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PAC 1989

Name: PAC 1989

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Date: 1989-01-01

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Created at: Fri Jul 27 23:53:34 -0700 2007

Updated at: Fri Jul 27 23:53:34 -0700 2007

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5 papers from the conference:

title: Experimental Measurement of Nonlinear Plasma Wake-Fields
format: conference proceeding
conference: PAC 1989
year: 1989
7 authors: J.B. Rosenzweig | Schoessow, P. | Cole, B. | W. Gai | Konecny, R. | Norem, J. | J. Simpson
abstract: We report direct high resolution observation of nonlinear steepened plasma waves excited in the wake of an intense, self-pinched electron beam. Oscillations in both accelerating and deflecting fields are measured, and analyzed in the context of linear and nonlinear plasma wave theory. The degree of nonlinearity in the wake-fields is shown to be consistent with analytical predictions of the beam self-pinching. The impact of these results on plasma acceleration and focusing schrmrs is discussed.
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title: Operational status of the Brookhaven National Laboratory Accelerator Test Facility
format: conference proceeding
conference: PAC 1989
year: 1989
18 authors: Batchelor, K. | Ben-Zvi, I. | Biglio, I. | Chou, T. S. | R. Fernow | Fischer, J. | J. Gallardo | H. G. Kirk | Kurnit, N. | McDonald, K. T. | Palmer, R. B. | Parsa, Z. | C. Pellegrini | Sheehan, J. | Srinivasan-Rao, T. | Ulc, S. | M. Woodle | van Steenbergen, A.
abstract: The design and operation of a 50-MeV electron linear accelerator utilizing a low emittance ( gamma epsilon =5 to 10 mm-mrad) radio-frequency gun operating at an output energy of 5 MeV and a charge of 1 nC are described. Design calculations, early radio-frequency measurements, and operational experience with the electron gun utilizing a dummy cathode in place of the proposed photocathode emitter are given. The dynamics of the electron beam coming off the photocathode has been modeled with the programs PARMELA and MASK. General agreement as to the expected characteristics of the electron beam at the RF-gun exit has been obtained using the two programs. It was also verified that, with proper matching of the transverse beam, no increase of the transverse normalized emittance occurs at the linac due to the fundamental RF mode. (5 References).
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title: Beam break-up in the two-beam accelerator
format: conference proceeding
conference: PAC 1989
year: 1989
5 authors: D. H. Whittum | G. Travish | Sessler, A. M. | G. D. Craig | J. F. DeFord
abstract: Beam breakup (BBU) in the drive beam of a two-beam accelerator (TBA) using transverse wakes calculated by the AMOS code was studied numerically. Only cumulative BBU due to the wake of the linear induction accelerator cavities is considered. Growth lengths on the order of approximately 100 m are found for typical parameters. It is concluded that these growth lengths are acceptable for a future TBA. (14 References).
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title: Report on the Lake Arrowhead workshop on advanced acceleration concepts
format: conference proceeding
conference: PAC 1989
year: 1989
1 author: C. Pellegrini
abstract: The author reviews the present status of the field of new acceleration concepts, as presented at the Lake Arrowhead workshop, held at the beginning of 1989. It is pointed out that the field of advanced accelerator concepts has seen a remarkable progress during the last few years. Plasma and wakefield acceleration has been demonstrated. One can foresee similar progress in the area of laser acceleration when the Brookhaven ATF starts operation. Ideas for using plasmas to focus particle beams and to produce beam neutralization at the interaction point of a collider have also been developed. It is further noted that the development of high-brightness beams and high-gradient linacs can also have, in the near future, a strong impact on other fields, such as FELs (free-electron lasers) and synchrotron radiation sources. (43 References).
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title: The Brookhaven Accelerator Test Facility injection system
format: conference proceeding
conference: PAC 1989
year: 1989
5 authors: X.J. Wang | H. G. Kirk | C. Pellegrini | McDonald, K. T. | Russell, D. P.
abstract: The Brookhaven Accelerator Test Facility (ATF) consists of a 50-MeV/c electron linac and a high-brightness RF gun, both operating at 2856 MHz. An extremely short (a few picoseconds) electron pulse with a low transverse emittance is generated by the RF gun. In order to preserve both longitudinal and transverse emittances, great care must be taken in transporting the electron beam from the RF gun to the linac. The injection line is described, first- and second-order lattice studies of the injection line are presented, and nonlinear effects on the emittance are studied. It is shown that it is possible to preserve transverse emittance in a low-energy beam-transfer line by use of slits and contoured edges of the dipole magnets. Bunch lengthening is induced by the large beam divergence out of the RF gun, thus requiring strong focusing. (11 References).
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