PAC2013 - List of Authors (Sullivan, G.)

Paper	Title	Page
TUPAC17	Limitations of Increasing the Intensity of a Relativistic Electron Beam	484
	J.E. Coleman, M.T. Crawford, C. Ekdahl, B.T. McCuistian, D.C. Moir, G. Sullivan LANL, Los Alamos, New Mexico, USA
	Funding: This work was supported by the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. A 7 cm cathode has been deployed for use on a 3.8 MV, 80 ns blumlein, to increase the current from the nominal 1.7 kA to 2.9 kA. The intense relativistic electron bunch is accelerated and transported through a nested solenoid and ferrite induction core lattice consisting of 64 elements, exiting the accelerator with a nominal energy of 19.8 MeV. The principal objective of these experiments is to quantify the space charge limitations on the beam quality, in addition to its coupling with the corkscrew and the beam break-up (BBU) instabilities. Time resolved centroid measurements indicate a reduction in BBU >5x with simply a 20% increase in the average B-field used to transport the beam though the accelerator. A qualitative comparison of experimental and calculated results are presented, which include time resolved current density distributions, axial beam centroid oscillations, and corkscrew and BBU amplitude with different accelerator lattice tunes.

Paper

Title

Page

Limitations of Increasing the Intensity of a Relativistic Electron Beam

484

J.E. Coleman, M.T. Crawford, C. Ekdahl, B.T. McCuistian, D.C. Moir, G. Sullivan
LANL, Los Alamos, New Mexico, USA

Funding: This work was supported by the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396.
A 7 cm cathode has been deployed for use on a 3.8 MV, 80 ns blumlein, to increase the current from the nominal 1.7 kA to 2.9 kA. The intense relativistic electron bunch is accelerated and transported through a nested solenoid and ferrite induction core lattice consisting of 64 elements, exiting the accelerator with a nominal energy of 19.8 MeV. The principal objective of these experiments is to quantify the space charge limitations on the beam quality, in addition to its coupling with the corkscrew and the beam break-up (BBU) instabilities. Time resolved centroid measurements indicate a reduction in BBU >5x with simply a 20% increase in the average B-field used to transport the beam though the accelerator. A qualitative comparison of experimental and calculated results are presented, which include time resolved current density distributions, axial beam centroid oscillations, and corkscrew and BBU amplitude with different accelerator lattice tunes.