FLS2018 - List of Keywords (storage-ring)

Paper	Title	Other Keywords	Page
MOA2PL03	Review of New Developments in Superconducting Undulator Technology at the APS	ion, undulator, FEL, vacuum	1
	J.D. Fuerst, E. Gluskin, Q.B. Hasse, Y. Ivanyushenkov, M. Kasa, I. Kesgin, Y. Shiroyanagi ANL, Argonne, Illinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. Superconducting undulator (SCU) technology offers the possibility of enhancing the magnetic field of undulators compared to other undulator technologies. It also allows for the fabrication of circular polarizing devices in addition to the planar undulators. Work on SCUs therefore continues in the light source community. Recent developments in SCU technology will be presented.
	Slides MOA2PL03 [1.669 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOA2PL03
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MOP2WB01	Accelerator Physics Studies for the High Energy Photon Source (HEPS) in Beijing	ion, lattice, emittance, booster	22
	Y. Jiao, X. Cui, Z. Duan, Y.Y. Guo, D. Ji, J.Y. Li, X.Y. Li, Y.M. Peng, Q. Qin, S.K. Tian, J.Q. Wang, N. Wang, Y. Wei, G. Xu, H.S. Xu, F. Yan, C.H. Yu, Y.L. Zhao IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS) is the next ring-based light source with an emittance of tens of picometers, and a circumference of about 1.3 km to be built in China soon in a few years. After 10 years' evolution, the design for the High Energy Photon Source is recently bascially determined. We will report the lattice design and physics studies on HEPS, covering issues of storage lattice design and optimization, booster design, injection design, collective effects, error study, insertion device effects, longitudinal dynamics, etc.
	Slides MOP2WB01 [7.280 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOP2WB01
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MOP2WB04	Study of Multi-bend Achromat Lattices for the HALS Diffraction-limited Storage Ring	ion, lattice, sextupole, emittance	25
	Z.H. Bai, L. Wang USTC/NSRL, Hefei, Anhui, People's Republic of China
	In this paper, two multi-bend achromat (MBA) lattice concepts, the locally symmetric MBA and MBA with interleaved dispersion bumps, are described, which have been used to design the Hefei Advanced Light Source (HALS), a soft X-ray diffraction-limited storage ring proposed at NSRL. In these two MBA concepts, most of the nonlinear effects caused by sextupoles can be cancelled out within one lattice cell as in the hybrid MBA proposed by ESRF EBS, but the available family number of sextupoles in one cell can be more than that in the hybrid MBA so that, for example, the tune shift with momentum can be better controlled to increase the dynamic momentum aperture (MA). Using the two MBA concepts, three kinds of lattices, 8BA, 6BA and 7BA, have been studied for the HALS, showing large on- and off-momentum dynamic apertures and large enough dynamic MA.
	Slides MOP2WB04 [2.261 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOP2WB04
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TUA2WB04	Ion Instability in the HEPS Storage Ring	ion, electron, simulation, emittance	34
	S.K. Tian, N. Wang IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS), a kilometre scale storage ring light source, with a beam energy of 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing and now is under design. We investigate the ion instability in the storage ring with high beam intensity and low-emittance. We performe a weak-strong simulation to show characteristic phenomena of the instability in the storage ring.
	Slides TUA2WB04 [3.446 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUA2WB04
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TUP2WD04	Preliminary Design of HEPS Storge Ring Vacuum Chambers and Components	ion, vacuum, radiation, photon	52
	P. He, B. Deng, D.Z. Guo, Q. Li, B.Q. Liu, Y. Ma, Y.C. Yang, L. Zhang IHEP, Beijing, People's Republic of China X.J. Wang Institute of High Energy Physics (IHEP), People's Republic of China
	In the design process of HEPS vacuum system, we meet the following limitations. Vacuum chamber must fit inside multipole magnet bore diameter of 25mm (without touching). Water channels and x-ray extraction ports must pass through a 11mm vertical pole gap. Provide an average pressure of 1nTorr during operations with 200mA beam current. Control thermal drift of BPM to ~μm and vibration amplitude ~nm level. Minimize impedance effects. This paper introduces the design of various vacuum chambers, including material selection, mechanical simulation analysis, welding test and so on.
	Slides TUP2WD04 [4.062 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUP2WD04
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WEP2PT024	Influences of Harmonic Cavities on the Single-Bunch Instabilities in Electron Storage Rings	ion, cavity, impedance, operation	128
	H.S. Xu, N. Wang IHEP, Beijing, People's Republic of China
	Single-bunch instabilities usually determine the bunch performance at high charges as well as the highest single- bunch currents in storage rings. It has been demonstrated that the passive harmonic cavities, which have been widely used in electron storage rings of the third-generation synchrotron light sources, can generally make the beam more stable. However, the influences of the harmonic cavities on the single-bunch instabilities are still not fully understood. We hereby present our study of both longitudinal and transverse single-bunch instabilities when using different settings of the harmonic cavities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT024
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THP2WB02	An Overview of the Progress on SSMB	ion, radiation, lattice, focusing	166
	C.-X. Tang, X.J. Deng, W.-H. Huang, T. Rui TUB, Beijing, People's Republic of China A. Chao, D.F. Ratner SLAC, Menlo Park, California, USA J. Feikes, J. Li, M. Ries HZB, Berlin, Germany C. Feng, B.C. Jiang, X.F. Wang SINAP, Shanghai, People's Republic of China E. Granados MIT, Cambridge, Massachusetts, USA A. Hoehl PTB, Berlin, Germany
	Steady State Microbunching (SSMB) is an electron stor- age ring based scheme proposed by Ratner and Chao to generate high average power coherent radiation and is one of the promising candidates to address the need of kW level EUV source for lithography. After the idea of SSMB was put forward, it has attracted much attention. Recently, with the promote of Chao, in collaboration with colleagues from other institutes, a SSMB task force has been established in Tsinghua University. The experimental proof of the SSMB principle and a feasible lattice design for EUV SSMB are the two main tasks at this moment. SSMB related physics for the formation and maintenance of microbunches will be explored in the first optical proof-of-principle experiment at the MLS storage ring in Berlin. For EUV SSMB lattice design, longitudinal strong focusing and reversible seeding are the two schemes on which the team focuses. The pro- gresses made as well as some challenges from physical and technological aspects for EUV SSMB will be presented in this paper. on behalf of the SSMB team: C. Tang, Alex Chao, X. Deng, W. Huang, and T. Rui of THU; D. Ratner of SLAC; J. Feikes and M. Ries of Helmholtz-Zentrum Berlin; C. Feng, B. Jiang, and X. Wang of SINAP
	Slides THP2WB02 [7.924 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WB02
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THP2WB03	Transparent Lattice Characterization with Gated Turn-by-Turn Data of Diagnostic Bunch-Train	ion, lattice, operation, wakefield	171
	Y. Li, W.X. Cheng, K. Ha, R.S. Rainer BNL, Upton, Long Island, New York, USA
	Funding: This work was supported by Depart- ment of Energy Contract No. DE-SC0012704. Methods of characterization of a storage ring's lattice have traditionally been intrusive to routine operations. More importantly, the lattice seen by particles can drift with the beam current due to collective effects. To circumvent this, we have developed a novel approach for dynamically characterizing a storage ring's lattice that is transparent to operations. Our approach adopts a dedicated filling pattern which has a short, separate Diagnostic Bunch-Train (DBT). Gated functionality of a beam position monitor system is capable of collecting turn-by-turn data of the DBT, from which the lattice can then be characterized after excitation. As the DBT comprises only about one percent of the total operational bunches, the effects of its excitation are negligible to users. This approach allows us to localize the distributed quadrupolar wake fields generated in the storage ring vacuum chamber during beam accumulation. While effectively transparent to operations, our approach enables us to dynamically control the beta-beat and phase-beat, and unobtrusively optimize performance of National Synchrotron Light Source-II accelerator during routine operations.
	Slides THP2WB03 [0.711 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WB03
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THP2WB04	Laser Seeding of Electron Bunches for Future Ring-Based Light Sources	ion, laser, electron, radiation	177
	S. Khan, B. Büsing, N.M. Lockmann, C. Mai, A. Meyer auf der Heide, B. Riemann, B. Sawadski, M. Schmutzler, P. Ungelenk DELTA, Dortmund, Germany
	Funding: Funded by BMBF (05K16PEA, 05K16PEB), MERCUR (Pr-2014-0047), DFG (INST 212/236-1 FUGG) and the Land NRW. In contrast to free-electron lasers (FELs), ring-based light sources are limited in intensity by incoherent emission and in pulse duration by the bunch length. However, FEL seeding schemes can be adopted to generate intense and ultrashort radiation pulses in storage rings by creating laser-induced microbunches within a short slice of the electron bunch. Microbunching gives rise to coherent emission at harmonics of the seed wavelength. In addition, terahertz (THz) radiation is coherently emitted over many turns. At DELTA, a storage ring operated by the TU Dortmund University, coherent harmonic generation (CHG) with single and double 40-fs pulses is routinely performed at seed wavelengths of 800 and 400 nm. Seeding with intensity-modulated pulses to generate tunable narrowband THz radiation is also studied. As a preparation for echo-enabled harmonic generation (EEHG), simultaneous seeding with 800/400-nm pulses in two undulators has been demonstrated. The DELTA storage ring is an excellent testbed to study many aspects of laser seeding and related diagnostics. In addition to short-pulse generation, steady-state microbunching at ring-based light sources will be discussed in the paper.
	Slides THP2WB04 [5.103 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WB04
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOA2PL03

Review of New Developments in Superconducting Undulator Technology at the APS

ion, undulator, FEL, vacuum

1

J.D. Fuerst, E. Gluskin, Q.B. Hasse, Y. Ivanyushenkov, M. Kasa, I. Kesgin, Y. Shiroyanagi
ANL, Argonne, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Superconducting undulator (SCU) technology offers the possibility of enhancing the magnetic field of undulators compared to other undulator technologies. It also allows for the fabrication of circular polarizing devices in addition to the planar undulators. Work on SCUs therefore continues in the light source community. Recent developments in SCU technology will be presented.

Slides MOA2PL03 [1.669 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOA2PL03

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MOP2WB01

Accelerator Physics Studies for the High Energy Photon Source (HEPS) in Beijing

ion, lattice, emittance, booster

22

Y. Jiao, X. Cui, Z. Duan, Y.Y. Guo, D. Ji, J.Y. Li, X.Y. Li, Y.M. Peng, Q. Qin, S.K. Tian, J.Q. Wang, N. Wang, Y. Wei, G. Xu, H.S. Xu, F. Yan, C.H. Yu, Y.L. Zhao
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS) is the next ring-based light source with an emittance of tens of picometers, and a circumference of about 1.3 km to be built in China soon in a few years. After 10 years' evolution, the design for the High Energy Photon Source is recently bascially determined. We will report the lattice design and physics studies on HEPS, covering issues of storage lattice design and optimization, booster design, injection design, collective effects, error study, insertion device effects, longitudinal dynamics, etc.

Slides MOP2WB01 [7.280 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOP2WB01

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP2WB04

Study of Multi-bend Achromat Lattices for the HALS Diffraction-limited Storage Ring

ion, lattice, sextupole, emittance

25

Z.H. Bai, L. Wang
USTC/NSRL, Hefei, Anhui, People's Republic of China

In this paper, two multi-bend achromat (MBA) lattice concepts, the locally symmetric MBA and MBA with interleaved dispersion bumps, are described, which have been used to design the Hefei Advanced Light Source (HALS), a soft X-ray diffraction-limited storage ring proposed at NSRL. In these two MBA concepts, most of the nonlinear effects caused by sextupoles can be cancelled out within one lattice cell as in the hybrid MBA proposed by ESRF EBS, but the available family number of sextupoles in one cell can be more than that in the hybrid MBA so that, for example, the tune shift with momentum can be better controlled to increase the dynamic momentum aperture (MA). Using the two MBA concepts, three kinds of lattices, 8BA, 6BA and 7BA, have been studied for the HALS, showing large on- and off-momentum dynamic apertures and large enough dynamic MA.

Slides MOP2WB04 [2.261 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-MOP2WB04

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TUA2WB04

Ion Instability in the HEPS Storage Ring

ion, electron, simulation, emittance

34

S.K. Tian, N. Wang
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS), a kilometre scale storage ring light source, with a beam energy of 6 GeV and transverse emittances of a few tens of pm.rad, is to be built in Beijing and now is under design. We investigate the ion instability in the storage ring with high beam intensity and low-emittance. We performe a weak-strong simulation to show characteristic phenomena of the instability in the storage ring.

Slides TUA2WB04 [3.446 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUA2WB04

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TUP2WD04

Preliminary Design of HEPS Storge Ring Vacuum Chambers and Components

ion, vacuum, radiation, photon

52

P. He, B. Deng, D.Z. Guo, Q. Li, B.Q. Liu, Y. Ma, Y.C. Yang, L. Zhang
IHEP, Beijing, People's Republic of China
X.J. Wang
Institute of High Energy Physics (IHEP), People's Republic of China

In the design process of HEPS vacuum system, we meet the following limitations. Vacuum chamber must fit inside multipole magnet bore diameter of 25mm (without touching). Water channels and x-ray extraction ports must pass through a 11mm vertical pole gap. Provide an average pressure of 1nTorr during operations with 200mA beam current. Control thermal drift of BPM to ~μm and vibration amplitude ~nm level. Minimize impedance effects. This paper introduces the design of various vacuum chambers, including material selection, mechanical simulation analysis, welding test and so on.

Slides TUP2WD04 [4.062 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-TUP2WD04

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WEP2PT024

Influences of Harmonic Cavities on the Single-Bunch Instabilities in Electron Storage Rings

ion, cavity, impedance, operation

128

H.S. Xu, N. Wang
IHEP, Beijing, People's Republic of China

Single-bunch instabilities usually determine the bunch performance at high charges as well as the highest single- bunch currents in storage rings. It has been demonstrated that the passive harmonic cavities, which have been widely used in electron storage rings of the third-generation synchrotron light sources, can generally make the beam more stable. However, the influences of the harmonic cavities on the single-bunch instabilities are still not fully understood. We hereby present our study of both longitudinal and transverse single-bunch instabilities when using different settings of the harmonic cavities.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT024

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP2WB02

An Overview of the Progress on SSMB

ion, radiation, lattice, focusing

166

C.-X. Tang, X.J. Deng, W.-H. Huang, T. Rui
TUB, Beijing, People's Republic of China
A. Chao, D.F. Ratner
SLAC, Menlo Park, California, USA
J. Feikes, J. Li, M. Ries
HZB, Berlin, Germany
C. Feng, B.C. Jiang, X.F. Wang
SINAP, Shanghai, People's Republic of China
E. Granados
MIT, Cambridge, Massachusetts, USA
A. Hoehl
PTB, Berlin, Germany

Steady State Microbunching (SSMB) is an electron stor- age ring based scheme proposed by Ratner and Chao to generate high average power coherent radiation and is one of the promising candidates to address the need of kW level EUV source for lithography. After the idea of SSMB was put forward, it has attracted much attention. Recently, with the promote of Chao, in collaboration with colleagues from other institutes, a SSMB task force has been established in Tsinghua University. The experimental proof of the SSMB principle and a feasible lattice design for EUV SSMB are the two main tasks at this moment. SSMB related physics for the formation and maintenance of microbunches will be explored in the first optical proof-of-principle experiment at the MLS storage ring in Berlin. For EUV SSMB lattice design, longitudinal strong focusing and reversible seeding are the two schemes on which the team focuses. The pro- gresses made as well as some challenges from physical and technological aspects for EUV SSMB will be presented in this paper.
on behalf of the SSMB team: C. Tang, Alex Chao, X. Deng, W. Huang, and T. Rui of THU; D. Ratner of SLAC; J. Feikes and M. Ries of Helmholtz-Zentrum Berlin; C. Feng, B. Jiang, and X. Wang of SINAP

Slides THP2WB02 [7.924 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WB02

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP2WB03

Transparent Lattice Characterization with Gated Turn-by-Turn Data of Diagnostic Bunch-Train

ion, lattice, operation, wakefield

171

Y. Li, W.X. Cheng, K. Ha, R.S. Rainer
BNL, Upton, Long Island, New York, USA

Funding: This work was supported by Depart- ment of Energy Contract No. DE-SC0012704.
Methods of characterization of a storage ring's lattice have traditionally been intrusive to routine operations. More importantly, the lattice seen by particles can drift with the beam current due to collective effects. To circumvent this, we have developed a novel approach for dynamically characterizing a storage ring's lattice that is transparent to operations. Our approach adopts a dedicated filling pattern which has a short, separate Diagnostic Bunch-Train (DBT). Gated functionality of a beam position monitor system is capable of collecting turn-by-turn data of the DBT, from which the lattice can then be characterized after excitation. As the DBT comprises only about one percent of the total operational bunches, the effects of its excitation are negligible to users. This approach allows us to localize the distributed quadrupolar wake fields generated in the storage ring vacuum chamber during beam accumulation. While effectively transparent to operations, our approach enables us to dynamically control the beta-beat and phase-beat, and unobtrusively optimize performance of National Synchrotron Light Source-II accelerator during routine operations.

Slides THP2WB03 [0.711 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WB03

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP2WB04

Laser Seeding of Electron Bunches for Future Ring-Based Light Sources

ion, laser, electron, radiation

177

S. Khan, B. Büsing, N.M. Lockmann, C. Mai, A. Meyer auf der Heide, B. Riemann, B. Sawadski, M. Schmutzler, P. Ungelenk
DELTA, Dortmund, Germany

Funding: Funded by BMBF (05K16PEA, 05K16PEB), MERCUR (Pr-2014-0047), DFG (INST 212/236-1 FUGG) and the Land NRW.
In contrast to free-electron lasers (FELs), ring-based light sources are limited in intensity by incoherent emission and in pulse duration by the bunch length. However, FEL seeding schemes can be adopted to generate intense and ultrashort radiation pulses in storage rings by creating laser-induced microbunches within a short slice of the electron bunch. Microbunching gives rise to coherent emission at harmonics of the seed wavelength. In addition, terahertz (THz) radiation is coherently emitted over many turns. At DELTA, a storage ring operated by the TU Dortmund University, coherent harmonic generation (CHG) with single and double 40-fs pulses is routinely performed at seed wavelengths of 800 and 400 nm. Seeding with intensity-modulated pulses to generate tunable narrowband THz radiation is also studied. As a preparation for echo-enabled harmonic generation (EEHG), simultaneous seeding with 800/400-nm pulses in two undulators has been demonstrated. The DELTA storage ring is an excellent testbed to study many aspects of laser seeding and related diagnostics. In addition to short-pulse generation, steady-state microbunching at ring-based light sources will be discussed in the paper.

Slides THP2WB04 [5.103 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WB04

Export •

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