Plans for longitudinal and transverse neutralized beam compression experiments, and initial results from solenoid transport experiments

Seidl, P.A.; Armijo, Julien; Bača, D.; Bieniosek, F.M.; Coleman, J. E.; Davidson, Ronald C.; Efthimion, P. C.; Friedman, A.; Gilson, Erik; Grote, D.P.; Haber, I.; Henestroza, E.; Kaganovich, Igor; Leitner, M.; Logan, B.G.; Molvik, A.W.; Rose, D. V.; Roy, P.K.; Sefkow, A. B.; Sharp, W.M.; Vay, Jean‐Luc; Waldron, W.L.; Welch, D. R.; Yu, S.S.

doi:10.1016/j.nima.2007.02.055

Cited by 25 publications

(13 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For WDM studies, which need shorter pulses, the beam must be neutralized during compression; this may prove advantageous for IFE as well. In recent experiments [5,6] on the NDCX facility at LBNL, a carefully developed tilt waveform yielded sixty-fold longitudinal compression. Figure 1 shows the evolution of the longitudinal compression factor, as measured using the fast Faraday cup [7] and as simulated using the LSP code, a kinetic model, and a hybrid model [8].…”

Section: Hifs-vnl Beam Experiments a Neutralized Compression Andmentioning

confidence: 99%

Overview of theory and simulations in the Heavy Ion Fusion Science Virtual National Laboratory

Friedman

2007

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

The Heavy Ion Fusion Science Virtual National Laboratory (HIFS-VNL) is a collaboration of Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and Princeton Plasma Physics Laboratory. These laboratories, in cooperation with researchers at other institutions, are carrying out a coordinated effort to apply intense ion beams as drivers for studies of the physics of matter at extreme conditions, and ultimately for inertial fusion energy. Progress on this endeavor depends upon coordinated application of experiments, theory, and simulations. This paper describes the state of the art, with an emphasis on the coordination of modeling and experiment; developments in the simulation tools, and in the methods that underly them, are also treated.

show abstract

Section: Hifs-vnl Beam Experiments a Neutralized Compression Andmentioning

confidence: 99%

Overview of theory and simulations in the Heavy Ion Fusion Science Virtual National Laboratory

Friedman

2007

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…This energy is slightly below the 1.9 MeV Bragg peak, which is the required energy to optimize uniform heating through electronic stopping power at the center of the $m-thick Al target heated by a Li þ ion driver [7][8][9][10]. The neutralized drift compression experiment (NDCX) at LBNL is exploring the physical limits of compression and focusing of ion beams and conducting preliminary WDM experiments [11][12][13][14][15]. In preparation for NDCX-II, the longitudinal phase space and temperature measurements described herein were used to quantitatively understand the requirements for the acceleration diode, acceleration schedule, and velocity tilt.…”

Section: Introductionmentioning

confidence: 99%

Single-pulse and multipulse longitudinal phase space and temperature measurements of an intense ion beam

Coleman

Seidl

Bieniosek

et al. 2012

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

Longitudinal phase space and temperature measurements were conducted on a 2-3 s long, singly charged K þ ion bunch with an ion energy of $0:3 MeV and current of 30 mA. The principal objective of these experiments was to measure the longitudinal beam dynamics and study the limits of axial compression. The differences between the measured beam energy, longitudinal beam dynamics, and the amplitude and time history of the Marx voltage waveform were all quantified. Longitudinal phase space measurements indicate a slight chromaticity ( < 1%) in the beam from head to tail. Record low longitudinal temperatures of T z ¼ 2-4 Â 10 À2 eV were measured for a beam bunch of this intensity with negligible effects from neutralizing the beam space charge with a background plasma. A qualitative comparison of experimental and calculated results are presented, which include time resolved longitudinal distributions, and phase space of the beam at 430 cm.

show abstract

“…Results obtained at the Neutralized Drift Compression Experiment (NDCX) showed 60-fold longitudinal compression of a 300 keV K + beam [2][3]. The next generation accelerator experiment, NDCX-II [4], currently under construction at Berkeley Lab, requires improved neutralization for higher beam currents.…”

Section: Introductionmentioning

confidence: 99%

A seemingly simple task: Filling a solenoid volume in vacuum with dense plasma

et al. 2010

View full text Add to dashboard Cite

Abstract-Space-charge neutralization of a pulsed, high-current ion beam is required to compress and focus the beam on a target for warm dense matter physics or heavy ion fusion experiments. We described attempts to produce dense plasma in and near the final focusing solenoid through which the ion beam travels, thereby providing an opportunity for the beam to acquire the necessary charge-compensating electrons. Among the options are plasma injection from four pulsed vacuum arc sources located outside the solenoid, and using a high current (> 4 kA) pulsed vacuum arc plasma from a ring cathode near the edge of the solenoid. The plasma distribution is characterized by photographic means and by an array of movable Langmuir probes. The plasma is produced at several cathode spots distributed azimuthally on the ring cathode.Beam neutralization and compression are accomplished, though issues of density, uniformity, and pulse-to-pulse reproducibly remain to be solved.

show abstract

Plans for longitudinal and transverse neutralized beam compression experiments, and initial results from solenoid transport experiments

Cited by 25 publications

References 17 publications

Overview of theory and simulations in the Heavy Ion Fusion Science Virtual National Laboratory

Overview of theory and simulations in the Heavy Ion Fusion Science Virtual National Laboratory

Single-pulse and multipulse longitudinal phase space and temperature measurements of an intense ion beam

A seemingly simple task: Filling a solenoid volume in vacuum with dense plasma

Contact Info

Product

Resources

About