FEM models and Fourier decomposition of three thick septa

Benesch, J.

doi:10.1088/1748-0221/13/11/T11001

Title: FEM models and Fourier decomposition of three thick septa

Abstract

Here, the CEBAF recirculating linear accelerator uses 26 septa: 8 thin, 17 thick and one Lamberston. We report here on detailed FEM models of one thick current-sheet septum, the Lambertson, and a new thick-septum concept which contains features of both. The last has higher-order field components within a factor of two of the current-sheet septum and much lower current density in the conductor were it used as a 'drop-in' replacement in CEBAF. There are accelerator layouts in which the new concept is superior to the current sheet septum in both harmonic content and current density.

Authors:

Benesch, J. ^[1]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Publication Date:: Mon Nov 12 00:00:00 EST 2018

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1481850

Report Number(s):: JLAB-ACO-18-2809; DOE/OR/23177-4539; arXiv:1809.10568
Journal ID: ISSN 1748-0221

Grant/Contract Number:: AC05-06OR23177

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Instrumentation

Additional Journal Information:: Journal Volume: 13; Journal Issue: 11; Journal ID: ISSN 1748-0221

Publisher:: Institute of Physics (IOP)

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION; Acceleration cavities and magnets superconducting (high-temperature superconductor; radiation hardened magnets; normal-conducting; permanent magnet devices; wigglers and undulators); Accelerator Subsystems and Technologies

Citation Formats


                    Benesch, J. FEM models and Fourier decomposition of three thick septa.  United States: N. p., 2018. 
Web.  doi:10.1088/1748-0221/13/11/T11001.

Copy to clipboard


                    Benesch, J. FEM models and Fourier decomposition of three thick septa.  United States.  https://doi.org/10.1088/1748-0221/13/11/T11001

Copy to clipboard


                    Benesch, J. Mon .  
"FEM models and Fourier decomposition of three thick septa".  United States.  https://doi.org/10.1088/1748-0221/13/11/T11001.  https://www.osti.gov/servlets/purl/1481850.

Copy to clipboard


                    
@article{osti_1481850,

  title        = {FEM models and Fourier decomposition of three thick septa},

  author       = {Benesch, J.},

  abstractNote = {Here, the CEBAF recirculating linear accelerator uses 26 septa: 8 thin, 17 thick and one Lamberston. We report here on detailed FEM models of one thick current-sheet septum, the Lambertson, and a new thick-septum concept which contains features of both. The last has higher-order field components within a factor of two of the current-sheet septum and much lower current density in the conductor were it used as a 'drop-in' replacement in CEBAF. There are accelerator layouts in which the new concept is superior to the current sheet septum in both harmonic content and current density.},

  doi          = {10.1088/1748-0221/13/11/T11001},

  journal      = {Journal of Instrumentation},

  number       = 11,

  volume       = 13,

  place        = {United States},

  year         = {Mon Nov 12 00:00:00 EST 2018},

  month        = {Mon Nov 12 00:00:00 EST 2018}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1088/1748-0221/13/11/T11001

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

The new septum magnets
journal, August 2005

Lindgren, Lars-Johan; Anderberg, Bengt
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 547, Issue 2-3
DOI: 10.1016/j.nima.2005.04.006

DC Septum Magnets and Their Leakage Field Effects on an Electron Beam in the SPring-8 Storage Ring
journal, June 2004

Tsumaki, K.; Shimada, T.; Kajimoto, K.
IEEE Transactions on Appiled Superconductivity, Vol. 14, Issue 2
DOI: 10.1109/tasc.2004.829689

Design and Construction of Septum Magnets at 3-GeV RCS in J-PARC
journal, June 2008

Yoshimoto, M.; Ueno, T.; Togashi, T.
IEEE Transactions on Applied Superconductivity, Vol. 18, Issue 2
DOI: 10.1109/tasc.2008.922282

Compact spreader schemes
journal, December 2014

Placidi, M.; Jung, J. -Y.; Ratti, A.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 768
DOI: 10.1016/j.nima.2014.09.017

T HE C ONTINUOUS E LECTRON B EAM A CCELERATOR F ACILITY : CEBAF at the Jefferson Laboratory
journal, December 2001

Leemann, Christoph W.; Douglas, David R.; Krafft, Geoffrey A.
Annual Review of Nuclear and Particle Science, Vol. 51, Issue 1
DOI: 10.1146/annurev.nucl.51.101701.132327

The Heavy Photon Search beamline and its performance
journal, July 2017

Baltzell, N.; Egiyan, H.; Ehrhart, M.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 859
DOI: 10.1016/j.nima.2017.03.061

Similar Records in DOE PAGES and OSTI.GOV collections:

Beam transport magnets for CEBAF

Technical Report Harwood, L. H. ; Biallas, G. ; Boyce, J. R. ; ...

With respect to the optical system, the challenging parameters of the Continuous Electron Beam Accelerator Facility (CEBAF), a five pass recirculating electron linac, are the design goals for the emittance and energy spread of its beam. The design goals are an emittance of 2 /times/ 10/sup /minus/9/ m-rad at E < 1 GeV and an energy spread of ..delta..E/E (4sigma) of 10/sup /minus/4/. The nominal operating energy range of the machine is to be from 0.5 to 4 GeV. The optics to make this possible have been developed and are presented by other participants at this conference. The magnetic elementsmore »« less
https://doi.org/10.2172/6080743

Full Text Available
Magnetic pulsed septa for the synchrotron Pakhra''

Conference Bashmakov, Yu A ; Karpov, V A - IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

Slow extraction system of the Synchrotron Pakhra'' contains two pulsed septum magnets. They are located inside the synchrotron vacuum chamber. Both the soft and the hard septum magnets have similar mechanical construction. They consist of four magnetic blocks split by three copper brackets. The dimensions of the magnetic gap are 1.2 cm height and 3.6 cm width. The soft septum thickness is 0.1 cm. The septum is cooled indirectly by the copper brackets. The fringing field is less than 2% of the field in the core gap. To generate the maximum field of 0.08 T in an one-turn winding 800more »« less
Radiation levels around the Fermilab Main Injector extraction septa

Conference Bhat, C M ; Mokhov, N V

The Fermilab Main Injector extraction system will be capable of delivering a uniform 120 GeV beam of {approx} 3 x 10{sup 13} protons per spill to the fixed target experiments ( with spill time of 1 sec). Up to 2% of the beam is expected to be lost at the extraction septum and the Lambertson magnet. As a result, one expects increased radiation levels around the septa compared to other parts of the Main Injector. Realistic Monte-Carlo simulations have been performed to estimate the instantaneous and residual radiation levels in the beam extraction region. The results of these studies aremore »« less
Full Text Available
Radiation heating from beam loss on ISABELLE ejection septa

Conference Stevens, A J

It is anticipated that radiation heating due to beam loss may place severe constraints on the operation of high energy accelerators which utilize superconducting magnets. Losses on ejection septa, assuming an unbunched beam mode of operation, are unavoidable and have direct impact on the design of the extraction system. Calculations of energy deposition densities downstream of ISABELLE ejection septa have been made using a modified version of the hadron cascade Monte Carlo computer program CASIM. The results of these calculations are described, giving emphasis to understanding the physical processes which dominate the energy deposition as a function of lattice geometry,more »« less
Full Text Available
Direct drive and eddy-current septum magnets.

Technical Report Kim, S H

Two types of thin septum magnets, direct drive and eddy current, were compared mainly in 2-D magnetic aspects. For the direct-drive type, the leakage field depended on the finite permeability of the magnet core and not on the thickness of the septum conductor. It was suggested that the leakage field be controlled by reducing the current in the septum conductor or by using a correction coil. There were no significant differences between the two types regarding thermal problems caused by high current densities in the thin septa. The leakage fields with 2-mm septum thicknesses were calculated using OPERA-2d to comparemore »« less
https://doi.org/10.2172/786922

Full Text Available

Similar Records

Title: FEM models and Fourier decomposition of three thick septa

Abstract

Citation Formats

The new septum magnets journal, August 2005

DC Septum Magnets and Their Leakage Field Effects on an Electron Beam in the SPring-8 Storage Ring journal, June 2004

Design and Construction of Septum Magnets at 3-GeV RCS in J-PARC journal, June 2008

Compact spreader schemes journal, December 2014

T HE C ONTINUOUS E LECTRON B EAM A CCELERATOR F ACILITY : CEBAF at the Jefferson Laboratory journal, December 2001

The Heavy Photon Search beamline and its performance journal, July 2017

The new septum magnets
journal, August 2005

DC Septum Magnets and Their Leakage Field Effects on an Electron Beam in the SPring-8 Storage Ring
journal, June 2004

Design and Construction of Septum Magnets at 3-GeV RCS in J-PARC
journal, June 2008

Compact spreader schemes
journal, December 2014

T HE C ONTINUOUS E LECTRON B EAM A CCELERATOR F ACILITY : CEBAF at the Jefferson Laboratory
journal, December 2001

The Heavy Photon Search beamline and its performance
journal, July 2017