MEDSI2016 - List of Keywords (electron)

Paper	Title	Other Keywords	Page
MOPE15	Cam Mover Alignment System Positioning with Wire Position Sensor Feedback for CLIC	ion, target, alignment, controls	32
	J. Kemppinen, Z.S. Kostka, H. Mainaud Durand CERN, Geneva, Switzerland J. Kemppinen ETH, Zurich, Switzerland
	Compact Linear Collider (CLIC) is a study of an electron-positron collider with nominal energy of 3 TeV and luminosity of 2·10³⁴ cm^-2·s^-1. The luminosity goal leads to stringent alignment requirements for single quadrupole magnets. Vertical and lateral offset deviations with regards to a given orbit reference in both ends of a quadrupole shall be below 1 µm and quadrupole roll deviation shall be below 100 µrad. Translation in the direction of particle beam is not controlled but mechanically locked. A parallel kinematic platform based on cam movers was chosen as system for detailed studies. Earlier studies have shown that cam movers can reach the CLIC requirements through an iterative process. The paper presents new modular off-the-shelf control electronics and software including three optional positioning algorithms based on iterations as well as a more advanced algorithm which can reach target position in one movement. The advanced algorithm reads wire position sensors (WPS), calculates quadrupole orientation based on the readings and updates the remaining trajectory during motion. All of the optional positioning methods reach the CLIC positioning requirements within minutes.
	Poster MOPE15 [0.425 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-MOPE15
About •	paper received ※ 09 September 2016 paper accepted ※ 14 September 2016 issue date ※ 22 June 2017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPE31	Dynamic Performance of a Support System for BBA Components in SXFEL	ion, FEL, undulator, quadrupole	80
	F. Gao, R.B. Deng, Y.X. Dong, X. Hu, Z. Jiang, S. Sun, L. Wang, Y.M. Wen SINAP, Shanghai, People’s Republic of China
	The electron beam orbit stability is very important for the Free Electron Laser (FEL) facility. The high beam position stability requirement results in the high position stability for the FEL key components, such as quadruple magnet (Q) and beam position monitor (BPM). This work focus on the research of the dynamic performance of a mechanical support system composed of mechanical supports - including sheets and adjustments - and a granite block mounted on them. It will be applied for the beam based alignment (BBA) Q magnet and BPM for the Soft X-ray FEL project (SXFEL). The Finite-element -FE- calculations of the model characteristics were carried out to guide the subsequent tests. The test results show that the support system can meet the requirement of the SXFEL project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-MOPE31
About •	paper received ※ 09 September 2016 paper accepted ※ 14 September 2016 issue date ※ 22 June 2017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPE38	Progress and Mechanical Engineering of FEL Projects at SINAP	FEL, ion, undulator, linac	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)

TUPE40	Cryo-Ready Undulator U15: Passing SOLEIL’s 2 Meters Threshold in Useful Magnetic Length	ion, undulator, FEL, storage-ring	249
	M. Tilmont, F. Briquez, N. Béchu, L. Chapuis, M.-E. Couprie, J.M. Dubuisson, J.P. Duval, C. Herbeaux, A. Lestrade, J.L. Marlats, M. Sebdaoui, K.T. Tavakoli, C. de Olivera SOLEIL, Gif-sur-Yvette, France
	The U15 is an in-vacuum undulator designed to operate at room temperature and at 70K. It is the first in-vacuum undulator designed, assembled and which will be used in SOLEIL’s storage ring that have support beams for magnets longer than 2 meters. A clear gap is felt in the technologies used for manufacturing and assembling compared to our standard 2m length in-vacuum undulators. This is due, in part, to the tolerances imposed by the maximum phase error admissible in SOLEIL’s storage ring. The poster will shine lights on those difficulties from a design and manufacturing point of view.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE40
About •	paper received ※ 11 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)

WECA06	Mechanical Engineering Solutions for COXINEL Project	ion, undulator, laser, quadrupole	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)

WEPE15	High Frequency UHV Mechanical X-Ray Beam Chopper	ion, vacuum, experiment, controls	339
	N González, C. Colldelram, C. Escudero, S. Ferrer ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	A mechanical chopper* has been designed and built to perform X-ray Absorption Spectroscopy (XAS) experiments with operating liquid electrochemical cells at NAPP end station of ALBA Synchrotron (BL24, CIRCE). When operating the cell, to separate the weak currents induced by the X-ray absorption process at the electrode in contact with the electrolyte (TEY signal) from the faradaic current set between the electrodes, the incoming beam must be chopped at a certain frequency (w). Then, using a lock in amplifier, the signal at this frequency w can be extracted and measured. When the chopper is located in the beam path, it produces pulses with a frequency w, modulating the TEY signal. The chopper developed at ALBA, with variable frequency, improves previous designs which used piezo-actuated choppers constrained to work at fixed oscillating frequencies*. The design consists of a slotted disk that spins around an axis by means of an UHV stepper motor. A LED and photodiode based UHV sensor ensures that frequency drifts do not affect the measurements. The motor is hold by an internally water cooled OFHC support, which allows long duration experiments at high speeds without stopping. Patent Registered ** Velasco-Velez et al, Science 2014, 346, 831-834
	Poster WEPE15 [4.043 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEPE15
About •	paper received ※ 09 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOPE15

Cam Mover Alignment System Positioning with Wire Position Sensor Feedback for CLIC

ion, target, alignment, controls

32

J. Kemppinen, Z.S. Kostka, H. Mainaud Durand
CERN, Geneva, Switzerland
J. Kemppinen
ETH, Zurich, Switzerland

Compact Linear Collider (CLIC) is a study of an electron-positron collider with nominal energy of 3 TeV and luminosity of 2·10³⁴ cm^-2·s^-1. The luminosity goal leads to stringent alignment requirements for single quadrupole magnets. Vertical and lateral offset deviations with regards to a given orbit reference in both ends of a quadrupole shall be below 1 µm and quadrupole roll deviation shall be below 100 µrad. Translation in the direction of particle beam is not controlled but mechanically locked. A parallel kinematic platform based on cam movers was chosen as system for detailed studies. Earlier studies have shown that cam movers can reach the CLIC requirements through an iterative process. The paper presents new modular off-the-shelf control electronics and software including three optional positioning algorithms based on iterations as well as a more advanced algorithm which can reach target position in one movement. The advanced algorithm reads wire position sensors (WPS), calculates quadrupole orientation based on the readings and updates the remaining trajectory during motion. All of the optional positioning methods reach the CLIC positioning requirements within minutes.

Poster MOPE15 [0.425 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-MOPE15

About •

paper received ※ 09 September 2016 paper accepted ※ 14 September 2016 issue date ※ 22 June 2017

Export •

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

MOPE31

Dynamic Performance of a Support System for BBA Components in SXFEL

ion, FEL, undulator, quadrupole

80

F. Gao, R.B. Deng, Y.X. Dong, X. Hu, Z. Jiang, S. Sun, L. Wang, Y.M. Wen
SINAP, Shanghai, People’s Republic of China

The electron beam orbit stability is very important for the Free Electron Laser (FEL) facility. The high beam position stability requirement results in the high position stability for the FEL key components, such as quadruple magnet (Q) and beam position monitor (BPM). This work focus on the research of the dynamic performance of a mechanical support system composed of mechanical supports - including sheets and adjustments - and a granite block mounted on them. It will be applied for the beam based alignment (BBA) Q magnet and BPM for the Soft X-ray FEL project (SXFEL). The Finite-element -FE- calculations of the model characteristics were carried out to guide the subsequent tests. The test results show that the support system can meet the requirement of the SXFEL project.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-MOPE31

About •

paper received ※ 09 September 2016 paper accepted ※ 14 September 2016 issue date ※ 22 June 2017

Export •

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

TUPE38

Progress and Mechanical Engineering of FEL Projects at SINAP

FEL, ion, undulator, linac

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)

TUPE40

Cryo-Ready Undulator U15: Passing SOLEIL’s 2 Meters Threshold in Useful Magnetic Length

ion, undulator, FEL, storage-ring

249

M. Tilmont, F. Briquez, N. Béchu, L. Chapuis, M.-E. Couprie, J.M. Dubuisson, J.P. Duval, C. Herbeaux, A. Lestrade, J.L. Marlats, M. Sebdaoui, K.T. Tavakoli, C. de Olivera
SOLEIL, Gif-sur-Yvette, France

The U15 is an in-vacuum undulator designed to operate at room temperature and at 70K. It is the first in-vacuum undulator designed, assembled and which will be used in SOLEIL’s storage ring that have support beams for magnets longer than 2 meters. A clear gap is felt in the technologies used for manufacturing and assembling compared to our standard 2m length in-vacuum undulators. This is due, in part, to the tolerances imposed by the maximum phase error admissible in SOLEIL’s storage ring. The poster will shine lights on those difficulties from a design and manufacturing point of view.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-TUPE40

About •

paper received ※ 11 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)

WECA06

Mechanical Engineering Solutions for COXINEL Project

ion, undulator, laser, quadrupole

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)

WEPE15

High Frequency UHV Mechanical X-Ray Beam Chopper

ion, vacuum, experiment, controls

339

N González, C. Colldelram, C. Escudero, S. Ferrer
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

A mechanical chopper* has been designed and built to perform X-ray Absorption Spectroscopy (XAS) experiments with operating liquid electrochemical cells at NAPP end station of ALBA Synchrotron (BL24, CIRCE). When operating the cell, to separate the weak currents induced by the X-ray absorption process at the electrode in contact with the electrolyte (TEY signal) from the faradaic current set between the electrodes, the incoming beam must be chopped at a certain frequency (w). Then, using a lock in amplifier, the signal at this frequency w can be extracted and measured. When the chopper is located in the beam path, it produces pulses with a frequency w, modulating the TEY signal. The chopper developed at ALBA, with variable frequency, improves previous designs which used piezo-actuated choppers constrained to work at fixed oscillating frequencies**. The design consists of a slotted disk that spins around an axis by means of an UHV stepper motor. A LED and photodiode based UHV sensor ensures that frequency drifts do not affect the measurements. The motor is hold by an internally water cooled OFHC support, which allows long duration experiments at high speeds without stopping.
* Patent Registered
** Velasco-Velez et al, Science 2014, 346, 831-834

Poster WEPE15 [4.043 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEPE15

About •

paper received ※ 09 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017

Export •

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