Tune shift with amplitude of the system. When the tune reaches resonant values, it can be unstable, and thus a tune-shift with amplitude can limit the stability region, or dynamic aperture. In classical mechanics, a simple example of a system with tune shift with amplitude is a pendulum. In accelerator physics, both the transverse and the longitudinal dynamics show tune shift with amplitude. A simple model of the transverse dynamics is of an oscillator with a single sextupole, it is referred to as the Hénon map. Another model for this case is the Standard Map. An important example is the typical case of distributed
Something More Than Free Something More Than Free Something More Than Free is the fifth studio album by Jason Isbell. It was produced by Dave Cobb, who also produced Isbell's last record, "Southeastern". The album received the Grammy Award for Best Americana Album at the 58th Annual Grammy Awards. "Something More Than Free" received mostly positive reviews. On Metacritic, the album has a score of 87 out of 100 based on 25 reviews, indicating "universal acclaim." "The A.V. Club"s Eric Swedlund praised the album, writing "though "Something More Than Free" may not repeat Isbell’s album-of-the-year accolades, it continues the magic of that breakthrough LP."