Synchrotron radiation sources and FELs
Paper Title Page
THXCH01 MARS: Fourth Generation X-Ray Light Source Based on Multiturn Energy-Recovery Linac 123
 
  • G.N. Kulipanov, Ya.V. Getmanov, O.A. Shevchenko, A.N. Skrinsky, N. Vinokurov
    BINP SB RAS, Novosibirsk, Russia
  • V. Korchuganov
    RRC, Moscow, Russia
  • M.V. Kovalchuk
    NRC, Moscow, Russia
  
  In the recent years, Russian government and scientific society have been coming gradually to an understanding the way of development science in Russia. Government have accepted a program of building six mega-science projects, and one of them can be a new 4-th generation x-ray light source based on accelerator-recuperator. Multiturn energy recovery linacs (ERL) looks very promising for making modern synchrotron radiation sources, being less expensive and more flexible. At this time only one multiturn ERL exists. This Novosibirsk ERL operates with two orbits and two free electron lasers based on one linac now. The conception of Multiturn Accelerator-recuperator Radiation Source (MARS) was proposed in 1997 by G.N. Kulipanov, A.N. Skrinsky and N.A. Vinokurov. The use of the ERL with two separated accelerating structures allows to exclude main disadvantages of scheme with one linac, such as the pass of electron bunches with different energies through the same magnetic arcs. The feasibility study for such ERL-based high brightness x-ray source is presented.  
slides icon Slides THXCH01 [2.385 MB]  
 
THXCH02 The Development of Synchrotron Radiation Source of NRC "Kurchatov Institute" 126
 
  • V. Korchuganov, A. Belkov, Y.A. Fomin, E.V. Kaportsev, G.A. Kovachev, M.V. Kovalchuk, Y.V. Krylov, K. Kuznetsov, V.V. Kvardakov, V.V. Leonov, V.I. Moiseev, V.P. Moryakov, K. Moseev, N.I. Moseiko, D.G. Odintsov, S.G. Pesterev, Yu.F. Tarasov, S.I. Tomin, V. Ushkov, A.G. Valentinov, A. Vernov, Y.L. Yupinov, A.V. Zabelin
    NRC, Moscow, Russia
  
  Russia's first dedicated SR source based on electron storage ring Siberia-2 entered service in late 1999, Kurchatov Institute, Moscow. The report focuses on the consumer parameters of an electron beam and the further development of actual SR source, SR beam lines and experimental stations in 2012.  
slides icon Slides THXCH02 [5.459 MB]  
 
THXCH03 Current FEL Physics Research at SLAC 131
 
  • G.V. Stupakov
    SLAC, Menlo Park, California, USA
  
  Funding: Work is supported by Department of Energy contract DE-AC02-76SF00515
SLAC is a home of the first hard x-ray free electron laser - the Linac Coherent Light Source, or LCLS, based on Self-Amplified Stimulated Emission (SASE) principle. Being a user facility, LCLS, as well as some other installations at SLAC, are, at the same time, test beds of research aimed to improving fundamental characteristics of free electron lasers. In this presentation I will review results of some of these studies. They include studies of the FEL seeding based on the Echo-Enabled Harmonic Generation (EEGH) carried out at the NLCTA facility at SLAC, hard x-ray self seeding at LCLS, noise suppression experiments, and research aimed to achieve terawatt-scale power in FELs. A brief review of the plans for LCLS upgrade will be given. 		 
slides icon Slides THXCH03 [10.105 MB]  
 
THXCH04 Budker INP Free Electron Laser Facility – Current Status and Future Prospects 136
 
  • O.A. Shevchenko, V.S. Arbuzov, K.N. Chernov, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, E.I. Gorniker, B.A. Knyazev, E.I. Kolobanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, L.E. Medvedev, L.A. Mironenko, V.K. Ovchar, B.Z. Persov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, G.V. Serdobintsev, S.S. Serednyakov, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, N. Vinokurov, M.G. Vlasenko, P. Vobly, V. Volkov
    BINP SB RAS, Novosibirsk, Russia
  
  The free electron laser (FEL) facility at Budker INP is being developed for more than 15 years. It is based on the normal conducting CW energy recovery linac (ERL) with rather complicated magnetic system lattice. Up to now it is the only one in the world multiorbit ERL. It can operate in three different regimes providing electron beam for three different FELs. Its commissioning was naturally divided in three stages. The first stage ERL includes only one orbit placed in vertical plane. It serves as electron beam source for terahertz FEL which started working for users in 2003. Radiation of this FEL is used by several groups of scientists including biologists, chemists and physicists. Its high peak and average powers are utilized in experiments on material ablation and biological objects modification. The second stage ERL is composed of two orbits located in horizontal plane. The second stage FEL is installed on the bypass of the second orbit. The first lasing of this FEL was achieved in 2009. The last stage ERL will include four orbits. Its commissioning is in progress now. In this paper we report the latest results obtained from the operating FELs as well as our progress with the commissioning of the two remaining ERL beamlines. We also discuss possible options for the future upgrade.  
slides icon Slides THXCH04 [5.360 MB]  
 
THACH01 Indirect Cooled Superconductive Wiggler Magnet 140
 
  • K. Zolotarev
    BINP SB RAS, Novosibirsk, Russia
  
  Superconducting wigglers are very popular devices for generation of the synchrotron radiation in the hard X-ray spectral range. The one direction of the future progress in wigglers development is reducing of the technical complexity wigglers design as well as technical service for cryogenic system. The BINP wigglers without liquid helium consumption were a noticeable milestone of these efforts. The next significant step toward additional simplification wiggler design and service is indirect cooling of the wiggler magnet. In this case the wiggler magnet not sinked into the liquid helium, but cooled by thermal connection link with the head of cryogenic cooler. This approach is used for design of the indirect cooled wiggler for IMAGE beamline on the ANKA light source (KIT, Germany). This wiggler also will be tested as a prototype for damping wiggler for the damping rings in the project of the Compact Linear Collider (CLIC) for CERN. This report summarizes some details of the wiggler design as well as a result of the short prototype testing.  
slides icon Slides THACH01 [3.073 MB]  
 
THACH02
 Generation of High-Energy Photons with Large Orbital Angular Momentum  
 
  • V.G. Serbo
    NSU, Novosibirsk, Russia
  
  Usually, photons are described by plane waves with a definite 4-momentum. In addition to plane-wave photons, "twisted photons" have recently entered the field of modern laser optics; these are coherent superpositions of plane waves with a defined projection (h/2p) m of the orbital angular momentum onto the propagation axis, where m is integer. An experimental realization exists for states with projections as large as m = 200. In recent papers we had shown that it is possible to produce high-energy twisted photons by Compton backscattering of twisted laser photons off ultra-relativistic electrons. Such photons may be of interest for experiments in atomic and nuclear physics in previously unexplored experimental regimes.
* U. Jentschura, V. Serbo. Phys. Review Letters 106 (2011) 013001
** U. Jentschura, V. Serbo. European Phys. Journal C 71 (2011) 1571
*** I. Ivanov, V. Serbo. Phys. Review A 84 (2011) 033804. 		 
slides icon Slides THACH02 [1.120 MB]  
 
WEPPD001
 The CAEP Superconducting Linac Based THz-FEL  
 
  • H.B. Wang, M. Li, X. Yang
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  
  Funding: Funding agency: the ministry of science and technology of the People's Republic of China; Contract:2011YQ130018
A FEL-based THz source is now under construction in CAEP. It will provide average power 10 W output in a frequency of 1 THz - 3 THz. The FEL will be driven by a 6 MeV - 8 MeV, 1 mA - 5 mA CW superconducting RF linac, consists of a 300keV DC photocathode gun and two 4-cell superconducting RF cavities, along with a buncher cavity. Due to the FEL’s stringent requirements, the beam dynamics should be the focus of design. In this paper, the physics design and simulated performance of beam line are described. 		 
 
WEPPD002 Simulations and Design of THz Wiggler for 15-40 MeV FEL 569
 
  • E. Syresin, S.A. Kostromin, R.S. Makarov, N.A. Morozov, D. Petrov
    JINR, Dubna, Moscow Region, Russia
  
  The electromagnetic wiggler is applied for narrow-band THz radiation in the 30 mkm to 9.35 mm wavelength range. This is a planar electromagnetic device with 6 regular periods, each 30 cm long. The end termination pattern structure is +1/4,-3/4,+1,…,- 1,+3/4,-1/4. This structure is more appreciable for compensation of the first and second fields, especially, to provide the small value of of second integral of 500 G*cm2. The peak magnetic field is up to 0.356 T, it is defined by large wiggler gap of 102 mm and available capacity of water cooling system of 70 kW. The parameter is varied in the range K=0.5-7.12 corresponding to a field range B=0.025-0.356 T peak field on axis. The wiggler is used in 15-40 MeV at beam currents up to 1.6 mA. The bunch compression scheme allows the whole wavelength range to be covered by super-radiant emission with a sufficient form factor. The wavelength range corresponds to 217 mkm - 9.35 mm at electron energy of 15 MeV, it is equal to 54 mkm - 2.3 mm at electron energy of 30 MeV and it is 30 mkm - 1.33 mm at electron energy of 40 MeV. The 3D Opera simulations and design of THz wiggler is under discussion.  
 
WEPPD003 Diagnostic Technique with Femtosecond Resolution Applied for FEL Electron Bunches 572
 
  • E. Syresin, A.Yu. Grebentsov, R.S. Makarov, N.A. Morozov, M.V. Yurkov
    JINR, Dubna, Moscow Region, Russia
  • O.I. Brovko, A.V. Shabunov
    JINR/VBLHEP, Moscow, Russia
  
  Diagnostic technique applied for FEL ultrashort electron bunches is developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort electron bunches are based on calorimetric measurements and detection of undulator radiation. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. The pump probe experiments with VUV and FIR undulators provide the bunch profile measurements with resolution of several femtosecond. The MCP based radiation detectors are effectively used at FLASH for VUV pulse energy measurements. The new three MCP detectors operated in X-ray range are under development now in JINR for SASE1-SASE 3 XFEL.  
 
WEPPD004 Longitudinal Stability of ERL with Two Accelerating RF Structures 575
 
  • Ya.V. Getmanov, O.A. Shevchenko
    BINP SB RAS, Novosibirsk, Russia
  • N. Vinokurov
    KAERI, Daejon, Republic of Korea
  
  Modern Energy Recovery Linac (ERL) projects use superconductive accelerating radio-frequency structures (RF). Their RF quality is typically very high. Therefore, the RF voltage induced by electron beam is also high. In ERL the RF voltage induced by the accelerating beam is almost cancelled by the RF voltage induced by the decelerating beam. But, a small variation of the RF voltage may cause the deviations of the accelerating phases. These deviations then may cause further voltage variation. Thus, the system may be unstable. The stability conditions for ERL with one accelerating structure are well known. The ERL with split RF structure was discussed recently. The stability conditions for such ERLs are discussed in this paper  
 
WEPPD005
 Properties of Radiation from the European XFEL Undulator Prototype  
 
  • S.I. Tomin, N.V. Smolyakov
    NRC, Moscow, Russia
  • G. Geloni, J. Pflüger
    European XFEL GmbH, Hamburg, Germany
  
  Funding: The program "Physics with Accelerators and Reactors in West Europe (except CERN)"
In this contribution, we present an analysis of the experimentally measured magnetic field data from the planar hybrid 48 mm period undulator prototype for the European XFEL, and a simulation of expected radiation properties. Because of manufacturing errors, the magnetic field data include a small horizontal component, as well as some irregularities. A Fourier harmonics analysis was carried out. It was found that the vertical component of the measured magnetic field includes a sufficiently noticeable (about 10 percent relative to the fundamental) third harmonic component in addition to the fundamental harmonic. The radiation Stokes parameters are simulated from the experimentally measured magnetic field. Relying on computed radiation distributions, the effective magnetic field amplitude, the effective undulator period and deflection parameter are calculated. Simulations show that the intensity of the fundamental harmonic along the undulator axis is higher compared to the corresponding radiation intensity in the case of an ideal, purely sinusoidal magnetic field. The origin of this effect is analyzed. 		 
 
WEPPD006
 Analytical and Numerical Analysis of Electron Trajectories in a 3-D Undulator Magnetic Field  
 
  • N.V. Smolyakov, S.I. Tomin
    NRC, Moscow, Russia
  • G. Geloni
    European XFEL GmbH, Hamburg, Germany
  
  Funding: Programm: Physics with accelerators and reactors in West Europe (except CERN)
In this contribution we present an analysis of electron trajectories in the three dimensional magnetic field from a planar undulator. The electron trajectory is influenced by the focusing properties of the undulator field. In the European XFEL case, long segmented undulators (21 segments for the SASE3 beamline to 35 for SASE1 and SASE2) are planned to be installed, with quadrupole lenses between different segments. These focusing properties should be taken into account in simulations of spontaneous radiation, which constitutes the background signal of the FEL. The ideal magnetic field of an undulator can be described, in agreement with Maxwell equations, by a sinusoidal vertical magnetic field on the undulator axis, and by horizontal and longitudinal field components that appear out of axis. Exploiting this description for the ideal case, an experimentally measured magnetic field are accounted for by solving the differential equations of motion solved by means of a perturbation theory approach, and the corresponding expressions for the electrons velocities and trajectories are derived. The electrons trajectories for the experimentally measured magnetic field where also simulated numerically. To that aim, a computer code was written, which relies on the Runge-Kutta algorithm. The analytical and numerical methods could then be compared, showing a good agreement. 		 
 
WEPPD007 Vertical Size of an Electron Beam at Siberia-2 578
 
  • A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov
    NRC, Moscow, Russia
  
  Brightness of the synchrotron radiation light sources is defined by electron beam sizes at radiation point. Horizontal size depends mainly from designed magnetic structure. Vertical size is defined by two processes: first, betatron coupling between vertical and horizontal motions and second, presence of vertical dispersion function at bending magnets. Vertical dispersion creates non-zero vertical emittance even without coupling. The report is dedicated to methods of vertical beam size decreasing at Siberia-2 storage ring. There are two families of skew-quadrupoles on the ring, one lens of every family in each of 6 cells of the magnetic structure. After analyzing of betatron coupling coefficient equation we stayed only two lenses in each family. As a result family currents for coupling compensation became much lower. In order to decrease vertical dispersion a special algorithm was developed and tested. Vertical dispersion on BPM azimuths was corrected by vertical displacements of sextupoles for chromaticity compensation. Maximal value of the dispersion became four times lower. It leaded to prominent vertical beam size decreasing.  
 
WEPPD008 Energy Ramping at Siberia-2 581
 
  • A.G. Valentinov, V. Korchuganov, Y.V. Krylov, Y.L. Yupinov
    NRC, Moscow, Russia
  
  Siberia-2 storage ring has great difference between injection energy 0.45 GeV and working energy 2.5 GeV. Beam lifetime at injection energy is equal to approximately 1 hour. In order to minimize beam losses of the stored beam it is necessary to accelerate energy ramping process. It is not very simple because power supplies of bending magnets, quadrupole lenses and sextupoles have different response time and behavior after changes in regulated current level. Magnetic elements are manufactured from non-laminated iron. It leads to slower field/gradient increasing at high current values. Complicated algorithm with 9 intermediate regimes (collections of power supplies' settings) was developed to produce fast and efficient energy ramping. First, correction of closed orbit, betatron tunes and chromaticity is accomplished in each regime in static conditions. Special file is used to provide acceleration or deceleration of power supplies in dynamic conditions. This scheme allows to compensate betatron tune shifts during energy ramping. Power supplies are not stopped on intermediate regimes; speed of current changing is continuous function of time. This algorithm allowed decreasing ramping time down to 2 minutes 40 seconds. Beam losses are not exceeding 2 – 3%; betatron tune shifts as a rule are lower than 0.01. The algorithm can easily be modified to stop in any intermediate regime.  
 
WEPPD009 Measurement of Speed of Light Emitted by Ultrarelativistic Source 584
 
  • A. Stirin, P. Aleksandrov, V. Korchuganov
    NRC, Moscow, Russia
  • E.B. Aleksandrov
    IOFFE, St. Petersburg, Russia
  • V.S. Zapasskii
    Saint-Petersburg State University, Saint-Petersburg, Russia
  
  Funding: The work was supported by the Russian Fundation for Basic Research under Project No.11-02-00538-а.
The paper focuses on the results of experiments on direct measurement of speed of the light emitted by an ultrarelativistic source. The source of synchrotron radiation (SR), Siberia-1 electron storage ring at Kurchatov Institute, was used as a pulsed source of light. Experiments were made on the visible part of the SR emitted by ultrarelativistic electron bunch moving along a curved trajectory in the magnetic field of the bending magnet. The measured value of speed of the light pulse in vacuum coincided with the tabular value of the light speed within 0.5%. Results of the measurements support the second postulate of Einstein's special theory of relativity about independence of speed of light from the source velocity. The paper contains schematic of the experiment, description of its components, main parameters of Siberia-1 electron storage ring and electron bunches. Description of the method of direct measurement of light speed as well as experimental oscillograms and calculation data are also presented. 		 
 
WEPPD010 Study of Two Cavities Accelerating Module at SR Source Siberia-2 587
 
  • V.I. Moiseev, V. Korchuganov, A.S. Smygacheva, A. Vernov
    NRC, Moscow, Russia
  
  SR source Siberia-2 RF system includes an accelerating module consisting of two 181 MHz cavities powered by one amplifier. Some problem occured now is the accelerating voltage instubility under high beam currents conditions. The phase shift between the voltages at cavities causes the asymmetry in beam loading and detuning of cavities. To study the performances of accelerating module, the analytical description has been developed. The whole system can be characterized by seven parameters. These base parameters give the relations of voltages and currents in system. Measurements determine the real values of the base parameters. Set of non linear equations recived can be reduced to the voltages and currents in system as the functions of beam current and energy. The results can be applied to injection and ramping in Siberia-2.  
 
WEPPD011
 The Possibilities of a Shadow Mask Application for the Systems of SR Beam Stabilization  
 
  • M.G. Fedotov
    BINP SB RAS, Novosibirsk, Russia
  • M.G. Fedotov
    NSU, Novosibirsk, Russia
  
  The stabilization systems of synchrotron radiation (SR) beam position based on recording of optical images from luminescent screens by multielement photodetectors (CCDs, CMOS-sensors) are considered. Limit of stabilization accuracy (the noise of position measurement) of these systems is defined by both the noise of detector readout and the capacity of detector cells (that defined the quantum noise level of image). In the case of stabilization of one fixed position the additional screen (shadow mask), blocking or weakening part of SR beam, can be used. It is shown that application of the shadow mask can increase the limit of stabilization accuracy. In addition, in certain geometry the shadow mask can operate as a zero-organ (reducing the contribution of some sources of drifts) or to ensure the simultaneous stabilization of beam position and angle using only one detector.  
 
WEPPD012 Standing Wave RF Deflectors with Reduced Aberrations 590
 
  • V.V. Paramonov, L.V. Kravchuk, P. Orlov
    RAS/INR, Moscow, Russia
  • K. Flöttmann
    DESY, Hamburg, Germany
  
  Funding: in part RBFR N 12-02-00654-a
Deflecting structures are now widely used for bunch phase space manipulations either with bunch rotation for special bunch diagnostic or in emittance exchange experiments. Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide non linear additives in the field distribution, leading to emittance growth during phase space manipulation. Standing wave operation is more RF efficient for short deflectors. The criterion of the field quality estimation and results is of deflecting structure consideration for minimization of non linear additives are presented. The solutions for dispersion correction together with end cells optimization are described too. 		 
 
WEPPD013 Inverse Compton Sources on the Basis of Electron Accelerators with Beam Energy Recovery 593
 
  • V.G. Kurakin, P.V. Kurakin
    LPI, Moscow, Russia
  
  In inverse Compton Source, photons in Roentgen range originate from visible light laser photons scattered back on electrons with the energy of dozens MeV. Several schemes are suggested in the paper, beam energy recovery conception being the common idea of all of them. The first one is based on synchrotron with flat part of guiding magnetic field. Being accelerated, electron bunch interacts with photon bunch of free electron laser mounted on straight paths of the accelerator, then is decelerated during falling down period of magnetic field cycle, and extracted at low energy from synchrotron to absorb in beam dump. This measure decreases background that originates from bremsstrahlung of lost electrons inherent to classical schema with linear accelerator and storage ring. Two other schemes use superconducting linac that produces relativistic electron bunches which energy is recovered after use, free electron laser (FEL) driven by bunches from linac being used to produce photons bunches for source. In one scheme the same electron bunches are use to drive FEL and inverse Compton Source, while in the other one beam splitting technique is suggested. It is based on beam energy modulation with subsequent separation of successive bunches. The expected self excitation inverse Compton sources parameters are estimated followed by critical issues discussion for all schemes suggested.  
 
WEPPD014
 Undulator Radiation inside a Dielectric Waveguide  
 
  • A. Kotanjyan, A.A. Saharian
    YSU, Yerevan, Armenia
  
  We investigate the radiation from a charge moving along a helix around a dielectric cylinder immersed in a homogeneous medium. The radiation intensity for the modes propagating inside the cylinder is evaluated by the work done by the radiation field on the charge and by evaluating the energy flux through the cross-section of the cylinder. We investigate the relative contributions of the bound modes and the modes propagating at large distances from the cylinder to the total radiation intensity. It is shown that the presence of the cylinder can lead to the considerable increase of the radiation intensity. The insertion of a dielectric waveguide provides an additional mechanism for tuning the characteristics of the undulator radiation by choosing the parameters of the waveguide. The radiated energy inside the cylinder is redistributed among the cylinder modes and, as a result, the corresponding spectrum differs significantly from the homogeneous medium or free-space results. This change is of special interest in the low-frequency range where the distribution of the radiation energy among small number of modes leads to the enhancement of the spectral density for the radiation intensity. The radiation emitted on the waveguide modes propagates inside the cylinder and the waveguide serves as a natural collector for the radiation.  
 
WEPPD017
 Closed Orbit Correction in the ILSF Storage Ring  
 
  • H. Ghasem
    IPM, Tehran, Iran
  • E. Ahmadi, F. Saeidi
    ILSF, Tehran, Iran
  • D. Einfeld
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  Several corrector magnets have been distributed in designed storage ring lattice of ILSF to correct the distorted closed orbit due to errors. Moreover, beam position monitors (BPM) located at the straight sections and between the magnets are used to observe the orbit correction. This paper gives results of closed orbit correction in ILSF and stipulates the strength of correctors.  
 
WEPPD018
 Design of Transfer Lines for the ILSF Accelerator Complex  
 
  • H. Ghasem
    IPM, Tehran, Iran
  • E. Ahmadi, F. Saeidi
    ILSF, Tehran, Iran
  • D. Einfeld
    CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
  
  There are two transfer lines (T-lines) which link the Iranian Light Source Faclity (ILSF) accelerator complex to gather. Several criterias have been considered in design of the T-lines. This paper gives linear optimization results of the designed T-lines based on the first layout of the ILSF.  
 
WEPPD019
 ILSF, a 3rd Generation Light Source Laboratory in Iran  
 
  • J. Rahighi, E. Salimi
    IPM, Tehran, Iran
  • H. Ghasem, Kh.S. Sarhadi
    ILSF, Tehran, Iran
  
  The Iranian Light Source Facility Project (ILSF) is a first large scale accelerator which is currently under planning in Iran. The circumference of the storage ring is 297.6 m with the energy of 3 GeV, the beam current of 400 mA and the natural emittance of 3.3 nmrad with an overall of 32 straight sections of different lengths. A full energy booster has been designed to accelerate the 150 MeV electron beam, extracted from the linac, to the final energy of 3GeV. The facility will be built on a land of 100 hectares area in the city of Qazvin, located 150 km West of Tehran. The city is surrounded by many universities, research centers and industrial companies. The design and construction of prototype items such as radio frequency solid state amplifier, dipole magnets, highly stable magnet power supplies and girders have already begun. Site selection studies, including geotechnical and seismological measurements are being performed. Conceptual Design Report (CDR) as the first milestone of the project will be completed and will be accessible on the project website by the end of July 2012.  
 
WEPPD020 Helical 1Tx1cm Pulsed Insertion Devices for Production of Intense Polarized X- & Gamma-rays 596
 
  • A.V. Smirnov
    RadiaBeam, Santa Monica, USA
  
  Two types of high-field, pulse undulators are revisited as non-coherent or partially coherent sources capable of undulator factor approaching unity at substantial gap-to-period ratios exceeding 0.4 that cannot be achieved with conventional technology. One type is a microwave square-guide, cross-polarized undulator system fed by high-power wake-fields extracted with CLIC type scheme adapted for that 2-beam undulator. Another novel ID is represented here by a bifilar transmission line energized by a high voltage, ~ns-pulse, solid-state generator. These undulators fit well radiation facilities and future linear colliders based on high-gradient microwave linac technology.