A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Jacquez, E.B.

Paper Title Page
MOP102 Electron Beam Dynamics in the DARHT-II Linear Induction Accelerator 311
  • C. Ekdahl, E.O. Abeyta, P. Aragon, R.D. Archuleta, G.V. Cook, D. Dalmas, K. Esquibel, R.J. Gallegos, R.W. Garnett, J.F. Harrison, E.B. Jacquez, J.B. Johnson, B.T. McCuistian, N. Montoya, S. Nath, K. Nielsen, D. Oro, L.J. Rowton, M. Sanchez, R.D. Scarpetti, M. Schauer, G.J. Seitz, H.V. Smith, R. Temple
    LANL, Los Alamos, New Mexico
  • H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, C.-Y. Tom, C.P. Trainham, J.T. Williams
    NSTec, Los Alamos, New Mexico
  • T.C. Genoni, T.P. Hughes, C.H. Thoma
    Voss Scientific, Albuquerque, New Mexico
  • B.A. Prichard, M.E. Schulze
    SAIC, Los Alamos, New Mexico

Funding: Work supported by USDOE under contract DE-AC52-06NA25396
The DARHT-II linear induction accelerator (LIA) accelerates a 2 kA electron beam to more than 17 MeV. The beam pulse has a greater than 1.5-microsecond flattop region over which the electron kinetic energy is constant to within 1%. The beam dynamics are diagnosed with 21 beam-position monitors located throughout the injector, accelerator, and after the accelerator exit, where we also have beam imaging diagnostics. I will discuss the tuning of the injector and accelerator, and I will present data for the resulting beam dynamics. Beam motion at the accelerator exit is undesirable for its application as a bremsstrahlung source for multi-pulse radiography of explosively driven hydrodynamic experiments. I will discuss the tuning procedures and other methods we use to minimize beam motion, and to suppress the beam-breakup (BBU) and ion-hose instabilities*.

*"Long-pulse beam stability experiments on the DARHT-II linear induction accelerator", Carl Ekdahl, et al., IEEE Trans. Plasma. Sci. Vol. 34, 2006, pp. 460-466.

MOP113 The Dual Axis Radiographic Hydrodynamic Test (DARHT) Facility Personnel Safety System (PSS) Control System 340
  • E.B. Jacquez
    LANL, Los Alamos, New Mexico

Funding: This work supported by the US National Nuclear Security Agency and the US Department of Energy under contract DE-AC52-06NA25396
The mission of the Dual Axis Radiograph Hydrodynamic Test (DARHT) Facility is to conduct experiments on dynamic events of extremely dense materials. The PSS control system is designed specifically to prevent personnel from becoming exposed to radiation and explosive hazards during machine operations and/or the firing site operation. This paper will outline the Radiation Safety System (RSS) and the High Explosive Safety System (HESS) which are computer-controlled sets of positive interlocks, warning devices, and other exclusion mechanisms that together form the PSS.

TUP020 Commissioning the DARHT-II Accelerator Downstream Transport and Target 434
  • M.E. Schulze
    SAIC, Los Alamos, New Mexico
  • E.O. Abeyta, R.D. Archuleta, J. Barraza, D. Dalmas, C. Ekdahl, W.L. Gregory, J.F. Harrison, E.B. Jacquez, J.B. Johnson, P.S. Marroquin, B.T. McCuistian, R.R. Mitchell, N. Montoya, S. Nath, K. Nielsen, R.M. Ortiz, L.J. Rowton, R.D. Scarpetti, M. Schauer, G.J. Seitz
    LANL, Los Alamos, New Mexico
  • R. Anaya, G.J. Caporaso, F.W. Chambers, Y.-J. Chen, S. Falabella, G. Guethlein, B.A. Raymond, R.A. Richardson, J.A. Watson, J.T. Weir
    LLNL, Livermore, California
  • H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, C.-Y. Tom
    NSTec, Los Alamos, New Mexico
  • T.P. Hughes, C.H. Thoma
    Voss Scientific, Albuquerque, New Mexico

The DARHT-II accelerator produced a 2 kA, 17 MeV beam over a 1600 ns flattop. After exiting the accelerator, the long pulse is sliced into four short pulses by a kicker and quadrupole septum and then transported and focused on a target for conversion to bremsstrahlung for radiography. We describe the initial commissioning tests of the kicker, septum, transport, and multi-pulse converter target. The results of beam measurements made during the commissioning of the accelerator downstream transport are described. Beam optics simulations of the commissioning results are described.


slides icon