Section Navigation

Browse



logged in as: pbpl
logout
list users
D.B. Cline

First Name: David

Middle Name: B.

Last Name: Cline

Full Name: D.B. Cline

24-tag-hot tags:


view citation format

29 papers
title: Experimental Characterization of the Transverse Phase Space of a 60-MeV Electron Beam through a Compressor Chicane
format: conference proceeding
conference: PAC 2007
year: 2007
8 authors: F. Zhou | A. Kabel | J.B. Rosenzweig | R. Agustsson | G. Andonian | D. Cline | A. Murokh | V. Yakimenko
abstract: Space charge and coherent synchrotron radiation may deteriorate electron beam quality when the beam passes through a magnetic bunch compressor. This paper presents the transverse phase-space tomographic measurements for a compressed beam at 60MeV, around which energy the first stage of magnetic bunch compression takes place in most advanced linacs. Transverse phase-space bifurcation of a compressed beam is observed at that energy, but the degree of the space charge-induced bifurcation is appreciably lower than the one observed at 12MeV.
keywords: pbpl  
Download | Details | Edit | Delete
title: Experimental characterization of the transverse phase space of a 60-MeV electron beam through a compressor chicane
format: journal article
publisher:
year: 2006
8 authors: F. Zhou | A. Kabel | J.B. Rosenzweig | R. Agustsson | G. Andonian | D. Cline | A. Murokh | V. Yakimenko
abstract: Space charge and coherent synchrotron radiation may deteriorate electron beam quality when the beam passes through a magnetic bunch compressor. This paper presents the transverse phase-space tomographic measurements for a compressed beam at 60 MeV, around which energy the first stage of magnetic bunch compression takes place in most advanced linacs. Transverse phase-space bifurcation of a compressed beam is observed at that energy, but the degree of the space charge-induced bifurcation is appreciably lower than the one observed at 12 MeV.
keywords: pbpl  
Download | Details | Edit | Delete
title: Experimental Characterization of 4-D Transverse Phase-Space of a Compressed Beam
format: conference proceeding
conference: PAC 2005
year: 2005
8 authors: F. Zhou | R. Agustsson | G. Andonian | D. Cline | A. Murokh | J.B. Rosenzweig | I. Ben-Zvi | V. Yakimenko
abstract: Coherent synchrotron radiation (CSR) may severely deteriorate electron beam qualities, such as distortion of energy spectrum and transverse phase-space in the bending plane when the beam transports through a magnetic bunch compressor. Recently some laboratories conducted some investigations on CSR effects but mostly focused on the measurements of emittance growth and energy spread and or/ energy loss. However, these parameters may not completely represent a fully compressed beam because its phase spaces may be severely distorted and thus some information may be lost if only these basic parameters are used. It is preferred to reconstruct six-dimensional phase spaces of a compressed beam using tomographic techniques in order to fully understand a beam affected by CSR effects. This report will focus on the four-dimensional transverse phase-space tomographic measurements for a fully compressed beam at 60-MeV energy. Its experimental characterizations at different beam parameters are preliminarily examined.
keywords: pbpl  
Download | Details | Edit | Delete
title: Beam extraction studies at 900 GeV using a channeling crystal
format: journal article
publisher: Physical Review Special Topics-Accelerators & Beams
year: 2002
26 authors: R. Carrigan | D. Chen | G. Jackson | N. Mokhov | C.T. Murphy | S. I. Baker | S. A. Bogacz | D. B. Cline | S. Ramachandran | J. Rhoades | J.B. Rosenzweig | A. Asseev | R. A. Biryukov | A. Taratin | J. A. Ellison | A. Khanzadeev | T. Prokofieva | V. Samsonov | G. Solodov | B. Newberger | E. Tsyganov | H. J. Shih | W. Gabella | B. Cox | V. Golovatyuk | A. McManus
abstract: Luminosity-driven channeling extraction has been observed for the first time in a 900 GeV study at the Fermilab Tevatron. This experiment, Fermilab E853, demonstrated that useful TeV level beams can be extracted from a superconducting accelerator during high luminosity collider operations without unduly affecting the background at the collider detectors. Multipass extraction was found to increase the efficiency of the process significantly. The beam extraction efficiency was about 25%. Studies of time dependent effects found that the turn-to-turn structure was governed mainly by accelerator beam dynamics. Based on the results of this experiment, it is feasible to construct a parasitic 5?10 MHz proton beam from the Tevatron collider.
keywords:
Download | Details | Edit | Delete
title: First observation of luminosity-driven extraction using channeling with a bent crystal
format: journal article
publisher: Physical Review Special Topics-Accelerators & Beams
year: 1998
26 authors: R. Carrigan | D. Chen | G. Jackson | N. Mokhov | C.T. Murphy | S. I. Baker | S. A. Bogacz | D. B. Cline | S. Ramachandran | J. Rhoades | J.B. Rosenzweig | A. Asseev | R. A. Biryukov | A. Taratin | J. A. Ellison | A. Khanzadeev | T. Prokofieva | V. Samsonov | G. Solodov | B. Newberger | E. Tsyganov | H. J. Shih | W. Gabella | B. Cox | V. Golovatyuk | A. McManus
abstract: Luminosity-driven channeling extraction has been observed for the first time using a 900 GeV circulating proton beam at the superconducting Fermilab Tevatron. The extraction efficiency was found to be about 30%. A 150 kHz beam was obtained during luminosity-driven extraction with a tolerable background rate at the collider experiments. A 900 kHz beam was obtained when the background limits were doubled. This is the highest energy at which channeling has been observed.
keywords:
Download | Details | Edit | Delete
title: First Observation of Luminosity-Driven Extraction Using Channeling with a Bent Crystal
format: preprint
year: 1998
26 authors: A. Asseev | S. I. Baker | S. A. Bogacz | R. A. Biryukov | R.A. Carrigan | D. Chen | D. B. Cline | B. Cox | J. A. Ellison | W. Gabella | V. Golovatyuk | G. Jackson | A. Khanzadeev | A. McManus | N. Mokhov | C.T. Murphy | B. Newberger | T. Prokofieva | S. Ramachandran | J. Rhoades | J.B. Rosenzweig | V. Samsonov | H. J. Shih | G. Solodov | A. Tartin | E. Tsyganov
abstract: Luminosity-driven channeling extraction has been observed for the first time from a 900 GeV circulating proton beam at the Fermilab Tevatron. The extraction efficiency was found to be of he order of 30%. A 150 kHz beam was obtained during luminosity-driven extraction with a tolerable background rate at the collider experiments, and a 900 kHz beam was obtained when background limits were doubled. This is the highest energy at which channeling has been observed.
keywords:
Download | Details | Edit | Delete
title: First results from bent crystal extraction at the Fermilab Tevatron
format: journal article
publisher: Nuclear Instruments & Methods B
year: 1996
27 authors: C.T. Murphy | R. Carrigan | D. Chen | G. Jackson | N. Mokhov | H. J. Shih | B. Cox | V. Golovatyuk | A. McManus | A. Bogacz | D. B. Cline | S. Ramachandran | J. Rhoades | J.B. Rosenzweig | B. Newberger | J. A. Ellison | S. Baker | C. R. Sun | W. Gabella | E. Tsyganov | A. Taratin | A. Asseev | V. Biryukov | A. Khanzadeev | T. Prokofieva | V. Samsonov | G. Solodov
abstract: First results from Fermilab Experiment 853 are presented. E853 is an experiment to test the feasibility and efficiency of extracting a low-intensity beam from the halo of the Tevatron using channeling in a bent silicon crystal. The motivation of the experiment is to apply crystal extraction to trans-TeV accelerators like the LHC. Extensive simulation work has been carried out. Two accelerator operating modes have been developed for crystal studies, ''kick'' mode and diffusion mode. Results from the first successful extraction in kick mode are presented.
keywords:
Download | Details | Edit | Delete
title: Progress on Plasma Lens Experiments at the Final Focus Test Beam
format: conference proceeding
conference: PAC 1995
year: 1995
34 authors: P. Kwok | Chen, P. | D. B. Cline | W. Barletta | Berridge, S. | Bugg, W. | Bula, C. | S. Chattopadhyay | Craddock, W. | Hsu, I. | R. Iverson | T. Katsouleas | Lai, P. | Leemans, W. | Liou, R. | McDonald, K. T. | D. Meyerhofer | Nakajima, K. | Nakanishi, H. | Ng, C. K. | Nishida, Y. | Norem, J. | A. Ogata | J.B. Rosenzweig | Ross, M. | Sessler, A. M. | Shintake, T. | Spencer, J. | Su, J. J. | Weidemann, A. W. | Westenskow, G. | D. Whittum | Williams, R. | J. Wurtele
abstract: The proposal to perform a series of plasma lens experiments at the Final Focus Test Beam at SLAC has been described earlier. We report on our progress towards validation of concepts involved in the experiments, including the laser ionized plasma production test, development of the supersonic gas jet as the plasma source, and study on focused beam size measurement techniques. Most importantly, the effects of background events due to plasma lenses in future linear collider detectors, such as that in the NLC, are studied in details and are shown to be within detector tolerances.
keywords:
Download | Details | Edit | Delete
title: Plasma Lens Experiments at the Final Focus Test Beam
format: conference proceeding
conference: PAC 1993
year: 1995
33 authors: R. Lieu | W. Barletta | S. Chattopadhyay | P. Chen | D. B. Cline | W. Craddock | W. Gabella | I. Hsu | R. Iverson | T. Katsouleas | P. Kwok | P. Lai | W. Leemans | R. Liou | D. Meyerhofer | K. Nakajima | H. Nakanishi | C. K. Ng | Y. Nishida | J. Norem | A. Ogata | S. Rajagopalan | T. Shintake | J.B. Rosenzweig | M. Ross | A. Sessler | J. Spencer | J. J. Su | N. Walker | G. Westenskow | D. Whittum | R. Williams | J. Wurtele
abstract: We intend to carry out a series of plasma lens experiments at the Final Focus Test Beam facility at SLAC. These experiments will be the first to study the focusing of particle beams by plasma focusing devices in the parameter regime of interest for high energy colliders, and is expected to lead to plasma lens designs capable of unprecedented spot sizes. Plasma focusing of positron beams will be attempted for the first time. We will study the effects of lens aberrations due to various lens imperfections. Several approaches will be applied to create the plasma required including laser ionization and beam induced tunneling ionization of a working gas - the latter which has never been observed before. The compactness of our device should prove to be of interest for applications at the SLC and the next generation linear colliders.
keywords:
Download | Details | Edit | Delete
title: Extraction from TeV-Range Accelerators Using Bent Crystal Channeling
format: journal article
publisher: Nuclear Instruments & Methods B
year: 1994
45 authors: R.A. Carrigan | D. Chen | P. Colestock | D. Herrup | G. Goderre | G. Jackson | C.T. Murphy | R. Stefanski | S. Baker | N. Mokhov | B. Parker | H. J. Shih | R. Soundranayagam | T. Toohig | S. Peggs | C. R. Sun | A. Boden | D. B. Cline | W. Gabella | S. Ramachandran | J. Rhoades | J.B. Rosenzweig | M. Arenton | S. Conetti | B. Cox | D. Dukes | V. Golovatyuk | A. McManus | K. Nelson | B. Norem | B. Newberger | J. A. Ellison | A. Erwin | R. Rossmanith | A. Kovalenko | A. Taratin | N. Malakhov | E. Tsyganov | M. Bavizhev | V. Biryukov | M. Maslov | A. Khanzadeev | T. Prokofieva | V. Samsonov | G. Solodov
abstract: Plans and first results from Fermilab Experiment 853 are presented. E853 is an experiment to test the feasibility and efficiency of extracting a low-intensity beam from the halo of the Tevatron using channeling in a bent silicon crystal. The motivation of the experiment is to apply crystal extraction to trans-TeV accelerators like the LHC. Channeling developments related to crystal extraction and some early results from accelerator studies at the Tevatron are presented.
keywords:
Download | Details | Edit | Delete
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.
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
title: Plasma Lenses for SLAC Final Focus Test Facility
format: conference proceeding
conference: PAC 1991
year: 1991
11 authors: D. Betz | Chen, P. | D. B. Cline | Gundersen, M. | C. Joshi | T. Katsouleas | Norem, J. | Rajagopalan, S. | J.B. Rosenzweig | Su, J. J. | Williams, R.
abstract: A collaborative group of accelerator and plasma physicists and engineers has formed with an interest in exploring the use of plasma lenses to meet the needs of future colliders. Analytic and computational models of plasma lenses are briefly reviewed and several design examples for the SLAC Final Focus Test Beam are presented. The examples include discrete, thick, and adiabatic lenses. A potential plasma source with desirable lens characteristics is presented.
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
title: A high-luminosity BB factory linear collider using positron recirculation and recovery
format: journal article
publisher: Nuclear Instruments & Methods A
year: 1990
2 authors: D. B. Cline | C. Pellegrini
abstract: The authors describe an asymmetric linear collider BB factory scheme that offers a possible solution to most of the problems encountered in the design of BB factories to operate at the Upsilon (4S) energy. A key feature of this collider is the recirculation and recovery of the positrons and the asymmetric energy of the collider to better achieve the search for CP violation in the B system. (8 References).
keywords:
Download | Details | Edit | Delete
title: A linear collider phi factory and beam dynamics test machine
format: conference proceeding
conference: Workshop on CP Violation in Particle Physics and Astrophysics
year: 1990
8 authors: W.A. Barletta | R. C. Berg | A. Boden | C. Buchanan | D.B. Cline | A. Fridman | C. H. Ho | C. Pellegrini
abstract: The authors present the design of a high luminosity linear collider phi factory. This machine can be used to search for violation of CPT invariance and the study of CP violation (epsilon). It can also serve as a test collider to study the feasibility of L > 10(34) cm(-2) sec(-1) BB factory and the beam dynamics of large disruption systems. The machine will be asymmetric in beam energy, thus giving the phi's a boost.
keywords:
Details | Edit | Delete
title: Experimental observation of plasma wake-field acceleration
format: journal article
publisher: Physical Review Letters
year: 1988
9 authors: J.B. Rosenzweig | D.B. Cline | B. Cole | H. Figueroa | W. Gai | R. Konecny | J. Norem | P. Schoessow | J. Simpson
abstract: The authors report the first experimental test of the physics of plasma wake-field acceleration performed at the Argonne National Laboratory Advanced Accelerator Test Facility. Megavolt-per-meter plasma wake fields are excited by a intense 21-MeV, multipicosecond bunch of electrons in a plasma of density n/sub e/ approximately=10/sup 13/ cm/sup -3/, and probed by a low-intensity 15-MeV witness pulse with a variable delay time behind the intense bunch. Accelerating and deflecting wake-field measurements are presented, and the results compared to theoretical predictions. (8 References).
keywords:
Download | Details | Edit | Delete
title: The UW/ANL plasma wake-field acceleration experiment
format: conference proceeding
conference: PAC 1987
year: 1987
5 authors: J.B. Rosenzweig | D.B. Cline | Cole, B. | Detra, J. | Sealy, P.
abstract: An experiment designed to test the physics of the plasma wake-field accelerator (PWFA) using the ANL (Argonne National Laboratory) Advanced Accelerator Test Facility is described. A discussion of theoretical predictions is followed by a status report on the experimental study of the plasma source and diagnostics, the beam diagnostics, and the computer control and data acquisition. The experimental goals are briefly examined. (8 References).
keywords:
Download | Details | Edit | Delete
title: Transverse Focussing Using Plasma Wake Fields
format: conference proceeding
conference: PAC 1987
year: 1987
4 authors: D.B. Cline | Cole, B. | J.B. Rosenzweig | Norem, J.
abstract: Dense particle beams travelling in plasmas can produce very high electric and magnetic fields, and these fields, described by Chen and others can be used to accelerate and focus particles. The effects on trailing beams and self focussing can be strong and nonlinear. This paper discusses two aspects of self pinching beams: 1) the production of beams which do not self pinch, and 2) a short focal length plasma lens which uses self pinching to reduce beam sizes at the interaction point of a linear collider. As an example, we consider a final focus system for the Stanford Linear Collider, considering plasma production, vacuum system and backgrounds, and show how the luminosity could be increased using this system. We also discuss experimental tests of the plasma lens concept.
keywords:
Download | Details | Edit | Delete
title: Progress in the Design of a DC FEL Power Source Using a Pelletron Driver
format: conference proceeding
conference: PAC 1987
year: 1987
7 authors: Larson, D. J. | D.B. Cline | S. Anderson | J.B. Rosenzweig | Sundquist, M. L. | Adney, J. R. | Dehais, S. J.
abstract: We discuss progress in the design of a DC Free Electron Laser power source using a Pelletron electrostatic accelerator as a driver. Such a power source should deliver up to 200 kW DC power in wavelengths ranging from a few microns to a few centimeters. The advantages of this system for use as a power source for future acceleration techniques are its efficiency, tunability and high average power. In order to achieve DC operation of the system extremely high electron recovery efficiencies are required. It is also likely that FEL operation will result in a large spread of electron energies. These design constraints require the development of a highly efficient electron beam collector as well as beam optics capable of recirculating beams with a large energy spread. We present collector and beamline designs and include electron optics studies for the full range of operating conditions.
keywords:
Download | Details | Edit | Delete
title: Luminosity enhancement in linear colliders using a short focal length plasma lens
format: conference proceeding
conference: UCLA Workshop on Linear-Collider BB Factory Conceptual Design
year: 1987
4 authors: J.B. Rosenzweig | B. Cole | D. J. Larson | D. B. Cline
abstract: It is likely that powerful new focusing methods will be required for the linear colliders of the future. One scheme that shows much promise is plasma focusing in which a particle bunch traversing a plasma is focused by its own wake-fields. The authors present a review of the theory of self pinching due to plasma wake-fields and extend these previous results by discussing how this effect might be of use in constructing a short focal length plasma lens. They then discuss the general properties of short focal length lenses, and the luminosity enhancement that can be theoretically obtained from them. They also examine some of the practical issues involved in installing a plasma lens in a linear collider. (12 References).
keywords:
Download | Details | Edit | Delete
title: Tunable two frequency free electron laser using a Pelletron as a driver for a plasma beatwave accelerator
format: conference proceeding
conference: FEL 1986 8th
year: 1987
4 authors: D. B. Cline | D. J. Larson | F. E. Mills | J.B. Rosenzweig
abstract: The possibility of amplifying two frequencies simultaneously in a free electron laser is discussed. Stability conditions for electron motion are derived, and numerical calculations reported. The advantages offered by using a DC Pelletron beam to power such a device, with application to the plasma beatwave accelerator-high efficiency, high average power, radiation wavelength tunability, and the possibility of phase locking several independent optical cavities-are evaluated. Related research efforts, and their impact on the design of this device, are discussed. (10 References).
keywords:
Download | Details | Edit | Delete
title: Tunable two frequency free electron laser using a Pelletron as a driver for a plasma beatwave accelerator
format: conference proceeding
conference: High Intensity Laser Processes
year: 1986
4 authors: D.J. Larson | J.B. Rosenzweig | D.B. Cline | F.E. Mills
abstract: The possibility of amplifying two frequencies simultaneously in a free electron laser is discussed. Stability conditions for electron motion are derived, and numerical calculations reported. The advantages offered by using a DC Pelletron beam to power such a device, with application to the plasma beatwave accelerator-high efficiency, high average power, radiation wavelength tunability, and the possibility of phase locking several independent optical cavities-are evaluated. Related research efforts, and their impact on the design of this device are discussed. (10 References).
keywords:
Download | Details | Edit | Delete
title: Plasma wake field acceleration: a proposed experimental test
format: conference proceeding
conference: Workshop on Laser Acceleration of Particles 2nd
year: 1985
9 authors: J.B. Rosenzweig | D. B. Cline | R. N. Dexter | D. J. Larson | A. W. Leonard | K. R. Mengelt | J. C. Sprott | F. E. Mills | F. T. Cole
abstract: The prospect of achieving very high accelerating fields has led to proposals for using electrostatic plasma waves to accelerate charged particles for high energy physics. It has been predicted theoretically that these plasma waves can be driven by the wake fields of short bunches, or trains of bunches, of charged particles, to accelerate a subsequent bunch; the longitudinal electric fields could possibly be of the order of a few GV/m. The authors present an outline of a proposed experimental test of this principle. (14 References).
keywords:
Download | Details | Edit | Delete