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Title: Optimization of low aspect ratio, iron dominated dipole magnets

Abstract

A study of the optimization of iron dominated dipole magnets with pole face widths comparable or less than the gap size, i.e., low aspect ratio (AR), is conducted using both theoretical and computational approaches. This regime of magnet design is particularly relevant in the context of laser plasma accelerators (LPA) due to unique beam parameters and geometric constraints, namely large energy spreads and the requirement for large apertures to accommodate drive laser passage. The breakdown of commonly employed approximations and rules of thumb in typical AR >> 1 magnet design is examined. A library of generalized, optimized pole face geometries is provided to expedite optimization of future magnets. Finally, this methodology is used to design an electromagnetic chicane which has been fabricated, validated, and is currently in use in an x-ray free electron laser driven LPA experiment at LBNL.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); Gordon and Betty Moore Foundation
OSTI Identifier:
1503361
Alternate Identifier(s):
OSTI ID: 1604676
Grant/Contract Number:  
SC0014664; SC0009914; AC02-05CH11231; GBMF4898
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 3; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; beam optics; laser wakefield acceleration; magnetism; room-temperature magnet calculations; magnetic systems

Citation Formats

Majernik, N., Barber, S. K., van Tilborg, J., Rosenzweig, J. B., and Leemans, W. P. Optimization of low aspect ratio, iron dominated dipole magnets. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.032401.
Majernik, N., Barber, S. K., van Tilborg, J., Rosenzweig, J. B., & Leemans, W. P. Optimization of low aspect ratio, iron dominated dipole magnets. United States. doi:https://doi.org/10.1103/PhysRevAccelBeams.22.032401
Majernik, N., Barber, S. K., van Tilborg, J., Rosenzweig, J. B., and Leemans, W. P. Wed . "Optimization of low aspect ratio, iron dominated dipole magnets". United States. doi:https://doi.org/10.1103/PhysRevAccelBeams.22.032401.
@article{osti_1503361,
title = {Optimization of low aspect ratio, iron dominated dipole magnets},
author = {Majernik, N. and Barber, S. K. and van Tilborg, J. and Rosenzweig, J. B. and Leemans, W. P.},
abstractNote = {A study of the optimization of iron dominated dipole magnets with pole face widths comparable or less than the gap size, i.e., low aspect ratio (AR), is conducted using both theoretical and computational approaches. This regime of magnet design is particularly relevant in the context of laser plasma accelerators (LPA) due to unique beam parameters and geometric constraints, namely large energy spreads and the requirement for large apertures to accommodate drive laser passage. The breakdown of commonly employed approximations and rules of thumb in typical AR >> 1 magnet design is examined. A library of generalized, optimized pole face geometries is provided to expedite optimization of future magnets. Finally, this methodology is used to design an electromagnetic chicane which has been fabricated, validated, and is currently in use in an x-ray free electron laser driven LPA experiment at LBNL.},
doi = {10.1103/PhysRevAccelBeams.22.032401},
journal = {Physical Review Accelerators and Beams},
number = 3,
volume = 22,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1103/PhysRevAccelBeams.22.032401

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    Works referencing / citing this record:

    Optimization of Low Aspect Ratio, Iron Dominated Dipole Magnets
    text, January 2019

    • Majernik, N.; Barber, S. K.; Van Tilborg, J.
    • Deutsches Elektronen-Synchrotron, DESY, Hamburg
    • DOI: 10.3204/pubdb-2020-00831