FLS2018 - List of Keywords (vacuum)

Paper	Title	Other Keywords	Page
MOA2PL03	Review of New Developments in Superconducting Undulator Technology at the APS	ion, undulator, FEL, storage-ring	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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TUP2WD04	Preliminary Design of HEPS Storge Ring Vacuum Chambers and Components	ion, storage-ring, 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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WEP2PT023	Preparation and Characterization of Non-Evaporable Ti-Zr-V Getter Films for HEPS	ion, site, experiment, radiation	125
	Y. Ma, D.Z. Guo, P. He, B. Liu, Y.C. Yang IHEP, Beijing, People's Republic of China
	For the low activation temperature and high pumping speed, surface pumping capacity, the TiZrV coatings were chosen to high energy photo source (HEPS). Films of TiZrV alloy have been deposited on 1.5 meter long, cylindrical vacuum chambers of 22mm diameter copper substrates in krypton ambient using DC magnetron sputtering system. Film composition, the activation temperature and pumping properties have been investigated in order to optimize the deposition parameters for vacuum applications. The films were also studied using the X-ray photo-emission electron spectroscopy (XPS) after annealing them at different temperatures ranging from 120°C to 300°C for two hours in ultra-high vacuum environment. Pumping speed and surface pumping capacity testing facilities were also being constructed to investigate the characterization of TiZrV.
	Poster WEP2PT023 [1.037 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT023
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WEP2PT038	Conceptual Design for SLS-2	ion, lattice, quadrupole, emittance	150
	M.M. Dehler, A. Citterio, T. Garvey, M. Hahn, M. Negrazus, L. Schulz, A. Streun, V. Vranković PSI, Villigen PSI, Switzerland
	After 17 years of user operation, we plan to do an upgrade of the Swiss Light Source (SLS) for the period of 2021-2024. The entire storage ring will be replaced with a new layout allowing operation at emittances lowered by factors of 40-50. This is made possible to one part by small aperture magnets allowing for a multi bend achromat design and to the other - a special feature for SLS-2 - reverse bends combined with longitudinal gradient bends (LGB) leading to zero dispersion at the maximum magnetic field, thus minimizing the quantum excitation of the beam due to synchrotron radiation. The compact magnet layout makes use of offset quadrupoles, combined function magnets and longitudinal gradient bends. The chamber with a cross section of 20 mm will be fully NEG coated to ensure good pumping and a quick vacuum conditioning. Numerical simulation of instability thresholds has been performed, we expect values in the order of 2 mA for the single bunch current.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT038
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THP1WB02	Impedance Evaluation of PF In-Vacuum Undulator (IVU) with Theories and Simulations and Experimental Confirmation of them by the Tune Measurement	ion, impedance, simulation, undulator	160
	O. Tanaka, N. Nakamura, T. Obina, K. Tsuchiya KEK, Ibaraki, Japan
	Four In-Vacuum Undulators (IVU) were recently installed to Photon Factory (PF) at KEK. The estimate of their impedance and kick factors is a very important issue, because they could considerably increase the total impedance of PF. Moreover, the coupling impedance of the IVUs could lead to the beam energy loss, changes in the bunch shape, betatron tune shifts and, finally, to the various beam instabilities. Using the simulation tool (CST Particle Studio), longitudinal and transverse impedances of the IVUs were evaluated and compared to analytical formulas and measurement results. The study provides guidelines for mitigation of unwanted impedance, for an accurate estimate of its effects on the beam quality and beam instabilities and for the impedance budget of a newly designed next-generation machine which has many IVUs and small-aperture beam pipes.
	Slides THP1WB02 [2.942 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP1WB02
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THP2WD01	Construction and Optimization of Cryogenic Undulators at SOLEIL	ion, undulator, cryogenics, electron	193
	M. Valléau, P. Berteaud, F. Briquez, P. Brunelle, N. Béchu, M.-E. Couprie, J. Da Silva Castro, J.M. Dubuisson, A. Ghaith, C. Herbeaux, J. Idam, C.A. Kitegi, F. Lepage, A. Lestrade, M. Louvet, O. Marcouillé, F. Marteau, A. Mary, A. Nadji, L.S. Nadolski, P. Rommeluère, M. Sebdaoui, A. Somogyi, K.T. Tavakoli, M. Tilmont, T. Weitkamp SOLEIL, Gif-sur-Yvette, France
	Funding: Synchrotron SOLEIL, L'Orme des Merisiers, 91 192 BP 34 Gif-sur-Yvette, France, With permanent magnets undulator operation at cryogenic temperature, the magnetic field and the coercivity can be enhanced, enabling shorter periods with high magnetic fields. The first full scale (2 m long, 18 mm period) hybrid cryogenic undulator [1] using PrFeB [2] magnets operating at 77 K was installed at SOLEIL in 2011. Photon spectra measurements, in good agreement with the ex-pectations from magnetic measurements, were used for precise alignment and taper optimization. The second and third 18 mm PrFeB cryogenic undulators, modified to a half-pole/magnet/half-pole structure, were optimized without any magnet or pole shimming after assembly but mechanical sortings and some geometrical corrections had been done before assembly. A systematic error on individual magnets on the third U18 was also compensated. In-situ measurement benches, including a Hall probe and a stretched wire to optimize the undulator field at room and cryogenic temperature are presented. An upgrade of these in-situ benches will be detailed with the fabrication of a 15 mm 3 m long PrFeB cryogenic undulator at SOLEIL. [1] C. Benabderrahmane, M. Valléau, M. E. Couprie, Phys. Rev. Accel. Beams 20, 033201(2017) [2] C. Benabderrahmane, M. Valléau, M. E. Couprie, NIMA 669, 1-6, (2012)
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WD01
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Paper

Title

Other Keywords

Page

MOA2PL03

Review of New Developments in Superconducting Undulator Technology at the APS

ion, undulator, FEL, storage-ring

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

Export •

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

TUP2WD04

Preliminary Design of HEPS Storge Ring Vacuum Chambers and Components

ion, storage-ring, 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

Export •

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

WEP2PT023

Preparation and Characterization of Non-Evaporable Ti-Zr-V Getter Films for HEPS

ion, site, experiment, radiation

125

Y. Ma, D.Z. Guo, P. He, B. Liu, Y.C. Yang
IHEP, Beijing, People's Republic of China

For the low activation temperature and high pumping speed, surface pumping capacity, the TiZrV coatings were chosen to high energy photo source (HEPS). Films of TiZrV alloy have been deposited on 1.5 meter long, cylindrical vacuum chambers of 22mm diameter copper substrates in krypton ambient using DC magnetron sputtering system. Film composition, the activation temperature and pumping properties have been investigated in order to optimize the deposition parameters for vacuum applications. The films were also studied using the X-ray photo-emission electron spectroscopy (XPS) after annealing them at different temperatures ranging from 120°C to 300°C for two hours in ultra-high vacuum environment. Pumping speed and surface pumping capacity testing facilities were also being constructed to investigate the characterization of TiZrV.

Poster WEP2PT023 [1.037 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT023

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WEP2PT038

Conceptual Design for SLS-2

ion, lattice, quadrupole, emittance

150

M.M. Dehler, A. Citterio, T. Garvey, M. Hahn, M. Negrazus, L. Schulz, A. Streun, V. Vranković
PSI, Villigen PSI, Switzerland

After 17 years of user operation, we plan to do an upgrade of the Swiss Light Source (SLS) for the period of 2021-2024. The entire storage ring will be replaced with a new layout allowing operation at emittances lowered by factors of 40-50. This is made possible to one part by small aperture magnets allowing for a multi bend achromat design and to the other - a special feature for SLS-2 - reverse bends combined with longitudinal gradient bends (LGB) leading to zero dispersion at the maximum magnetic field, thus minimizing the quantum excitation of the beam due to synchrotron radiation. The compact magnet layout makes use of offset quadrupoles, combined function magnets and longitudinal gradient bends. The chamber with a cross section of 20 mm will be fully NEG coated to ensure good pumping and a quick vacuum conditioning. Numerical simulation of instability thresholds has been performed, we expect values in the order of 2 mA for the single bunch current.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-WEP2PT038

Export •

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

THP1WB02

Impedance Evaluation of PF In-Vacuum Undulator (IVU) with Theories and Simulations and Experimental Confirmation of them by the Tune Measurement

ion, impedance, simulation, undulator

160

O. Tanaka, N. Nakamura, T. Obina, K. Tsuchiya
KEK, Ibaraki, Japan

Four In-Vacuum Undulators (IVU) were recently installed to Photon Factory (PF) at KEK. The estimate of their impedance and kick factors is a very important issue, because they could considerably increase the total impedance of PF. Moreover, the coupling impedance of the IVUs could lead to the beam energy loss, changes in the bunch shape, betatron tune shifts and, finally, to the various beam instabilities. Using the simulation tool (CST Particle Studio), longitudinal and transverse impedances of the IVUs were evaluated and compared to analytical formulas and measurement results. The study provides guidelines for mitigation of unwanted impedance, for an accurate estimate of its effects on the beam quality and beam instabilities and for the impedance budget of a newly designed next-generation machine which has many IVUs and small-aperture beam pipes.

Slides THP1WB02 [2.942 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP1WB02

Export •

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

THP2WD01

Construction and Optimization of Cryogenic Undulators at SOLEIL

ion, undulator, cryogenics, electron

193

M. Valléau, P. Berteaud, F. Briquez, P. Brunelle, N. Béchu, M.-E. Couprie, J. Da Silva Castro, J.M. Dubuisson, A. Ghaith, C. Herbeaux, J. Idam, C.A. Kitegi, F. Lepage, A. Lestrade, M. Louvet, O. Marcouillé, F. Marteau, A. Mary, A. Nadji, L.S. Nadolski, P. Rommeluère, M. Sebdaoui, A. Somogyi, K.T. Tavakoli, M. Tilmont, T. Weitkamp
SOLEIL, Gif-sur-Yvette, France

Funding: Synchrotron SOLEIL, L'Orme des Merisiers, 91 192 BP 34 Gif-sur-Yvette, France,
With permanent magnets undulator operation at cryogenic temperature, the magnetic field and the coercivity can be enhanced, enabling shorter periods with high magnetic fields. The first full scale (2 m long, 18 mm period) hybrid cryogenic undulator [1] using PrFeB [2] magnets operating at 77 K was installed at SOLEIL in 2011. Photon spectra measurements, in good agreement with the ex-pectations from magnetic measurements, were used for precise alignment and taper optimization. The second and third 18 mm PrFeB cryogenic undulators, modified to a half-pole/magnet/half-pole structure, were optimized without any magnet or pole shimming after assembly but mechanical sortings and some geometrical corrections had been done before assembly. A systematic error on individual magnets on the third U18 was also compensated. In-situ measurement benches, including a Hall probe and a stretched wire to optimize the undulator field at room and cryogenic temperature are presented. An upgrade of these in-situ benches will be detailed with the fabrication of a 15 mm 3 m long PrFeB cryogenic undulator at SOLEIL.
[1] C. Benabderrahmane, M. Valléau, M. E. Couprie, Phys. Rev. Accel. Beams 20, 033201(2017)
[2] C. Benabderrahmane, M. Valléau, M. E. Couprie, NIMA 669, 1-6, (2012)

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FLS2018-THP2WD01

Export •

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