MEDSI2016 - Classification: Light Sources / Free Electron Lasers

Paper	Title	Page
MOPE44	Instrumentation and Diagnostics for Bi-Alkali Photocathode Production
	J.R. Nasiatka, J. Feng, H.A. Padmore LBNL, Berkeley, California, USA
	Bi-Alkali photocathodes have been widely used in photo-multiplier tubes and night vision equipment. They have high quantum efficiency (QE) and low thermal emittance in the visible light region, and are of crucial importance to Free Electron Laser (FEL) based light sources. The traditional photocathode production process has not been well defined and performance of cathodes can vary wildly when produced under the same conditions. Advanced tools for characterization of cathode performance during and after fabrication are critical to the understanding of the growth process. We have developed a new deposition and diagnostics system for bi-alkali photocathode production that allows for consistent, repeatable cathode fabrication. This system features active temperature control, a high resolution Ultraviolet monochromator to provide real-time in-situ spectral measurements, and a transverse momentum measuring system (Momentatron) for post fabrication evaluation.
	Poster MOPE44 [8.762 MB]
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TUPE36	Ground Vibration Monitoring for SXFEL Construction at SSRF	242
	R.B. Deng, F. Gao, L. Yin SINAP, Shanghai, People’s Republic of China
	Funding: Project supported by the National Natural Science Foundation of China (Grant No. 11405255) Shanghai X-ray Free Electron Laser test facility (SXFEL) began construction on Dec.30 2014. It is quite important to monitor the ground vibration influenced by the construction at Shanghai Synchrotron Radiation Facility (SSRF), because the SXFEL is just in the north of SSRF and the nearest distance is only 20m. In this paper, the results of ground vibration measurement during the construction period at SSRF experimental hall, tunnel and experimental room near the SXFEL site are shown. Vibrations at different hours, frequency bands and directions are discussed to provide more detailed information on the influence of SXFEL construction to SSRF.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE36
About •	paper received ※ 08 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017
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TUPE37	The European XFEL Photon Beam Transport System
	M. Dommach XFEL. EU, Hamburg, Germany
	European XFEL, the fourth generation Free-Electron-Laser facility in Hamburg (Germany), is going to start user operation in early 2017. In full operation the novel facility will produce at MHz repetition rate coherent femtosecond pulses with unprecedented brilliance in the energy range from 250 eV to 25 keV. The facility comprises of a linear accelerator and three beam-lines: SASE1 and SASE2 that operate in the hard X-ray regime and SASE3 that covers the soft X-ray range up to 3 keV. The installation of the windowless 800-meter long ultra-high vacuum beam transport system of the SASE1 beam-line is almost completed and the assembly of the SASE3 beam-line is ongoing. Challenges of the installation are the implementation of a particle-free assembly of the vacuum system around x-ray mirrors and avoiding particle transport through the beam pipe. The control and interlock system is a custom build Programmable Logic Controller (PLC) to detect a fault vacuum condition and to prevent damage to the beam-line hardware. The poster will report about the installation status and provides an overview of the control system as well as the interlock concepts. * H. Sinn, M. Dommach, X. Dong, D. La Civita, L. Samoylova, R. Villanueva, and F. Yang: Technical Design Report: X-Ray Optics and Beam Transport, XFEL. EU TR-2012-006 (2012)
	Poster TUPE37 [11.315 MB]
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TUPE38	Progress and Mechanical Engineering of FEL Projects at SINAP	246
	L. Yin, W. Fang, X. Hu, S. Sun, L. Wang, L.Y. Yu, W. Zhang SINAP, Shanghai, People’s Republic of China
	Free electron laser (FEL) technology is the next focus at Shanghai Institute of Applied Physics (SINAP). Shanghai Deep Ultraviolet Free-Electron Laser (SDUV-FEL), a test facility for new FEL principles, was operated for 5 years and got a series of important results. Dalian Coherent Light Source (DCLS), a 50~150nm wavelength FEL user facility based on a 300MeV linac located at Dalian Institute of Chemical Physics, started beam commissioning in August. Shanghai X-ray Free-Electron Laser (SXFEL), a soft X-ray FEL test facility based on an 840MeV linac, will be installed in this month and the commissioning is scheduled at the beginning of 2017. The Progress of the FEL projects and the mechanical engineering in the design and construction are presented.
	Poster TUPE38 [8.096 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE38
About •	paper received ※ 07 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WECA06	Mechanical Engineering Solutions for COXINEL Project	299
	K.T. Tavakoli, T. André, I.A. Andriyash, C. Basset, C. Benabderrahmane, P. Berteaud, S. Bobault, S. Bonnin, F. Bouvet, F. Briquez, L. Chapuis, M.-E. Couprie, D. Dennetière, Y. Dietrich, J.P. Duval, M. El Ajjouri, T.K. El Ajjouri, C. Herbeaux, N. Hubert, M. Khojoyan, M. Labat, N. Leclercq, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, A. Mary, P. N’gotta, F. Polack, P. Rommeluère, M. Sebdaoui, F. Thiam, M. Valléau, J. Vétéran, D. Zerbib, C. de Olivera SOLEIL, Gif-sur-Yvette, France J. Gautier, G. Lambert, V. Malka, J.Y. Roussé, K. Ta Phuoc, C. Thaury LOA, Palaiseau, France E. Roussel Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Funding: European Research Council (ERC) advance grant COXINEL (COherent Xray source INferred from Electrons accelerated by Laser) is a European Research Council (ERC) advance grant aims at demonstrating Free Electron Laser amplification at 200 nm with 180 MeV electrons generated by laser plasma acceleration. A special electron beam transfer line with adequate diagnostics has been designed for this project. Strong-focusing variable-field permanent magnet quadrupoles, energy de-mixing chicane and a set of conventional quadrupoles condition the electron beam before its entrance to an In-Vacuum U20 undulator. This presentation describes some of the features incorporated into the design of the magnets, girders, vacuum vessels and diagnostic equipment for this experimental machine. Progress on the equipment preparation and installation is presented as well.
	Slides WECA06 [33.987 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WECA06
About •	paper received ※ 02 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

MOPE44

Instrumentation and Diagnostics for Bi-Alkali Photocathode Production

J.R. Nasiatka, J. Feng, H.A. Padmore
LBNL, Berkeley, California, USA

Bi-Alkali photocathodes have been widely used in photo-multiplier tubes and night vision equipment. They have high quantum efficiency (QE) and low thermal emittance in the visible light region, and are of crucial importance to Free Electron Laser (FEL) based light sources. The traditional photocathode production process has not been well defined and performance of cathodes can vary wildly when produced under the same conditions. Advanced tools for characterization of cathode performance during and after fabrication are critical to the understanding of the growth process. We have developed a new deposition and diagnostics system for bi-alkali photocathode production that allows for consistent, repeatable cathode fabrication. This system features active temperature control, a high resolution Ultraviolet monochromator to provide real-time in-situ spectral measurements, and a transverse momentum measuring system (Momentatron) for post fabrication evaluation.

Poster MOPE44 [8.762 MB]

Export •

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

TUPE36

Ground Vibration Monitoring for SXFEL Construction at SSRF

242

R.B. Deng, F. Gao, L. Yin
SINAP, Shanghai, People’s Republic of China

Funding: Project supported by the National Natural Science Foundation of China (Grant No. 11405255)
Shanghai X-ray Free Electron Laser test facility (SXFEL) began construction on Dec.30 2014. It is quite important to monitor the ground vibration influenced by the construction at Shanghai Synchrotron Radiation Facility (SSRF), because the SXFEL is just in the north of SSRF and the nearest distance is only 20m. In this paper, the results of ground vibration measurement during the construction period at SSRF experimental hall, tunnel and experimental room near the SXFEL site are shown. Vibrations at different hours, frequency bands and directions are discussed to provide more detailed information on the influence of SXFEL construction to SSRF.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE36

About •

paper received ※ 08 September 2016 paper accepted ※ 21 September 2016 issue date ※ 22 June 2017

Export •

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

TUPE37

The European XFEL Photon Beam Transport System

M. Dommach
XFEL. EU, Hamburg, Germany

European XFEL, the fourth generation Free-Electron-Laser facility in Hamburg (Germany), is going to start user operation in early 2017. In full operation the novel facility will produce at MHz repetition rate coherent femtosecond pulses with unprecedented brilliance in the energy range from 250 eV to 25 keV. The facility comprises of a linear accelerator and three beam-lines: SASE1 and SASE2 that operate in the hard X-ray regime and SASE3 that covers the soft X-ray range up to 3 keV. The installation of the windowless 800-meter long ultra-high vacuum beam transport system of the SASE1 beam-line is almost completed and the assembly of the SASE3 beam-line is ongoing. Challenges of the installation are the implementation of a particle-free assembly of the vacuum system around x-ray mirrors and avoiding particle transport through the beam pipe. The control and interlock system is a custom build Programmable Logic Controller (PLC) to detect a fault vacuum condition and to prevent damage to the beam-line hardware. The poster will report about the installation status and provides an overview of the control system as well as the interlock concepts.
* H. Sinn, M. Dommach, X. Dong, D. La Civita, L. Samoylova, R. Villanueva, and F. Yang: Technical Design Report: X-Ray Optics and Beam Transport, XFEL. EU TR-2012-006 (2012)

Poster TUPE37 [11.315 MB]

Export •

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

TUPE38

Progress and Mechanical Engineering of FEL Projects at SINAP

246

L. Yin, W. Fang, X. Hu, S. Sun, L. Wang, L.Y. Yu, W. Zhang
SINAP, Shanghai, People’s Republic of China

Free electron laser (FEL) technology is the next focus at Shanghai Institute of Applied Physics (SINAP). Shanghai Deep Ultraviolet Free-Electron Laser (SDUV-FEL), a test facility for new FEL principles, was operated for 5 years and got a series of important results. Dalian Coherent Light Source (DCLS), a 50~150nm wavelength FEL user facility based on a 300MeV linac located at Dalian Institute of Chemical Physics, started beam commissioning in August. Shanghai X-ray Free-Electron Laser (SXFEL), a soft X-ray FEL test facility based on an 840MeV linac, will be installed in this month and the commissioning is scheduled at the beginning of 2017. The Progress of the FEL projects and the mechanical engineering in the design and construction are presented.

Poster TUPE38 [8.096 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE38

About •

paper received ※ 07 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

Export •

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

WECA06

Mechanical Engineering Solutions for COXINEL Project

299

K.T. Tavakoli, T. André, I.A. Andriyash, C. Basset, C. Benabderrahmane, P. Berteaud, S. Bobault, S. Bonnin, F. Bouvet, F. Briquez, L. Chapuis, M.-E. Couprie, D. Dennetière, Y. Dietrich, J.P. Duval, M. El Ajjouri, T.K. El Ajjouri, C. Herbeaux, N. Hubert, M. Khojoyan, M. Labat, N. Leclercq, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, A. Mary, P. N’gotta, F. Polack, P. Rommeluère, M. Sebdaoui, F. Thiam, M. Valléau, J. Vétéran, D. Zerbib, C. de Olivera
SOLEIL, Gif-sur-Yvette, France
J. Gautier, G. Lambert, V. Malka, J.Y. Roussé, K. Ta Phuoc, C. Thaury
LOA, Palaiseau, France
E. Roussel
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Funding: European Research Council (ERC) advance grant
COXINEL (COherent Xray source INferred from Electrons accelerated by Laser) is a European Research Council (ERC) advance grant aims at demonstrating Free Electron Laser amplification at 200 nm with 180 MeV electrons generated by laser plasma acceleration. A special electron beam transfer line with adequate diagnostics has been designed for this project. Strong-focusing variable-field permanent magnet quadrupoles, energy de-mixing chicane and a set of conventional quadrupoles condition the electron beam before its entrance to an In-Vacuum U20 undulator. This presentation describes some of the features incorporated into the design of the magnets, girders, vacuum vessels and diagnostic equipment for this experimental machine. Progress on the equipment preparation and installation is presented as well.

Slides WECA06 [33.987 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WECA06

About •

paper received ※ 02 September 2016 paper accepted ※ 15 September 2016 issue date ※ 22 June 2017

Export •

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