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Title: Design of a modified Halbach magnet for the CBETA project

Authors:
; ; ; ; ; ; ; ; ; ;
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:
1399666
Report Number(s):
BNL-114363-2017-CP
R&D Project: KBCH139; KB0202011
DOE Contract Number:
SC0012704
Resource Type:
Conference
Resource Relation:
Conference: Thirteenth International Topical Meeting on Nuclear Applications of Accelerators (AccApp17); Hilton Quebec Hotel, in Quebec City, Quebec, Canada ; 20170731 through 20170804
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Tsoupas N., Berg, J. S., Brooks, S., Mahler, G., Meot, F., Peggs, S., Ptitsyn, V., Roser, T., Burke, D., Crittenden, J., and Mayes, C.. Design of a modified Halbach magnet for the CBETA project. United States: N. p., 2017. Web.
Tsoupas N., Berg, J. S., Brooks, S., Mahler, G., Meot, F., Peggs, S., Ptitsyn, V., Roser, T., Burke, D., Crittenden, J., & Mayes, C.. Design of a modified Halbach magnet for the CBETA project. United States.
Tsoupas N., Berg, J. S., Brooks, S., Mahler, G., Meot, F., Peggs, S., Ptitsyn, V., Roser, T., Burke, D., Crittenden, J., and Mayes, C.. 2017. "Design of a modified Halbach magnet for the CBETA project". United States. doi:. https://www.osti.gov/servlets/purl/1399666.
@article{osti_1399666,
title = {Design of a modified Halbach magnet for the CBETA project},
author = {Tsoupas N. and Berg, J. S. and Brooks, S. and Mahler, G. and Meot, F. and Peggs, S. and Ptitsyn, V. and Roser, T. and Burke, D. and Crittenden, J. and Mayes, C.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 7
}

Conference:
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  • The general question of when and why one should use a Halbach rotor in the design of surface-mounted permanent-magnet synchronous motors is addressed. The torque production capabilities of Halbach and conventional magnet arrays under the constraints of fixed magnet volume, and fixed power dissipation in slotless armature windings, are compared and the results presented in a graphical manner along with intuitive models that qualitatively explain these results. They conclude that, for permanent-magnet synchronous motors where the application precludes the use of a magnetic back-iron, the Halbach array always produces higher torque than the conventional array, for the same volume ofmore » magnets. The use of a magnetic back-iron in both designs increases the achievable torque. However, for magnetically-backed rotors, the conventional array, with an optimized pole-arc to pole-pitch ratio, produces higher torque than the Halbach array up to a certain thickness of magnets. Above this thickness, the Halbach array produces a higher torque.« less
  • The splitter/merger section of the CBETA project [1] consists of 4 beam lines as shown in Fig. 1. Two of the functions of the splitter’s/merger’s lines is to match the beam parameters at the exit of the Energy Recovery Linac (ERL) to the beam parameters at the entrance of the Fixed Field Alternating Gradient (FFAG) arc, and also place the reference particles of the beam bunches at the entrance of the FFAG arc on specified trajectories according to their energies. In this technical note we are presenting results from the 2D and 3D electromagnetic analysis of the S4.BEN01 magnet whichmore » is one of the dipole magnets of the 150 MeV line of the splitter/merger. In particular we present results from two designs of the S4.BEN01 magnet, one based on iron dominated current-excited magnet, and the other design based on Halbach-type permanent magnet. An evaluation of the two designs will be given in the section under “conclusion”.« less
  • The Cornell-Brookhaven Energy-Recovery-Linac Test Accelerator (CBETA) will provide a 150-MeV electron beam using four acceleration and four deceleration passes through the Cornell Main Linac Cryomodule housing six 1.3-GHz superconducting RF cavities. The return path of this 76-m-circumference accelerator will be provided by 106 fixed-field alternating-gradient (FFAG) cells which carry the four beams of 42, 78, 114 and 150 MeV. Here we describe magnet designs for the splitter and combiner regions which serve to match the on-axis linac beam to the off-axis beams in the FFAG cells, providing the path-length adjustment necessary to energy recovery for each of the four beams.more » The path lengths of the four beamlines in each of the splitter and combiner regions are designed to be adapted to 1-, 2-, 3-, and 4-pass staged operations. Design specifi- cations and modeling for the 24 dipole and 32 quadrupole electromagnets in each region are presented. The CBETA project will serve as the first demonstration of multi-pass energy recovery using superconducting RF cavities with FFAG cell optics for the return loop.« less