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@inproceedings{hock:ipac2021-mopab180,
author = {K. Hock and H. Huang and F. Méot and N. Tsoupas},
title = {{AGS Dynamic Aperture at Injection of Polarized Protons and Helions}},
booktitle = {Proc. IPAC'21},
pages = {610--612},
eid = {MOPAB180},
language = {english},
keywords = {dynamic-aperture, coupling, proton, injection, extraction},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-MOPAB180},
url = {https://jacow.org/ipac2021/papers/mopab180.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB180},
abstract = {{Polarized helions are part of the physics program for the future EIC. An AC dipole has been installed in the AGS Booster to preserve polarization as helions are accelerated to |Ggamma|=10.5. Extraction from the AGS Booster at |Ggamma|=7.5 is possible but: would involve crossing an intrinsic resonance in the AGS, and would be the lowest rigidity beam injected into the AGS, and therefore experiences strong distortions of the optical functions because of the AGS two partial snakes. This lower rigidity would exacerbate the optical distortions from the snake, reducing the dynamic aperture. A comparison of the dynamic aperture of protons at Ggamma=4.5 to that of helions at |Ggamma|=7.5 and |Ggamma|=10.5 show that extraction at |Ggamma|=10.5 provides a larger dynamic aperture. This larger aperture would allow helions to be placed inside the spin tune gap generated by the two partial helices in AGS earlier in the cycle.}},
}