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H. Badakov

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Last Name: Badakov

Full Name: H. Badakov

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21 papers
title: Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold
format: journal article
publisher: Physics of Plasmas
year: 21 July 2010
11 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | N. Barov | P. Piot | R. Fliller | G.M. Kazakevich | J. Santucci | J. Li | R. Tikhoplav
abstract: Focusing of a 15 MeV electron bunch by a plasma lens operated at the threshold of the underdense regime has been demonstrated. The strong, 1.7 cm focal length, plasma lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. It is shown through analytic analysis and simulation that the observed spherical aberration of this underdense lens, when expressed as the fractional departure of the focusing strength from its linear expectation, is ?K/K=0.08�0.04. This is significantly lower than the minimum theoretical value for the spherical aberration of an overdense plasma lens. Parameter scans showing the dependence of focusing performance on beam charge, as well as time resolved measurements of the focused electron bunch, are reported.
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title: Breakdown Limits on Gigavolt-per-Meter Electron-Beam-Driven Wakefields in Dielectric Structures
format: journal article
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year: May 27, 2008
15 authors: M.C. Thompson | H. Badakov | A.M. Cook | J.B. Rosenzweig | R. Tikhoplav | G. Travish | I. Blumenfeld | M.J. Hogan | R. Ischebeck | N. Kirby | R. Siemann | D. Walz | P. Muggli | A. Scott | R.B. Yoder
abstract: First measurements of the breakdown threshold in a dielectric subjected to GV=m wakefields produced by short (30 330 fs), 28.5 GeV electron bunches have been made. Fused silica tubes of 100
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title: Status of the Fermi@Elettra Photoinjector
format: conference proceeding
conference: EPAC 2008
year: 2008
21 authors: M. Trovo | L. Badano | S. Biedron | D. Castronovo | F. Cianciosi | P. Craievich | M.D. Danailov | G.DAuria | M. Ferianis | S.V. Milton | G. Penco | L. Pivetta | L. Rumiz | D. Wang | M. Eriksson | D. Kumbaro | F. Lindau | H. Badakov | A. Fukasawa | B. O'Shea | J.B. Rosenzweig
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.
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title: Beam-Driven Dielectric Wakefield Accelerating Structure as a THz Radiation Source
format: preprint
year: 2007
9 authors: A. Kanareykin | O.B. Williams | R. Tikhoplav | A.M. Cook | H. Badakov | J.B. Rosenzweig | G. Travish | M.C. Thompson | R. J. England
abstract: Experimental work is planned to study the performance of a beam-driven cylindrical dielectric wakefield accelerating structure as a source of THz coherent Cerenkov radiation (CCR). For an appropriate choice of dielectric tube geometry and driving electron bunch parameters, the device operates in a single-mode regime, producing radiation in the THz range. This source can potentially produce high power levels relative to currently available sources, with ~50 uJ radiated energy per pulse achievable using the electron beam currently in operation at the Neptune advanced accelerator laboratory at UCLA (~13 MeV beam energy, ~200 um RMS bunch length, ~500 pC bunch charge). Preparations underway for installation of the experiment are discussed.
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title: DIELECTRIC WAKEFIELD ACCELERATOR EXPERIMENTS AT THE SABER FACILITY
format: preprint
year: 2007
17 authors: G. Travish | H. Badakov | A.M. Cook | J.B. Rosenzweig | R. Tikhoplav | A. Kanareykin | M.C. Thompson | M. K. Berry | I. Blumenfeld | F.J. Decker | M. Hogan | R. Ischebeck | R. Iverson | N. Kirby | R. Siemann | D. Walz | P. Muggli
abstract: Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric Wakefield Accelerators (DWA) such beams, having rms bunch length as short as 20 um, have been used to drive 100 um and 200 um ID hollow tubes above 20 GV/m surface fields. These FFTB tests enabled the measurement of a breakdown threshold in fused silica (with full data analysis still ongoing) [1]. With the construction and commissioning of the SABER facility at SLAC, new experiments would be made possible to test further aspects of DWAs including materials, tube geometrical variations, direct measurements of the Cerenkov fields, and proof of acceleration in tubes >10 cm in length. This collaboration will investigate breakdown thresholds and accelerating fields in new materials including CVD diamond. Here we describe the experimental plans, beam parameters, simulations, and progress to date as well as future prospects for machines based of DWA structures.
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title: The New Photoinjector for the Fermi Project
format: conference proceeding
conference: PAC 2007
year: 2007
14 authors: G. D'Auria | D. Bacescu | L. Badano | F. Cianciosi | P. Craievich | M. Danailov | G. Penco | L. Rumiz | M. Trovo' | A. Turchet | H. Badakov | A. Fukusawa | B. O'Shea | J.B. Rosenzweig
abstract: FERMI@elettra is a single-pass FEL user facility covering the spectral range 100-10 nm. It will be located near the Italian third generation Synchrotron Light Source facility ELETTRA and will make use of the existing 1.0 GeV normal conducting Linac [1]. To obtain the high beam brightness required by the project, the present Linac electron source will be substituted with a photocathode RF gun now under development in the framework of a collaboration between Sincrotrone Trieste (ST) and Particle Beam Physics Laboratory (PBPL) at UCLA. The new gun will use an improved design of the 1.6 cell accelerating structure already developed at PBPL, scaled to 2998 MHz. We expect that the new gun design will allow a beam brightness increase by a factor 3-4 over the older version of the device. Some technical choices of the new design, including the enhancement of the mode separation, removal of the RF tuners, full cell symmetrization to limit the dipole and quadrupole RF field as well as an improved solenoid yoke design for multipole field corrections, will be discussed.
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title: Observation of Multi-GeV Breakdown Thresholds in Dielectric Wakefield Structures
format: conference proceeding
conference: PAC 2007
year: 2007
12 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | M. Hogan | R. Ischebeck | N. Kirby | R. Siemann | D. Walz | P. Muggli | A. Scott | R. Yoder
abstract: An experiment designed to test the breakdown threshold of a dielectric subjected to the GV/m-scale electric-fields of an intense electron-beam has been completed. In this experiment at the Final Focus Test Beam (FFTB) facility, the 30 GeV SLAC electron beam was focused down and propagated through short fused-silica capillary-tubes with internal diameters of as little as 100 ?m. The electric field at the inner surface of the tubes was varied from about 1 GV/m to 22 GV/m by adjusting the longitudinal compres- sion of the electron bunch. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the multi-GV/m sur- faced fields that were sustained equate to on axis accelerat- ing field of several GV/m.
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title: OBSERVATIONS OF UNDERDENSE PLASMA LENS FOCUSING OF RELATIVISTIC ELECTRON BEAMS
format: conference proceeding
conference: PAC 2007
year: 2007
10 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | R. Fliller | G. M. Kazakevich | P. Piot | J. Santucci | J. Li | R. Tikhoplav
abstract: Focusing of a 15 MeV, 19 nC electron bunch by an un- derdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated in ex- periments at the Fermilab NICADD Photoinjector Labora- tory (FNPL). The strong 1.9 cm focal-length plasma-lens focused both transverse directions simultaneously and re- duced the minimum area of the beam spot by a factor of 23. Analysis of the beam-envelope evolution observed near the beam waist shows that the spherical aberrations of this un- derdense lens are lower than those of an overdense plasma lens, as predicted by theory. Correlations between the beam charge and the properties of the beam focus corroborate this conclusion.
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title: The FINDER Photoinjector
format: conference proceeding
conference: PAC 2007
year: 2007
6 authors: A. Fukasawa | H. Badakov | B. O'Shea | E. Hemsing | J.B. Rosenzweig | S. G. Anderson
abstract: The FINDER photoinjector was developed for the inverse Compton scattering experiment under UCLA- LLNL collaboration. The improvements of this gun from SPARC gun [1, 2] at INFN-LNF (Frascati) and previous UCLA versions of the 1.6 cell S-band photoinjector are detailed here. The gun is designed to have large mode separation to suppress 0 mode excitation which may be a cause of the emittance degradation. In an effort to reduce the RF quadrupole effect the full cell tuners are replaced by vacuum ports. The laser ports are also omitted. Two openings of the solenoid shield are added to top and bottom of it where there were only two openings on the sides. S11 of the cavity was presented. The on-axis electric field was measured by the bead drop method to show the good field balance. The magnetic field in the emittance compensation solenoid was measured and the quadrupole components were derived.
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title: Commissioning of a High-Brightness Photoinjector for Compton Scattering X-Ray Sources
format: conference proceeding
conference: PAC 2007
year: 2007
13 authors: S. G. Anderson | C. P. J. Barty | D. J. Gibson | F. V. Hartemann | M. Messerly | M. Shverdin | C. W. Siders | A. M. Tremaine | H. Badakov | P. Frigola | A. Fukasawa | B. O'Shea | J.B. Rosenzweig
abstract: Compton scattering of intense laser pulses with ultra- relativistic electron beams has proven to be an attractive source of high-brightness x-rays with keV to MeV ener- gies. This type of x-ray source requires the electron beam brightness to be comparable with that used in x-ray free- electron lasers and laser and plasma based advanced accel- erators. We describe the development and commissioning of a 1.6 cell RF photoinjector for use in Compton scatter- ing experiments at LLNL. Injector development issues such as RF cavity design, beam dynamics simulations, emit- tance diagnostic development, results of sputtered magne- sium photo-cathode experiments, and UV laser pulse shap- ing are discussed. Initial operation of the photoinjector is described.
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title: Observations of Underdense Plasma Lens Focusing of Relativistic Electron Beams
format: conference proceeding
conference: PAC 2007
year: 2007
10 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | R. Fliller | G.M. Kazakevich | P. Piot | J. Santucci | J. Li | R. Tikhoplav
abstract: Focusing of a 15 MeV, 19 nC electron bunch by an un- derdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated in ex- periments at the Fermilab NICADD Photoinjector Labora- tory (FNPL). The strong 1.9 cm focal-length plasma-lens focused both transverse directions simultaneously and re- duced the minimum area of the beam spot by a factor of 23. Analysis of the beam-envelope evolution observed near the beam waist shows that the spherical aberrations of this un- derdense lens are lower than those of an overdense plasma lens, as predicted by theory. Correlations between the beam charge and the properties of the beam focus corroborate this conclusion.
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title: Dielectric Wakefield Accelerator Experiments at the Saber Facility
format: conference proceeding
conference: PAC 2007
year: 2007
17 authors: G. Travish | H. Badakov | A.M. Cook | J.B. Rosenzweig | R. Tikhoplav | A. Kanareykin | M.C. Thompson | M.K. Berry | I. Blumenfeld | F.J. Decker | M.J. Hogan | R. Ischebeck | R. Iverson | N. Kirby | R. Siemann | D. Walz | P. Muggli
abstract: Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric Wakefield Accelerators (DWA) such beams, having rms bunch length as short as 20 um, have been used to drive 100 um and 200 um ID hollow tubes above 20 GV/m surface fields. These FFTB tests enabled the measurement of a breakdown threshold in fused silica (with full data analysis still ongoing) [1]. With the construction and commissioning of the SABER facility at SLAC, new experiments would be made possible to test further aspects of DWAs including materials, tube geometrical variations, direct measurements of the Cerenkov fields, and proof of acceleration in tubes >10 cm in length. This collaboration will investigate breakdown thresholds and accelerating fields in new materials including CVD diamond. Here we describe the experimental plans, beam parameters, simulations, and progress to date as well as future prospects for machines based of DWA structures.
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title: Beam-driven Dielectric Wakefield Accelerating Structure as a Thz Radiation Source
format: conference proceeding
conference: PAC 2007
year: 2007
9 authors: A.M. Cook | H. Badakov | R.J. England | J.B. Rosenzweig | R. Tikhoplav | G. Travish | O.B. Williams | M.C. Thompson | A. Kanareykin
abstract: Experimental work is planned to study the performance of a beam-driven cylindrical dielectric wakefield accelerat- ing structure as a source of THz coherent Cerenkov radi- ation (CCR). For an appropriate choice of dielectric tube geometry and driving electron bunch parameters, the de- vice operates in a single-mode regime, producing radiation in the THz range. This source can potentially produce high power levels relative to currently available sources, with ?50 ?J radiated energy per pulse achievable using the elec- tron beam currently in operation at the Neptune advanced accelerator laboratory at UCLA ( ?13 MeV beam energy, ?200 ?m RMS bunch length, ?500 pC bunch charge). Preparations underway for installation of the experiment are discussed.
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title: Observation of Multi-GeV Breakdown Thresholds in Dielectric Wakefield Structures
format: conference proceeding
conference: PAC 2007
year: 2007
12 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | M.J. Hogan | R. Ischebeck | N. Kirby | R. Siemann | D. Walz | P. Muggli | A. Scott | R. Yoder
abstract: An experiment designed to test the breakdown threshold of a dielectric subjected to the GV/m-scale electric-fields of an intense electron-beam has been completed. In this experiment at the Final Focus Test Beam (FFTB) facility, the 28.5 GeV SLAC electron beam was focused down and propagated through short fused-silica capillary-tubes with internal diameters of as little as 100 ?m. The electric field at the inner surface of the tubes was varied from about 1 GV/m to 22 GV/m by adjusting the longitudinal compres- sion of the electron bunch. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the multi-GV/m sur- faced fields that were sustained equate to on axis accelerat- ing field of several GV/m.
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title: DIELECTRIC WAKEFIELD ACCELERATOR EXPERIMENTS AT THE SABER FACILITY
format: conference proceeding
conference: PAC 2007
year: 2007
17 authors: G. Travish | H. Badakov | A.M. Cook | J.B. Rosenzweig | R. Tikhoplav | A. Kanareykin | M.C. Thompson | M. K. Berry | I. Blumenfeld | F.-J. Decker | M. J. Hogan | R. Ischebeck | R. Iverson | N. Kirby | R. Siemann | D. Walz | P. Muggli
abstract: Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric Wakefield Accelerators (DWA) such beams, having rms bunch length as short as 20 um, have been used to drive 100 um and 200 um ID hollow tubes above 20 GV/m surface fields. These FFTB tests enabled the measurement of a breakdown threshold in fused silica (with full data analysis still ongoing) [1]. With the construction and commissioning of the SABER facility at SLAC, new experiments would be made possible to test further aspects of DWAs including materials, tube geometrical variations, direct measurements of the Cerenkov fields, and proof of acceleration in tubes >10 cm in length. This collaboration will investigate breakdown thresholds and accelerating fields in new materials including CVD diamond. Here we describe the experimental plans, beam parameters, simulations, and progress to date as well as future prospects for machines based of DWA structures.
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title: Dielectric Wakefield Accelerating Structure as a Source of Terahertz Coherent Cerenkov Radiation
format: conference proceeding
conference: AAC 2006 12th
year: 2006
8 authors: A.M. Cook | J.B. Rosenzweig | M.C. Thompson | H. Badakov | G. Travish | R. Tikhoplav | O.B. Williams | R. J. England
abstract: We discuss future experimental work proposed to study the performance of a cylindrical dielectric wakefield accelerating structure as a coherent Cerenkov radiation source at the Neptune laboratory at UCLA. The Cerenkov wakefield acceleration experiment carried out recently by UCLA/SLAC/USC, using the ultrashort and high charge beam (Q = 3 nC, RMS bunch length = 20 micron) at the SLAC FFTB, demonstrated electromagnetic wakes at the few GV/m level. The motivation of our prospective experiment is to investigate the operation of a similar scenario using the comparatively long pulse, low charge beam (Q = 0.5 nC, RMS bunch length = 200 micron) at UCLA Neptune. The field amplitude produced in this setup would be one to two orders of magnitude lower, at the few tens to few 100 MV/m level. Such a decelerating field would extract a significant amount of energy from a low-energy beam in a distance on the order of a few centimeters, allowing the use of short dielectric structures. We discuss details of the geometry and composition of the structures to be used in the experiment. We also examine the possibility of a future dedicated facility at UCLA Neptune based on a hybrid photoinjector currently in development. The intrinsic bunch compression capabilities and improved beam parameters (RMS bunch length = 100 micron, Q = 1 nC) of the photoinjector would allow the creation of a high power radiation source in the terahertz regime.
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title: Ultra-high gradient dielectric wakefield accelerator experiments
format: conference proceeding
conference: AAC 2006 12th
year: 2006
12 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | M. Hogan | R. Ischebeck | N. Kirby | R. Siemann | D. Walz | P. Muggli | A. Scott | R. Yoder
abstract: Ultra-high gradient dielectric wakefield accelerators are a potential option for a linear collider afterburner since they are immune to the ion collapse and electron/positron asymmetry problems implicit in a plasma based afterburner. The first phase of an experiment to study the performance of dielectric Cerenkov wakefield accelerating structures at extremely high gradients in the GV/m range has been completed. The experiment took advantage of the unique SLAC FFTB electron beam and its ultra-short pulse lengths and high currents (e.g., ?z = 20 ?m at Q = 3 nC). The FFTB electron beam was successfully focused down and sent through short lengths of fused silica capillary tubing (ID = 200 ?m / OD = 325 ?m). The pulse length of the electron beam was varied to produce a range of electric fields between 2 and 20 GV/m at the inner surface of the dielectric tubes. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the surfaced fields that were sustained equate to on axis accelerating field of several GV/m. In future experiments being developed for the SLAC SABER and BNL ATF we plan to use the coherent Cerenkov radiation emitted from the capillary tube as a field strength diagnostic and demonstrate GV/m range particle energy gain.
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title: PRELIMINARY RESULTS FROM THE UCLA/SLAC ULTRA-HIGH GRADIENT CERENKOV WAKEFIELD ACCELERATOR EXPERIMENT
format: conference proceeding
conference: Erice 2005
year: 2006
12 authors: M.C. Thompson | H. BADAKOV | J.B. Rosenzweig | G. Travish | M. Hogan | R. Ischebeck | N. Kirby | P. Muggli | A. Scott | R. Siemann | D. Walz | R. Yoder
abstract: The first phase of an experiment to study the performance of dielectric Cerenkov wakefield accelerating structures at extremely high gradients in the GV/m range has been completed. This experiment takes advantage of the unique SLAC FFTB electron beam and its demonstrated ultra-short pulse lengths and high currents (e.g., ?z = 20 ?m at Q = 3 nC). The FFTB electron beam has been successfully focused down and sent through varying lengths of fused silica capillary tubing with two different sizes: ID = 200 ?m / OD = 325 ?m and ID = 100 ?m / OD = 325 ?m. The pulse length of the electron beam was varied in the range 20 ?m < ?z < 100 ?m which produced a range of electric fields between 2 and 20 GV/m at the inner surface of the dielectric tubes. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the surfaced fields that were sustained equate to on axis accelerating field of several GV/m. In future experiments we plan to collect and measure coherent Cerenkov radiation emitted from the capillary tube to gain more information about the strength of the accelerating fields.
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title: RESULTS FROM THE UCLA/FNPL UNDERDENSE PLASMA LENS EXPERIMENT
format: conference proceeding
conference: Erice 2005
year: 2006
11 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | H. Edwards | R. Fliller | G. M. Kazakevich | P. Piot | J. Santucci | J. Li | R. Tikhoplav
abstract: A gaussian underdense plasma lens with peak density 5 x 1012 cm?3 and a full width half maximum (FWHM) length of 2.2 cm has been used to focus a relativistic electron beam. This plasma lens is equivalent in strength to a quadrupole magnet with a 150 T/m field gradient. The lens focused a 15 MeV, 16 nC electron beam with initial dimensions ?x,y ? 650 ?m and ?z ? 6.5 mm onto an optical transition radiation (OTR) screen ?2 cm downstream of the lens. The average transverse area of the plasma focused electron beam was typically demagnified by a factor of 23. The evolution of the beam envelope in the area near the beam waist was measured for both round beams and asymmetric beams with x:y aspect ratios as large as 1:5. The light from the OTR screen in the round beam case was also imaged into a streak camera in order to directly measure the correlation between z and ? within the beam.
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title: The UCLA/FNPL Time Resolved Underdense Plasma Lens Experiment
format: conference proceeding
conference: PAC 2005
year: 2005
11 authors: M.C. Thompson | H. Badakov | J.B. Rosenzweig | G. Travish | H. Edwards | R. Fliller | G. M. Kazakevich | P. Piot | J. Santucci | J. Li | R. Tikhoplav
abstract: A gaussian underdense plasma lens with peak density 5 � 1012cm-3and a full width half maximum (FWHM) length of 2.2 cm has been used to focus a relativistic electron beam. This plasma lens has a focusing strength equivalent to a quadrupole magnet with a 150 T/m field gradient. The lens focused a 15 MeV, 16 nC electron beam with initial dimensions ?r= 500 ?m and ?z= 5 mm onto an optical transition radiation (OTR) screen 2 cm downstream of the lens. The average transverse area of the plasma focused electron beam was typically demagnified by a factor of 22. The light from the OTR screen was imaged into a streak camera in order to directly measure the correlation between z and ?rwithin the beam.
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title: Considerations for Conical Horn Antenna Design optimizing Cerenkov radiation from hollow cylindrical dielectric tube
format: tech note
year: 2004
1 author: H. Badakov
abstract:
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