FEL2015 - Classification: Status of Projects and Facilities

Paper	Title	Page
MOP010	Linac Design of the IR-FEL Project in CHINA	46
	Z.G. He, Q.K. Jia, L. Wang, W. Xu, S.C. Zhang USTC/NSRL, Hefei, Anhui, People's Republic of China
	We are building an infrared free-electron laser (IR-FEL) facility that will operate from 5 um to 200 um. This FEL source is drived by a linac, which is composed of a triode electron gun, a subharmonic prebuncher, a buncher, two accelerators, and a beam transport line. The linac is required to operate from 15 to 60 MeV at 1 nC charge, while delivering a transverse rms emittance of smaller than 30 mm-mrad in a 5 ps rms length, smaller than 240 keV rms energy spread bunch at the Far-infrared and Mid-infrared undulators. In this article, the preliminary Linac design studies are described.
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MOP011	Status of CLARA, a New FEL Test Facility	49
	J.A. Clarke, D. Angal-Kalinin, A.D. Brynes, R.K. Buckley, S.R. Buckley, L.S. Cowie, D.J. Dunning, B.D. Fell, P. Goudket, A.R. Goulden, P.C. Hornickel, F. Jackson, S.P. Jamison, J.K. Jones, K.B. Marinov, P.A. McIntosh, J.W. McKenzie, K.J. Middleman, B.L. Militsyn, A.J. Moss, B.D. Muratori, M.D. Roper, L.K. Rudge, Y.M. Saveliev, B.J.A. Shepherd, R.J. Smith, S.L. Smith, E.W. Snedden, M. Surman, T.T. Thakker, N. Thompson, R. Valizadeh, A.E. Wheelhouse, P.H. Williams STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom R.B. Appleby, K. Hanahoe, O. Mete Apsimon, H.L. Owen, G.X. Xia UMAN, Manchester, United Kingdom P. Atkinson, N. Bliss, R.J. Cash, N.A. Collomb, G. Cox, G.P. Diakun, S. Dobson, A. Gallagher, S.A. Griffiths, C. Hill, C. Hodgkinson, D.M.P. Holland, T.J. Jones, B.G. Martlew, J. Williams STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom R. Bartolini, I.P.S. Martin DLS, Oxfordshire, United Kingdom S.T. Boogert, E. Yamakawa Royal Holloway, University of London, Surrey, United Kingdom G. Burt, P.N. Ratoff Lancaster University, Lancaster, United Kingdom L.T. Campbell, A.J.T. Colin, J. Henderson, B. Hidding, B.W.J. MᶜNeil USTRAT/SUPA, Glasgow, United Kingdom A.M. Kolano University of Huddersfield, Huddersfield, United Kingdom A. Lyapin JAI, Egham, Surrey, United Kingdom V.V. Paramonov, A.K. Skasyrskaya RAS/INR, Moscow, Russia J.D.A. Smith TXUK, Warrington, United Kingdom S. Spampinati Cockcroft Institute, Warrington, Cheshire, United Kingdom Y. Wei, C.P. Welsch, A. Wolski The University of Liverpool, Liverpool, United Kingdom
	CLARA is a new FEL test facility being developed at STFC Daresbury Laboratory in the UK. The main motivation for CLARA is to test new FEL schemes that can later be implemented on existing and future short wavelength FELs. Particular focus will be on ultra-short pulse generation, pulse stability, and synchronisation with external sources. The project is now underway and the Front End section (photoinjector and first linac) installation will begin later this year. This paper will discuss the progress with the Front End assembly and also highlighting other topics which are currently receiving significant attention.
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MOP012	Present Status of Source Development Station at UVSOR-III	54
	N.S. Mirian, K. Hayashi, M. Katoh, J. Yamazaki UVSOR, Okazaki, Japan M. Hosaka, Y. Takashima Nagoya University, Nagoya, Japan T. Konomi, N. Yamamoto KEK, Ibaraki, Japan H. Zen Kyoto University, Kyoto, Japan
	Construction and development of a source development station are in progress at UVSOR-III, a 750 MeV electron storage ring. It is equipped with an optical klystron type undulator system, a mode lock Ti:Sa Laser system, a dedicated beam-line for visible-VUV radiation and a parasitic beam-line for THz radiation. New light port to extract edge radiation was constructed recently. An optical cavity for a resonator free electron laser is currently being reconstructed. Some experiments such as coherent THz radiation, coherent harmonic radiation, laser Compton Scattering gamma-rays and optical vortices are in progress.
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MOP013	The Fermi Seeded FEL Facility: Operational Experience and Future Perspectives	57
	L. Giannessi, E. Allaria, L. Badano, F. Bencivenga, C. Callegari, F. Capotondi, D. Castronovo, P. Cinquegrana, M. Coreno, R. Cucini, I. Cudin, G. D'Auria, M.B. Danailov, R. De Monte, G. De Ninno, P. Delgiusto, A.A. Demidovich, S. Di Mitri, B. Diviacco, A. Fabris, R. Fabris, W.M. Fawley, M. Ferianis, E. Ferrari, P. Finetti, P. Furlan Radivo, G. Gaio, D. Gauthier, F. Gelmetti, F. Iazzourene, M. Kiskinova, S. Krecic, M. Lonza, N. Mahne, M. Manfredda, C. Masciovecchio, M. Milloch, F. Parmigiani, E. Pedersoli, G. Penco, L. Pivetta, O. Plekan, M. Predonzani, K.C. Prince, E. Principi, L. Raimondi, P. Rebernik Ribič, F. Rossi, E. Roussel, L. Rumiz, C. Scafuri, C. Serpico, P. Sigalotti, M. Svandrlik, C. Svetina, M. Trovò, A. Vascotto, M. Veronese, R. Visintini, D. Zangrando, M. Zangrando Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	FERMI is the seeded FEL user facility in Trieste, Italy, producing photons from the VUV to the soft X-rays with a high degree of coherence and spectral stability. Both FEL lines, FEL-1 and FEL-2, are available for users, down to the shortest wavelength of 4 nm. We report on the completion of the commissioning of the high energy FEL line, FEL-2, on the most recent progress obtained on FEL-1 and on the operational experience for users, in particular those requiring specific FEL configurations, such as two-colour experiments. We will also give a perspective on the improvements and upgrades which have been triggered based on our experience, aiming to maintain as well as to constantly improve the performance of the facility for our user community.
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MOP014	Status of the Soft X-Ray FEL User Facility FLASH	61
	K. Honkavaara, B. Faatz, J. Feldhaus, S. Schreiber, R. Treusch, M. Vogt DESY, Hamburg, Germany
	Since 10 years FLASH at DESY (Hamburg, Germany) has provided high brilliance FEL radiation at XUV and soft X-ray wavelengths for user experiments. Recently FLASH has been upgraded with a second undulator beamline, FLASH2, whose commissioning takes place in parallel of the user operation on FLASH1. This paper summarizes the performance of the FLASH facility during the last user period from January 2014 to April 2015.
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MOP016	Status of the Fabrication of PAL-XFEL Magnet Power Supplies	66
	S.-H. Jeong, Y.-G. Jung, H.-S. Kang, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, B.G. Oh, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea
	PAL-XFEL has been constructing including a 10 GeV linac, hard X-ray and soft X-ray branches. PAL-XFEL required for about six hundreds of magnet power supply (MPS). The eight different prototypes of MPS are developing to confirm the performance, functions, size, heat load and so on. This paper describes the test results of the prototype MPS in major specifications. All MPSs have to be installed the end of September in 2015. The installation progress of the MPS was also described.
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MOP017	Beam Commissioning Plan for the SwissFEL Hard-X-Ray Facility	69
	T. Schietinger PSI, Villigen PSI, Switzerland
	The SwissFEL facility currently being assembled at the Paul Scherrer Institute is designed to provide FEL radiation in the photon wavelength range between 0.1 and 7 nm. The commissioning of the first phase, comprising the electron injector, the main electron linear accelerator and the first undulator line, named Aramis and dedicated to the production of hard X-rays, is planned for the years 2016 and 2017. We present an overview of the beam commissioning plan elaborated in accordance with the installation schedule to bring into operation the various subsystems and establish beam parameters compatible with first pilot user experiments in late 2017.
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MOP018	Comparison of Astra Simulations With Beam Parameter Measurements at the Kaeri Ultrashort Pulse Facility	74
	H.W. Kim, I.H. Baek, M.S. Chae, B.A. Gudkov, B. Han, K.H. Jang, Y.U. Jeong, Y. Kim, K. Lee, S.V. Miginsky, S. H. Park, S. Park, S. Setiniyaz, N. Vinokurov KAERI, Daejon, Republic of Korea K.H. Jang, Y.U. Jeong, H.W. Kim, K. Lee, S.V. Miginsky, S. H. Park, N. Vinokurov University of Science and Technology of Korea (UST), Daejeon, Republic of Korea S.V. Miginsky, N. Vinokurov BINP SB RAS, Novosibirsk, Russia
	An RF-photogun-based linear accelerator for ultra-short electron beam generation is under construction at Korea Atomic Energy Research Institute (KAERI). This facility are mainly composed of an 1.5 cell S-band (2856 MHz) RF gun, a travelling wave type linac 3 m long and 90-degree achromatic bends. The emitted electron beams are accelerated in high RF field to ~ 3 MeV. The electrons can be deflected by a first bending magnet installed right after the RF gun. Each beamline has second bending magnet similar to the first one and three quadrupoles between the bending magnets. Two bending and three quadrupole magnets compose the 90-degree achromatic bend. The deflected electron beams will be used for ultrafast electron diffraction (UED) experiments. We have performed computer simulation using ASTRA code to investigate the electron beam dynamics in the system with the input data of bead tested gun electric field distribution and the magnetic fields of the magnets. We will present the simulated and experimental electron beam parameters.
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TUP010	Recent Progress in Upgrade of the High-Intensity THz-FEL at Osaka University	354
	G. Isoyama, M. Fujimoto, S. Funakoshi, K. Furukawa, A. Irizawa, R. Kato, K. Kawase, A. Tokuchi, R. Tsutsumi, M. Yaguchi ISIR, Osaka, Japan
	We are upgrading the THz-FEL at Osaka University for its applications to high intensity THz sciences, which originally generated the high intensity FEL with the macropulse energy up to 3.7 mJ and the micropulse energy up to ~10 uJ at a wavelength around 70 um. To increase the micropulse energy, charge in electron bunches is increased four time higher and the bunch intervals are expanded four times longer to maintain the average current in the linac unchanged. In the new operation mode, the macropulse energy increases up to 26 mJ and the micropulse energy to ~0.2 mJ, which is 20 times higher than the energy previously obtained in the conventional mode. We have developed a solid-state switch for the klystron modulator to highly stabilize the klystron voltage, so that the output power of the FEL becomes stable. We are conducting basic studies on FEL for further improvement of its performance, including measurement of power evolution from start-up to saturation, time structures of FEL micropulses measured with a Michelson interferometer, and time structures of macropulses measured with a Schottky diode detector. We will report results of these studies on the THz-FEL at Osaka University.
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TUP011	Performance and Tolerance Studies of the X-Ray Production for the X-Band FEL Collaboration	359
	J. Pfingstner, E. Adli University of Oslo, Oslo, Norway
	The X-band FEL collaboration is currently designing an X-ray free-electron laser based on X-band acceleration technology. This paper reports on the recent progress on the design of the undulator part of this machine including simulations of the X-ray production process. The basic parameters have been chosen and a beam transport system has been designed, considering strong and weak focusing of quadrupole and undulator magnets. Simulations of the X-ray production process have been carried out with realistic input beam distributions from particle tracking studies of the linac design team. The expectable X-ray properties for SASE and seeded FEL operation have been investigated and also undulator taper options have been studied.
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TUP012	Plans for an EEHG-based Short-Pulse Facility at the DELTA Storage Ring	363
	S. Hilbrich, F.H. Bahnsen, M. Bolsinger, M.A. Jebramcik, S. Khan, C. Mai, A. Meyer auf der Heide, R. Molo, H. Rast, G. Shayeganrad, P. Ungelenk DELTA, Dortmund, Germany
	Funding: Work supported by DFG, BMBF, FZ Jülich, and by the Federal State NRW. The 1.5-GeV synchrotron light source DELTA, operated by the TU Dortmund University, comprises a short-pulse facility based on the coherent harmonic generation (CHG) technique, which allows for the generation of radiation pulses with wavelengths down to 50 nm and a duration of 50 fs. In order to reach even shorter wavelengths, the present setup will be modified to employ the echo-enabled harmonic generation (EEHG) and femtoslicing techniques. In this paper, recent developments including an improved lattice design and a concept for the new vacuum chambers will be presented.
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TUP013	The X-Band FEL Collaboration	368
	J. Pfingstner, E. Adli University of Oslo, Oslo, Norway A.A. Aksoy, Ö. Yavaş Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey D. Angal-Kalinin, J.A. Clarke STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom C.J. Bocchetta, A.I. Wawrzyniak Solaris, Kraków, Poland M.J. Boland, T.K. Charles, R.T. Dowd, G. LeBlanc, Y.E. Tan, K.P. Wootton, D. Zhu SLSA, Clayton, Australia G. Burt Lancaster University, Lancaster, United Kingdom N. Catalán Lasheras, A. Grudiev, A. Latina, D. Schulte, S. Stapnes, I. Syratchev, W. Wuensch CERN, Geneva, Switzerland A. Charitonidis NTUA, Athens, Greece G. D'Auria, S. Di Mitri, C. Serpico Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy T.J.C. Ekelöf, M. Jacewicz, R.J.M.Y. Ruber, V.G. Ziemann Uppsala University, Uppsala, Sweden W. Fang, Q. Gu SINAP, Shanghai, People's Republic of China E.N. Gazis National Technical University of Athens, Athens, Greece X.J.A. Janssen VDL ETG, Eindhoven, The Netherlands Z. Nergiz Nigde University, Nigde, Turkey
	The X-band FEL collaboration is currently designing an X-ray free-electron laser based on X-band acceleration technology. Due to the higher accelerating gradients achievable with X-band technology, a X-band normal conducting linac can be shorter and therefore potentially cost efficient than what is achievable with lower frequency structures. This cost reduction of future FEL facilities addresses the growing demand of the user community for coherent X-rays. The X-band FEL collaboration consists of 12 institutes and universities that jointly work on the preparation of design reports for the specific FEL projects. In this paper, we report on the on-going activities, the basic parameter choice, and the integrated simulation results. We also outline the interest of the X-band FEL collaboration to use the electron linac CALIFES at CERN to test FEL concepts and technologies relevant for the X-band FEL collaboration.
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TUP014	Beam Commissioning and Initial Measurements on the MAX IV 3 GeV Linac	375
	S. Thorin, J. Andersson, F. Curbis, M. Eriksson, L. Isaksson, O. Karlberg, D. Kumbaro, F. Lindau, E. Mansten, D.F. Olsson, S. Werin MAX-lab, Lund, Sweden
	The linear accelerator at the MAX IV facility in Lund, Sweden, was constructed for injection and top up of the two storage rings and as a high brightness driver for the Short Pulse Facility. It is also prepared to be used as an injector for a possible future Free Electron Laser. Installation of the linac was completed and beam commissioning started in the early fall of 2014. In this paper we present the progress during the first phase of commissioning along with results from initial measurements of optics, emittance, beam energy and charge.
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TUP015	Status of the ALICE IR-FEL: from ERL Demonstrator to User Facility	379
	N. Thompson, J.A. Clarke, D.J. Dunning, A.J. Moss, Y.M. Saveliev, M. Surman STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom T. Craig, M.R.F. Siggel-King, P. Weightman The University of Liverpool, Liverpool, United Kingdom O.V. Kolosov, P.D. Tovee Lancaster University, Lancaster, United Kingdom M.R.F. Siggel-King Cockcroft Institute, Warrington, Cheshire, United Kingdom
	The ALICE (Accelerators and Lasers In Combined Experiments) accelerator at STFC Daresbury Laboratory in the UK was conceived in 2003 and constructed as a short-term Energy Recovery Linac demonstrator to develop the underpinning technology and expertise required for a proposed 600MeV ERL-based FEL facility. In this paper we present an update on the performance and status of ALICE which now operates as a funded IR-FEL user facility. We discuss the challenges of evolving a short-term demonstrator into a stable, reliable user facility and present a summary of the current scientific programme.
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TUP017	HPC Simulation Suite for Future FELs	384
	L.T. Campbell, A.J.T. Colin, B.W.J. MᶜNeil, P. Traczykowski USTRAT/SUPA, Glasgow, United Kingdom R.J. Allan The Hartree Centre, Science and Technology Facilities Council (STFC/DL), Warrington, United Kingdom D.J. Dunning, N. Thompson, P.H. Williams STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom D.J. Dunning, B.D. Muratori, N. Thompson, P.H. Williams Cockcroft Institute, Warrington, Cheshire, United Kingdom J.D.A. Smith Tech-X, Boulder, Colorado, USA
	A new HPC simulation suite, intended to aid in both the investigation of novel FEL physics and the design of new FEL facilities, is described. The integrated start-to-end suite, currently under development, incorporates both plasma (VSim) and linac (ELEGANT, ASTRA) accelerator codes, and will include the 3D unaveraged FEL code Puffin to probe novel FEL effects.
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WEA01	Current Status of PAL-XFEL Facility
	H.-S. Lee, H.-S. Kang, K.W. Kim, I.S. Ko PAL, Pohang, Kyungbuk, Republic of Korea I.S. Ko POSTECH, Pohang, Kyungbuk, Republic of Korea
	Funding: The authors would like to gratefully acknowledge support by MSICTFP. PAL-XFEL facility is an 1110 meters long laboratory for generating X-ray free electron laser. The radiation ranges between 0.1 and 10 nm. The facility consisted of three halls, a 780 m S-band linac hall for 10 GeV, a 225 m undulator hall for hard X-ray and a 10⁵ m hard X-ray beam-line hall for user experiments. A soft X-ray undulator and a soft X-ray beam-line hall which have the length of 110 and 100 meters respectively are built in the facility. The building construction was completed in February 17, 2015. The installation of devices had been started accordingly.
	Slides WEA01 [6.167 MB]
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WEA02	Status of SXFEL and DCLS
	B. Liu, J.H. Chen, J.H. Chen, J. Chen, Z.H. Chen, H.X. Deng, J.G. Ding, G.P. Fang, W. Fang, M. Gu, Q. Gu, X. Hu, D. Huang, M.M. Huang, Y.B. Leng, B. Li, G.Q. Lin, Y. Liu, S. Sun, D. Wang, G. Wang, L. Wang, L. Yin, L.Y. Yu, M. Zhang, W. Zhang, Z.T. Zhao, S.P. Zhong, Q.G. Zhou SINAP, Shanghai, People's Republic of China D.X. Dai, G.R. Wu, X.M. Yang, W.Q. Zhang DICP, Dalian, People's Republic of China Y.-C. Du, W.-H. Huang TUB, Beijing, People's Republic of China
	Shanghai Soft X-ray Free-Electron Laser test facility (SXFEL) and Dalian Coherent Light Source (DCLS) and are two main ongoing FEL projects in mainland China, and the design, construction and commissioning will be carried out by Shanghai Institute of Applied Physics. Introduction to these two projects, including background, parameters, design and current status will be presented.
	Slides WEA02 [15.344 MB]
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WEA03	SwissFEL Status Report	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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WEA04	Status of the European XFEL
	W. Decking DESY, Hamburg, Germany
	The European XFEL is under construction in the Hamburg region, Germany. The 3.3 km long facility aims at providing FEL radiation in the range from 260 eV up to 24 keV out of three undulators that can be operated simultaneously with up to 27000 pulses/second. The FEL is driven by a 17.5 GeV linear accelerator based on TESLA-type superconducting accelerator modules. This paper gives an update on the project status and an outlook towards the commissioning and fist operation.
	Slides WEA04 [3.698 MB]
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WEA05	Status of SACLA
	M. Yabashi RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
	As the first compact XFEL facility, SACLA has operated for users over three years since March 2012. SACLA has routinely generated XFEL light in a photon energy range from 4 to 15 keV with a pulse energy of 0.5 mJ at 10 keV and a pulse duration less than 10 fs [1,2], which corresponds to a high peak power of several tens gigawatts. One of the unique characters of SACLA is to produce two-color SASE XFEL light with a large separation of the two wavelengths over 30% by using variable-gap, in-vacuum undulators [3]. Another feature is to employ state-of-the-art X-ray optics and diagnostics, in particular, X-ray focusing optics: A two-stage focusing system successfully generates an extremely high intensity of 10²⁰ W/cm² by forming a 50-nm spot [4]. These advanced technologies enabled to explore unique researches in a field of quantum/non-linear x-ray optics [5,6]. Recently, SACLA has produced a number of scientific achievements in various fields of researches (see http://xfel.riken.jp/eng/research/indexnne.html). To expand experimental opportunities for users, we commenced construction of the 2nd XFEL beamline (BL2) in 2013. We installed a full undulator line and a beam line, being independent of those in the existing BL3. We started commissioning of the beamline on October 8th, 2014, and observed a first lasing on 21st. A first user experiment was performed on April, 2015. [1] T. Ishikawa et al., Nat Photon. 6, 540 (2012) [2] Y. Inubushi et al., PRL 109, 144801 (2012) [3] T. Hara et al., Nat Com. 4, 2919 (2013) [4] H. Mimura et al., Nat Com. 5, 3539 (2014) [5] K. Tamasaku et al., Nat Photon. 8, 313 (2014) [6] H. Yoneda et al., Nat Com. 5, 5080 (2014)
	Slides WEA05 [21.910 MB]
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WEP014	LCLS-II: Status of the CW X-ray FEL Upgrade to the LCLS Facility	618
	T.O. Raubenheimer SLAC, Menlo Park, California, USA
	Funding: Work supported by Department of Energy contract DE-AC02-76SF00515 The LCLS-II is a CW X-ray FEL based on a 4 GeV superconducting RF linac that will upgrade the LCLS facility at the SLAC National Accelerator Laboratory. The upgrade is being constructed by a collaboration including ANL, Cornell, Fermilab, JLab, LBNL, and SLAC. This talk will describe the status of the LCLS-II project as well as the major technical issues and R&D to address them. Presented on behalf of the LCLS-II collaboration
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WEP016	Free Electron Lasers in 2015	625
	K. R. Cohn, J. Blau, W.B. Colson, J.W. Ng, M.J. Price NPS, Monterey, California, USA
	Funding: This work has been supported by the High Energy Laser Joint Technology Office. Thirty-nine years after the first operation of the short wavelength free electron laser (FEL) at Stanford University, there continue to be many important experiments, proposed experiments, and user facilities around the world. Properties of FELs in the infrared, visible, UV, and x-ray wavelength regimes are tabulated and discussed.
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Paper

Title

Page

Linac Design of the IR-FEL Project in CHINA

46

Z.G. He, Q.K. Jia, L. Wang, W. Xu, S.C. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China

We are building an infrared free-electron laser (IR-FEL) facility that will operate from 5 um to 200 um. This FEL source is drived by a linac, which is composed of a triode electron gun, a subharmonic prebuncher, a buncher, two accelerators, and a beam transport line. The linac is required to operate from 15 to 60 MeV at 1 nC charge, while delivering a transverse rms emittance of smaller than 30 mm-mrad in a 5 ps rms length, smaller than 240 keV rms energy spread bunch at the Far-infrared and Mid-infrared undulators. In this article, the preliminary Linac design studies are described.

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MOP011

Status of CLARA, a New FEL Test Facility

49

J.A. Clarke, D. Angal-Kalinin, A.D. Brynes, R.K. Buckley, S.R. Buckley, L.S. Cowie, D.J. Dunning, B.D. Fell, P. Goudket, A.R. Goulden, P.C. Hornickel, F. Jackson, S.P. Jamison, J.K. Jones, K.B. Marinov, P.A. McIntosh, J.W. McKenzie, K.J. Middleman, B.L. Militsyn, A.J. Moss, B.D. Muratori, M.D. Roper, L.K. Rudge, Y.M. Saveliev, B.J.A. Shepherd, R.J. Smith, S.L. Smith, E.W. Snedden, M. Surman, T.T. Thakker, N. Thompson, R. Valizadeh, A.E. Wheelhouse, P.H. Williams
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
R.B. Appleby, K. Hanahoe, O. Mete Apsimon, H.L. Owen, G.X. Xia
UMAN, Manchester, United Kingdom
P. Atkinson, N. Bliss, R.J. Cash, N.A. Collomb, G. Cox, G.P. Diakun, S. Dobson, A. Gallagher, S.A. Griffiths, C. Hill, C. Hodgkinson, D.M.P. Holland, T.J. Jones, B.G. Martlew, J. Williams
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
R. Bartolini, I.P.S. Martin
DLS, Oxfordshire, United Kingdom
S.T. Boogert, E. Yamakawa
Royal Holloway, University of London, Surrey, United Kingdom
G. Burt, P.N. Ratoff
Lancaster University, Lancaster, United Kingdom
L.T. Campbell, A.J.T. Colin, J. Henderson, B. Hidding, B.W.J. MᶜNeil
USTRAT/SUPA, Glasgow, United Kingdom
A.M. Kolano
University of Huddersfield, Huddersfield, United Kingdom
A. Lyapin
JAI, Egham, Surrey, United Kingdom
V.V. Paramonov, A.K. Skasyrskaya
RAS/INR, Moscow, Russia
J.D.A. Smith
TXUK, Warrington, United Kingdom
S. Spampinati
Cockcroft Institute, Warrington, Cheshire, United Kingdom
Y. Wei, C.P. Welsch, A. Wolski
The University of Liverpool, Liverpool, United Kingdom

CLARA is a new FEL test facility being developed at STFC Daresbury Laboratory in the UK. The main motivation for CLARA is to test new FEL schemes that can later be implemented on existing and future short wavelength FELs. Particular focus will be on ultra-short pulse generation, pulse stability, and synchronisation with external sources. The project is now underway and the Front End section (photoinjector and first linac) installation will begin later this year. This paper will discuss the progress with the Front End assembly and also highlighting other topics which are currently receiving significant attention.

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MOP012

Present Status of Source Development Station at UVSOR-III

54

N.S. Mirian, K. Hayashi, M. Katoh, J. Yamazaki
UVSOR, Okazaki, Japan
M. Hosaka, Y. Takashima
Nagoya University, Nagoya, Japan
T. Konomi, N. Yamamoto
KEK, Ibaraki, Japan
H. Zen
Kyoto University, Kyoto, Japan

Construction and development of a source development station are in progress at UVSOR-III, a 750 MeV electron storage ring. It is equipped with an optical klystron type undulator system, a mode lock Ti:Sa Laser system, a dedicated beam-line for visible-VUV radiation and a parasitic beam-line for THz radiation. New light port to extract edge radiation was constructed recently. An optical cavity for a resonator free electron laser is currently being reconstructed. Some experiments such as coherent THz radiation, coherent harmonic radiation, laser Compton Scattering gamma-rays and optical vortices are in progress.

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MOP013

The Fermi Seeded FEL Facility: Operational Experience and Future Perspectives

57

L. Giannessi, E. Allaria, L. Badano, F. Bencivenga, C. Callegari, F. Capotondi, D. Castronovo, P. Cinquegrana, M. Coreno, R. Cucini, I. Cudin, G. D'Auria, M.B. Danailov, R. De Monte, G. De Ninno, P. Delgiusto, A.A. Demidovich, S. Di Mitri, B. Diviacco, A. Fabris, R. Fabris, W.M. Fawley, M. Ferianis, E. Ferrari, P. Finetti, P. Furlan Radivo, G. Gaio, D. Gauthier, F. Gelmetti, F. Iazzourene, M. Kiskinova, S. Krecic, M. Lonza, N. Mahne, M. Manfredda, C. Masciovecchio, M. Milloch, F. Parmigiani, E. Pedersoli, G. Penco, L. Pivetta, O. Plekan, M. Predonzani, K.C. Prince, E. Principi, L. Raimondi, P. Rebernik Ribič, F. Rossi, E. Roussel, L. Rumiz, C. Scafuri, C. Serpico, P. Sigalotti, M. Svandrlik, C. Svetina, M. Trovò, A. Vascotto, M. Veronese, R. Visintini, D. Zangrando, M. Zangrando
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

FERMI is the seeded FEL user facility in Trieste, Italy, producing photons from the VUV to the soft X-rays with a high degree of coherence and spectral stability. Both FEL lines, FEL-1 and FEL-2, are available for users, down to the shortest wavelength of 4 nm. We report on the completion of the commissioning of the high energy FEL line, FEL-2, on the most recent progress obtained on FEL-1 and on the operational experience for users, in particular those requiring specific FEL configurations, such as two-colour experiments. We will also give a perspective on the improvements and upgrades which have been triggered based on our experience, aiming to maintain as well as to constantly improve the performance of the facility for our user community.

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MOP014

Status of the Soft X-Ray FEL User Facility FLASH

61

K. Honkavaara, B. Faatz, J. Feldhaus, S. Schreiber, R. Treusch, M. Vogt
DESY, Hamburg, Germany

Since 10 years FLASH at DESY (Hamburg, Germany) has provided high brilliance FEL radiation at XUV and soft X-ray wavelengths for user experiments. Recently FLASH has been upgraded with a second undulator beamline, FLASH2, whose commissioning takes place in parallel of the user operation on FLASH1. This paper summarizes the performance of the FLASH facility during the last user period from January 2014 to April 2015.

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MOP016

Status of the Fabrication of PAL-XFEL Magnet Power Supplies

66

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

PAL-XFEL has been constructing including a 10 GeV linac, hard X-ray and soft X-ray branches. PAL-XFEL required for about six hundreds of magnet power supply (MPS). The eight different prototypes of MPS are developing to confirm the performance, functions, size, heat load and so on. This paper describes the test results of the prototype MPS in major specifications. All MPSs have to be installed the end of September in 2015. The installation progress of the MPS was also described.

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MOP017

Beam Commissioning Plan for the SwissFEL Hard-X-Ray Facility

69

T. Schietinger
PSI, Villigen PSI, Switzerland

The SwissFEL facility currently being assembled at the Paul Scherrer Institute is designed to provide FEL radiation in the photon wavelength range between 0.1 and 7 nm. The commissioning of the first phase, comprising the electron injector, the main electron linear accelerator and the first undulator line, named Aramis and dedicated to the production of hard X-rays, is planned for the years 2016 and 2017. We present an overview of the beam commissioning plan elaborated in accordance with the installation schedule to bring into operation the various subsystems and establish beam parameters compatible with first pilot user experiments in late 2017.

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MOP018

Comparison of Astra Simulations With Beam Parameter Measurements at the Kaeri Ultrashort Pulse Facility

74

H.W. Kim, I.H. Baek, M.S. Chae, B.A. Gudkov, B. Han, K.H. Jang, Y.U. Jeong, Y. Kim, K. Lee, S.V. Miginsky, S. H. Park, S. Park, S. Setiniyaz, N. Vinokurov
KAERI, Daejon, Republic of Korea
K.H. Jang, Y.U. Jeong, H.W. Kim, K. Lee, S.V. Miginsky, S. H. Park, N. Vinokurov
University of Science and Technology of Korea (UST), Daejeon, Republic of Korea
S.V. Miginsky, N. Vinokurov
BINP SB RAS, Novosibirsk, Russia

An RF-photogun-based linear accelerator for ultra-short electron beam generation is under construction at Korea Atomic Energy Research Institute (KAERI). This facility are mainly composed of an 1.5 cell S-band (2856 MHz) RF gun, a travelling wave type linac 3 m long and 90-degree achromatic bends. The emitted electron beams are accelerated in high RF field to ~ 3 MeV. The electrons can be deflected by a first bending magnet installed right after the RF gun. Each beamline has second bending magnet similar to the first one and three quadrupoles between the bending magnets. Two bending and three quadrupole magnets compose the 90-degree achromatic bend. The deflected electron beams will be used for ultrafast electron diffraction (UED) experiments. We have performed computer simulation using ASTRA code to investigate the electron beam dynamics in the system with the input data of bead tested gun electric field distribution and the magnetic fields of the magnets. We will present the simulated and experimental electron beam parameters.

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TUP010

Recent Progress in Upgrade of the High-Intensity THz-FEL at Osaka University

354

G. Isoyama, M. Fujimoto, S. Funakoshi, K. Furukawa, A. Irizawa, R. Kato, K. Kawase, A. Tokuchi, R. Tsutsumi, M. Yaguchi
ISIR, Osaka, Japan

We are upgrading the THz-FEL at Osaka University for its applications to high intensity THz sciences, which originally generated the high intensity FEL with the macropulse energy up to 3.7 mJ and the micropulse energy up to ~10 uJ at a wavelength around 70 um. To increase the micropulse energy, charge in electron bunches is increased four time higher and the bunch intervals are expanded four times longer to maintain the average current in the linac unchanged. In the new operation mode, the macropulse energy increases up to 26 mJ and the micropulse energy to ~0.2 mJ, which is 20 times higher than the energy previously obtained in the conventional mode. We have developed a solid-state switch for the klystron modulator to highly stabilize the klystron voltage, so that the output power of the FEL becomes stable. We are conducting basic studies on FEL for further improvement of its performance, including measurement of power evolution from start-up to saturation, time structures of FEL micropulses measured with a Michelson interferometer, and time structures of macropulses measured with a Schottky diode detector. We will report results of these studies on the THz-FEL at Osaka University.

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TUP011

Performance and Tolerance Studies of the X-Ray Production for the X-Band FEL Collaboration

359

J. Pfingstner, E. Adli
University of Oslo, Oslo, Norway

The X-band FEL collaboration is currently designing an X-ray free-electron laser based on X-band acceleration technology. This paper reports on the recent progress on the design of the undulator part of this machine including simulations of the X-ray production process. The basic parameters have been chosen and a beam transport system has been designed, considering strong and weak focusing of quadrupole and undulator magnets. Simulations of the X-ray production process have been carried out with realistic input beam distributions from particle tracking studies of the linac design team. The expectable X-ray properties for SASE and seeded FEL operation have been investigated and also undulator taper options have been studied.

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TUP012

Plans for an EEHG-based Short-Pulse Facility at the DELTA Storage Ring

363

S. Hilbrich, F.H. Bahnsen, M. Bolsinger, M.A. Jebramcik, S. Khan, C. Mai, A. Meyer auf der Heide, R. Molo, H. Rast, G. Shayeganrad, P. Ungelenk
DELTA, Dortmund, Germany

Funding: Work supported by DFG, BMBF, FZ Jülich, and by the Federal State NRW.
The 1.5-GeV synchrotron light source DELTA, operated by the TU Dortmund University, comprises a short-pulse facility based on the coherent harmonic generation (CHG) technique, which allows for the generation of radiation pulses with wavelengths down to 50 nm and a duration of 50 fs. In order to reach even shorter wavelengths, the present setup will be modified to employ the echo-enabled harmonic generation (EEHG) and femtoslicing techniques. In this paper, recent developments including an improved lattice design and a concept for the new vacuum chambers will be presented.

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TUP013

The X-Band FEL Collaboration

368

J. Pfingstner, E. Adli
University of Oslo, Oslo, Norway
A.A. Aksoy, Ö. Yavaş
Ankara University, Accelerator Technologies Institute, Golbasi / Ankara, Turkey
D. Angal-Kalinin, J.A. Clarke
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
C.J. Bocchetta, A.I. Wawrzyniak
Solaris, Kraków, Poland
M.J. Boland, T.K. Charles, R.T. Dowd, G. LeBlanc, Y.E. Tan, K.P. Wootton, D. Zhu
SLSA, Clayton, Australia
G. Burt
Lancaster University, Lancaster, United Kingdom
N. Catalán Lasheras, A. Grudiev, A. Latina, D. Schulte, S. Stapnes, I. Syratchev, W. Wuensch
CERN, Geneva, Switzerland
A. Charitonidis
NTUA, Athens, Greece
G. D'Auria, S. Di Mitri, C. Serpico
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
T.J.C. Ekelöf, M. Jacewicz, R.J.M.Y. Ruber, V.G. Ziemann
Uppsala University, Uppsala, Sweden
W. Fang, Q. Gu
SINAP, Shanghai, People's Republic of China
E.N. Gazis
National Technical University of Athens, Athens, Greece
X.J.A. Janssen
VDL ETG, Eindhoven, The Netherlands
Z. Nergiz
Nigde University, Nigde, Turkey

The X-band FEL collaboration is currently designing an X-ray free-electron laser based on X-band acceleration technology. Due to the higher accelerating gradients achievable with X-band technology, a X-band normal conducting linac can be shorter and therefore potentially cost efficient than what is achievable with lower frequency structures. This cost reduction of future FEL facilities addresses the growing demand of the user community for coherent X-rays. The X-band FEL collaboration consists of 12 institutes and universities that jointly work on the preparation of design reports for the specific FEL projects. In this paper, we report on the on-going activities, the basic parameter choice, and the integrated simulation results. We also outline the interest of the X-band FEL collaboration to use the electron linac CALIFES at CERN to test FEL concepts and technologies relevant for the X-band FEL collaboration.

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TUP014

Beam Commissioning and Initial Measurements on the MAX IV 3 GeV Linac

375

S. Thorin, J. Andersson, F. Curbis, M. Eriksson, L. Isaksson, O. Karlberg, D. Kumbaro, F. Lindau, E. Mansten, D.F. Olsson, S. Werin
MAX-lab, Lund, Sweden

The linear accelerator at the MAX IV facility in Lund, Sweden, was constructed for injection and top up of the two storage rings and as a high brightness driver for the Short Pulse Facility. It is also prepared to be used as an injector for a possible future Free Electron Laser. Installation of the linac was completed and beam commissioning started in the early fall of 2014. In this paper we present the progress during the first phase of commissioning along with results from initial measurements of optics, emittance, beam energy and charge.

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TUP015

Status of the ALICE IR-FEL: from ERL Demonstrator to User Facility

379

N. Thompson, J.A. Clarke, D.J. Dunning, A.J. Moss, Y.M. Saveliev, M. Surman
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
T. Craig, M.R.F. Siggel-King, P. Weightman
The University of Liverpool, Liverpool, United Kingdom
O.V. Kolosov, P.D. Tovee
Lancaster University, Lancaster, United Kingdom
M.R.F. Siggel-King
Cockcroft Institute, Warrington, Cheshire, United Kingdom

The ALICE (Accelerators and Lasers In Combined Experiments) accelerator at STFC Daresbury Laboratory in the UK was conceived in 2003 and constructed as a short-term Energy Recovery Linac demonstrator to develop the underpinning technology and expertise required for a proposed 600MeV ERL-based FEL facility. In this paper we present an update on the performance and status of ALICE which now operates as a funded IR-FEL user facility. We discuss the challenges of evolving a short-term demonstrator into a stable, reliable user facility and present a summary of the current scientific programme.

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TUP017

HPC Simulation Suite for Future FELs

384

L.T. Campbell, A.J.T. Colin, B.W.J. MᶜNeil, P. Traczykowski
USTRAT/SUPA, Glasgow, United Kingdom
R.J. Allan
The Hartree Centre, Science and Technology Facilities Council (STFC/DL), Warrington, United Kingdom
D.J. Dunning, N. Thompson, P.H. Williams
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
D.J. Dunning, B.D. Muratori, N. Thompson, P.H. Williams
Cockcroft Institute, Warrington, Cheshire, United Kingdom
J.D.A. Smith
Tech-X, Boulder, Colorado, USA

A new HPC simulation suite, intended to aid in both the investigation of novel FEL physics and the design of new FEL facilities, is described. The integrated start-to-end suite, currently under development, incorporates both plasma (VSim) and linac (ELEGANT, ASTRA) accelerator codes, and will include the 3D unaveraged FEL code Puffin to probe novel FEL effects.

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WEA01

Current Status of PAL-XFEL Facility

H.-S. Lee, H.-S. Kang, K.W. Kim, I.S. Ko
PAL, Pohang, Kyungbuk, Republic of Korea
I.S. Ko
POSTECH, Pohang, Kyungbuk, Republic of Korea

Funding: The authors would like to gratefully acknowledge support by MSICTFP.
PAL-XFEL facility is an 1110 meters long laboratory for generating X-ray free electron laser. The radiation ranges between 0.1 and 10 nm. The facility consisted of three halls, a 780 m S-band linac hall for 10 GeV, a 225 m undulator hall for hard X-ray and a 10⁵ m hard X-ray beam-line hall for user experiments. A soft X-ray undulator and a soft X-ray beam-line hall which have the length of 110 and 100 meters respectively are built in the facility. The building construction was completed in February 17, 2015. The installation of devices had been started accordingly.

Slides WEA01 [6.167 MB]

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WEA02

Status of SXFEL and DCLS

B. Liu, J.H. Chen, J.H. Chen, J. Chen, Z.H. Chen, H.X. Deng, J.G. Ding, G.P. Fang, W. Fang, M. Gu, Q. Gu, X. Hu, D. Huang, M.M. Huang, Y.B. Leng, B. Li, G.Q. Lin, Y. Liu, S. Sun, D. Wang, G. Wang, L. Wang, L. Yin, L.Y. Yu, M. Zhang, W. Zhang, Z.T. Zhao, S.P. Zhong, Q.G. Zhou
SINAP, Shanghai, People's Republic of China
D.X. Dai, G.R. Wu, X.M. Yang, W.Q. Zhang
DICP, Dalian, People's Republic of China
Y.-C. Du, W.-H. Huang
TUB, Beijing, People's Republic of China

Shanghai Soft X-ray Free-Electron Laser test facility (SXFEL) and Dalian Coherent Light Source (DCLS) and are two main ongoing FEL projects in mainland China, and the design, construction and commissioning will be carried out by Shanghai Institute of Applied Physics. Introduction to these two projects, including background, parameters, design and current status will be presented.

Slides WEA02 [15.344 MB]

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WEA03

SwissFEL Status Report

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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WEA04

Status of the European XFEL

W. Decking
DESY, Hamburg, Germany

The European XFEL is under construction in the Hamburg region, Germany. The 3.3 km long facility aims at providing FEL radiation in the range from 260 eV up to 24 keV out of three undulators that can be operated simultaneously with up to 27000 pulses/second. The FEL is driven by a 17.5 GeV linear accelerator based on TESLA-type superconducting accelerator modules. This paper gives an update on the project status and an outlook towards the commissioning and fist operation.

Slides WEA04 [3.698 MB]

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WEA05

Status of SACLA

M. Yabashi
RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan

As the first compact XFEL facility, SACLA has operated for users over three years since March 2012. SACLA has routinely generated XFEL light in a photon energy range from 4 to 15 keV with a pulse energy of 0.5 mJ at 10 keV and a pulse duration less than 10 fs [1,2], which corresponds to a high peak power of several tens gigawatts. One of the unique characters of SACLA is to produce two-color SASE XFEL light with a large separation of the two wavelengths over 30% by using variable-gap, in-vacuum undulators [3]. Another feature is to employ state-of-the-art X-ray optics and diagnostics, in particular, X-ray focusing optics: A two-stage focusing system successfully generates an extremely high intensity of 10²⁰ W/cm² by forming a 50-nm spot [4]. These advanced technologies enabled to explore unique researches in a field of quantum/non-linear x-ray optics [5,6]. Recently, SACLA has produced a number of scientific achievements in various fields of researches (see http://xfel.riken.jp/eng/research/indexnne.html). To expand experimental opportunities for users, we commenced construction of the 2nd XFEL beamline (BL2) in 2013. We installed a full undulator line and a beam line, being independent of those in the existing BL3. We started commissioning of the beamline on October 8th, 2014, and observed a first lasing on 21st. A first user experiment was performed on April, 2015.
[1] T. Ishikawa et al., Nat Photon. 6, 540 (2012)
[2] Y. Inubushi et al., PRL 109, 144801 (2012)
[3] T. Hara et al., Nat Com. 4, 2919 (2013)
[4] H. Mimura et al., Nat Com. 5, 3539 (2014)
[5] K. Tamasaku et al., Nat Photon. 8, 313 (2014)
[6] H. Yoneda et al., Nat Com. 5, 5080 (2014)

Slides WEA05 [21.910 MB]

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WEP014

LCLS-II: Status of the CW X-ray FEL Upgrade to the LCLS Facility

618

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

Funding: Work supported by Department of Energy contract DE-AC02-76SF00515
The LCLS-II is a CW X-ray FEL based on a 4 GeV superconducting RF linac that will upgrade the LCLS facility at the SLAC National Accelerator Laboratory. The upgrade is being constructed by a collaboration including ANL, Cornell, Fermilab, JLab, LBNL, and SLAC. This talk will describe the status of the LCLS-II project as well as the major technical issues and R&D to address them.
Presented on behalf of the LCLS-II collaboration

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WEP016

Free Electron Lasers in 2015

625

K. R. Cohn, J. Blau, W.B. Colson, J.W. Ng, M.J. Price
NPS, Monterey, California, USA

Funding: This work has been supported by the High Energy Laser Joint Technology Office.
Thirty-nine years after the first operation of the short wavelength free electron laser (FEL) at Stanford University, there continue to be many important experiments, proposed experiments, and user facilities around the world. Properties of FELs in the infrared, visible, UV, and x-ray wavelength regimes are tabulated and discussed.

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