Xtrack version 0.40.0

Changes

• Introduce only_markers mode for Line.twiss.
• In Line.twiss finite-difference steps are automatically adapted to estimated beam size.
• New feature in Line.match
  • xtrack.START and xtrack.END can be used as location in match targets.
  • TargetSet can be used to specify multiple parameters at the same location.
  • Default values for vary limits and steps can be specified in Line.vars.vary_default.
  • Line.match always returns the optimizer object.
• Add examples of rematching for LHC optics.

Full Changelog: v0.39.0...v0.40.0

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

Xtrack version 0.38.3

Changes:

• Fix in dipole wedge map (issue with ions)
• Add Tracker._init_io_buffer method.

Full Changelog: v0.38.2...v0.38.3

Xtrack version 0.38.2

Changes:

• Fixes in Fringe fields and expanded bend
• Fix in Line.optimize_for_tracking

Full Changelog: v0.38.1...v0.38.2

Xtrack version 0.38.1

Changes:

• ShiftZeta element shifts only time variable.

Xtrack version 0.38.0

Changes:

• Introduce non-linear fringe effects in DipoleEdge element (can be enabled using Line.configure_bend_model(edge='full'))
• Introduce "compound elements" in Line.
  • Elements within compounds can be grouped in twiss using the option group_compound_elements=True
• Rename Bend.method into Bend. model.

Full Changelog: v0.37.2...v0.38.0

Xtrack version 0.37.2

Changes:

• Prepare support for Bhabha scattering (soon to be deployed in Xfields)
• Fix issue with optimize_for_tracking when element internal records are active

Xtrack version 0.37.0

Changes:

• Introduce the following thick elements: Bend, Quadrupole, CombinedFunctionMagnet.
• Introduce Line.slice_thick_elements method, equivalent to MAD-X makethin.
• Introduce time-dependent functions within xdeps variables, which are changed automatically during tracking.
• Introduce new method Line.check_compatibility_with_prebuilt_kernels

Full Changelog: v0.36.5...v0.37.0

Xsuite version 0.36.5

Changes:

• Docstrings update

Xtrack version 0.36.4

Changes:

• More accurate calculation of dispersion and crab dispersion
• In twiss method="4d" freezes the energy variables (but not zeta).
• Fixes in management of cached and pre-built kernels and some reorganization in Tracker.
• Fixes in twiss orientation management.
• Fix in Line.optimize_for_tracking.
• Remove to_binary/from_binary methods in Tracker.

Full Changelog: v0.36.2...v0.36.4