Xtrack version 0.39.0

Changes

• New capabilities related to element compounds:
  • Insertion of elements within compounds.
  • Slicing of thick elements within compounds with propagation to all slices of the aperture and related tilts and shifts.
• New feature in matching with generation of an optimizer object to inspect and drive the matching process (the object can be obtained with optimizer = line.match(solve=False)). The optimizer object allows the following actions:
  • Perform an assigned number of optimization steps calling optimizer.step(...).
  • Iterate until solution is found or termination condition is met through optimized.solve(...).
  • Disable/enable targets and vary objects through their active flag.
  • Inspect vary's and targets of the optimizer using the method optimizer.show().
  • Assign a tag to groups of vary's and targets and disable/enable groups by calling optimizer.disable_targets(tag=...), optimizer.disable_vary(tag=...), optimizer.enable_targets(tag=...), optimizer.enable_vary(tag=...).
  • Inspect the optimizer iteration history through optimizer.log(). History can be deleted by optimizer.clear_log()
  • Reload the state from a given iteration by calling optimizer.reload(...).
  • Provide defaults for vary steps and limits through Line.vars.vary_default.
  • Provide defaults for target tolerances through match(default_tol={...}.
  • Expose all features above in the matching of knobs.
• Introduced Line.vars.load_madx_optics_file method.
• Introduce Line.varval to easily access variable values (line.varval['a'] equivalent to line.vars['a']._value)
• Introduce backtracking for thick elements Quadrupole and Bend (the latter only in expanded mode).
• Introduce Multiline.copy() method.
• Introduce method TwissTable.concatenate to concatenate twiss tables.
• Introduced TargetRelPhaseAdvance to match relative phase advance between two points.
• Fix handling of custom twiss_init when twiss_default['reverse'] is True.

Full Changelog: v0.38.3...v0.39.0