Paper | Title | Other Keywords | Page |
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MO102 | The European XFEL SC Linac Project | linac, undulator, electron, radiation | 6 |
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The European XFEL project is entering the construction phase, based on the very successful experience of the TESLA linac technology and the SASE FEL concept, now serving the FLASH user facility at DESY. The EU-XFEL will be realized by a widespread international collaboration and it is also relevant for the ILC planning. A description of the overall layout of the facility, of the technical developments and industrialization efforts for the accelerator components, and of the international collaboration will be given. |
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MOP110 | Precise Control of Cooling Water System for Stabilization of 125 MeV Linac at LEBRA | linac, electron, klystron, target | 331 |
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The 125 MeV linac at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University has been used for generation of the near-infrared FEL and the Parametric X-ray Radiation (PXR). Currently the FELs from 0.86 to 6 microns and the PXR X-rays from 5 to 20 keV are available at LEBRA. Precise experiments using the light sources require a high stability in both the wavelength and the intensity of the lights. Though the linac was operated with the cooling water stabilized at 30 plus or minus 0.2 deg C, periodical fluctuation of the electron beam energy and the beam orbit suggested that the stability of the cooling water temperature was not sufficient. With this condition a large fluctuation (plus or minus 15%) was observed for the PXR intensity. After the improvement of the fine cooling water system and the water flow path, fluctuation of the cooling water temperature at the supply head of the accelerating tubes and the electromagnets was suppressed to within plus or minus 0.01 deg C. As a result of the improvement the PXR intensity fluctuation at the X-ray output port has been suppressed to within plus or minus 2% for the operation over several hours. |
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TUP031 | Normal Conducting Options for the UK's New Light Source Project | linac, klystron, emittance, cavity | 462 |
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A New Light Source project has been initiated to deliver a conceptual design for a next-generation light source facility in the UK. One option for such a light source is a free electron laser based on normal-conducting linac technology. This paper considers the different options available for waveband, gun and rf design of a normal-conducting linac FEL, and presents an overview of accelerating structure, modulator and klystron capability and availability. Particular attention is paid to the issue of the operation of a normal-conducting device at repetition rates of several hundred pulses per second. Overall capabilities and limitations of this approach are illustrated by reference to a start-to-end model of a suitable 3 GeV S-band linac design. |
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TUP038 | MIR-FEL with 4.5-Cell Thermionic RF-Gun | gun, electron, undulator, klystron | 477 |
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An MIR-FEL facility, Kyoto University FEL (KU-FEL), has been developed for applications in "sustainable energy science", such as fundamental studies on high-efficiency solar cells. The KU-FEL, consisting of an S-band thermionic rf gun, a 3 m accelerator tube and a planer undulator, aims to generate 4-13 μmeter tunable FEL. The first lasing was achieved on March, 2008 at 12.4 μmeters by using a beamloading compensation method both in the rf gun and in the accelerator tube. *Furthermore, we introduced detuning to the rf gun and succeeded to generate an electron beam with macropulse duration of 5.1 μseconds, average current of 100 mA and energy spread of 0.5% which led to power saturation in FEL. In the conference, the improvements of the electron beam properties and power saturation of the KU-FEL will be discussed. *H. Ohgaki et al., 'First Lasing at 12 um Mid Infrared Free Electron Laser at Kyoto University', Japanese Journal of Applied Physics, accepted for publication. (2008). |
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TUP039 | Status of the LINAC-800 Construction at JINR | electron, linac, acceleration, gun | 480 |
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800 MeV electron linac (LINAC-800) is under construction at JINR. It will be used as a driver for Volume FEL and as a test bench for commissioning of elements of the ILC. Presently the electron injector is commissioned and the electron beam of 50 keV of the energy at current of about 15 mA was obtained. The results of the injector operation at nominal parameters (400 keV, 300 mA) and commissioning of the first accelerating section at 20 MeV are discussed. |
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TUP040 | Linear Accelerator for the PSI-XFEL FEL3 Beamline | linac, emittance, gun, laser | 483 |
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In the planned PSI-XFEL facility, three FEL branches will supply coherent, ultra-bright, and ultra-short XFEL photons at wide wavelength range. FEL branch 1 will use a 6.0 GeV driving linac to generate hard X-rays from 0.1 nm to 0.3 nm, while FEL branch 2 is foreseen for X-rays from 0.3 nm to 1.0 nm. However, FEL branch 3 was designed to supply spatially as well as temporally coherent soft X-rays from 1.0 nm to 10 nm with the High-order Harmonic Generation based seeded HGHG scheme. To reach emittances of 0.2 mm.mrad and to squeeze consequently the whole facility within an 800 m long tunnel, PSI is presently developing an advanced low emittance gun (LEG) based on a 1 MV high gradient pulsed diode and field emission. The advanced LEG will be used to drive FEL branch 1 and 2, while an RF photoinjector will be used to drive the FEL branch 3. In this paper, we describe a CTF3 RF gun based injector, two bunch compressors, two diagnostic sections, and linacs for the PSI-XFEL FEL branch 3. |
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TUP041 | Superconducting Options for the UK's New Light Source Project | cryomodule, linac, SRF, cavity | 486 |
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The UK's new light source project was officially launched on April 11th 2007, which will be based on advanced conventional and free electron lasers, with unique and world leading capabilities. User consulation exercises have already been initiated to determine the fundamental photon output requirements for such a machine. In order to match a nominal requirement for high repetition rates (extending up to 1 MHz), a series of superconducting rf (SRF) linac options have been investigated, reflecting varied beam loading conditions and subsequent high and low power rf solutions. |
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TUP044 | The NPS-FEL Injector Upgrade | cathode, laser, gun, injection | 495 |
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Funding: This research is supported by the Office of Naval Research and the Joint Technology Office. |
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TUP046 | Linac Design for an Array of Soft X-Ray Free Electron Lasers | linac, electron, emittance, lattice | 501 |
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Funding: This work was supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 |
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TUP049 | The Electron Bunch Initial Energy Profile on a Seeded Free Electron Laser Performance | electron, undulator, free-electron-laser, laser | 509 |
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Funding: The work of AWC and JW was supported by the US Department of Energy under contract DE-AC02-76SF00515. The work of JB was supported by National Science Foundation Award No. DMR-0537588. |
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TUP052 | Status of the NPS Free-Electron Laser | electron, booster, undulator, laser | 518 |
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Funding: This research is supported by the Office of Naval Research and the Joint Technology Office. |
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TUP069 | Low Energy Photoemission Electron Source for Applications in THz Radiation Production and Time-Resolved Electron Microscopy | electron, laser, cathode, radiation | 554 |
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Funding: Work supported by the Department of Education under contract P116Z010035 with Northern Illinois University. |
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TUP089 | Electron Beam Timing Jitter and Energy Modulation Measurements at the JLab ERL | electron, wiggler, instrumentation, cavity | 606 |
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When operating JLab high current ERL a strong reduction of the FEL efficiency was observed when increasing the average electron beam current. Investigating the FEL efficiency drop-off with the electron beam average current we also have measured the electron beam phase noise and the fast energy modulations. The so-called phase noise is essentially a variation of the time arrival of the electron bunches to the wiggler. That could be a very effective way of reducing the FEL efficiency if one takes in to account that the accelerator is routinely operated with the RMS bunch length of about 150 fs. Under a fast energy modulation we mean a modulation which can not be followed by the FEL due to its time constant, defined by the net gain. Such a modulation also could be a possible cause of the efficiency drop-off. Having the measurements made we could rule out the FEL efficiency drop-off due to either the fast energy modulation or the phase modulation. We also have learned a lot about instrumentation and techniques necessary for this kind of beam study. In this contribution we describe the used instrumentation and present results of the measurements. |
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TUP093 | Activities on High Brightness Photo-injectors at the Frascati Laboratories, Italy | linac, emittance, laser, radiation | 618 |
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Funding: Work partially supported by the EU Commission in the sixth framework program. Contract No. 011935 EUROFEL and MIUR(Research Department of Italian Government). |
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TUP105 | Simulation of the Upgraded Photoinjector for the 10 kW JLAB IR-FEL | laser, emittance, simulation, cavity | 649 |
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Funding: Work supported by the Department of Defense under contract N00014-06-1-0587 with Northern Illinois University |
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TUP106 | Simulation of Field-Emission Cathodes for High Current Electron Injectors | cathode, electron, simulation, gun | 652 |
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Funding: Work supported by the Department of Defense under contract N00014-06-1-0587 with Northern Illinois University |
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TUP108 | Initial RF Measurements of the CW Normal-Conducting RF Injector | cavity, coupling, vacuum, cathode | 656 |
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Funding: This work is supported by ONR and HEL-JTO. |
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TUP110 | Modeling of a Low Frequency SRF Electron Gun for the Wisconsin FEL | emittance, gun, cavity, cathode | 658 |
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Funding: This work is supported by the University of Wisconsin-Madison and MIT, and by the US NSF under award No. DMR-0537588 * O.J. Luiten, et al., Phys. Rev. Lett., 93, 094802-1 (2004) |
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FR101 | 8-GeV C-Band Accelerator Construction for XFEL/SPring-8 | klystron, high-voltage, cavity, electron | 1090 |
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The 8 GeV C-band electron linear accelerator is under construction at the SPring-8 site aiming at generating an FEL X-ray beam in 2010. C-band accelerator technology has been developed initially at KEK for the e+e- linear collider project, and employed at the XFEL project in Japan. Since C-band generates a high gradient acceleration field as high as 35 MV/m, the total length of the accelerator fits within 400 m, including the injector and three bunch compressors. C-band uses normal conducting rf technology, thus it runs in pulse mode at 60 Hz, which is well suited to XFEL operation and is less expensive. The talk will cover the current status of the XFEL project and hardware production. |
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FR102 | Commissioning of the LCLS Linac | emittance, laser, linac, electron | 1095 |
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Funding: This work was supported by U.S. Department of Energy, Office of Basic Energy Sciences, under Contract DE-AC02-76SF00515 |
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FR103 | Operation of FLASH as an FEL User Facility | electron, radiation, photon, gun | 1100 |
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FLASH, the FEL user facility at DESY, is operated with an electron beam energy up to 1 GeV corresponding to a photon wavelength down to 6.5 nm. The full year 2008 is dedicated to beam operation: about half of the time is scheduled for FEL users, and the rest for accelerator and FEL physics studies. Operational experience gathered at FLASH is very important not only for further improvements of the FLASH facility itself, but also for the European XFEL and for the ILC R&D effort. This talk reports our experience operating FLASH as a user facility. Failure statistics are included as well. |
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FR105 | Billion Particle Linac Simulations for Future Light Sources | linac, electron, simulation, space-charge | 1110 |
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Funding: This work was supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC03-76SF00098. |
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