FLS2018 - List of Keywords (undulator)

Paper	Title	Other Keywords	Page
MOA2PL03	Review of New Developments in Superconducting Undulator Technology at the APS	ion, FEL, storage-ring, 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]
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MOP1WB01	Lattice Design for PETRA IV: Towards a Diffraction-Limited Storage Ring	ion, lattice, emittance, dynamic-aperture	12
	I.V. Agapov, R. Brinkmann, Y.-C. Chae, X.N. Gavaldà, J. Keil, R. Wanzenberg DESY, Hamburg, Germany
	Machine design for the PETRA III storage ring upgrade – PETRA IV – aiming at a 10-30 pm emittance range has been ongoing at DESY. We present the design challenges and approaches for this machine, the baseline lattice and the alternative lattice concepts currently under consideration.
	Slides MOP1WB01 [3.259 MB]
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TUA2WC01	Transportation and Manipulation of a Laser Plasma Acceleration Beam	ion, electron, laser, plasma	56
	A. Ghaith, T. André, I.A. Andriyash, F. Blache, F. Bouvet, F. Briquez, M.-E. Couprie, Y. Dietrich, J.P. Duval, C. Herbeaux, N. Hubert, C.A. Kitegi, M. Labat, N. Leclercq, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, D. Oumbarek, P. Rommeluère, E. Roussel, M. Sebdaoui, K.T. Tavakoli, M. Valléau SOLEIL, Gif-sur-Yvette, France S. Bielawski, C. Evain, C. Szwaj PhLAM/CERLA, Villeneuve d'Ascq, France S. Corde, J. Gautier, G. Lambert, B. Mahieu, V. Malka, K.T. Phuoc, C. Thaury LOA, Palaiseau, France
	Funding: European Research Council advanced grant COXINEL - 340015 The ERC Advanced Grant COXINEL aims at demonstrating free electron laser amplification, at a resonant wavelength of 200 nm, based on a laser plasma acceleration source. To achieve the amplification, a 10 m long dedicated transport line was designed to manipulate the beam qualities. It starts with a triplet of permanent magnet with tunable gradient quadrupoles (QUAPEVA) that handles the highly divergent electron beam, a demixing chicane with a slit to reduce the energy spread per slice, and a set of electromagnetic quadrupoles to provide a chromatic focusing in a 2 m long cryogenic undulator. Electrons of energy 176 MeV were successfully transported throughout the line, where the beam positioning and dispersion were controlled efficiently thanks to a specific beam based alignment method, as well as the energy range by varying the slit width. Observations of undulator radiation for different undulator gaps are reported.
	Slides TUA2WC01 [2.465 MB]
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TUA2WC02	"LWFA-driven" Free Electron Laser for ELI-Beamlines	ion, electron, FEL, photon	62
	A.Y. Molodozhentsev, G. Korn, L. Pribyl Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic A.R. Maier University of Hamburg, Hamburg, Germany
	Free-electron lasers (FEL) are unique light source for different applications on the femto-second scale, including for instance the most basic reaction mechanisms in chemistry, structural biology and condense physics. Laser wake field acceleration (LWFA) mechanism allow to produce extremely short electron bunches of a few fs length with the energy up to a few GeV providing peak current of many kA in extremely compact geometries. This novel acceleration method therefore opens a new way to develop compact "laser-based" FELs. ELI beamlines is an international user facility for fundamental and applied research using ultra-intense lasers and ultra-short high-energy electron beams. In frame of this report we present conceptual solutions for an compact "LFWA" based soft X-ray FEL, which can deliver a photon peak brightness of 10³¹ ph/sec/mm²/mrad²/0.1%bw. A combination of this achievement with novel laser technologies will open a new perspective for the development of extremely compact FELs with few or even sub-femtosecond photon bunches for a very wide user community.
	Slides TUA2WC02 [3.882 MB]
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TUP2WA03	Harmonic Lasing in X-Ray FELs: Theory and Experiment	ion, FEL, electron, radiation	68
	E. Schneidmiller, B. Faatz, M. Kuhlmann, J. Rönsch-Schulenburg, S. Schreiber, M. Tischer, M.V. Yurkov DESY, Hamburg, Germany
	Harmonic lasing in XFELs is an opportunity to extend operating range of existing and planned X-ray FEL user facilities. Contrary to nonlinear harmonic generation, harmonic lasing can provide much more intense, stable, and narrow-band FEL beam which is easier to handle due to the suppressed fundamental. Another interesting application of harmonic lasing is Harmonic Lasing Self-Seeded (HLSS) FEL, that allows to improve longitudinal coherence and spectral power of a SASE FEL. Recently* this concept was successfully tested at FLASH2 in the range 4.5 - 15 nm. That was also the first experimental demonstration of harmonic lasing in a high-gain FEL and at a short wavelength (before it worked only in infrared FEL oscillators). In this contribution we describe the concepts of harmonic lasing and of HLSS FEL, and present the experimental results from FLASH2. * E.Schneidmiller and M.Yurkov, Phys. Rev. ST-AB 15(2012)080702 E.Schneidmiller and M.Yurkov, Proc. of FEL2013, p.700 * E.Schneidmiller et al., Phys. Rev. Accel. Beams 20(2017)020705
	Slides TUP2WA03 [3.378 MB]
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WEA1PL02	Dielectric Accelerators and Other Non-Plasma Accelerator Based Compact Light Sources	ion, laser, electron, radiation	74
	R.J. England, Z. Huang SLAC, Menlo Park, California, USA
	Funding: U.S. Department of Energy DE-AC02-76SF00515; Gordon and Betty Moore Foundation GBMF4744 We review recent experimental progress in developing nanofabricated dielectric laser-driven accelerators and discuss the possibility of utilizing the unique sub-femtosecond electron pulse format these accelerators would provide to create ultra-compact EUV and X-ray radiation sources.
	Slides WEA1PL02 [16.828 MB]
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WEP1WC02	CompactLight Design Study	ion, electron, FEL, gun	85
	A. Latina, D. Schulte, S. Stapnes, W. Wuensch CERN, Geneva, Switzerland M. Aicheler HIP, University of Helsinki, Finland A.A. Aksoy Ankara University Institute of Accelerator Technologies, Golbasi, Turkey A. Bernhard KIT, Karlsruhe, Germany J.A. Clarke STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom A.W. Cross USTRAT/SUPA, Glasgow, United Kingdom G. D'Auria, R. Geometrante Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy R.T. Dowd AS - ANSTO, Clayton, Australia D. Esperante Pereira IFIC, Valencia, Spain W. Fang SINAP, Shanghai, People's Republic of China A. Faus-Golfe LAL, Orsay, France M. Ferrario INFN/LNF, Frascati (Roma), Italy E.N. Gazis National Technical University of Athens, Athens, Greece R. Geometrante KYMA, Trieste, Italy M. Jacewicz Uppsala University, Uppsala, Sweden A. Mostacci Sapienza University of Rome, Rome, Italy F. Nguyen ENEA C.R. Frascati, Frascati (Roma), Italy F. Pérez ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain J.M.A. Priem VDL ETG, Eindhoven, The Netherlands T. Schmidt PSI, Villigen PSI, Switzerland
	H2020 CompactLight Project aims at designing the next generation of compact hard X-Rays Free-Electron Lasers, relying on very high accelerating gradients and on novel undulator concepts. CompactLight intends to design a compact Hard X-ray FEL facility based on very high-gradient acceleration in the X band of frequencies, on a very bright photo injector, and on short-period/superconductive undulators to enable smaller electron beam energy. If compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, be significantly more compact, as a consequence both of the lower energy and of the high-gradient X-band structures, have lower electrical power demand and a smaller footprint. CompactLight is a consortium of 24 institutes (21 European + 3 extra Europeans), gathering the world-leading experts both in the domains of X-band acceleration and undulator design.
	Slides WEP1WC02 [12.831 MB]
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WEA2WD03	Analysis of Electron Trajectories in Harmonic Undulator with SCILAB's Model Based Design Codes	ion, simulation, electron, FEL	93
	H. Jeevakhan, S. Kumar NITTTR, Bhopal, India G. Mishra Devi Ahilya University, Indore, India
	Scilab's X-cos model-based simulation blocks has been used to simulate the trajectories of an electron traversing through an Harmonic undulator. The trajectory of electron along X and Y directions has been simulated from Numerical and analytical methods. Analysis given in the present paper is compared with the other codes. Parallel simulation of Harmonic undulator magnetic field along with trajectories of electron is given in the present analysis.
	Slides WEA2WD03 [0.652 MB]
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WEA2WD04	Harmonic Undulator Radiation with Dual Non Periodic Magnetic Components	ion, electron, radiation, FEL	98
	H. Jeevakhan NITTTR, Bhopal, India G. Mishra Devi Ahilya University, Indore, India
	Undulator radiation at third harmonics generated by harmonic undulator in the presence dual non periodic constant magnetic field. Electron trajectories along the x and y direction has been determined analytical and numerical methods. Generalized Bessel function is used to determine the intensity of radiation and Simpson's numerical method of integration is used to find the effect of constant magnetic fields. Comparison with previous analysis has also been presented.
	Slides WEA2WD04 [1.050 MB]
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WEP2PT003	Undulator Phase Matching for the the European XFEL	ion, FEL, electron, radiation	103
	Y. Li, J. Pflüger XFEL. EU, Hamburg, Germany
	The undulator system in the European XFEL is mainly comprised 5-m long undulator segments and 1.1 m long intersections in between. In intersections the electron velocity is faster than it inside an undulator and the optical phase is detuned. The detune effect is also from the undulator fringe field where electron longitudinal speed also deviates from the oscillation condition. The total detune effect is compensated by a magnetic device called phase shifter, which is correspondingly set for a specific undulator gap. In this paper we introduce the method to set the phase shifter gap for each K parameter according to the measured magnetic field.
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WEP2PT022	PHASE SHIFTER APPLICATION IN DOUBLE UNDULATOR CONFIGURATION OF HEPS	ion, brilliance, radiation, electron	120
	X.Y. Li, Y. Jiao, S.K. Tian IHEP, Beijing, People's Republic of China
	For over 6 meters long straight-section of HEPS, collinear double-cryogenic permanent magnet undulator(CPMU) is designed for high energy photon users to achieve higher brightness. Angular and spatial profiles of radiation produced by the double undulator configuration have been derived analytically. The efficiency of phase shifter on improving the brightness of double-CPMU is therefore evaluated with the beam energy spread and emittance are taken into account. Optimized beta-functions of electron beam are obtained.
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WEP2PT030	Undulator Development Activities at DAVV-Indore	ion, radiation, synchrotron, synchrotron-radiation	133
	M. Gehlot, R. Khullar, G. Mishra Devi Ahilya University, Indore, India H. Jeevakhan NITTTR, Bhopal, India G. Sharma RI Research Instruments GmbH, Bergisch Gladbach, Germany
	Insertion Device Design Laboratory, DAVV has development activities on in-house design, fabrication and measurement of prototype undulators for synchrotron radiation and free electron laser application. The first prototype U50 was built with six periods, 50mm each period. It was PPM type. The next prototype U20 hybrid device based on NdFeB-Cobalt steel was built with aim to produce 0.24T to 0.05T in 10-20mm gap. The undulator is a 20mm period and there are 25 periods. The next one is U50-II PPM structure with 20 periods. In this paper we review the designs of all these undulators and briefly outline the user facilities of Hall probe bench, Pulsed wire bench and stretched wire magnetic measurement systems at IDDL.
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WEP2PT033	Conceptual Design of Superconducting Transverse Gradient Undulator for PAL-XFEL Beamline	ion, FEL, operation, electron	142
	S.J. Lee, J.H. Han PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT \& Future Planning(2017R1C1B1012852) Recently, the transverse gradient undulator (TGU) applications are suggested from the laser plasma wake-field accelerator (LPWA) to ultimate storage ring (USR). Especially for X-ray FEL, TGU can be used to generate the large bandwidth radiation (up to §I10{\percent}). In this proceeding, the review of PAL-XFEL beam parameters and TGU requirements was done to apply a variable large bandwidth operation to the PAL-XFEL beamlines. Also, the conceptual design of TGU, based on superconducting undulator (SCU) was proposed, and B-field calculation results were introduced for PAL-XFEL large bandwidth operation mode.
	Poster WEP2PT033 [0.927 MB]
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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, vacuum	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]
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THP2WD01	Construction and Optimization of Cryogenic Undulators at SOLEIL	ion, cryogenics, vacuum, 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)
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Paper

Title

Other Keywords

Page

MOA2PL03

Review of New Developments in Superconducting Undulator Technology at the APS

ion, FEL, storage-ring, 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]

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MOP1WB01

Lattice Design for PETRA IV: Towards a Diffraction-Limited Storage Ring

ion, lattice, emittance, dynamic-aperture

12

I.V. Agapov, R. Brinkmann, Y.-C. Chae, X.N. Gavaldà, J. Keil, R. Wanzenberg
DESY, Hamburg, Germany

Machine design for the PETRA III storage ring upgrade – PETRA IV – aiming at a 10-30 pm emittance range has been ongoing at DESY. We present the design challenges and approaches for this machine, the baseline lattice and the alternative lattice concepts currently under consideration.

Slides MOP1WB01 [3.259 MB]

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TUA2WC01

Transportation and Manipulation of a Laser Plasma Acceleration Beam

ion, electron, laser, plasma

56

A. Ghaith, T. André, I.A. Andriyash, F. Blache, F. Bouvet, F. Briquez, M.-E. Couprie, Y. Dietrich, J.P. Duval, C. Herbeaux, N. Hubert, C.A. Kitegi, M. Labat, N. Leclercq, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, D. Oumbarek, P. Rommeluère, E. Roussel, M. Sebdaoui, K.T. Tavakoli, M. Valléau
SOLEIL, Gif-sur-Yvette, France
S. Bielawski, C. Evain, C. Szwaj
PhLAM/CERLA, Villeneuve d'Ascq, France
S. Corde, J. Gautier, G. Lambert, B. Mahieu, V. Malka, K.T. Phuoc, C. Thaury
LOA, Palaiseau, France

Funding: European Research Council advanced grant COXINEL - 340015
The ERC Advanced Grant COXINEL aims at demonstrating free electron laser amplification, at a resonant wavelength of 200 nm, based on a laser plasma acceleration source. To achieve the amplification, a 10 m long dedicated transport line was designed to manipulate the beam qualities. It starts with a triplet of permanent magnet with tunable gradient quadrupoles (QUAPEVA) that handles the highly divergent electron beam, a demixing chicane with a slit to reduce the energy spread per slice, and a set of electromagnetic quadrupoles to provide a chromatic focusing in a 2 m long cryogenic undulator. Electrons of energy 176 MeV were successfully transported throughout the line, where the beam positioning and dispersion were controlled efficiently thanks to a specific beam based alignment method, as well as the energy range by varying the slit width. Observations of undulator radiation for different undulator gaps are reported.

Slides TUA2WC01 [2.465 MB]

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TUA2WC02

"LWFA-driven" Free Electron Laser for ELI-Beamlines

ion, electron, FEL, photon

62

A.Y. Molodozhentsev, G. Korn, L. Pribyl
Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic
A.R. Maier
University of Hamburg, Hamburg, Germany

Free-electron lasers (FEL) are unique light source for different applications on the femto-second scale, including for instance the most basic reaction mechanisms in chemistry, structural biology and condense physics. Laser wake field acceleration (LWFA) mechanism allow to produce extremely short electron bunches of a few fs length with the energy up to a few GeV providing peak current of many kA in extremely compact geometries. This novel acceleration method therefore opens a new way to develop compact "laser-based" FELs. ELI beamlines is an international user facility for fundamental and applied research using ultra-intense lasers and ultra-short high-energy electron beams. In frame of this report we present conceptual solutions for an compact "LFWA" based soft X-ray FEL, which can deliver a photon peak brightness of 10³¹ ph/sec/mm²/mrad²/0.1%bw. A combination of this achievement with novel laser technologies will open a new perspective for the development of extremely compact FELs with few or even sub-femtosecond photon bunches for a very wide user community.

Slides TUA2WC02 [3.882 MB]

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TUP2WA03

Harmonic Lasing in X-Ray FELs: Theory and Experiment

ion, FEL, electron, radiation

68

E. Schneidmiller, B. Faatz, M. Kuhlmann, J. Rönsch-Schulenburg, S. Schreiber, M. Tischer, M.V. Yurkov
DESY, Hamburg, Germany

Harmonic lasing in XFELs is an opportunity to extend operating range of existing and planned X-ray FEL user facilities*. Contrary to nonlinear harmonic generation, harmonic lasing can provide much more intense, stable, and narrow-band FEL beam which is easier to handle due to the suppressed fundamental. Another interesting application of harmonic lasing is Harmonic Lasing Self-Seeded (HLSS) FEL*,** that allows to improve longitudinal coherence and spectral power of a SASE FEL. Recently*** this concept was successfully tested at FLASH2 in the range 4.5 - 15 nm. That was also the first experimental demonstration of harmonic lasing in a high-gain FEL and at a short wavelength (before it worked only in infrared FEL oscillators). In this contribution we describe the concepts of harmonic lasing and of HLSS FEL, and present the experimental results from FLASH2.
* E.Schneidmiller and M.Yurkov, Phys. Rev. ST-AB 15(2012)080702
** E.Schneidmiller and M.Yurkov, Proc. of FEL2013, p.700
*** E.Schneidmiller et al., Phys. Rev. Accel. Beams 20(2017)020705

Slides TUP2WA03 [3.378 MB]

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WEA1PL02

Dielectric Accelerators and Other Non-Plasma Accelerator Based Compact Light Sources

ion, laser, electron, radiation

74

R.J. England, Z. Huang
SLAC, Menlo Park, California, USA

Funding: U.S. Department of Energy DE-AC02-76SF00515; Gordon and Betty Moore Foundation GBMF4744
We review recent experimental progress in developing nanofabricated dielectric laser-driven accelerators and discuss the possibility of utilizing the unique sub-femtosecond electron pulse format these accelerators would provide to create ultra-compact EUV and X-ray radiation sources.

Slides WEA1PL02 [16.828 MB]

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WEP1WC02

CompactLight Design Study

ion, electron, FEL, gun

85

A. Latina, D. Schulte, S. Stapnes, W. Wuensch
CERN, Geneva, Switzerland
M. Aicheler
HIP, University of Helsinki, Finland
A.A. Aksoy
Ankara University Institute of Accelerator Technologies, Golbasi, Turkey
A. Bernhard
KIT, Karlsruhe, Germany
J.A. Clarke
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
A.W. Cross
USTRAT/SUPA, Glasgow, United Kingdom
G. D'Auria, R. Geometrante
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
R.T. Dowd
AS - ANSTO, Clayton, Australia
D. Esperante Pereira
IFIC, Valencia, Spain
W. Fang
SINAP, Shanghai, People's Republic of China
A. Faus-Golfe
LAL, Orsay, France
M. Ferrario
INFN/LNF, Frascati (Roma), Italy
E.N. Gazis
National Technical University of Athens, Athens, Greece
R. Geometrante
KYMA, Trieste, Italy
M. Jacewicz
Uppsala University, Uppsala, Sweden
A. Mostacci
Sapienza University of Rome, Rome, Italy
F. Nguyen
ENEA C.R. Frascati, Frascati (Roma), Italy
F. Pérez
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
J.M.A. Priem
VDL ETG, Eindhoven, The Netherlands
T. Schmidt
PSI, Villigen PSI, Switzerland

H2020 CompactLight Project aims at designing the next generation of compact hard X-Rays Free-Electron Lasers, relying on very high accelerating gradients and on novel undulator concepts. CompactLight intends to design a compact Hard X-ray FEL facility based on very high-gradient acceleration in the X band of frequencies, on a very bright photo injector, and on short-period/superconductive undulators to enable smaller electron beam energy. If compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, be significantly more compact, as a consequence both of the lower energy and of the high-gradient X-band structures, have lower electrical power demand and a smaller footprint. CompactLight is a consortium of 24 institutes (21 European + 3 extra Europeans), gathering the world-leading experts both in the domains of X-band acceleration and undulator design.

Slides WEP1WC02 [12.831 MB]

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WEA2WD03

Analysis of Electron Trajectories in Harmonic Undulator with SCILAB's Model Based Design Codes

ion, simulation, electron, FEL

93

H. Jeevakhan, S. Kumar
NITTTR, Bhopal, India
G. Mishra
Devi Ahilya University, Indore, India

Scilab's X-cos model-based simulation blocks has been used to simulate the trajectories of an electron traversing through an Harmonic undulator. The trajectory of electron along X and Y directions has been simulated from Numerical and analytical methods. Analysis given in the present paper is compared with the other codes. Parallel simulation of Harmonic undulator magnetic field along with trajectories of electron is given in the present analysis.

Slides WEA2WD03 [0.652 MB]

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WEA2WD04

Harmonic Undulator Radiation with Dual Non Periodic Magnetic Components

ion, electron, radiation, FEL

98

H. Jeevakhan
NITTTR, Bhopal, India
G. Mishra
Devi Ahilya University, Indore, India

Undulator radiation at third harmonics generated by harmonic undulator in the presence dual non periodic constant magnetic field. Electron trajectories along the x and y direction has been determined analytical and numerical methods. Generalized Bessel function is used to determine the intensity of radiation and Simpson's numerical method of integration is used to find the effect of constant magnetic fields. Comparison with previous analysis has also been presented.

Slides WEA2WD04 [1.050 MB]

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WEP2PT003

Undulator Phase Matching for the the European XFEL

ion, FEL, electron, radiation

103

Y. Li, J. Pflüger
XFEL. EU, Hamburg, Germany

The undulator system in the European XFEL is mainly comprised 5-m long undulator segments and 1.1 m long intersections in between. In intersections the electron velocity is faster than it inside an undulator and the optical phase is detuned. The detune effect is also from the undulator fringe field where electron longitudinal speed also deviates from the oscillation condition. The total detune effect is compensated by a magnetic device called phase shifter, which is correspondingly set for a specific undulator gap. In this paper we introduce the method to set the phase shifter gap for each K parameter according to the measured magnetic field.

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WEP2PT022

PHASE SHIFTER APPLICATION IN DOUBLE UNDULATOR CONFIGURATION OF HEPS

ion, brilliance, radiation, electron

120

X.Y. Li, Y. Jiao, S.K. Tian
IHEP, Beijing, People's Republic of China

For over 6 meters long straight-section of HEPS, collinear double-cryogenic permanent magnet undulator(CPMU) is designed for high energy photon users to achieve higher brightness. Angular and spatial profiles of radiation produced by the double undulator configuration have been derived analytically. The efficiency of phase shifter on improving the brightness of double-CPMU is therefore evaluated with the beam energy spread and emittance are taken into account. Optimized beta-functions of electron beam are obtained.

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WEP2PT030

Undulator Development Activities at DAVV-Indore

ion, radiation, synchrotron, synchrotron-radiation

133

M. Gehlot, R. Khullar, G. Mishra
Devi Ahilya University, Indore, India
H. Jeevakhan
NITTTR, Bhopal, India
G. Sharma
RI Research Instruments GmbH, Bergisch Gladbach, Germany

Insertion Device Design Laboratory, DAVV has development activities on in-house design, fabrication and measurement of prototype undulators for synchrotron radiation and free electron laser application. The first prototype U50 was built with six periods, 50mm each period. It was PPM type. The next prototype U20 hybrid device based on NdFeB-Cobalt steel was built with aim to produce 0.24T to 0.05T in 10-20mm gap. The undulator is a 20mm period and there are 25 periods. The next one is U50-II PPM structure with 20 periods. In this paper we review the designs of all these undulators and briefly outline the user facilities of Hall probe bench, Pulsed wire bench and stretched wire magnetic measurement systems at IDDL.

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WEP2PT033

Conceptual Design of Superconducting Transverse Gradient Undulator for PAL-XFEL Beamline

ion, FEL, operation, electron

142

S.J. Lee, J.H. Han
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT \& Future Planning(2017R1C1B1012852)
Recently, the transverse gradient undulator (TGU) applications are suggested from the laser plasma wake-field accelerator (LPWA) to ultimate storage ring (USR). Especially for X-ray FEL, TGU can be used to generate the large bandwidth radiation (up to §I10{\percent}). In this proceeding, the review of PAL-XFEL beam parameters and TGU requirements was done to apply a variable large bandwidth operation to the PAL-XFEL beamlines. Also, the conceptual design of TGU, based on superconducting undulator (SCU) was proposed, and B-field calculation results were introduced for PAL-XFEL large bandwidth operation mode.

Poster WEP2PT033 [0.927 MB]

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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, vacuum

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]

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THP2WD01

Construction and Optimization of Cryogenic Undulators at SOLEIL

ion, cryogenics, vacuum, 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)

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