FEL2015 - List of Keywords (vacuum)

Paper	Title	Other Keywords	Page
MOP050	Development of Coherent Terahertz Wave Sources using LEBRA and KU-FEL S-band Linacs	FEL, electron, radiation, synchrotron-radiation	143
	N. Sei, H. Ogawa AIST, Tsukuba, Ibaraki, Japan K. Hayakawa, Y. Hayakawa, M. Inagaki, K. Nakao, K. Nogami, T. Sakai, T. Tanaka LEBRA, Funabashi, Japan H. Ohgaki, H. Zen Kyoto University, Kyoto, Japan
	Funding: This work is supported by the "ZE Research Program, IAE ZE27B-6". In an infrared free-electron laser (FEL) facility using an S-band linac, a short-bunched electron beam is required to obtain a high FEL gain. Generally, the bunch length of the electron beam is compressed to 1 ps or less before interaction with the photons accumulated in the FEL resonator. This suggests that the electron beam dedicated to the FEL oscillation is suitable for generation of high-peak-power coherent radiation in terahertz (THz) wave region. Using the compressed electron beams, the coherent THz-wave sources have been developed at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University and Kyoto University Free Electron Laser (KU-FEL). The observed powers have been higher than 100 micro-joule per macropulse. In this presentation, the properties of the high-power coherent THz waves generated at the bending magnets will be reported. N. Sei et al., J. Opt. Soc. Am. B 31 (2014) 2150.
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TUP038	Construction of the EU-XFEL Laser Heater	laser, undulator, electron, ion	452
	M. Hamberg, V.G. Ziemann Uppsala University, Uppsala, Sweden
	Funding: We thank the Swedish research council under Project number DNR-828-2008-1093 for financial support. Installation of the laser heater for the EU-XFEL is completed and first commissioning runs are imminent. We discuss the installation of the key elements and provide an outlook of the commissioning phase.
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TUP055	Technical Overview of Bunch Compressor System for PAL XFEL	dipole, quadrupole, electron, diagnostics	490
	H.-G. Lee, Y.-G. Jung, H.-S. Kang, D.E. Kim, K.W. Kim, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh, Y.J. Suh PAL, Pohang, Kyungbuk, Republic of Korea
	Pohang Accelerator Laboratory(PAL) is developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. Bunch compressor (BC) systems are developed to be used for the linear accelerator tunnel. It consists of three(BC1, BC2, BC3_H) hard X-ray line and one(BC3_S) soft X-ray line. BC systems are composed of four dipole magnets, three quadrupole magnet, BPM and collimator. The support system is based on an asymmetric four-dipole magnet chicane in which asymmetry and variable R56. can be optimized. This flexibility is achieved by allowing the middle two dipole magnets to move transversely. In this paper, we describe the design of the stages used for precise movement of the bunch compressor magnets and associated diagnostics components.
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TUP067	Effect of Hot Ions in LCLC-II	ion, electron, linac, simulation	508
	L. Wang, T.O. Raubenheimer SLAC, Menlo Park, California, USA
	The ions in a linac, such as ERL, draw more attention recently. LCLSII has a long linac with 1MHz repetition rate. The ions, in general, are not deeply trapped due to the long bunch spacing. The effect of ion thermal energy becomes important in this regime. The beam dynamics with ions are studied numerically. There is a linear growth in amplitude, but not exponential growth as traditional fast ion instability. This instability set a maximum bunch-train length to limit the beam amplitude to fractional beam σ. Theoretical works are also done to compare the simulations. We also extend our works to different regimes where the motions of ions from stable to unstable.
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WEA03	SwissFEL Status Report	undulator, linac, FEL, electron	567
	R. Ganter PSI, Villigen PSI, Switzerland
	SwissFEL is a 5.8 GeV linac which sends electron bunches at 100 Hz into a 60 m long in-vacuum undulator line to produce hard X-rays between 0.1 nm and 0.7 nm. The SwissFEL accelerator design is based on a low emittance beam with tight tolerances on RF stability. The first lasing of SwissFEL is planned for early 2017 and two end-stations should then be brought into operation in the same year. The delivery of the SwissFEL building to PSI is planned for fall this year, but some rooms are already completed and currently in use for components assembly. The production of the C-band RF accelerating structures has now reach the nominal rate of 5 structures/month. Two different RF solid state modulator prototypes could demonstrate jitter lower than 20 ppm but stability and reliability tests are still going on. The undulators assembly and measurement sequence have started and 13 undulators are planned to be ready in the tunnel by October 2016. Large series of components like magnets, vacuum systems and mechanical supports are already in house and under assembly. Photonics components for two beamlines and two end stations are ordered and planned to be ready for 2017.
	Slides WEA03 [36.505 MB]
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WEP038	Production Status of Accelerator Components	network, status, LLRF, linac	658
	N. Shigeoka, M. Kimura, S. Miura, K. Okihira MHI, Hiroshima, Japan
	Mitsubishi Heavy Industries, LTD. (MHI) has been delivered various kind of accelerator components to multiple FEL facilities. Recently we completed production of S-band accelerating structures for PAL-XFEL. Currently we are manufacturing C-band waveguide network for SwissFEL. Production status and result of above-mentioned products will be presented in the presentation.
	Poster WEP038 [2.189 MB]
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WED03	Photon Diagnostics and Photon Beamlines Installations at the European XFEL	diagnostics, photon, beam-transport, radiation	764
	J. Grünert, B. Baranasic, J. Buck, F. Dietrich, M. Dommach, W. Freund, A. Koch, N.G. Kujala, J. Liu, S. Molodtsov, M. Planas, H. Sinn XFEL. EU, Hamburg, Germany
	The European X-ray Free-Electron-Laser (XFEL. EU) is a new a 4th generation light facility which will deliver radiation with femtosecond and sub-Ångström resolution at MHz repetition rates, and is currently under construction in the Hamburg metropolitan area in Germany. Special diagnostics [1,2] for spontaneous radiation analysis is required to tune towards the lasing condition. Once lasing is achieved, diagnostic imagers [3], online monitors [4], and the photon beam transport system [5] need to cope with extreme radiation intensities. In 2015 the installation of machine equipment in the photon area of the facility is in full swing. This contribution presents the progress on final assemblies of photon diagnostics, the installation status of these devices as well as of the beam transport system, and recent design developments for diagnostic spectrometers and temporal diagnostics. [1] J. Grünert, XFEL. EU TR-2012-003(2012) [2] W. Freund, XFEL. EU TN-2014-001-01(2014) [3] A. Koch, Proc. SPIE 95121R(2015) [4] J. Buck et al., Proc. SPIE 85040U(2012) [5] H. Sinn et al., XFEL. EU TR-2012-006(2012)
	Slides WED03 [14.557 MB]
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Paper

Title

Other Keywords

Page

MOP050

Development of Coherent Terahertz Wave Sources using LEBRA and KU-FEL S-band Linacs

FEL, electron, radiation, synchrotron-radiation

143

N. Sei, H. Ogawa
AIST, Tsukuba, Ibaraki, Japan
K. Hayakawa, Y. Hayakawa, M. Inagaki, K. Nakao, K. Nogami, T. Sakai, T. Tanaka
LEBRA, Funabashi, Japan
H. Ohgaki, H. Zen
Kyoto University, Kyoto, Japan

Funding: This work is supported by the "ZE Research Program, IAE ZE27B-6".
In an infrared free-electron laser (FEL) facility using an S-band linac, a short-bunched electron beam is required to obtain a high FEL gain. Generally, the bunch length of the electron beam is compressed to 1 ps or less before interaction with the photons accumulated in the FEL resonator. This suggests that the electron beam dedicated to the FEL oscillation is suitable for generation of high-peak-power coherent radiation in terahertz (THz) wave region. Using the compressed electron beams, the coherent THz-wave sources have been developed at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University and Kyoto University Free Electron Laser (KU-FEL). The observed powers have been higher than 100 micro-joule per macropulse*. In this presentation, the properties of the high-power coherent THz waves generated at the bending magnets will be reported.
* N. Sei et al., J. Opt. Soc. Am. B 31 (2014) 2150.

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TUP038

Construction of the EU-XFEL Laser Heater

laser, undulator, electron, ion

452

M. Hamberg, V.G. Ziemann
Uppsala University, Uppsala, Sweden

Funding: We thank the Swedish research council under Project number DNR-828-2008-1093 for financial support.
Installation of the laser heater for the EU-XFEL is completed and first commissioning runs are imminent. We discuss the installation of the key elements and provide an outlook of the commissioning phase.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

TUP055

Technical Overview of Bunch Compressor System for PAL XFEL

dipole, quadrupole, electron, diagnostics

490

H.-G. Lee, Y.-G. Jung, H.-S. Kang, D.E. Kim, K.W. Kim, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh, Y.J. Suh
PAL, Pohang, Kyungbuk, Republic of Korea

Pohang Accelerator Laboratory(PAL) is developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. Bunch compressor (BC) systems are developed to be used for the linear accelerator tunnel. It consists of three(BC1, BC2, BC3_H) hard X-ray line and one(BC3_S) soft X-ray line. BC systems are composed of four dipole magnets, three quadrupole magnet, BPM and collimator. The support system is based on an asymmetric four-dipole magnet chicane in which asymmetry and variable R56. can be optimized. This flexibility is achieved by allowing the middle two dipole magnets to move transversely. In this paper, we describe the design of the stages used for precise movement of the bunch compressor magnets and associated diagnostics components.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

TUP067

Effect of Hot Ions in LCLC-II

ion, electron, linac, simulation

508

L. Wang, T.O. Raubenheimer
SLAC, Menlo Park, California, USA

The ions in a linac, such as ERL, draw more attention recently. LCLSII has a long linac with 1MHz repetition rate. The ions, in general, are not deeply trapped due to the long bunch spacing. The effect of ion thermal energy becomes important in this regime. The beam dynamics with ions are studied numerically. There is a linear growth in amplitude, but not exponential growth as traditional fast ion instability. This instability set a maximum bunch-train length to limit the beam amplitude to fractional beam σ. Theoretical works are also done to compare the simulations. We also extend our works to different regimes where the motions of ions from stable to unstable.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

WEA03

SwissFEL Status Report

undulator, linac, FEL, electron

567

R. Ganter
PSI, Villigen PSI, Switzerland

SwissFEL is a 5.8 GeV linac which sends electron bunches at 100 Hz into a 60 m long in-vacuum undulator line to produce hard X-rays between 0.1 nm and 0.7 nm. The SwissFEL accelerator design is based on a low emittance beam with tight tolerances on RF stability. The first lasing of SwissFEL is planned for early 2017 and two end-stations should then be brought into operation in the same year. The delivery of the SwissFEL building to PSI is planned for fall this year, but some rooms are already completed and currently in use for components assembly. The production of the C-band RF accelerating structures has now reach the nominal rate of 5 structures/month. Two different RF solid state modulator prototypes could demonstrate jitter lower than 20 ppm but stability and reliability tests are still going on. The undulators assembly and measurement sequence have started and 13 undulators are planned to be ready in the tunnel by October 2016. Large series of components like magnets, vacuum systems and mechanical supports are already in house and under assembly. Photonics components for two beamlines and two end stations are ordered and planned to be ready for 2017.

Slides WEA03 [36.505 MB]

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WEP038

Production Status of Accelerator Components

network, status, LLRF, linac

658

N. Shigeoka, M. Kimura, S. Miura, K. Okihira
MHI, Hiroshima, Japan

Mitsubishi Heavy Industries, LTD. (MHI) has been delivered various kind of accelerator components to multiple FEL facilities. Recently we completed production of S-band accelerating structures for PAL-XFEL. Currently we are manufacturing C-band waveguide network for SwissFEL. Production status and result of above-mentioned products will be presented in the presentation.

Poster WEP038 [2.189 MB]

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WED03

Photon Diagnostics and Photon Beamlines Installations at the European XFEL

diagnostics, photon, beam-transport, radiation

764

J. Grünert, B. Baranasic, J. Buck, F. Dietrich, M. Dommach, W. Freund, A. Koch, N.G. Kujala, J. Liu, S. Molodtsov, M. Planas, H. Sinn
XFEL. EU, Hamburg, Germany

The European X-ray Free-Electron-Laser (XFEL. EU) is a new a 4th generation light facility which will deliver radiation with femtosecond and sub-Ångström resolution at MHz repetition rates, and is currently under construction in the Hamburg metropolitan area in Germany. Special diagnostics [1,2] for spontaneous radiation analysis is required to tune towards the lasing condition. Once lasing is achieved, diagnostic imagers [3], online monitors [4], and the photon beam transport system [5] need to cope with extreme radiation intensities. In 2015 the installation of machine equipment in the photon area of the facility is in full swing. This contribution presents the progress on final assemblies of photon diagnostics, the installation status of these devices as well as of the beam transport system, and recent design developments for diagnostic spectrometers and temporal diagnostics.
[1] J. Grünert, XFEL. EU TR-2012-003(2012)
[2] W. Freund, XFEL. EU TN-2014-001-01(2014)
[3] A. Koch, Proc. SPIE 95121R(2015)
[4] J. Buck et al., Proc. SPIE 85040U(2012)
[5] H. Sinn et al., XFEL. EU TR-2012-006(2012)

Slides WED03 [14.557 MB]

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