_REFERENCE | | long | 0 | phase reference
number (to link with other
time-dependent elements) |
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| FIRE_ON_PASS | | long | 0 | pass number to fire on |
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| N_KICKS | | long | 0 | Number of kicks to use for
simulation. |
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| WAVEFORM | | STRING | NULL | <filename>=<x>+<y>
form specification of input file
giving kick factor vs time |
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| 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 |
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This element simulates a time-dependent multipole kicker magnet. To use this element, you must
supply an SDDS file giving the time-dependent waveform. The element is called MBUMPER to because
HKICK, VKICK, KICKER are used for steering magnets.
The arrival time of the beam is taken to define the reference time, t = 0. Hence, if the waveform file
has the maximum amplitude at t = 0, the beam will get kicked at the peak of the waveform. If the
waveform peaks at t = tpeak, then setting TIME_OFFSET equal to -tpeak will ensure that the beam is kicked
at the peak amplitude.
By default, the kicker fires on the first beam passage. However, if FIRE_ON_PASS is used, then the
kicker is treated like a drift space until the specified pass. Note that teh first pass is 0, not
1.
If PHASE_REFERENCE is non-zero, then the initial timing is taken from the first time-dependent element
that has the same PHASE_REFERENCE value. This would allow, for example, simulating several kickers firing
at the same time. Delays relative to this reference time can then be given with positive adjustments to
TIME_OFFSET.
The input file need not have equispaced points in time. However, the time values should increase
monotonically.
This element simulates a quadrupole or higher order kicker only. For dipole kickers, see the BUMPER
element.
Explanation of <filename>=<x>+<y> format: Several elements in elegant make
use of data from external files to provide input waveforms. The external files are SDDS files,
which may have many columns. In order to provide a convenient way to specify both the
filename and the columns to use, we frequently employ <filename>=<x>+<y> format for the
parameter value. For example, if the parameter value is waveform.sdds=t+A, then it means
that columns t and A will be taken from file waveform.sdds. The first column is always the
independent variable (e.g., time, position, or frequency), while the second column is the dependent
quantity.