A corrugated round pipe, commonly used as a dechirper in linacs.
Parallel capable? : yes
GPU capable? : no
Back-tracking capable? : no
| Parameter Name | Units | Type | Default | Description |
| L | M | double | 0.0 | length |
| RADIUS | M | double | 0.0 | pipe radius |
| PERIOD | M | double | 0.0 | period of corrugations (<< radius recommended) |
| GAP | M | double | 0.0 | gap in corrugations (< period required) |
| DEPTH | M | double | 0.0 | depth of corrugations (<< radius, > period recommended) |
| DT | S | double | 0.0 | maximum time duration of wake (0 for autoscale) |
| TMAX | S | double | 0.0 | maximum time duration of wake (0 for autoscale) |
| N_BINS | long | 0 | number of bins for charge histogram (0 for autoscale) |
|
| INTERPOLATE | long | 0 | interpolate wake? |
|
| SMOOTHING | long | 0 | Use Savitzky-Golay filter to smooth current histogram? |
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| SG_HALFWIDTH | long | 4 | Savitzky-Golay filter half-width for smoothing |
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| SG_ORDER | long | 1 | Savitzky-Golay filter order for smoothing |
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| CHANGE_P0 | long | 0 | change central momentum? |
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| ALLOW_LONG_BEAM | long | 0 | allow beam longer than wake data? |
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| RAMP_PASSES | long | 0 | Number of passes over which to linearly ramp up the wake to full strength. |
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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 implements the longitudinal wake for a corrugated pipe using a model by K. Bane [38]. The method used is identical to that for the WAKE element. The only difference is that instead of providing a file to specify the wake, one specifies the parameters of Bane’s model, as described above.
Setting the N_BINS and TMAX paramaters to 0 is recommended. This results in auto-scaling of the number of bins and the time spacing of the wake to ensure sufficient length to cover the beam and a sufficiently fine time step to resolve the oscillations in the wake.
As with WAKE, the default degree of smoothing (SG_HALFWIDTH=4) may be excessive. It is suggested that users vary this parameter to verify that results are reliable if smoothing is employed (SMOOTHING=1).
CORGPLATES