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AAC 1992 3rd

Name: AAC 1992 3rd

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Date: 1992-01-01

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Created at: Fri Jul 27 23:53:36 -0700 2007

Updated at: Fri Jul 27 23:53:36 -0700 2007

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6 papers from the conference:

title: Use of an inverse free electron laser in a linear collider B factory
format: conference proceeding
conference: AAC 1992 3rd
year: 1993
3 authors: C. Pellegrini | J. Sandweiss | N. Barov
abstract: The authors examine the possibility of using an IFEL as an accelerator in a linear collider B Factory. An IFEL is able to utilize a sizeable fraction of the energy of the laser pulse used to accelerate the beams. It is also able to meet the stringent requirements imposed on the energy spread and luminosity at the interaction point. Two separate examples are considered, differing in the way the laser pulse energy is coupled to the electron beam. The first maximizes the slippage between the beam bunch and the radiation, in order to decrease the peak laser power. In the second example the slippage is minimized. This results in uniform beam loading and may in principle be run at higher efficiency and lower average power. The authors also address the laser required to drive this accelerator. The power and frequency requirements suggest the use of a FEL drive laser. The design for this system includes the use of superconducting cavities to accelerate the drive beam, which is then propagated through an initially constant period undulator that is tapered after saturation.
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title: Photoelectron beams from the UCLA RF gun
format: conference proceeding
conference: AAC 1992 3rd
year: 1993
12 authors: S. Park | N. Barov | S. Hartman | C. Pellegrini | J.B. Rosenzweig | P. Tran | G. Travish | R. Zhang | P. Davis | G. Hairapetian | C. Joshi | N. Luhmann
abstract: A high brightness, low emittance photocathode rf gun is starting operation at UCLA as an injector to a 20 MeV linac. This linac will initially be used to drive FELs, plasma wakefield accelerators, and to test plasma lenses. The gun is a 1 1/2 cell pi-mode standing wave structure running at 2.856 GHz, and has a copper photocathode. In the initial commissioning of the gun, photoelectron beams of up to 2.5 nC at 4.5 MeV have been produced. We report on the current status of the system, experimental data taken with 50 ps UV laser pulses, and plans for the future.
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title: Report of the Working Group on Near-field accelerators
format: conference proceeding
conference: AAC 1992 3rd
year: 1993
1 author: J.B. Rosenzweig
abstract: Advanced research on near-field acceleration, by the time of this meeting, has progressed into mature field of both experimental and theoretical investigation. This field has a number of subcomponents; a few of the more notable are wake-field acceleration, open structure laser acceleration, and novel RF structures. This paper will provide an overview of these subjects, and examine the most recent advances in near-field acceleration and the facilities developed for its study, as reported at the Port Jefferson workshop. (17 References).
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title: Asymmetric emittance RF photocathode source for linear collider applications
format: conference proceeding
conference: AAC 1992 3rd
year: 1993
2 authors: J.B. Rosenzweig | Smolin, J. A.
abstract: Laser driven RF photocathodes represent a recent advance in high-brightness electron beam sources. The authors investigate here a variation on these devices, that obtained by using a ribbon laser pulse to illuminate the cathode, yielding a flat beam (sigma_x >> sigma_y) which has asymmetric emittances at the cathode proportional to the beam size each transverse dimension. The flat-beam geometry mitigates space charge forces which lead to intensity dependent transverse and longitudinal emittance growth, thus limiting the beam brightness. The fundamental limit on achievable emittance and brightness is set by the transverse momentum distribution and peak current density of the photo-electrons (photon energy and cathode material dependent effects) and appears to allow, taking into account space charge and RF effects, normalized emittances epsilon_x <1x10(-4) m-rad and epsilon_y < 10(-6) m-rad, with Q = 5 nC and sigma_z = 1 mm. These source emittances are adequate for superconducting linear collider applications, and could preclude the use of a damping ring for the electrons in these schemes.
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title: Strong sextupole focusing for planar undulators
format: conference proceeding
conference: AAC 1992 3rd
year: 1993
2 authors: G. Travish | J.B. Rosenzweig
abstract: The range of parameters in which the free electron laser (FEL) is used has greatly expanded in recent years. The present trend towards short wavelength operations with long undulators places tight requirements on the electron beam quality. In particular, the need to maintain a well focused beam is critical to successful operation of such an FEL. This paper examines the use of alternating gradient (AG) sextupole focusing in planar undulators. After a brief review of various undulator focusing schemes, the equations of motion for an electron in an undulator field with a strong sextupole component are examined. It is shown that the mean electron longitudinal velocity can be kept constant through each focusing and defocusing section. Thus, the betatron velocity modulation associated with transverse focusing can be limited. Analytic as well as smooth approximation solutions are provided for AG sextupole focusing. Examples using the proposed SLAC 4 nm FEL as well as the UCLA 10.6 um FEL parameters are also discussed.
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title: Strong Focusing for Planar Undulators
format: conference proceeding
conference: AAC 1992 3rd
year: 1992
2 authors: G. Travish | J.B. Rosenzweig
abstract: The range of parameters in which the free electron laser (FEL) is used has greatly expanded in recent years. The present trend towards short wavelength operation with long undulators places tight requirements on the electron beam quality. In particular, the need to maintain a well focused beam is critical to successful operation of such an FEL. This paper examines the use of alternating gradient (AG) sextupole focusing in planar undulators. After a brief review of various undulator focusing schemes, the equations of motion for an electron in an undulator field with a strong sextupole component are examined. It is shown that the mean electron longitudinal velocity can be kept constant through each fosusing and defocusing section. Thus, the betatron velocity modulation associated with transverse focusing can be limited. Analytic as well as smooth approximation solutions are provided for AG sextupole focusing. Examples using the proposed SLAC 4 nm FEL as well as th UCLA 10.6 �m FEL parameters are also discussed.
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