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Title: The AGS synchrotron with four helical magnets

Abstract

The idea of using two partial helical magnets was applied successfully to the AGS synchrotron to preserve the proton beam polarization. In this paper we explore in details the idea of using four helical magnets placed symmetrically in the AGS ring. The placement of four helical magnets in the AGS ring provides many advantages over the present setup of the AGS which uses two partial helical magnets. First, the symmetric placement of the four helical magnets allows for a better control of the AGS optics with reduced values of the beta functions especially near beam injection, second, the vertical spin direction during beam injection and extraction is closer to vertical, and third, it provides for a larger 'spin tune gap', which allows the vertical and horizontal tunes to be placed, and prevent the horizontal and vertical intrinsic spin resonances of the AGS to occur during the acceleration cycle. Although the same spin gap can be obtained with a single or two partial helices, the required high field strength of a single helix makes its use impractical, and that of the double helix rather difficult. In this paper we will provide results on the spin tune and on the optics ofmore » the AGS with four partial helical magnets, and compare these results with the present setup of the AGS that uses two partial helical magnets.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Alternating Gradient Synchrotron
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1047674
Report Number(s):
BNL-96856-2012-CP
R&D Project: KBCH139; 18031; KB0202011; TRN: US1204022
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 2012 International Particle Accelerator Conference (IPAC 2012); New Orleans, LA; 20120520 through 20120525
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; ACCELERATORS; BEAM INJECTION; MAGNETS; OPTICS; POLARIZATION; PROTON BEAMS; SPIN; SYNCHROTRONS; alternating gradient synchrotron

Citation Formats

Tsoupas N., Huang, H., Roser, T., MacKay, W.W., and Trbojevic, D. The AGS synchrotron with four helical magnets. United States: N. p., 2012. Web.
Tsoupas N., Huang, H., Roser, T., MacKay, W.W., & Trbojevic, D. The AGS synchrotron with four helical magnets. United States.
Tsoupas N., Huang, H., Roser, T., MacKay, W.W., and Trbojevic, D. 2012. "The AGS synchrotron with four helical magnets". United States. doi:. https://www.osti.gov/servlets/purl/1047674.
@article{osti_1047674,
title = {The AGS synchrotron with four helical magnets},
author = {Tsoupas N. and Huang, H. and Roser, T. and MacKay, W.W. and Trbojevic, D.},
abstractNote = {The idea of using two partial helical magnets was applied successfully to the AGS synchrotron to preserve the proton beam polarization. In this paper we explore in details the idea of using four helical magnets placed symmetrically in the AGS ring. The placement of four helical magnets in the AGS ring provides many advantages over the present setup of the AGS which uses two partial helical magnets. First, the symmetric placement of the four helical magnets allows for a better control of the AGS optics with reduced values of the beta functions especially near beam injection, second, the vertical spin direction during beam injection and extraction is closer to vertical, and third, it provides for a larger 'spin tune gap', which allows the vertical and horizontal tunes to be placed, and prevent the horizontal and vertical intrinsic spin resonances of the AGS to occur during the acceleration cycle. Although the same spin gap can be obtained with a single or two partial helices, the required high field strength of a single helix makes its use impractical, and that of the double helix rather difficult. In this paper we will provide results on the spin tune and on the optics of the AGS with four partial helical magnets, and compare these results with the present setup of the AGS that uses two partial helical magnets.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2012,
month = 5
}

Conference:
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  • The idea of using multiple partial helical magnets was applied successfully to the AGS synchrotron, to preserve the proton beam polarization. In this paper we explore in details the idea of using four helical magnets placed symmetrically in the AGS ring. This modification provides many advantages over the present setup of the AGS that uses two partial helical magnets. First, it provides a larger 'spin tune gap' for the placement of the vertical betatron tune of the AGS during acceleration, second, the vertical spin direction during the beam injection and extraction is closer to vertical, third, the symmetric placement ofmore » the snakes allows for a better control of the AGS optics, and for reduced values of the beta and eta functions, especially near injection, fourth, the optical properties of the helical magnets also favor the placement of the horizontal betatron tune in the 'spin tune gap', thus eliminating the horizontal spin resonances. In this paper we provide results on the spin tune and on the optics of the AGS with four partial helical magnets, and we compare these results with the present setup of the AGS that uses two partial helical magnets.« less
  • Magnetic measurements performed on the 12-pole trim magnets is described including Hall probe measurements to verify symmetry of the field and, rotating coil measurements to map the multipoles. The rotating coil measurements were carried out using a HP Dynamic Signal Analyzer. Excited as a quadrupole the dominant error multipole is the 20th pole and excited as a sextrupole the dominant error multipole is the 18th pole. Reasonable agreement was found between the Hall probe measurements and the rotating coil measurements. 2 refs., 5 figs.
  • The design of the dipoles and quadrupoles for the magnetic circuit of the SATURNE II new synchrotron was theoretically studied with bidimensional programs Magnet and Poisson. The main features of these magnets are a large aperture, a short length, a high cycling rate, and curved dipoles (made from elementary glued blocks). The magnetic measurements are made by punctual and integral coils, which enable one to verify the quality of the magnets and also to adjust the geometry of the end of the poles of the quadrupoles.