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The Use of Helical Dipole Magnets in the RHIC Spin Project

Technical Report ·
DOI:https://doi.org/10.2172/1149823· OSTI ID:1149823
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [3];  [1];  [3];  [1];  [1];  [1]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
  3. Russian Academy of Sciences (RAS), Novosibirsk (Russian Federation). Budker Inst. of Nuclear Physics (BINP)
+ Show Author Affiliations
Superconducting helical dipole magnets will be used in RHIC to maintain polarization and to perform localized spin rotations at the two major experimental detector regions. Requirements for the helical dipole system are discussed, and the status of magnet prototypes is reported. The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory allows for the unique possibility of colliding high energy polarized proton beams. To maintain polarization during the acceleration process, two full “Siberian Snakes” are to be inserted on opposite sides of the RHIC lattice for each of the two counter-rotating rings. In addition, other magnetic components - spin rotators - will be located on each side of the two major interaction points (again, for each ring) which allow the spin orientation to be altered from the vertical direction to the longitudinal direction. Superconducting magnets are used in order to contain the magnetic elements for a Snake within a 10 m longitudinal space so as to fit within available room in the RHIC lattice. The use of helical dipole fields to produce spin rotations in RHIC was first suggested by Ptitsin and Shatunov. Four right-handed helical dipole magnets, each 2.4 m long and operating near 4 T or less can produce a Siberian Snake. The strong helical fields also reduce the orbit excursions produced by these devices. Furthermore, a combination of right-handed and left-handed helical dipole magnets also within a 10 m space can perform the desired local 90° rotations of the spin at the major detector regions.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
AC02-98CH10886
OSTI ID:
1149823
Report Number(s):
BNL--103666-2014-IR
Country of Publication:
United States
Language:
English

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