PAC 2005 - List of Authors

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

Shuman, D.

Paper	Title	Page
MPPT067	Stray Field Reduction in ALS Eddy Current Septum Magnets	3718
	D. Shuman, W. Barry, S. Prestemon, R.D. Schlueter, C. Steier, G.D. Stover LBNL, Berkeley, California
	Funding: This work was supported by the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. Stray field from an eddy current septum magnet adversely affects the circulating beam and can be reduced using several techniques. The stray field time history typically has a fast rise section followed by a long exponential decay section when pulsed with a half sine drive current. Changing the drive current pulse to a full sine has the effect of both reducing peak stray field magnitude by ~3x, and producing a quick decay from this peak to a lower field level which then has a similar long decay time constant as that from the half sine only drive current pulse. A method for tuning the second half sine (reverse) drive current pulse to eliminate the long exponential decay section is given.
MPPT068	A Compact High Gradient Pulsed Magnetic Quadrupole	3771
	D. Shuman, A. Faltens, G. Ritchie, P.A. Seidl LBNL, Berkeley, California M. Kireeff Covo LLNL, Livermore, California
	Funding: This work was supported by the Director, Office of Science, Office of Fusion Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. A design for a high gradient, low inductance pulsed quadrupole magnet is presented. The magnet is a circular current dominated design with a circular iron return yoke. Features include a five turn eddy current compensated solid conductor coil design which theoretically eliminates the first four higher order multipole field components, a single layer "non-spiral bedstead" coil design which both minimizes utilization of radial space and maximizes utilization of axial space, and allows incorporation of steering and correction coils within existing radial space. The coils are wound and stretched straight in a special winder, then bent in simple fixtures to form the upturned ends, simplifying fabrication and assembly.
MPPT069	A Pulsed Solenoid for Intense Ion Beam Transport	3798
	D. Shuman, E. Henestroza, G. Ritchie, D.L. Vanecek, W. Waldron, S. Yu LBNL, Berkeley, California
	Funding: This work was supported by the Director, Office of Science, Office of Fusion Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. A design for a pulsed solenoid magnet is presented. Some simple design formulas are given that are useful for initial design scoping. Design features to simplify fabrication and improve reliability are presented. Fabrication, assembly, and test results are presented.
RPAE067	Investigations, Experiments, and Implications for Using Existing Pulse Magnets for 'topoff' Operation at the Advanced Light Source	3727
	G.D. Stover, K.M. Baptiste, W. Barry, J. Gath, J. Julian, S. Kwiatkowski, S. Prestemon, R.D. Schlueter, D. Shuman, C. Steier LBNL, Berkeley, California
	Funding: This work was supported by the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. ALS top-off mode of operation will require injection of the electron beam from the Booster Ring into the Storage Ring at the full ALS energy level of 1.9GeV. Currently the Booster delivers a beam at 1.5GeV to the Storage Ring where it is then ramped to the full energy and stored for the user operation. The higher Booster beam energy will require the pulse magnets in the Booster and Storage Rings to operate at proportionally higher magnetic gap fields. Our group studied and tested the possible design and installation modifications required to operate the magnets and drivers at "top-off" levels. Our results and experiments show that with minor electrical modifications all the existing pulse magnet systems can be used at the higher energy levels, and the increased operational stresses should have a negligible impact on magnet reliability. Furthermore, simple electrical modifications to the storage ring thick septum will greatly reduce the present level of septum stray leakage fields into the storage ring beam.
FPAE071	Initial Results on Neutralized Drift Compression Experiments (NDCX-IA) for High Intensity Ion Beam	3856
	P.K. Roy, A. Anders, D. Baca, F.M. Bieniosek, J.E. Coleman, S. Eylon, W.G. Greenway, E. Henestroza, M. Leitner, B. G. Logan, D. Shuman, D.L. Vanecek, W. Waldron, S. Yu LBNL, Berkeley, California R.C. Davidson, P. Efthimion, E.P. Gilson, I. Kaganovich, A.B. Sefkow PPPL, Princeton, New Jersey D. Rose, C.H. Thoma, D.R. Welch ATK-MR, Albuquerque, New Mexico W.M. Sharp LLNL, Livermore, California
	Funding: This work was supported by the Director, Office of Science, Office of Fusion Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. Ion beam neutralization and compression experiments are designed to determine the feasibility of using compressed high intensity ion beams for high energy density physics (HEDP) experiments and for inertial fusion power. To quantitatively ascertain the various mechanisms and methods for beam compression, the Neutralized Drift Compression Experiment (NDCX) facility is being constructed at Lawrence Berkeley National Laboratory (LBNL). In the first compression experiment, a 260 KeV, 25 mA, K+ ion beam of centimeters size is radially compressed to a mm size spot by neutralization in a meter-long plasma column and beam peak current is longitudinally compressed by an induction velocity tilt core. Instrumentation, preliminary results of the experiments, and practical limits of compression are presented. These include parameters such as emittance, degree of neutralization, velocity tilt time profile, and accuracy of measurements (fast and spatially high resolution diagnostic) are discussed.