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J. Kolonko

First Name: Jim

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Last Name: Kolonko

Full Name: J. Kolonko

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8 papers
title: The UCLA infrared free-electron laser
format: conference proceeding
conference: SPIE Conference on Intense Laser Beams
year: 1992
17 authors: J. W. Dodd | S. C. Hartman | S. Park | C. Pellegrini | J.B. Rosenzweig | J. A. Smolin | W. A. Barletta | D.B. Cline | R. K. Copper | J. Kolonko | J. G. Davis | G. Hairapetian | C. J. Joshi | N. C. Luhmann | S. N. Ivanchenkov | A. S. Khlebnikov | A. A. Varfolomeev
abstract: A compact 20 MeV linac with an RF laser-driven electron gun will drive a high-gain (10 cm gain length), 10.6 mu m wavelength FEL amplifier, operating in the SASE mode. FEL physics in the high-gain regime will be studied, including start-up from noise, optical guiding, sidebands, saturation, and superradiance, with emphasis on the effects important for future short wavelength operation of FELs. The hybrid undulator, designed and built at the Kurchatov Institute of Atomic Energy in the USSR has forty periods, each 1.5 cm long, the magnetic material is a hybrid combination of SmCo_5 blocks and Nd-Fe-B blocks, with vanadium-permendur yokes. The gap distance between pole-tips is fixed at 5 mm. On axis the peak value of the completed undulator's magnetic field was measured to be 7.3 kGauss (+/- 0.25%). Measurements during the conditioning phase of the RF gun for the electron beam's peak dark-current show 6 mA without the longitudinal magnetic focusing field in the gun and 34 mA with the focusing field active. The peak current from photoemission is calculated to be 200 A.
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title: The UCLA compact infrared free-electron laser
format: conference proceeding
conference: FEL 1991 13th
year: 1992
16 authors: J. W. Dodd | S. C. Hartman | S. Park | C. Pellegrini | J.B. Rosenzweig | D.B. Cline | G. Hairapetian | J. Kolonko | Smolin, J. A. | P.G. Davis | C. J. Joshi | N. Luhmann | S. N. Ivanchenkov | A. S. Khlebnikov | A. A. Varfolomeev | W. Barletta
abstract: The authors present the status of a compact infrared free-electron laser, driven by a 20 MeV, S-band linac with a photoinjector. The 60 cm long hybrid undulator has a 1.5 cm period and a field on axis of 7.3 kG. The FEL will operate at 10.6 mu m as a high-gain amplifier, to study the high-gain FEL regime including the effects of self amplified spontaneous emission, optical guiding and saturation. The linac is the prototype of the plane-wave transformer. TDA simulation of the FEL shows a gain length of 10 cm, and a saturation power of 50 MW. (18 References).
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title: Saturnus: the UCLA infrared free-electron laser project
format: conference proceeding
conference: PAC 1991
year: 1991
17 authors: J. W. Dodd | S. C. Hartman | S. Park | C. Pellegrini | J.B. Rosenzweig | Smolin, J. A. | G. Hairapetian | J. Kolonko | W. Barletta | D.B. Cline | J. G. Davis | C. J. Joshi | N. Luhmann | S. N. Ivanchenkov | A. S. Khlebnikov | Lachin, Y. Y. | A. A. Varfolomeev
abstract: A compact 20-MeV linac with an RF laser-driven electron gun will be used to drive a high-gain (10-cm gain length), 10.6- mu m wavelength FEL (free-electron laser) amplifier, operating in the SASE mode. Saturnus will mainly be used to study FEL physics in the high-gain regime, including start-up from noise, optical guiding, sidebands, saturation, and superradiance, with emphasis on the effects important for future short-wavelength operation of FELs. The primary magnetic flux is provided by C-shaped iron yokes, where between the poles thin blocks of neodymium-iron-boron magnets are placed to provide additional magnetic flux along the undulator axis. (9 References).
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title: Photocathode driven linac at UCLA for FEL and plasma wakefield acceleration experiments
format: conference proceeding
conference: PAC 1991
year: 1991
17 authors: S. Hartman | F. Aghamir | W. Barletta | D. B. Cline | J. Dodd | T. Katsouleas | J. Kolonko | S. Park | C. Pellegrini | J.B. Rosenzweig | Smolin, J. A. | Terrien, C. | J. Davis | G. Hairapetian | C. Joshi | N. Luhmann | D. McDermott
abstract: The UCLA compact 20-MeV/c electron linear accelerators is designed to produce a single electron bunch with a peak current of 200 A, an RMS energy spread of 0.2% or less, and a short 1.2-ps RMS pulse duration. The linac is also designed to minimize emittance growth down the beamline so as to obtain emittances on the order of 8 pi mm-mrad in the experimental region. The linac will feed two beamlines, the first will run straight into the undulator for FEL experiments while the second will be used for diagnostics, longitudinal bunch compression and other electron beam experiments. A description is given of the considerations that went into the design of the accelerating structures and the transport to the experimental areas. (8 References).
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title: A high luminosity superconducting mini collider for phi meson production and particle beam physics
format: conference proceeding
conference: PAC 1991
year: 1991
14 authors: C. Pellegrini | D. Robin | D. B. Cline | J. Kolonko | S. Anderson | W. Barletta | Chargin, A. | M. Cornacchia | Dalbacka, G. | K. Halbach | Lueng, E. | Kimball, F. | Madura, D. | Patterson, L.
abstract: A 510-MeV electron-positron collider has been proposed at the University of California at Los Angeles to study particle beam physics and phi-meson physics at luminosities larger than 1032 cm/sup -2/s/sup -1/. The collider consists of a single compact superconducting storage ring (SMC), with a bending field of 4 T and a current larger than 1 A. A discussion is presented of the main characteristics of this system and its major technical components: superconducting dipoles and the RF vacuum and injection systems. (6 References).
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title: Saturnus: the UCLA compact infrared free-electron laser project
format: conference proceeding
conference: Intense Microwave and Particle Beams II
year: 1991
16 authors: J. W. Dodd | F. Aghamir | W. Barletta | D. B. Cline | S. C. Hartman | T. C. Katsouleas | J. Kolonko | S. Park | C. Pellegrini | P. G. Davis | C. J. Joshi | N. C. Luhmann | D. B. McDermott | S. N. Ivanchenkov | YuYu Lachin | A. A. Varfolomeev
abstract: Saturnus is an infrared FEL operating in the 10 mu m wavelength region, driven by a compact 20 MeV linac with a photoinjector, under construction at UCLA. The 1.5 cm period, 0.6 T peak field undulator is being built at the Kurchatov IAE. The FEL is designed to operate primarily in the self amplified spontaneous emission mode. The authors plan to study the start-up from noise, optical guiding, saturation, sidebands and superradiance, with emphasis on the effects important for future short wavelength operation of FEL's. The photoinjector follows closely the Brookhaven design. Electrons are injected into an accelerating section based on the plane-wave-transformer design developed by Swenson at SAIC. Simulation of the linac and FEL show a gain length of 10 cm, and a saturation power of 50 MW. (13 References).
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title: Saturnus: the UCLA high-gain infrared FEL project
format: conference proceeding
conference: FEL 1990 12th
year: 1991
17 authors: F. Aghamir | W. Barletta | D.B. Cline | J. W. Dodd | S. C. Hartman | T.C. Katsouleas | J. Kolonko | S. Park | C. Pellegrini | Terrien, C. | J. G. Davis | C. J. Joshi | N. Luhmann | D. B. McDermott | S. N. Ivanchenkov | Lachin, Y. Y. | A. A. Varfolomeev
abstract: The authors present the status of Saturnus: an infrared FEL operating in the 10 mu m wavelength region, driven by a compact 20 MeV linac with a photoinjector, under construction at UCLA. The 1.5 cm period, 0.5 T peak-field undulator is being built at the Kurchatov IAE. The FEL is being designed to operate primarily in the self-amplified spontaneous emission mode. They plan to study the startup from noise, optical guiding, saturation, sidebands and superradiance, with emphasis on the effects important for future short-wavelength operation of FELs. The photoinjector follows closely the Brookhaven design. Electrons are injected into an accelerating section based on the plane-wave transformer design developed by Swenson at SAIC. Simulation of the linac and FEL show a gain length of 10 cm, and saturation power of 50 MW. (10 References).
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title: The UCLA IR-FEL
format: conference proceeding
conference: IEEE International Conference on Plasma Science 1990
year: 1990
11 authors: F. Aghamir | W. Barletta | D. B. Cline | J. Dodd | S. Hartman | C. Joshi | J. Kolonko | N. Luhmann | D. McDermott | C. Pellegrini | C. Terrien
abstract: A high-brightness RF gun operating at 2.856 GHz is being used as the injector for an IR-FEL (free-electron laser) experiment. The RF gun consists of a disk loaded, 1.5 cell cavity and a photocathode in the end wall of the cavity. A strong electric field within the half cell near the photocathode quickly accelerates the electrons, thus preventing emittance blow-up. The photocathode is to be driven by a Nd:YAG laser system producing a 10-ps pulse. The power for the RF gun will be supplied by a 25-MW klystron. The RF power is coupled to the cavity via an S-band waveguide attached to the sidewall of the gun. The TE_10 mode excited in the waveguide strongly couples to the pi-mode with the RF gun while the zero mode is suppressed. (0 References).
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