HIF research on the University of Maryland Electron Ring (UMER)

Kishek, R. A.; Bernal, S.; Cui, Yaodong; Godlove, Terry F.; Haber, I.; Harris, John R.; Huo, Yijie; Li, H.; O'Shea, P.G.; Quinn, B.; Reiser, M.; Walter, M.; Wilson, Mark A.; Zou, Y.

doi:10.1016/j.nima.2005.01.235

Cited by 16 publications

(7 citation statements)

References 21 publications

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“…Long-path-transport physics experiments have begun with the University of Maryland Electron Ring [12], and with the Paul Trap Simulator Experiment at PPPL [13]. These novel experiments allow the study of relevant driver beam dynamics over 100's to 1000's of lattice periods at modest cost.…”

Section: Scaled Long-path Experimentsmentioning

confidence: 99%

Overview of US heavy ion fusion research

et al. 2005

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Significant experimental and theoretical progress has been made in the U.S. heavy ion fusion program on high-current sources, injectors, transport, final focusing, chambers and targets for high energy density physics (HEDP) and inertial fusion energy (IFE) driven by induction linac accelerators. One focus of present research is the beam physics associated with quadrupole focusing of intense, space-charge dominated heavy-ion beams, including gas and electron cloud effects at high currents, and the study of long-distance-propagation effects such as emittance growth due to field errors in scaled experiments. A second area of emphasis in present research is the introduction of background plasma to neutralize the space charge of intense heavy ion beams and assist in focusing the beams to a small spot size. In the near future, research will continue in the above areas, and a new area of emphasis will be to explore the physics of neutralized beam compression and focusing to high intensities required to heat targets to high energy density conditions as well as for inertial fusion energy. IF/1-2 2 I. IntroductionA coordinated beam physics program by the Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and Princeton Plasma Physics Laboratory (the Heavy-Ion Fusion Virtual National Laboratory), together with collaborators at Mission Research Corporation, Sandia National Laboratories, and the University of Maryland, pursues intense space-charge-dominated beam science in support of applications of heavy-ion beams to high energy density physics and to inertial fusion energy. A unifying research theme for the US program is to address a key scientific question of fundamental importance to both high energy density physics and inertial fusion energy-"How can heavy ion beams be compressed to the high intensities required for creating high energy density matter and fusion ignition conditions". The primary scientific challenge is to compress intense ion beams in time and space sufficiently to heat targets to the desired temperatures with pulse durations of order or less than the target hydrodynamic expansion time. Present experiments, theory and simulations investigate key technical issues that can affect the brightness (focusability) of space-charge dominated beams, including the effects of gas and electron cloud interactions, as well as emittance growth during focusing of such intense beams, including the effects of neutralizing background plasma. Section II describes selected highlights of recent research since the 2002 IAEA Fusion Energy Conference. In particular, recent particle-in-cell simulations of planned near-term experiments of modest scale indicate that intense heavy ion beams injected with an appropriate head-to-tail velocity gradient ("tilt") into a long neutralizing background plasma column may be compressed by more than a factor of 100 in length and focused by a factor greater than 20 in radius (> 40,000 increase in intensity). Section III describes newly developed research plans ...

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Section: Scaled Long-path Experimentsmentioning

confidence: 99%

Overview of US heavy ion fusion research

et al. 2005

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“…However, a grid also causes effects which impose limitations on machine performance. These include transverse variation in the emitted current, disruption to the beam's distribution in phase space [2], emittance growth [3], and potential beam loss at high current.…”

Section: Introductionmentioning

confidence: 99%

Theory and simulation of backbombardment in single-cell thermionic-cathode electron guns

Edelen

Biedron

Harris

et al. 2015

Phys. Rev. ST Accel. Beams

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This paper presents a comparison between simulation results and a first principles analytical model of electron back-bombardment developed at Colorado State University for single-cell, thermionic-cathode rf guns. While most previous work on back-bombardment has been specific to particular accelerator systems, this work is generalized to a wide variety of guns within the applicable parameter space. The merits and limits of the analytic model will be discussed. This paper identifies the three fundamental parameters that drive the back-bombardment process, and demonstrates relative accuracy in calculating the predicted back-bombardment power of a single-cell thermionic gun.

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“…The basic motivation behind University of Maryland Electron Ring (UMER) [1,2,3,4] is to study space-charge phenomena of intense beams. The University of Maryland Electron Ring (UMER) is a scaled model to investigate the physics of intense beams.…”

Section: Introductionmentioning

confidence: 99%

Beam Injection and Matching Studies at the University of Maryland Electron Ring (UMER)

Thangaraj¹,

Kishek²,

Bernal³

et al. 2006

AIP Conference Proceedings

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The University of Maryland Electron Ring (UMER) is a scaled model to investigate the physics of such intense beams. It uses a 10-keV electron beam along with other scaled beam parameters that model the larger machines but at a lower cost. Recently, multi turn operation of the ring (3.6 m diameter) has been achieved. In order to have full current transport of the electron beam, and to increase the number of turns of the beam around the ring, injection of the beam from the straight section into the ring becomes crucial. In this work, we report experimental results from the injection and matching of a space charge dominated beam and an emittance dominated beam. We also describe and analyze two methods of injection of the electron beam from the straight section into the ring. In one of the methods, the two injection quads are fixed to a preset value, while in the other both the injection quads are switched off (Collins injection).

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HIF research on the University of Maryland Electron Ring (UMER)

Cited by 16 publications

References 21 publications

Overview of US heavy ion fusion research

Overview of US heavy ion fusion research

Theory and simulation of backbombardment in single-cell thermionic-cathode electron guns

Beam Injection and Matching Studies at the University of Maryland Electron Ring (UMER)

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