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Title: Re-visiting RHIC snakes

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Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
Report Number(s):
R&D Project: KBCH139; 18031; KB0202011
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 8th International Particle Accelerator Conference (IPAC17); Bella Center, Copenhagen, Denmark; 20170514 through 20170519
Country of Publication:
United States

Citation Formats

Meot F., Gupta, R., Huang, H., Marusic, A., Ranjbar, V., and Robert-Demolaize, G.. Re-visiting RHIC snakes. United States: N. p., 2017. Web.
Meot F., Gupta, R., Huang, H., Marusic, A., Ranjbar, V., & Robert-Demolaize, G.. Re-visiting RHIC snakes. United States.
Meot F., Gupta, R., Huang, H., Marusic, A., Ranjbar, V., and Robert-Demolaize, G.. 2017. "Re-visiting RHIC snakes". United States. doi:.
title = {Re-visiting RHIC snakes},
author = {Meot F. and Gupta, R. and Huang, H. and Marusic, A. and Ranjbar, V. and Robert-Demolaize, G.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 5

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  • In this Tech. Note RHIC snakes and stable spin directionmore » $$\vector{n}$$ 0(s) are re-visited, based on OPERA-computed field maps of the former. The numerical simulations so undertaken provide various outcomes regarding RHIC optics and spin dynamics, in relation with orbital and focusing effects resulting from the use of this realistic 3-D representation of the snakes.« less
  • We discuss the generalized snake configurations, which offers either the advantages of shorter total snake length and smaller horizontal orbit displacement in the compact configuration or the dual functions of a snake and a 90{degree} spin rotation for the helicity state. The generalized snake is then applied to the polarized proton collision in RHIC. The possible schemes of obtaining high luminosity are discussed.
  • Spin rotators and Siberian snakes for RHIC can be built using 4 helical magnets obtained, by twisting, from the cosine dipoles. The authors found that the fringe fields are important. In the calculations they have used a plausible model for the fringe. However, only magnetic measurements on the prototypes presently being built will allow a final optimization. The linear coupling at injection, {Delta}Q{sub min} < 10{sup {minus}2}, is well within the range of the RHIC decoupling system. At storage, the coupling introduced by the devices ({Delta}Q{sub min} < 10{sup {minus}4}) is negligible.
  • The RHIC collider, now under construction at BNL, will have the possibility of polarized proton-proton collisions up to a beam energy of 250 Gev. Polarized proton beams of such high energy can be only obtained with the use of siberian snakes, a special kind of spin rotator that rotates the particle spin by 180{degree} around an axis lying in the horizontal plane. Siberian snakes help to preserve the beam polarization while numerous spin depolarizing resonances are crossed, during acceleration. In order to collide longitudinally polarized beams, it is also planned to install spin rotators around two interaction regions. This papermore » discusses snake and spin rotator designs based on sequences of four helical magnets. The schemes that were chosen to be applied at RHIC are presented.« less
  • The structure of the four Siberian Snakes and eight Spin Rotators being designed for RHIC is discussed. These devices consist each of four helical dipoles. Results of orbit and spin tracking through the magnets are presented. 14 refs., 8 figs., 4 tabs.