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D. Alesini

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21 papers
title: Experimental Demonstration of Emittance Compensation with Velocity Bunching
format: journal article
publisher: Physical Review Letters
year: 5 February 2010
33 authors: M. Ferrario | D. Alesini | A. Bacci | M. Bellaveglia | R. Boni | M. Boscolo | M. Castellano | E. Chiadroni | A. Cianchi | L. Cultrera | G. Di Pirro | L. Ficcadenti | D. Filippetto | V. Fusco | A. Gallo | G. Gatti | L. Giannessi | M. Labat | B. Marchetti | C. Marrelli | M. Migliorati | A. Mostacci | E. Pace | L. Palumbo | M. Quattromini | C. Ronsivalle | A. R. Rossi | J. Rosenzweig | L. Serafini | M. Serluca | B. Spataro | C. Vaccarezza | C. Vicario
abstract: In this Letter we report the first experiments aimed at the simultaneous demonstration of the emittance compensation process and velocity bunching in a high brightness electron source, the SPARC photoinjector in INFN-LNF. While a maximum compression ratio up to a factor 14 has been observed, in a particular case of interest a compression factor of 3, yielding a slice current of 120 A with less than 2 m slice emittance, has been measured. This technique may be crucial in achieving high brightness beams in photoinjectors aiming at optimized performance of short wavelength single-pass free electron lasers or other advanced applications in laser-plasma accelerators.
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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 proceeding
conference: EPAC 2008
year: 2008
9 authors: A. Murokh | R. Agustsson | S. Boucher | P. Frigola | J.B. Rosenzweig | J. England | G. Travish | D. Alesini | V. Yakimenko
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.
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title: Recent results and future perspectives of the SPARC project
format: conference proceeding
conference: EPAC 2008
year: 2008
77 authors: M. Ferrario | D. Alesini | M. Bellaveglia | R. Boni | M. Boscolo | M. Castellano | E. Chiadroni | A. Clozza | L. Cultrera | G. Di Pirro | A. Drago | A. Esposito | L. Ficcadenti | D. Filippetto | V. Fusco | A. Gallo | G. Gatti | A. Ghigo | B. Marchetti | Agostino Marinelli | C. Marrelli | M. Migliorati | A. Mostacci | E. Pace | L. Palumbo | L. Pellegrino | R. Ricci | U. Rotundo | C. Sanelli | F. Sgamma | B. Spataro | F. Tazzioli | S. Tomassini | C. Vaccarezza | M. Vescovi | C. Vicario | F. Ciocci | G. Dattoli | A. Dipace | a. Doria | G. P. Gallerano | L. Giannessi | E. Giovenale | G. Orlandi | S. Pagnutti | A. Petraia | M. Quattromini | C. Ronsivalle | E. Sabia | I. Spassovsky | V. Surrenti | L. Catani | A. Cianchi | M. Mattioli | M. Petrarca | M. Serluca | A. Bacci | I. Boscolo | F.Broggi | F. Castelli | S. Cialdi | C. De Martinis | D. Giove | C. Maroli | V. Petrillo | A.R. Rossi | L. Serafini | J.B. Rosenzweig | M. E. Couprie | M. Bougeard | B. Carré | D. Garzella | M. Labat | G. Lambert | H. Merdji | P. Salières | O. Tchebakoff
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.
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title: High brightness electron beam emittance evolution measurements in an rf photoinjector
format: journal article
publisher: Physical Review Special Topics- Accelerators and Beams
year: 2008
48 authors: A. Cianchi | D. Alesini | A. Bacci | M. Bellaveglia | R. Boni | M. Boscolo | M. Castellano | L. Catani | E. Chiadroni | S. Cialdi | A. Clozzo | L. Cultrera | G. Di Pirro | A. Drago | A. Esposito | M. Ferrario | L. Ficcadenti | D. Filippetto | V. Fusco | A. Gallo | G. Gatti | A. Ghigo | L. Giannessi | C. Ligi | M. Mattioli | M. Migliorati | A. Mostacci | P. Musumeci | E. Pace | L. Palumbo | L. Pellegrino | M. Petrarca | M. Preger | M. Quattromini | R. Ricci | C. Ronsivalle | J.B. Rosenzweig | A.R. Rossi | C. Sanelli | L. Serafini | M. Serio | F. Sgamma | B. Spataro | F. Tazzioli | S. Tomassini | C. Vaccarezza | M. Vescovi | and C. Vicario
abstract: The new generation of linac injectors driving free electron lasers in the self-amplified stimulated emission (SASE-FEL) regime requires high brightness electron beams to generate radiation in the wavelength range from UV to x rays. The choice of the injector working point and its matching to the linac structure are the key factors to meet this requirement. An emittance compensation scheme presently applied in several photoinjectors worldwide is known as the ��Ferrario�� working point. In spite of its great importance there was, so far, no direct measurement of the beam parameters, such as emittance, transverse envelope, and energy spread, in the region downstream the rf gun and the solenoid of a photoinjector to validate the effectiveness of this approach. In order to fully characterize the beam dynamics with this scheme, an innovative beam diagnostic device, the emittance meter, consisting of a movable emittance measurement system, has been designed and built. With the emittance meter, measurements of the main beam parameters in both transverse phase spaces can be performed in a wide range of positions downstream the photoinjector. These measurements help in tuning the injector to optimize the working point and provide an important benchmark for the validation of simulation codes. We report the results of these measurements in the SPARC photoinjector and, in particular, the first experimental evidence of the double minimum in the emittance oscillation, which provides the optimized matching to the SPARC linac.
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title: Direct Measurement of the Double Emittance Minimum in the Beam Dynamics of the Sparc High-Brightness Photoinjector
format: journal article
publisher: Physical Review Letters
year: 6 December 2007
47 authors: M. Ferrario | D. Alesini | A. Bacci | M. Bellaveglia | R. Boni | M. Boscolo | M. Castellano | L. Catani | E. Chiadroni | S. Cialdi | A. Cianchi | A. Clozza | L. Cultrera | G. Di Pirro | A. Drago | A. Esposito | L. Ficcadenti | D. Filippetto | V. Fusco | A. Gallo | G. Gatti | A. Ghigo | L. Giannessi | C. Ligi | M. Mattioli | M. Migliorati | A. Mostacci | P. Musumeci | E. Pace | L. Palumbo | L. Pellegrino | M. Petrarca | M. Quattromini | R. Ricci | C. Ronsivalle | J.B. Rosenzweig | A.R. Rossi | C. Sanelli | L. Serafini | M. Serio | F. Sgamma | B. Spataro | F. Tazzioli | S. Tomassini | C. Vaccarezza | M. Vescovi | C. Vicario
abstract: In this Letter we report the first experimental observation of the double emittance minimum effect in the beam dynamics of high-brightness electron beam generation by photoinjectors; this effect, as predicted by the theory, is crucial in achieving minimum emittance in photoinjectors aiming at producing electron beams for short wavelength single-pass free electron lasers. The experiment described in this Letter was performed at the SPARC photoinjector site, during the first stage of commissioning of the SPARC project. The experiment was made possible by a newly conceived device, called an emittance meter, which allows a detailed and unprecedented study of the emittance compensation process as the beam propagates along the beam pipe.
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title: RF Measurements results of the final brazed SPARC RF Deflector
format: journal article
publisher:
year: 2007
7 authors: L. Ficcadenti | L. Palumbo | A. Mostacci | D. Alesini | C. Vaccarezza | G. Di Pirro | J.B. Rosenzweig
abstract: The longitudinal phase space and the horizontal beam slice emittance measurements of the SPARC 150MeV-lnC electron beam, foresee the use of a RF deflector. he device is a five cells standing wave structure operating on the TM110-like dipole mode at 2.856Ghz and allows reaching a longitudinal resolution of ~12um with 2MW of peak input power. In the paper we illustrate the RF measurements results on the final brazed copper device.
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title: Status of the SPARC-X Project
format: conference proceeding
conference: PAC 2007
year: 2007
97 authors: C. Vaccarezza | D. Alesini | M. Bellaveglia | S. Bertolucci | R. Boni | M. Boscolo | M. Castellano | A. Clozza | L. Cultrera | G. Di Pirro | A. Drago | A. Esposito | M. Ferrario | L. Ficcadenti | D. Filippetto | V. Fusco | A. Gallo | G. Gatti | A. Ghigo | C. Ligi | Agostino Marinelli | M. Migliorati | A. Mostacci | E. Pace | L. Palumbo | L. Pellegrino | M. Preger | R. Ricci | C. Sanelli | M. Serio | F. Sgamma | B. Spataro | A. Stella | F. Tazzioli | M. Vescovi | C. Vicario | F. Ciocci | G. Dattoli | A. Dipace | A. Doria | F. Flora | G.P. Gallerano | L. Giannessi | E. Giovenale | G. Messina | P.L. Ottaviani | S. Pagnutti | G. Parisi | L. Picardi | M. Quattromini | A. Renieri | G. Ronci | C. Ronsivalle | M. Rosetti | E. Sabia | M. Sassi | A. Torre | A. Zucchini | M. Mattioli | D. Pelliccia | L. Catani | E. Chiadroni | A. Cianchi | E. Gabrielli | C. Schaerf | P. Musumeci | M. Petrarca | F. Alessandria | A. Bacci | R. Bonifacio | I. Boscolo | F. Broggi | C. De Martinis | F. Castelli | S. Cialdi | D. Giove | A. Flacco | C. Maroli | V. Petrillo | A.R. Rossi | L. Serafini | A. Perrone | M. Labat | O. Tcherbakoff | G. Lambert | D. Garzella | M. Bougeard | P. Breger | P. Monchicourt | H. Merdji | P. Salie?res | B. Carre? | M. E. Couprie | P. Emma | C. Pellegrini | S. Reiche | J.B. Rosenzweig
abstract: SPARC-X is a two branch project consisting in the SPARC test facility dedicated to the development and test of critical subsystems such as high brightness photoinjector and a modular expandable undulator for SASE-FEL experiments at 500 nm with seeding, and the SPARX facility aiming at generation of high brilliance coherent radiation in the 1.5-13 nm range, based on the achieved expertise. The projects are supported by MIUR (Research Department of Italian Government) and Regione Lazio. SPARC has completed the commissioning phase of the photoinjector in November 2006. The achieved experimental results are here summarized together with the status of the second phase commissioning plans. The SPARX project is based on the generation of ultra high peak brightness electron beams at the energy of 1 and 2 GeV generating radiation in the 1.5-13 nm range. The construction is at the moment planned in two steps starting with a 1 GeV Linac. The project layout including both RF-compression and magnetic chicane techniques has been studied.
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title: Commissioning of the UCLA Neptune X-band Deflecting Cavity and Applications to Current Profile Measurement of Ramped Electron Bunches
format: conference proceeding
conference: PAC 2007
year: 2007
5 authors: R.J. England | B. O'Shea | J.B. Rosenzweig | G. Travish | D. Alesini
abstract: A 9-cell standing-wave deflecting cavity has recently been constructed and installed at the UCLA Neptune Lab- oratory for use as a temporal diagnostic for the 13 MeV, 300 to 700 pC electron bunches generated by the Neptune photoinjector beamline. The cavity is a center-fed Glid- Cop structure operating in at TM110-like deflecting mode at 9.59616 GHz with a ? phase advance per cell. At the maximum deflecting voltage of 530 kV, the theoretical res- olution limit of the device is 50 fs, although with current beam parameters and a RMS spot size of 460 ?m the ef- fective resolution is approximately 400 fs. We discuss the operation and testing of the cavity as well as its intended application of measuring the temporal current profile of ramped electron bunches generated using the Neptune dog- leg compressor, and we present the first measurements of the electron beam current profile obtained using the deflect- ing cavity.
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title: commissioning of the UCLA Neptune X-Band Deflecting Cavity and Applications to Current Profile Measurement of Ramped Electron Bunches
format: conference proceeding
conference: PAC 2007
year: 2007
5 authors: R. J. England | B. O'Shea | J.B. Rosenzweig | G. Travish | D. Alesini
abstract: A 9-cell standing wave deflecting cavity has recently been constructed and installed at the UCLA Neptune Laboratory for use as a temporal diagnostic for the 13 MeV, 300 to 700 pC electron bunches generated by the Neptune photoinjector beamline. The cavity is a center-fed Glid-Cop structure operating in at TM110-like deflecting mode at 9.59616 GHz with a pi phase advance per cell. At the maximum deflecting voltage of 500 kV, the theoretical resolution limit of the device is 50 fs, although with current beam parameters and a spot size of 460 microns RMS the effective resolution is approximately 400 fs. We discuss the operation and testing of the cavity as well as its intended application: measuring the temporal current profile of ramped electron bunches generated using the Neptune dogleg compressor, and we present the first measurements of the electron beam current profile obtained using the deflecting cavity.
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title: RF Design of the UCLA/INFN Hybrid SW/TW Photoinjector
format: conference proceeding
conference:
year: 2006
9 authors: J.B. Rosenzweig | Alessandro Boni | A. Fukasawa | D. Alesini | Massimo Ferrario | Bruno Spataro | Luca Ficcadenti | Andrea Palumbo | B. O'Shea
abstract: With increasing demand for high brightness, low emittance beams for use with freeelectron lasers, Compton scattering systems and wake-field accelerator experiments, stringent requirements have been placed on the design and operation of the 1.6 cell photoinjector. The proposed hybrid photoinjector combines the BNL/UCLA/SLAC style 1.5/1.6 cell standing wave gun with a traveling wave accelerator. Our goal is an injector that meets todays requirements and is scalable in design to meet tomorrows demands: emittances in the region of 1 mm-mrad for higher brightness as well as higher currents. The hybrid photoinjector also offers higher energy operation, enhanced cost effectiveness and better scalability than current designs such as integrated PWT photoinjectors and split gun/accelerating sections. The use of both SW and TW systems allows for higher gradients (Eo = 70 MV/m) in the SW gun for effective capture at lower emittances, while the lower energy acceleration in the TW sections (Eo = 13.5 MV/m) allows generation of higher energy beams which are less sensitive to space charge effects. We note the current results of simulation of beam dynamics, en,x = 3 mm-mrad, an energy spread of 1.5% with beam energies of 21 MeV at currents as high as 1.2 kA. Further we explore the possibilities of scalability to higher frequencies, analysis of coupling design, present cold test preparations and simulated RF analysis of the structure.
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title: Beam Dynamics in a Hybrid Standing Wave-Traveling Wave Photoinjector
format: conference proceeding
conference: AAC 2006 12th
year: 2006
11 authors: J.B. Rosenzweig | D. Alesini | A. Boni | M. Ferrario | L. Ficcadenti | A. Fukusawa | A. Mostacci | B. O'Shea | L. Palumbo | B. Spataro | V. Fusco
abstract: We discuss the dynamics of of a photoinjector beam in a hybrid traveling wave-standing wave photoinjector. With the field profile deduced from electromagnetic simulations, it is seen that the acceleration program induces strong velocity bunching. The beam dynamics in this scenario are explored using UCLA PARMELA. With a solenoid field overlaid on the TW section one may control emittance oscillations during bunching and acceleration. It is seen that the S-band device currently under development at UCLA may produce a 1 nC, 21 MeV, 100 micron rms pulse length beam, with emittance of 3 mm-mrad. Applications of this beam for creating coherent radiation are discussed.
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title: Experiment to Measure Ramped Electron Bunches at the UCLA Neptune Laboratory Using a Transverse Deflecting Cavity
format: conference proceeding
conference: AAC 2006 12th
year: 2006
5 authors: R. J. England | D. Alesini | B. O'Shea | J.B. Rosenzweig | G. Travish
abstract: A proof of principle experiment is underway at the UCLA Neptune laboratory to test the concept of generating linearly ramped relativistic electron bunches (rising in density from head to tail followed by a sharp cutoff) by using a sextupole-corrected dogleg section as a bunch compressor. Bunches with this structure have been predicted to be ideal for use as a plasma wake-field drive beam. The diagnostic being developed to measure the time profile of the beam is an X-Band (9.6 GHz) deflecting cavity. The recently completed cavity is a 9-cell standing wave structure operating in a TM110-like mode, designed to measure the temporal structure of the 2 to 10 ps, 14 MeV electron bunches generated by the Neptune S-band photoinjector and plane-wave transformer (PWT) accelerator beamline, with 50 fs resolution. We discuss the experimental plan for the ramped bunch experiment and present preliminary data related to the tuning and operation of the deflecting cavity.
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title: Status of the SPARC Photoinjector
format: conference proceeding
conference: Linear Accelerator Conference 2006
year: 2006
69 authors: D. Alesini | M. Bellaveglia | S. Bertolucci | R. Boni | M. Boscolo | M. Castellano | A. Clozza | L. Cultrera | G. Di Pirro | A. Drago | A. Esposito | M. Ferrario | L. Ficcadenti | D. Filippetto | V. Fusco | G. Gatti | A. Gallo | A. Ghigo | M. Incurvati | C. Ligi | F. Marcellini | M. Migliorati | A. Mostacci | L. Palumbo | L. Pellegrino | M. Preger | R. Ricci | C. Sanelli | M. Serio | F. Sgamma | B. Spataro | A. Stecchi | A. Stella | F. Tazzioli | C. Vaccarezza | M. Vescovi | C. Vicario | F. Alessandria | A. Bacci | I. Boscolo | F. Broggi | S.Cialdi | C. DeMartinis | D. Giove | C. Maroli | M. Mauri | V. Petrillo | M. Rome | A. R. Rossi | L. Serafini | D. Levi | M. Mattioli | P. Musumeci | G. Medici | D. Pelliccia | M. Petrarca | L. Catani | E. Chiadroni | A. Cianchi | E. Gabrielli | S. Tazzari | A. Perrone | L. Giannessi | L. Picardi | M. Quattromini | C. Ronsivalle | J.B. Rosenzweig | G. Travish | S. Reiche
abstract: The SPARC Project is starting the commissioning of its photo-injector. RF gun, RF sources, RF network and control, power supplies, emittance meter, beam diagnostics and control to measure the RF gun beam have been installed. The photocathode drive laser has been characterized in terms of pulse shape and quality. We will report also about first tests made on RF gun and on the emittance meter device. Additional R&D on X-band and S-band structures for velocity bunching are in progress, as well as studies on new photocathode materials. We will also discuss studies on solenoid field defects, beam based alignments and exotic electron bunch production via blow-out of short laser pulses.
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title: Status of the SPARX FEL Project
format: conference proceeding
conference: EPAC 2006
year: 2006
67 authors: C.Vaccarezza | D.Alesini | M.Bellaveglia | S.Bertolucci | M.E Biagini | R.Boni | M.Boscolo | M.Castellano | A.Clozza | L.Cultrera | G.Di Pirro | A.Drago | A.Esposito | M.Ferrario | D.Filippetto | V.Fusco | A.Gallo | A.Ghigo | S.Guiducci | M.Migliorati | L.Palumbo | L.Pellegrino | M.Preger | C.Sanelli | M.Serio | F.Sgamma | B.Spataro | A.Stella | F.Tazzioli | M.Vescovi | C.Vicario | F. Ciocci | G.Dattoli | A.Doria | F.Flora | G.Gallerano | L.Giannessi | E.Giovenale | G.Messina | P.L. Ottaviani | G.Parisi | L.Picardi | M.Quattromini | A.Renieri | C. Ronsivalle | S.Cialdi | C.Maroli | V.Petrillo | M. Rome | L.Serafini | L.Catani | E.Chiadroni | A. Cianchi | C.Schaerf | P.Musumeci | F.Alessandria | A.Bacci | F.Broggi | C.De Martinis | D.Giove | M.Mauri | L. Ficcadenti | M.Mattioli | A.Mostacci | P.Emma | S.Reiche | J.B. Rosenzweig
abstract: The SPARX project consists in an X-ray-FEL facility jointly supported by MIUR (Research Department of Italian Government), Regione Lazio, CNR, ENEA, INFN and Rome University Tor Vergata. It is the natural extension of the ongoing activities of the SPARC collaboration. The aim is the generation of electron beams characterized by ultra-high peak brightness at the energy of 1 and 2 GeV, for the first and the second phase respectively. The beam is expected to drive a single pass FEL experiment in the range of 13.5�6 nm and 6�1.5 nm, at 1 GeV and 2 GeV respectively, both in SASE and SEEDED FEL configurations. A hybrid scheme of RF and magnetic compression will be adopted, based on the expertise achieved at the SPARC high brightness photoinjector presently under commissioning at Frascati INFN-LNF Laboratories [1,2]. The use of superconducting and exotic undulator sections will be also exploited. In this paper we report the progress of the collaboration together with start to end simulation results based on a combined scheme of RF compression techniques.
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title: The Design of a Hybrid Photoinjector for High Brightness Beam Applications
format: conference proceeding
conference: EPAC 2006
year: 2006
10 authors: D. Alesini | M. Ferrario | V. Fusco | B. Spataro | L. Ficcadenti | A. Mostacci | L. Palumbo | B. O'Shea | J.B. Rosenzweig | G. Travish
abstract: In this paper, we illustrate the electromagnetic and beam dynamics design procedure of a new class of photoinjector, a hybrid standing/traveling wave structure. In this device a standing wave RF gun section is integrated with a downstream traveling wave structure through a coupling cell that feeds simultaneously the two sections. We discuss the advantages in RF and beam performance of the hybrid photoinjector compared to conventional systems. The electromagnetic design has been performed using the 3D electromagnetic code HFSS. Results of beam dynamics simulations in different operating conditions are also discussed.
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title: Observation of Coherent Edge Radiation Emitted by a 100 Femtosecond Compressed Electron Beam
format: conference proceeding
conference: ICFA Workshop on Physics and Applications of High Brightness Electron Beams
year: 2006
14 authors: G. Andonian | M. Dunning | E. Hemsing | J.B. Rosenzweig | A. M. Cook | A. Murokh | S. Reiche | M. Babzien | I. Ben-Zvi | K. Kusche | V. Yakimenko | D. Alesini | L. Palumbo | C. Vicario
abstract: A chicane compressor developed by UCLA for the production of ultra-short, 60 MeV electron beams at the Brookhaven National Laboratory Accelerator Test Facility has been commissioned, and initial beam physics experiments have been performed. These measurements have established the compression of electron beams to the 100 femtosecond (1 kA peak current) regime, via coherent transition radiation (CTR) based measurements. Investigations of coherent edge radiation (CER) include signatures that differentiate it from coherent synchrotron radiation (CSR), such as polarization and far-field angular distribution. Additionally, the radiation wavelength spectrum is determined from autocorrelation measurements. Radiation properties are compared to detailed start-to-end simulations derived from PARMELA and QUINDI (a Lienard-Wiechert code developed at UCLA). Plans for future experiments which further explore the observed wavelength spectra are presented.
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title: X-Band Dipole Mode Deflecting Cavity for the UCLA Neptune Beamline
format: conference proceeding
conference: PAC 2005
year: 2005
5 authors: R. J. England | B. O'Shea | J.B. Rosenzweig | G. Travish | D. Alesini
abstract: We report progress on the design and construction of a nine-cell cavity operating in a TM110-like dipole mode for use as a temporal diagnostic of the 14 MeV, 300 pC electron bunches generated at the UCLA Neptune Laboratory linear accelerator, with an anticipated temporal resolution of 50 fs at a peak input power of 50 kW. The cavity is a center-fed standing-wave pi-mode structure, operating at 9.6 GHz, and incorporating a knife-edge and gasket assembly which minimizes the need for brazing or welding. Results of initial RF testing of the prototype cavity are discussed and compared with simulation results obtained using the commercial code HFSS.
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title: Status Report on SPARC Project
format: conference proceeding
conference: FEL 2004 26th
year: 2004
96 authors: A. Renieri | M. Carpanese | F. Ciocci | G. Dattoli | A. Di Pace | A. Doria | F. Flora | G. P. Gallerano | L. Giannessi | E. Giovenale | G. Messina | L. Mezi | P. L. Ottaviani | S. Pagnutti | G. Parisi | L. Picardi | M. Quattromini | G. Ronci | C. Ronsivalle | E. Sabia | M. Sassi | A. Zucchini | D. Alesini | M. Bellaveglia | S. Bertolucci | M.E. Biagini | C. Biscari | R. Boni | M. Boscolo | M. Castellano | A. Clozza | G. Di Pirro | A. Drago | A. Esposito | M. Ferrario | D. Filippetto | V. Fusco | A. Gallo | A. Ghigo | S. Guiducci | M. Incurvati | C. Ligi | F. Marcellini | M. Migliorati | C. Milardi | L. Palumbo | L. Pellegrino | M. Preger | P. Raimondi | R. Ricci | C. Sanelli | M. Serio | F. Sgamma | B. Spataro | A. Stecchi | A. Stella | F. Tazzioli | C. Vaccarezza | M. Vescovi | C. Vicario | M. Zobov | F. Alessandria | A. Bacci | I. Boscolo | F. Broggi | S. Cialdi | C. De Martinis | D. Giove | C. Maroli | V. Petrillo | M. Romè | L. Serafini | D. Levi | M. Mattioli | G. Medici | P. Musumeci | L. Catani | E. Chiadroni | S. Tazzari | C.J. Bocchetta | M. Danailov | G. D'Auria | M. Ferianis | A. Cianchi | A. D'Angelo | R. Di Salvo | A. Fantini | D. Moricciani | C. Schaerf | S. Reiche | J.B. Rosenzweig | G. Travish | D.H. Dowell | P. Emma | C. Limborg | D. Palmer
abstract: We review the status of FEL source activity of the ongoing SPARC FEL experiment, developed within the framework of a collaboration among ENEA, CNR, INFN, INFM, Sincrotrone Trieste and University of Rome Tor Vergata. The project is aimed at realising a SASE-FEL source, operating in the visible (around 500 nm), with an extended range of tunability down to the VUV (100 nm) by the use of the mechanism of non-linear harmonic generation. The development of the relevant activities foresees the realisation of an advanced 150 MeV photo- injector source, aimed at producing a high brightness electron beams, needed to drive a SASE-FEL experiment, and a 14 m long undulator. We present the status of the design and construction of SPARC FEL device. In particular we discuss the choice of the project parameters, their optimisation and the sensitivity of the SPARC performance to any parameter variation. We will show, using start-to-end simulations, what is the impact of the e- beam and of the undulator parameters on the characteristics of the output laser field and in particular on the amount of the non-linearly generated power at higher harmonics.
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title: UCLA Neptune Ramped Electron Bunch Experiment
format: journal article
publisher: AIP Conference Proceedings
year: 2004
5 authors: R. J. England | D. Alesini | A. Doyuran | P. Musumeci | J.B. Rosenzweig
abstract: A ramped electron bunch (i.e. one having a current density which rises linearly from the head to the tail and then drops sharply to zero) has been predicted to be an ideal drive beam for the plasma wake field accelerator due to the large transformer ratio it is capable of generating. A scheme was recently proposed for the creation of a relativistic electron bunch that approximates a ramped current profile [England, et al., AIP Conf. Proc. 647, p.884 (2002)], using a dogleg or dispersionless translating section as a bunch compressor. An experiment is underway at the Neptune laboratory using this scheme to create such a beam. The diagnostic being developed for measuring the temporal profile of the beam is an X-Band transverse deflecting mode cavity. 2004 American Institute of Physics
keywords: pbpl  
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title: The SPARX project: R & D Activity towards X-Ray Sources
format: journal article
publisher:
year: 2004
80 authors: D.Alesini | S.Bertolucci | M. Bellaveglia | M.E.Biagini | R.Boni | M.Boscolo | M.Castellano | A.Clozza | G.Di Pirro | A.Drago | A.Esposito | M.Ferrario | D. Filippetto | V.Fusco | A.Gallo | A.Ghigo | S.Guiducci | M.Incurvati | C.Ligi | F.Marcellini | M.Migliorati | A.Mostacci | L.Palumbo | L.Pellegrino | M.Preger | P. Raimondi | R.Ricci | C.Sanelli | M.Serio | F.Sgamma | B.Spataro | A.Stecchi | A.Stella | F.Tazzioli | C.Vaccarezza | M.Vescovi | C.Vicario | F.Alessandria | A.Bacci | I.Boscolo | F.Broggi | S.Cialdi | C.De Martinis | D.Giove | C.Maroli | M. Mauri | V.Petrillo | M. Romè | L.Serafini | M.Mattioli | P. Musumeci | L.Catani | E.Chiadroni | A. Cianchi | C. Schaerf | F.Ciocci | G.Dattoli | A. Di Pace | A.Doria | F.Flora | G.P.Gallerano | L.Giannessi | E.Giovenale | G.Messina | L.Mezi | P.L.Ottaviani | S. Pagnutti | G. Parisi | L.Picardi | M.Quattromini | A.Renieri | C.Ronsivalle | A. Torre | A. Zucchini | S. De Silvestri | M. Nisoli | S. Stagira | J.B. Rosenzweig | S. Reiche | P.Emma
abstract: SPARX is an evolutionary project proposed by a collaboration among ENEA-INFN-CNR-Universita` di Roma Tor Vergata aiming at the construction of a FEL- SASE X-ray source in the Tor Vergata Campus. The first phase of the SPARX project, funded by Government Agencies, will be focused on R&D activity on critical components and techniques for future X-ray facilities as described in this paper.
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title: The SPARC Project: A High Brightness Electron Beam Source at LNF to Drive a SASE-FEL Experiment
format: conference proceeding
conference: PAC 2003
year: 2003
75 authors: D. Alesini | S. Bertolucci | M. Biagini | C. Biscari | R. Boni | M. Boscolo | M. Castellano | A. Clozza | G. Di Pirro | A. Drago | A. Esposito | M. Ferrario | V. Fusco | A. Gallo | A. Ghigo | S. Guiducci | M. Incurvati | C. Ligi | F. Marcellini | M. Migliorati | C. Milardi | L. Palumbo | L. Pellegrino | M. Preger | P. Raimondi | R. Ricci | C. Sanelli | M. Serio | F. Sgamma | B. Spataro | A. Stecchi | A. Stella | F. Tazzioli | C. Vaccarezza | M. Vescovi | C. Vicario | M. Zobov | F. Alessandria | A. Bacci | I. Boscolo | F. Broggi | S. Cialdi | C. DeMartinis | D. Giove | C. Maroli | V. Petrillo | M. Rome | L. Serafini | D. Levi | M. Mattioli | L. Catani | E. Chiadroni | S. Tazzari | R. Bartolini | F. Ciocci | G. Dattoli | A. Doria | F. Flora | G. P. Gallerano | L. Giannessi | E. Giovenale | G. Messina | L. Mezi | P. L. Ottaviani | L. Picardi | M. Quattromini | A. Renieri | C. Ronsivalle | A. Cianchi | A. D'Angelo | R. Di Salvo | A. Fantini | D. Moricciani | C. Schaerf | J.B. Rosenzweig
abstract: The Project SPARC (Sorgente Pulsata e Amplificata di Radiazione Coerente), proposed by a collaboration among ENEA-INFN-CNR-Universita' di Roma "Tor Vergata" -INFM-ST, was recently approved by the Italian Government and will be built at LNF of INFN. The aim of the project is to promote an R&D activity oriented to the development of a coherent ultra-brilliant X-ray source in Italy. This collaboration has identified a program founded on two main issues: the generation of ultra-high peak brightness electron beams and of resonant higher harmonics in the SASE-FEL process.
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