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Dynamic aperture (accelerator physics) : ウィキペディア英語版 | Dynamic aperture (accelerator physics)
The dynamic aperture is the stability region of phase space in a circular accelerator. ==Dynamic aperture for hadrons== In the case of protons or heavy ion accelerators, (or synchrotrons, or storage rings), there is minimal radiation, and hence the dynamics is symplectic. For long term stability, tiny dynamical diffusion (or Arnold diffusion) can lead an initially stable orbit slowly into an unstable region. This makes the dynamic aperture problem particularly challenging. One may be considering stability over billions of turns. A scaling law for Dynamic aperture vs. number of turns has been proposed by Giovannozzi.
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