New Oracle upload files for AD_ACCEL (LCLS+LCLS-II) are available. This release has been designated "19DEC2025s". Changes to the previous release:

• replace short-period LCLS-II undulator with long-period LCLS-II-HE undulator in SXR cells 37 and 38
• replace short-period LCLS-II phase shifter with long-period LCLS-II-HE phase shifter in SXR cells 45 and 46

This is a point release update that impacts only the Bmad lattices. The cavity model in use has been updated to a new kick-drift that agrees very well with Rosenzweig & Serifini at at beta=1, but is a better model at beta<1. Also, the new model is much better at reverse propagation and slicing. The new model should, in principle, improve machine-model agreement at lower energy.

With the new model, we can now make use of the new fixer elements. These move the Twiss set point from Beginning to some downstream location. For the Cu lattices, the Twiss set point is now l0bbeg. For the SC lattices, the Twiss set point is now yag01b.

The fixer elements will make it easier to match the model to profile measurements.

New Oracle upload files for AD_ACCEL (LCLS+LCLS-II) are available. This release has been designated "06NOV2025s". Changes to the previous release:

• replace short-period LCLS-II undulator with long-period LCLS-II-HE undulator in SXR cell 36
• replace short-period LCLS-II phase shifter with long-period LCLS-II-HE phase shifter in SXR cells 41, 42, 43, and 44

New Oracle upload files for AD_ACCEL (LCLS+LCLS-II) are available. This release has been designated "22OCT2025s". Changes to the previous release:

• replace short-period LCLS-II undulator with long-period LCLS-II-HE undulator in SXR cells 33 and 34
• replace short-period LCLS-II phase shifter with long-period LCLS-II-HE phase shifter in SXR cells 34, 36, 37, and 40

Point release on 22SEP2025s containing crab_cavity models for tcxdg0 and tcydg0.

New Oracle upload files for AD_ACCEL (LCLS+LCLS-II) are available. This release has been designated "22SEP2025s". Changes to the previous release:

• replace the short-period LCLS-II undulator with a long-period LCLS-II-HE undulator in SXR cell 33
• replace short-period LCLS-II phase shifter with long-period LCLS-II-HE phase shifter in SXR cells 34, 36, and 37

• replace some SXR short-period LCLS-II undulators and phase shifters with long-period (LCLS-II-HE) undulators and phase shifters
• new complement and locations of devices in ESA (DASEL/S30XL/LESA) based on T-474 layout

A new set of AD_ACCEL Lattice Description files has been released. Changes in this release:

• replace short-period LCLS-II undulator and phase shifter in SXR cell 28 with long-period LCLS-II-HE undulator and phase shifter
• move all SXR long-period phase shifters 10.996 mm u/s per X. Permanyer

This release has been designated 09JUN2025s.

Adding Cu cheetah lattice.

First introduction of Cheetah lattice to repo.

What's Changed

• Adding a populated folder for cheetah lattices by @phys-cgarnier in #98

New Contributors

• @phys-cgarnier made their first contribution in #98

Full Changelog: 2025.05.20...2025.05.28