Final test results for the SNS ring dipoles

Author

Wanderer, P. ; Jackson, J. ; Jain, A. ; Lee, Y.-Y. ; Meng, W. ; Papaphilippou, Y. ; Spataro, C. ; Tepikian, S. ; Tsoupas, N. ; Wei, J.

Author_Institution

Brookhaven Nat. Lab., Upton, NY, USA

Volume

4

fYear

2003

fDate

12-16 May 2003

Firstpage

2159

Abstract

To meet the performance parameters of the Spallation Neutron Source (SNS) for high beam intensity with low losses, the compact accumulation ring will contain 32 sector dipoles with 1.44 m effective length and a large aperture, 170 mm. The magnets are built from potted coils and machined pieces of solid iron. When first assembled, the dipoles met the requirements for field uniformity but the rms variation of the integral transfer function (ITF) was much larger than design at both fields of interest, 1.11 T·m and 1.33 T·m, corresponding to proton energies of 1.0 GeV and 1.3 GeV respectively. Based on initial measurements, shims have been added to the return legs or poles, as appropriate, in order to bring the rms variation of the 1.0 GeV ITF to the specification, 0.01%. The value of the ITF rms variation at 1.3 GeV for the shimmed magnets is 0.033%. Sorting the magnets has significantly reduced the load on the correctors due to this ITF variation.

Keywords

accelerator magnets; magnetic field measurement; neutron sources; proton accelerators; storage rings; 1.44 m; 170 mm; SNS ring dipoles; Spallation Neutron Source; compact accumulation ring; correctors; high beam intensity; integral transfer function; performance parameters; proton energies; rms variation; sector dipoles; shimmed magnets; solid iron; Apertures; Assembly; Coils; Iron; Magnets; Neutrons; Performance loss; Solids; Testing; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289051

Filename

1289051