Title | 4-twist helix snake to maintain polarization in multi-GeV proton rings |
Authors | F. Antoulinakis, E. Ljungman, A. Tai, Christine Aidala, E. Courant, Alan Krisch, Wolfgang Lorenzon, P. Myers, R. Raymond, Dennis Sivers, M. Leonova, Yaroslav Derbenev, Vasiliy Morozov, Anatoliy Kondratenko |
JLAB number | JLAB-ACP-13-1722 |
LANL number | arXiv:1309.1063 |
Other number | DOE/OR/23177-2789 |
Document Type(s) | (Journal Article) |
Associated with EIC: | No |
Supported by Jefferson Lab LDRD Funding: | No |
Funding Source: | Nuclear Physics (NP) |
Citation (AIP): |
Antoulinakis, F. et al. Phys.Rev.Accel.Beams 20 (2017) no.9, 091003, Phys.Rev.Accel.Beams. 20 (2017) 091003. |
Publication Abstract: | Solenoid Siberian snakes have successfully maintained polarization in particle rings below 1 GeV, but never in multi-GeV rings, because the spin rotation by a solenoid is inversely proportional to the beam momentum. High energy rings, such as Brookhaven’s 255 GeV Relativistic Heavy Ion Collider (RHIC), use only odd multiples of pairs of transverse B-field Siberian snakes directly opposite each other. When it became impractical to use a pair of Siberian Snakes in Fermilab's 120??GeV/c Main Injector, we searched for a new type of single Siberian snake that could overcome all depolarizing resonances in the 8.9–120??GeV/c range. We found that a snake made of one 4-twist helix and 2 dipoles could maintain the polarization. This snake design could solve the long-standing problem of significant polarization loss during acceleration of polarized protons from a few GeV to tens of GeV, such as in the AGS, before injecting them into multi-hundred GeV rings, such as RHIC. |
Experiment Numbers: | other |
Group: | Ctr for Adv Stud of Accel |
Document: | pdf |
DOI: | https://doi.org/10.1103/PhysRevAccelBeams.20.091003 |
Accepted Manuscript: | PhysRevAccelBeams.20.pdf |
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