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| MOPPH009 |
Comparison of HGHG and Self Seeded Scheme for the Production of Narrow Bandwidth FEL Radiation
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25 |
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- A. Marinelli
Rome University La Sapienza, Roma
- L. Giannessi
ENEA C. R. Frascati, Frascati (Roma)
- C. Pellegrini, S. Reiche
UCLA, Los Angeles, California
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One goal of several FEL facilities operating in the soft x-ray spectral range, is the production of narrow bandwidth FEL radiation. Several schemes have been proposed to obtain narrower bandwidths than that achievable with SASE-FELs. In this paper we investigate numerically, and compare, the properties of two schemes: Self-Seeding and High Gain Harmonic Generation. These schemes have been thoroughly studied analitically and numerically in the past. The aim of this work is to compare the performances of these schemes with respect to several non-ideal properties of the electron beam and seed laser, such as shot to shot energy fluctuations, nonlinear energy chirp and phase noise in the seed source. The work has been carried out with the aid of the time dependent FEL codes GENESIS (3D) and PERSEO (1D).
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| MOPPH026 |
High Gain FEL Amplification of Charge Modulation Caused by a Hadron
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51 |
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- V. Litvinenko, I. Ben-Zvi, Y. Hao, A. Kayran, E. Pozdeyev, G. Wang
BNL, Upton, Long Island, New York
- S. Reiche
UCLA, Los Angeles, California
- O. A. Shevchenko, N. Vinokurov
BINP SB RAS, Novosibirsk
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In scheme of coherent electron cooling*, a modulation of electron beam density induced by a co-propagation hadron is amplified in high gain FEL. The resulting amplified modulation of electron beam, its shape, form and its lethargy determine number of important properties of the coherent electron cooling. In this talk we present both analytical and numerical (using codes RON and Genesis) evaluations of the corresponding Green functions. We also discuss influence of electron beam parameters on the FEL response.
* V. N.Litvinenko, Y. S.Derbenev, Proc. of 29th International FEL Conference, Novosibirsk, Russia, August 27-31, 2007, p.268, http://accelconf.web.cern.ch/accelconf/f07/HTML/AUTHOR. HTM
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| TUPPH018 |
Longitudinal Diagnostic for Single-Spike SASE FEL Operation
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274 |
| |
- G. Marcus, G. Andonian, A. Fukasawa, S. Reiche, J. B. Rosenzweig
UCLA, Los Angeles, California
- M. Ferrario, L. Palumbo
INFN/LNF, Frascati (Roma)
- L. Giannessi
ENEA C. R. Frascati, Frascati (Roma)
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The possibility of ultra-short beam, very low charge, short wavelength FELs at SPARC has been recently investigated. This paper explores the development of a longitudinal diagnostic that will provide the capability to characterize the short wavelength radiation based on the Frequency Resolved Optical Gating (FROG) technique. The paper includes studies of pulses simulated for the SPARC case using GENESIS and reconstructed using the FROG algorithm as well as proposed experimental layouts for the device.
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| TUBAU04 |
Generation of Sub-fsec, High Brightness Electron Beams for Single Spike SASE FEL Operation
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214 |
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- J. B. Rosenzweig, M. P. Dunning, L. Faillace, A. Fukasawa, E. Hemsing, G. Marcus, A. Marinelli, P. Musumeci, B. D. O'Shea, C. Pellegrini, S. Reiche
UCLA, Los Angeles, California
- M. Boscolo, M. Ferrario, L. Palumbo, B. Spataro, C. Vaccarezza
INFN/LNF, Frascati (Roma)
- L. Giannessi, C. Ronsivalle
ENEA C. R. Frascati, Frascati (Roma)
- V. Petrillo
Istituto Nazionale di Fisica Nucleare, Milano
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We present here the theory and computational modeling of beams in a new regime, where <1 pC beams are strongly velocity bunched at low energy, and then compressed at several GeV to less than a fsec. This regime of operation produces beams with thermally dominated transverse emittance, and mitigates many problems associated with the nC-level operation. These problems include CSR induced instability and intra-undulator wakes. The resulting beams have extremely high brightness, enabling very high gain, efficiency, and single spike operation. We present the scaling laws governing this regime, and the detailed example of the proposed SPARX FEL design.
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| TUPPH012 |
Single spike experiments with the SPARC SASE FEL
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258 |
| |
- M. Ferrario, M. Boscolo, L. Palumbo, C. Vaccarezza
INFN/LNF, Frascati (Roma)
- G. Andonian, E. Hemsing, G. Marcus, S. Reiche, J. B. Rosenzweig
UCLA, Los Angeles, California
- A. Bacci, I. Boscolo, F. Castelli, S. Cialdi, V. Petrillo, L. Serafini
Istituto Nazionale di Fisica Nucleare, Milano
- L. Giannessi, C. Ronsivalle
ENEA C. R. Frascati, Frascati (Roma)
- M. Serluca
INFN-Roma, Roma
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We describe in this paper a possible experiment with the existing SPARC photoinjector to test the generation of sub-picosecond high brightness electron bunches able to produce single spike radiation pulses at 500 nm with the SPARC self-amplified spontaneous emission free-electron laser (SASE-FEL). The main purpose of the experiment will be the production of short electron bunches as long as few SASE cooperation lengths and to validate scaling laws to foresee operation at shorter wavelength in the future operation with SPARX. We present in this paper start to end simulations of the expected FEL performance and discuss the layout of the machine, including the diagnostics to measure the FEL pulse length and other aspects of FEL performance. The experience gained from this experiment, will help in the configuration of the VUV and X-ray FEL SPARX to obtain FEL pulses below 10 fs.
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| THDAU05 |
Progress with FEL-based Coherent Electron Cooling
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529 |
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- V. Litvinenko, I. Ben-Zvi, M. Blaskiewicz, A. V. Fedotov, Y. Hao, A. Kayran, E. Pozdeyev, D. Trbojevic, G. Wang
BNL, Upton, Long Island, New York
- G. I. Bell, D. L. Bruhwiler, A. V. Sobol
Tech-X, Boulder, Colorado
- Y. S. Derbenev
JLAB, Newport News, Virginia
- S. Reiche
UCLA, Los Angeles, California
- O. A. Shevchenko, N. Vinokurov
BINP SB RAS, Novosibirsk
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Cooling intense high-energy hadron beams remains a major challenge for accelerator physics. Synchrotron radiation is too feeble, while efficiency of two other cooling methods falls rapidly either at high bunch intensities (i.e. stochastic cooling of protons) or at high energies (i.e. e-cooling). Possibility of coherent electron cooling based on high-gain FEL and ERL was presented at last FEL conference*. This scheme promises significant increases in luminosities of modern high-energy hadron and electron-hadron colliders, such as LHC and eRHIC. In this talk we present progress in development of this concept, results of analytical and numerical evaluation of the concept as well our prediction for LHC and RHIC. We also present our plan and design for proof-of-principle experiment at RHIC using existing R&D ERL.
* V. N.Litvinenko, Y. S. Derbenev, Proc. of 29th International FEL Conference, Novosibirsk, Russia, August 27-31, 2007, p.268, http://accelconf.web.cern.ch/accelconf/f07/HTML/AUTHOR. HTM
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Slides
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