Name: EPAC 2008
Location: Italy
Date: 2008-06-01
Comments:
Created at: Tue Jul 15 14:57:06 -0700 2008
Updated at: Tue Jul 15 14:57:06 -0700 2008
Edit | Back | Add Paper| title: | Single spike operation in SPARC SASE-FEL |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | |
| 16 authors: | | | | | | | | | | | | | | | | |
| abstract: | The single spike operation regime has been analyzed in the case of the SPARC injector and freeelectron-laser. Four different beams at 50 pC are studied, with different production condition and performance. |
| keywords: | pbpl_pub |
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| title: | Status of the Fermi@Elettra Photoinjector |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 21 authors: | | | | | | | | | | | | | | | | | | | | | |
| abstract: | The new FERMI@Elettra photoinjector is presently undergoing high-power testing and characterization at MAXlab in Lund, Sweden. This effort is a collaboration between Sincrotrone Trieste, MAX-lab and UCLA. The 1.6-cell RF gun cavity and the focusing solenoid were successfully designed and built by the Particle Beam Physics Laboratory at UCLA, delivered to Sincrotrone Trieste at the beginning of 2008, and installed in the linac tunnel at MAX-lab. Use of the MAX-lab facility will allow the FERMI project to progress significantly with the photoinjector while waiting for the completion of the new linac building extension at Sincrotrone Trieste. We report here on the high-power conditioning of the RF cavity and the first beam tests. |
| keywords: | pbpl_pub |
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| title: | Experimental Generation and Characterization of Uniformly Filled Ellipsoidal Beam Distribution |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 6 authors: | | | | | | |
| abstract: | Recently, a scheme for producing ideal uniformly filled ellipsoidal beam distributions, which depends on the strong longitudinal expansion of an initially very short beam under its own space charge forces, has been demonstrated at the UCLA Pegasus Laboratory. Here we present further work on the characterization of this novel regime of operation of a photoinjector. In particular we study the sensitivity of the generation of the uniformly filled ellipsoidal distribution from the initial transverse laser profile. The ultra-high brightness of the beam created operating in this ‘blow-out’ regime is verified obtaining high quality relativistic electron diffraction patterns from thin Al foils. |
| keywords: | pbpl_pub |
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| title: | A Novel Fabrication Technique for the Production of RF Photoinjectors |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 9 authors: | | | | | | | | | |
| abstract: | Recent developments in Solid Freeform Fabrication (SFF) technology may make it possible to design and produce near netshape copper structures for the next generation of very high duty factor, high gradient radio frequency (RF) photoinjectors. RF and thermal management optimized geometries could be fully realized without the usual constraints and compromises of conventional machining techniques. A photoinjector design incorporating SFF and results from an initial material feasibility study will be reported. |
| keywords: | pbpl_pub |
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| title: | Design and Fabrication of an X-Band traveling wave deflection mode cavity for longitudinal characterization of ultra-short electron beam pulses |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 9 authors: | | | | | | | | | |
| abstract: | An X-band Traveling wave Deflector mode cavity (XTD) has been developed at Radiabeam Technologies to perform longitudinal characterization of the subpicosecond ultra-relativistic electron beams. The device is optimized for the 100 MeV electron beam parameters at the Accelerator Test Facility (ATF) at Brookhaven National Laboratory, and is scalable to higher energies. An XTD is designed to operate at 11.424 GHz, and features short filling time, femtosecond resolution, and a small footprint. RF design, fabrication procedure, and commissioning plans are presented. An experimental program at ATF to utilize the deflector for compressed beam characterization is discussed, including proposed measurements of the phase space filamentation due to non-linear processes in a chicane compressor. |
| keywords: | pbpl_pub |
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| title: | Recent results and future perspectives of the SPARC project |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 77 authors: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| abstract: | The SPARC project foresees the realization of a high brightness photo-injector to produce a 150-200 MeV electron beam to drive 500 nm FEL experiments in various configurations, a Thomson backscattering source and a plasma accelerator experiment (these last two ones jointly with the project PLASMONX). The SPARC photoinjector is also the test facility for the recently approved VUV FEL project named SPARX. As a first stage of the commissioning, a complete characterization of the photoinjector has been accomplished with a detailed study of the emittance compensation process downstream the gun-solenoid system: this lead to the first direct experimental demonstration of emittance oscillations in a drift. The second stage of the commissioning, that is currently underway, foresees a detailed analysis of the beam matching with the linac in order to confirm the theoretically prediction of emittance compensation based on the “invariant envelope” matching and the demonstration of the “velocity bunching” technique in the linac. SASE and SEEDING experiments are foreseen by the end of the current year. In this paper we report the experimental results obtained so far and the scientific program for the near future. |
| keywords: | pbpl_pub |
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| title: | Simulation of and progress towards a micron-scale laser-powered dielectric electron source |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 5 authors: | | | | | |
| abstract: | A dielectric, slab-symmetric structure for generating and accelerating low-energy electrons has been under study for the past two years. The resonant device is driven by a side-coupled laser and is configured to maintain field profiles necessary for synchronous acceleration and focusing of nonrelativistic particles. Intended applications of the structure include the production of radiation for medical treatments, imaging, and industrial uses. Results from 3D simulation of the structure geometry and its resonant properties are presented here. |
| keywords: | pbpl_pub |
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| title: | SPUR: A new code for the calculation of synchrotron radiation from very long undulator systems |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 3 authors: | | | |
| abstract: | The accurate calculation of synchrotron radiation from an undulator is a common problem and numerous codes have been developed that describe the radiation from analytic and measured undulator fields. However, for very long undulator systems there is not a suitable code that can handle the amount of data in a convenient manner and which runs in a practically realisable time limit. The development of a new code, SPontaneous Undulator Radiation (SPUR) [1], is presented which computes the spontaneous radiation from electron beams passing through a system of undulators. The code supports parallel architecture, and uses the HDF5 [2] technology to efficiently handle the multi-dimensional data. The latest developments and benchmarking are presented. |
| keywords: | pbpl_pub |
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| title: | A real-time bunch length terahertz interferometer |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 5 authors: | | | | | |
| abstract: | The recent development of advanced photoinjectors and next generation light sources guides the progression towards high-current, ultra-short beams. The measurement of these short pulses, with sub-picosecond resolution, is essential for successful beam operation and optimization. This paper describes the development of a real-time, shotto-shot bunch length diagnostic utilizing a novel coherent terahertz radiation autocorrelation technique. The proposed diagnostic is called the real-time interferometer (RTI). |
| keywords: | pbpl_pub |
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| title: | Micro Pyroelectric Electron Gun |
| format: | tech note |
| year: | 2008 |
| 1 author: | |
| abstract: | This paper describes an ongoing experiment for construction of a ferroelectric micro electron gun with kinetic energies of 25keV. Described are concepts on electron emission and acceleration with emphasis on using pyroelectric crystals as an electron source. A setup has been build to test pyroelectric crystals as emitters and as generators of electric fields for electron acceleration. The purpose of constructing a micro electron gun is to use it as a part of a high gradient laser powered micro accelerating platform capable of accelerating electrons to energies of ~1 - 2MeV. The construction of this platform is an ongoing project by R. B. Yoder, G. Travish and J. B. Rosenzweig.[2] The applications of an inexpensive near relativistic micro electron source are manifold and include the possibility of treating cancer with electron or X-ray radiation directly at the tumor[12] Ferroelectric electron emission have been studied by many including Rosenman[1] and Brownridge[4] all in which the emitting crystals are much larger than the crystal proposed for the micro gun. So one of the great challenges for this experiment is to measure electron emission from micro crystals. The minimum beam energy for the emitted electrons is approximately 25keV, which is the threshold energy in which the electrons can be accelerated in the laser field. Hence another challenge of this project is to provide a field of at least 25keV. |
| keywords: | pbpl_tech |
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