PAC07 - List of Authors (Harris, J. R.)

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Harris, J. R.

Paper	Title	Page
WEPMS014	Vacuum Insulator Studies for the Dielectric Wall Accelerator	2358
	J. R. Harris D. T. Blackfield, G. J. Caporaso, Y.-J. Chen, M. Sanders LLNL, Livermore, California M. L. Krogh University of Missouri - Rolla, Rolla, Missouri
	Funding: This work was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48. As part of our ongoing development of the Dielectric Wall Accelerator, we are studying the performance of multilayer high-gradient insulators. These vacuum insulating structures are composed of thin, alternating layers of metal and dielectric, and have been shown to withstand higher gradients than conventional vacuum insulator materials. This paper describes these structures and presents some of our recent results.
THPAS046	Transverse-Longitudinal Coupling in an Intense Electron Beam	3597
	J. R. Harris R. Feldman, P. G. O'Shea UMD, College Park, Maryland
	Funding: This paper was prepared under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48. This paper describes the longitudinal expansion of a 10 keV, 100 mA electron beam in the University of Maryland Electron Ring. The expansion of the beam tail was found to be sensitive to the choice of transverse focusing settings due to the presence of an abnormality in the beam current profile. Expansion of the beam head, where no abnormality was observed, is in good agreement with the one-dimensional cold fluid model.
TUYC02	High Gradient Induction Accelerator	857
	G. J. Caporaso D. T. Blackfield, Y.-J. Chen, J. R. Harris, S. A. Hawkins, L. Holmes, S. D. Nelson, A. Paul, B. R. Poole, M. A. Rhodes, S. Sampayan, M. Sanders, S. Sullivan, L. Wang, J. A. Watson LLNL, Livermore, California M. L. Krogh University of Missouri - Rolla, Rolla, Missouri C. Nunnally University of Missouri, Columbia, Columbia, Missouri K. Selenes TPL, Albuquerque, NM
	Funding: This work was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48. Progress in the development of compact induction accelerators employing advanced vacuum insulators and dielectrics will be described. These machines will have average accelerating gradients at least an order of magnitude higher than existing machines and can be used for a variety of applications including flash x-ray radiography and medical treatments. Research describing an extreme variant of this technology aimed at proton therapy for cancer will be described.
	Slides
TUPAS057	Injector Particle Simulation and Beam Transport in a Compact Linear Proton Accelerator	1781
	D. T. Blackfield Y.-J. Chen, J. R. Harris, S. D. Nelson, A. Paul, B. R. Poole LLNL, Livermore, California
	Funding: This work was performed under the auspices of the U. S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. A compact Dielectric Wall Accelerator (DWA), with field gradient up to 100 MV/m, is being developed to accelerate proton bunches for use in cancer therapy treatment. The injector first generates a few nanosecond long and 40 pQ proton bunch, which is then compressed in the compression section at the end of the injector. Finally the bunch is accelerated in the high-gradient DWA accelerator to energy up to 70 - 250 MeV. The Particle-In-Cell (PIC) code LSP is used to model several aspects of this design. First, we use LSP to determine the needed voltage waveform in the A-K gap that will produce a proton bunch with the requisite charge. We then model pulse compression and shaping in the section between the A-K gap and the DWA. We finally use LSP to model the beam transport through the DWA.