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Zlsc(k ) = πkr2 1 - γ K1 γ
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A combination of RFCA, WAKE, TRWAKE, and LSCDRIFT.
Parallel capable? : yes
GPU capable? : yes
Back-tracking capable? : yes
| Parameter Name | Units | Type | Default | Description |
| L | M | double | 0.0 | length |
| CELL_LENGTH | M | double | 0.0 | cell length (used to scale wakes, which are assumed to be given for a cell, according to L/CELL_LENGTH) |
| VOLT | V | double | 0.0 | voltage |
| PHASE | DEG | double | 0.0 | phase |
| FREQ | Hz | double | 500000000 | frequency |
| Q | double | 0.0 | cavity Q (for cavity that charges up to voltage from 0) |
|
| PHASE_REFERENCE | long | 0 | phase reference number (to link with other time-dependent elements) |
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| CHANGE_P0 | long | 0 | does element change central momentum? |
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| CHANGE_T | long | 0 | see RFCA documentation |
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| FIDUCIAL | STRING | NULL | mode for determining fiducial arrival time (light, tmean, first, pmaximum) |
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| END1_FOCUS | short | 0 | include focusing at entrance? |
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| END2_FOCUS | short | 0 | include focusing at exit? |
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| STANDING_WAVE | short | 0 | Use standing-wave cavity model instead of default traveling wave? |
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| BODY_FOCUS_MODEL | STRING | NULL | None (default) or SRS (simplified Rosenzweig/Serafini for standing wave) |
|
| N_KICKS | long | 0 | Number of kicks to use for kick method. Set to zero for matrix method. |
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| ZWAKE | long | 1 | If zero, longitudinal wake is turned off. |
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| TRWAKE | long | 1 | If zero, transverse wakes are turned off. |
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| WAKEFILE | STRING | NULL | name of file containing Green functions |
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RFCW continued
A combination of RFCA, WAKE, TRWAKE, and LSCDRIFT.
| Parameter Name | Units | Type | Default | Description |
| ZWAKEFILE | STRING | NULL | if WAKEFILE=NULL, optional name of file containing longitudinal Green function |
|
| TRWAKEFILE | STRING | NULL | if WAKEFILE=NULL, optional name of file containing transverse Green functions |
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| TCOLUMN | STRING | NULL | column containing time data |
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| WXCOLUMN | STRING | NULL | column containing x Green function |
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| WYCOLUMN | STRING | NULL | column containing y Green function |
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| WZCOLUMN | STRING | NULL | column containing longitudinal Green function |
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| N_BINS | long | 0 | number of bins for current histogram |
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| INTERPOLATE | long | 0 | interpolate wake? |
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| 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 |
|
| SG_ORDER | long | 1 | Savitzky-Golay filter order for smoothing |
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| DX | M | double | 0.0 | misalignment |
| DY | M | double | 0.0 | misalignment |
| T_REFERENCE | S | double | -1 | arrival time of reference particle |
| LINEARIZE | long | 0 | Linearize phase dependence? |
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| LSC | long | 0 | Include longitudinal space-charge impedance? |
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| LSC_BINS | long | 1024 | Number of bins for LSC calculations |
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| LSC_INTERPOLATE | long | 1 | Interpolate computed LSC wake? |
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| LSC_LOW_FREQUENCY_CUTOFF0 | double | -1 | Highest spatial frequency at which low-frequency cutoff filter is zero. If not positive, no low-frequency cutoff filter is applied. Frequency is in units of Nyquist (0.5/binsize). |
|
RFCW continued
A combination of RFCA, WAKE, TRWAKE, and LSCDRIFT.
| Parameter Name | Units | Type | Default | Description |
| LSC_LOW_FREQUENCY_CUTOFF1 | double | -1 | Lowest spatial frequency at which low-frequency cutoff filter is 1. If not given, defaults to LOW_FREQUENCY_CUTOFF1. |
|
| LSC_HIGH_FREQUENCY_CUTOFF0 | double | -1 | Spatial frequency at which smoothing filter begins for LSC. If not positive, no frequency filter smoothing is done. Frequency is in units of Nyquist (0.5/binsize). |
|
| LSC_HIGH_FREQUENCY_CUTOFF1 | double | -1 | Spatial frequency at which smoothing filter is 0 for LSC. If not given, defaults to HIGH_FREQUENCY_CUTOFF0. |
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| LSC_RADIUS_FACTOR | double | 1.7 | LSC radius is (Sx+Sy)/2*RADIUS_FACTOR |
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| WAKES_AT_END | long | 0 | Do wake kicks at end of segment (for backward compatibility)? |
|
| 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 is a combination of the RFCA, WAKE, and TRWAKE elements. As such, it provides combined simulation of an rf cavity with longitudinal and transverse wakes, as well as longitudinal space charge.
For the wakes, the input files and their interpretation are identical to WAKE and TRWAKE, except that the transverse and longitudinal wakes are interpreted as the wakes for a single cell of length given by the CELL_LENGTH parameter.
Users should read the entries for WAKE, TRWAKE, and RFCA for more details on this element.
This element simulates longitudinal space charge using the method described in [22]. This is based on the longitudinal space charge impedance per unit length
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| (130) |
N.B.: Do not use CHANGE_T=1 if you have rf cavities that are not at harmonics of one another or if you have other time-dependent elements that are not resonant. Also, if you have harmonic cavities, only use CHANGE˙T on the cavity with the lowest frequency. Failure to follow these rules can result in wrong results and crashes.
RFDF