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Title: Complex bend: Strong-focusing magnet for low-emittance synchrotrons

Abstract

Modern synchrotron light sources are competing intensively to increase x-ray brightness and, eventually, approach the diffraction limit, which sets the final goal of lattice emittance. All recent synchrotron facility upgrades follow the multibend achromat approach by arranging small horizontal beta function and dispersion inside discrete bending dipoles. In this paper we propose a concept of a lattice element that we call “complex bend,” which has the potential of becoming a main building block for low emittance lattices. The complex bend is a sequence of dipole poles interleaved with strong alternate focusing so as to maintain the beta function and dispersion oscillating at low values. Comprising the ring lattice with complex bends, instead of regular dipoles, will minimize the H-function and reduce horizontal emittance while localizing bending to a small fraction of the storage ring circumference, which should provide more space for insertion devices. In this paper we present the details of the complex bend, considerations regarding the choice of optimal parameters, and thoughts for its practical realization. We focus here on complex bend physics and engineering design, rather than integration of this complex bend into a specific ring lattice.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source–II
  2. Russian Academy of Sciences (RAS), Novosibirsk (Russian Federation). Budker Inst. of Nuclear Physics
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1479142
Alternate Identifier(s):
OSTI ID: 1482365
Report Number(s):
BNL-209452-2018-JAAM
Journal ID: ISSN 2469-9888
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 21; Journal Issue: 10; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; beam dynamics; beam optics; cryogenics & vacuum technology; superconducting magnet calculations

Citation Formats

Wang, G., Shaftan, T., Smaluk, V., Mezentsev, N. A., Sharma, S., Chubar, O., Hidaka, Y., and Spataro, C. Complex bend: Strong-focusing magnet for low-emittance synchrotrons. United States: N. p., 2018. Web. doi:10.1103/PhysRevAccelBeams.21.100703.
Wang, G., Shaftan, T., Smaluk, V., Mezentsev, N. A., Sharma, S., Chubar, O., Hidaka, Y., & Spataro, C. Complex bend: Strong-focusing magnet for low-emittance synchrotrons. United States. doi:10.1103/PhysRevAccelBeams.21.100703.
Wang, G., Shaftan, T., Smaluk, V., Mezentsev, N. A., Sharma, S., Chubar, O., Hidaka, Y., and Spataro, C. Thu . "Complex bend: Strong-focusing magnet for low-emittance synchrotrons". United States. doi:10.1103/PhysRevAccelBeams.21.100703.
@article{osti_1479142,
title = {Complex bend: Strong-focusing magnet for low-emittance synchrotrons},
author = {Wang, G. and Shaftan, T. and Smaluk, V. and Mezentsev, N. A. and Sharma, S. and Chubar, O. and Hidaka, Y. and Spataro, C.},
abstractNote = {Modern synchrotron light sources are competing intensively to increase x-ray brightness and, eventually, approach the diffraction limit, which sets the final goal of lattice emittance. All recent synchrotron facility upgrades follow the multibend achromat approach by arranging small horizontal beta function and dispersion inside discrete bending dipoles. In this paper we propose a concept of a lattice element that we call “complex bend,” which has the potential of becoming a main building block for low emittance lattices. The complex bend is a sequence of dipole poles interleaved with strong alternate focusing so as to maintain the beta function and dispersion oscillating at low values. Comprising the ring lattice with complex bends, instead of regular dipoles, will minimize the H-function and reduce horizontal emittance while localizing bending to a small fraction of the storage ring circumference, which should provide more space for insertion devices. In this paper we present the details of the complex bend, considerations regarding the choice of optimal parameters, and thoughts for its practical realization. We focus here on complex bend physics and engineering design, rather than integration of this complex bend into a specific ring lattice.},
doi = {10.1103/PhysRevAccelBeams.21.100703},
journal = {Physical Review Accelerators and Beams},
number = 10,
volume = 21,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.21.100703

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Works referenced in this record:

Future development plans for the MAX IV light source: Pushing further towards higher brightness and coherence
journal, April 2018

  • Tavares, Pedro Fernandes; Bengtsson, Johan; Andersson, Åke
  • Journal of Electron Spectroscopy and Related Phenomena, Vol. 224
  • DOI: 10.1016/j.elspec.2017.09.010

Superconducting Wigglers
journal, May 2011