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* OPAL-T: The design energy of dipoles is now expected in MeV instead of eV
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* The meaning of `OFFSETZ` of the command `DISTRIBUTION` has changed. It now indicates a shift of the particle bunch relative to the reference particle. Use the `ZSTART` attribute of the `TRACK` command to start the simulation at a position `z > 0`
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* The attribute `DISTRIBUTION` of the command `DISTRIBUTION` has been renamed to `TYPE`
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* The attributes `LAT_RINIT` and `BEAM_RINIT` of the element `RINGDEFINITION` have units [m] instead of [mm].
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* OPAL-T: The attribute `ROTATION` of `RBEND` and `SBEND` has been replaced by `PSI` which now can be applied to all elements to rotate them about the reference trajectory
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* OPAL-Cycl: The trim coil description has been changed and trim coils are now a separate element.
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A new recommended description based on a rational function has been added.
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The old description has changed its units for `BMAX` from [kG] to [T] and `SLPTC` has been inverted to [1/mm].
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* The attributes `LAT_RINIT` and `BEAM_RINIT` of the element `RINGDEFINITION` have units [m] instead of [mm].
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* OPAL-Cycl: `DUMPFIELDS` and `DUMPEMFIELDS` commands now uses metres and radians as input instead of mm and degrees.
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## Output file related changes
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## Input file related changes introduced in [OPAL-1.6](OPAL-1.6)
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* The attribute `BFREQ` of the `BEAM` command is now in MHz instead of Hz
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* Input files must have a version tag, for example
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* Input files must have a version tag, for example
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```
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OPTION, VERSION=20000;
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```
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