Paper | Title | Other Keywords | Page |
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MO102 | The European XFEL SC Linac Project | linac, FEL, undulator, electron | 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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MOP050 | Development of Investigations on the MILAC Heavy Ion Linear Accelerator | ion, heavy-ion, proton, acceleration | 187 |
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Experiments with heavy ion beams accelerated to an energy of 8.5 MeV/u as well as the work at developing new methods of acceleration and upgrading of accelerating structures are carried on at the Kharkov heavy-ion linear accelerator MILAC. The accelerating H-type structure with drift tubes of interdigital type (IH-structure) has been introduced in the main section and two pre-stripping sections of the MILAC accelerator. New original methods of tuning developed at MILAC have enabled the formation of uniform distribution of the accelerating field along the whole length of the accelerating structure. The introduction of IH accelerating structures of various modifications at the MILAC accelerator substantially extends the scientific and applied ranges of research. It involves experimental studies with heavy ions beams for production of track-etched membranes, generation of unique radionuclides, developments of proton and ion therapy, studies of radiation characteristics of constructional materials for nuclear engineering, investigations into the processes of fusion-fission of superheavy nuclei, and many other problems of nuclear physics. |
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MOP113 | The Dual Axis Radiographic Hydrodynamic Test (DARHT) Facility Personnel Safety System (PSS) Control System | controls, interlocks, status, monitoring | 340 |
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Funding: This work supported by the US National Nuclear Security Agency and the US Department of Energy under contract DE-AC52-06NA25396 |
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TUP017 | Design of the Tail Clipper Collimator for CTF3 | collimation, quadrupole, shielding, photon | 425 |
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The CERN CLIC test facility (CTF3) aims at assessing the feasibility of the future multi-TeV Compact Linear Collider (CLIC). The CTF3 Tail Clipper Collimator (TCC) will serve to adjust the bunch train length of the beam extracted from the combiner ring, in combination with a fast kicker magnet. In addition, the TCC will operate, when required, as an internal beam dump. The challenge of the TCC design is to meet the requirements of both collimator and dump operational modes for a low energy e- beam (100-300 MeV) of 35 A peak intensity. The TCC collimator will be installed at the end of 2008 in the TL2 transfer line of CTF3. This paper describes the final design of the TCC and the main issues related to its integration in the line. |
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TUP023 | Optimization of Lattice for an ERL Upgrade to the Advanced Photon Source | emittance, brightness, lattice, optics | 441 |
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Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. |
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TUP026 | Exploring Benefits of Using RF Deflection for Short X-Ray Pulse Generation for an Energy-Recovery Linac Upgrade to the Advanced Photon Source | undulator, photon, cavity, emittance | 447 |
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Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. *A. Zholents, et al., Nucl. Instr. and Meth. A 425 (1999) 385. |
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TUP029 | Electron Linac Based Coherent Radiation Light Source Project at OPU | electron, linac, synchrotron, gun | 456 |
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The coherent synchrotron and transition radiation from electron bunches of a linear accelerator (linac) has continuous spectra in a submillimeter to millimeter wavelength range at relatively high peak-intensities. This light source has been applied to absorption spectroscopy by the authors for various kinds of matters with relatively strong light absorbance such as water and aqueous solutions. The other important characteristics of the coherent radiation are picosecond pulsed light and the high peak intensity of the electric field which can be introduced into matters. In our new project the light source using the pulsed coherent synchrotron and transition radiation will be developed by using the electron beams of a 18 MeV S-band electron linac at Osaka Prefecture University (OPU). The pulse shape of the radiation has been evaluated from the shape of the electron bunch. The system of the light source has been optimized and is under construction. The light source will be applied to the pulsed excitation of matters and to the pump-probe experiment using the electron beam and the coherent radiation. |
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TUP043 | Development of a Beam Loss Monitor System for the LCLS Undulator Beamline | undulator, electron, beam-losses, simulation | 492 |
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Funding: Work Argonne supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02-06CH11357. |
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TUP047 | Manipulating the Two-Stream Instability for Efficient Terahertz Generation | electron, bunching, coupling, simulation | 504 |
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Particle beams have exhibited a two-stream instability for many decades; this undesirable trait has been well-understood for many years. We propose creating a scheme that uses a beam of electrons with two distinct energies that will develop the two-stream instability as a bunching mechanism. By controlling the beam parameters and seeding them with a low-level rf signal, a gain as high as 2.5 dB per centimeter is predicted. We show the theory behind this concept and recent progress in a developing experiment. |
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TUP051 | Design of Microwave Undulator Cavity | undulator, cavity, electron, synchrotron | 515 |
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Static magnetic field undulators are capable of producing quasi-monochromatic synchrotron radiation of very high brightness. However, it is not possible to quickly change the properties such as polarization of the radiation in a static undulator. It is possible to construct an undulator using microwaves instead of static magnets where the electron beam is undulated by both electric and magnetic fields of an rf wave. A major advantage with a microwave undulator is that the radiation properties can be changed very quickly. The biggest challenge in developing a microwave undulator is in keeping the rf losses low. We are designing a microwave undulator with the aim of achieving at least a tenth of the flux obtained by the BL13 static magnetic field Elliptical Polarized Undulator in the SPEAR ring. We have considered circular waveguide modes and hybrid HE11 mode in a corrugated waveguide as possible candidates for the microwave undulator. It is found that a corrugated waveguide has the lowest rf losses with a very desirable field profile. It is also possible to use this device for a linac driven FEL. Our analysis of the corrugated waveguide cavity for the rf undulator will be presented. |
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TUP063 | Development of a New Highly Bright X-ray Generator | electron, brightness, target, synchrotron | 539 |
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A new type of rotating anticathode X-ray generator has been developed, in which the electron beam irradiates the inner surface of a U-shaped anticathode. A high-flux electron beam is focused on the inner surface by optimizing the shape of the bending magnet. In order to minimize the sizes of the X-ray source, the electron beam is focused strongly in a short distance by the bending magnet which is small and is close to the rotating anticathode. The power of the electron beam can be increased to the point at which the irradiated part of the inner surface is melted, because a strong centrifugal force fixes the melted part on the inner surface. We have achieved emission of X-rays 10 times more brilliant than can be attained by a conventional rotating anticathode. The development is still in progress. New results will be reported in detail. |
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TUP064 | Nuclear Reaction Analysis by Using Quasi-Elastic Scattering of Ultra Low Intensity Electron Beams | electron, neutron, target, scattering | 542 |
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Energetic electron beams higher than several MeV occasionally induce direct nuclear reactions with the target nuclei. These processes are attributed to the quasi-elastic scattering of electrons (e,e') with the target nuclei and similar to the photo-nuclear reactions. These reactions are considered to be useful for the non-destructive analysis of heavy elements such as U and Th. In addition, a two-dimensional analysis is realized only by scanning of electron beam. On the other hand, the huge X-ray burst caused by the bremsstrahlung with the electron pulse bombardment is the most harmful phenomenon for the radiation measurement system. In this study, an ultra low intensity electron beam was used for relieving the problem, which has been developed by modifying an electron linear accelerator. The minimum beam charge about several aC/pulse has been achieved at the present. Consequently, the neutron emitted by Pb(e,e'n)Pb reaction was measured successfully by the use of the low intensity beams. The linearity between the neutron count and the concentration of Pb in the target was verified experimentally. |
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TUP069 | Low Energy Photoemission Electron Source for Applications in THz Radiation Production and Time-Resolved Electron Microscopy | electron, laser, cathode, FEL | 554 |
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Funding: Work supported by the Department of Education under contract P116Z010035 with Northern Illinois University. |
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TUP076 | Design of a Beam Halo Monitor with a High Dynamic Range | laser, photon, storage-ring, controls | 570 |
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A thorough understanding of halo formation and its possible control is highly desirable for essentially all particle accelerators. Limiting the number of particles in the halo region of a beam would allow for minimizing beam losses and maximizing beam transmission, i.e. the experimental output. Measurements based on either optical transition radiation (OTR) or synchrotron radiation (SR) provide an interesting opportunity for high dynamic range measurements of the transverse beam profile, since the signal is linear with the beam charge over a wide range and is routinely used in many diagnostic applications. In this contribution, first results on beam halo measurements obtained from a flexible core masking technique and an innovative CID camera system are summarized. |
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TUP079 | Operational Performance of a New Beam-Charge Interlock System for Radiation Safety at the KEKB Injector Linac | injection, linac, controls, positron | 579 |
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A new beam-charge interlock system has been developed for radiation safety and machine protection at the KEKB injector linac. Although the previous software-based interlock system was working, it was replaced by the new hardware-based one. The new interlock system restricts the integrated amount of beam charges delivered to four different storage rings (KEKB e+, KEKB e-, PF, PF-AR) at six locations along the linac. When the integrated amount of beam charges exceeds a certain threshold level prescribed at each location, the beam-abort requests are directly sent through a twisted hardwire cable to the safety control system of the linac. The new interlock system boosted its reliability in comparison with the previous system. The full-scale operation of the new interlock system has been started since the end of March 2008. In this report we describe the operational performance of the new beam-charge interlock system. |
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TUP080 | Numerical Study of a New Bunch Length Monitor Utilizing a Detection of Electromagnetic Fields in Millimeter-Wave Region | vacuum, linac, dipole, electron | 582 |
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A new nondestructive bunch-length monitor has been numerically investigated. The monitor detects electromagnetic fields generated through a ceramic gap of a vacuum pipe when a charged particle beam passes through the pipe gap. The frequency spectrum of the electromagnetic fields detected in wave zone spreads over a millimeter-wave length from a microwave length region for a short pulse beam with a bunch length of pico-second region. The frequency spectrum strongly depends on the bunch length of the relativistic charged beam if the geometrical structure of the pipe gap is fixed. The detection principle of the bunch-length monitor and some numerical analysis results applied to a single-bunch electron beam of the KEKB injector linac are described in this report. |
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TUP081 | Transient Beam Loading Compensation in CTF3 | linac, beam-loading, electron, cavity | 585 |
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In the CLIC Test Facility 3 (CTF3), the strong coupling between the beam and the accelerating cavities (full beam loading) induces transient effects such that the head of the pulse is accelerated almost twice as much as the steady-state part of the pulse. The beam optics in the machine is tailored for the steady-state and not for the higher energy electrons, which are gradually lost. This can lead to inefficiency and contributes to the activation of the machine. A beam loading compensation scheme has been proposed to minimize this effect. By delaying appropriately the arrival time of rf pulse in accelerating cavities with respect to the beam, the transient energy can be brought close (to within a few percent) of the steady-state one. This paper presents the measurements done on CTF3 using time resolved energy measurements. |
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TUP082 | Bunch Length Measurements in CTF3 | pick-up, klystron, electron, linac | 588 |
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The CLIC Test Facility CTF3, being built at CERN by an international collaboration, should demonstrate the feasibility of the CLIC two-beam technology by 2010. One of the issues addressed is the control of the electron bunch length in the whole complex. A bunch length measurement system with good resolution is therefore paramount. Two different systems are presently used in CTF3, based on microwave spectroscopy and on transverse rf deflectors, respectively. In the paper we describe the two systems, we discuss the different experimental methods used and present the results of the latest measurement campaigns. |
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TUP087 | Spectral and Charge-Dependence Aspects of Enhanced OTR Signals from a Compressed Electron Beam | gun, linac, optics, cathode | 603 |
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Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357 |
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TUP090 | Optical Diffraction Radiation Measurements at CEBAF | background, diagnostics, electron, beam-losses | 609 |
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Optical diffraction radiation (ODR) is a promising technique, which could be used for non interceptive beam size measurements at future light sources. An ODR diagnostic station was designed and installed on a CEBAF transfer beam line. The purpose of the setup is to evaluate experimentally the applicability range for an ODR based non interceptive beam size monitor and to collect data to benchmark numerical modeling of the ODR. An extensive set of measurements were made at the electron beam energy of 4.5 GeV. The ODR measurements were made for both pulsed and CW electron beam of up to 80 uA. The wavelength dependence and polarization components of the ODR were studied using a set of insertable bandpass filters and polarizers. The typical transverse beam size during the measurements was ~150 microns. Complete ODR data, wavelength and polarization, were recorded for different beam sizes and intensities. The beam size was also measured with an optical transition radiation (OTR) as well as wire scanner located next to the ODR station. In this contribution we describe the experimental setup and present first results of the measurements with the comparison to the numerical simulations. |
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TUP093 | Activities on High Brightness Photo-injectors at the Frascati Laboratories, Italy | FEL, linac, emittance, laser | 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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TUP104 | A High-Brightness Low-Energy Photoinjector Option for the Fermilab Electron Accelerator Facility | electron, synchrotron, synchrotron-radiation, collective-effects | 648 |
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Funding: Work supported by Fermi Research Alliance LLC. Under DE-AC02- 07CH11359 with the U.S. DOE and by the Department of Education under contract P116Z010035 with Northern Illinois University |
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TH103 | Developing Facilities for SNS Cryomodule Performance Improvements | cryomodule, cavity, linac, shielding | 735 |
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Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy |
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FR103 | Operation of FLASH as an FEL User Facility | FEL, electron, 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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