Towards highest peak intensities for ultra-short MeV-range ion bunches

Busold, S.; Schumacher, Dennis; Brabetz, C.; Jahn, D.; Kroll, Florian; Deppert, O.; Schramm, U.; Cowan, T. E.; Blažević, A.; Bagnoud, V.; Roth, Markus

doi:10.1038/srep12459

Cited by 50 publications

(44 citation statements)

References 30 publications

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“…Intense ion beams from induction accelerators have complementary advantages (e.g., low energy spread, benign radiation environment) vs. beams derived from laser-plasma acceleration [16].…”

Section: Recent Results and Outlookmentioning

confidence: 99%

Short-pulse, compressed ion beams at the Neutralized Drift Compression Experiment

Seidl

Barnard

Davidson

et al. 2016

J. Phys.: Conf. Ser.

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We have commenced experiments with intense short pulses of ion beams on the Neutralized Drift Compression Experiment (NDCX-II) at Lawrence Berkeley National Laboratory, with 1-mm beam spot size within 2.5 ns full-width at half maximum. The ion kinetic energy is 1.2 MeV. To enable the short pulse duration and mm-scale focal spot radius, the beam is neutralized in a 1.5-meter-long drift compression section following the last accelerator cell. A short-focal-length solenoid focuses the beam in the presence of the volumetric plasma that is near the target. In the accelerator, the line-charge density increases due to the velocity ramp imparted on the beam bunch. The scientific topics to be explored are warm dense matter, the dynamics of radiation damage in materials, and intense beam and beam-plasma physics including select topics of relevance to the development of heavy-ion drivers for inertial fusion energy. Below the transition to melting, the short beam pulses offer an opportunity to study the multi-scale dynamics of radiation-induced damage in materials with pump-probe experiments, and to stabilize novel metastable phases of materials when short-pulse heating is followed by rapid quenching. First experiments used a lithium ion source; a new plasma-based helium ion source shows much greater charge delivered to the target.

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“…Intense ion beams from induction accelerators have complementary advantages (e.g., low energy spread, benign radiation environment) vs. beams derived from laser-plasma acceleration [16].…”

Section: Recent Results and Outlookmentioning

confidence: 99%

Short-pulse, compressed ion beams at the Neutralized Drift Compression Experiment

Seidl

Barnard

Davidson

et al. 2016

J. Phys.: Conf. Ser.

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show abstract

“…Ion pulses are initially not much longer than the driving laser pulse, 23 but ion pulse de-bunches quickly due to large ion energy distributions and sub-ns pulse durations can be restored by re-bunching. 24 Because the ion energies are higher in Bella-i and ion ranges increase in proportion to the increased ion energy, the expected temperatures are only modestly higher, but the decreased pulse duration (with compression) will allow an order of magnitude higher cooling rate, and exploration of lattice relaxation on the 10-100 ps time scale. Considerably higher lattice temperatures than for proton pulses are obtainable using higher mass ions such as carbon.…”

Section: Discussionmentioning

confidence: 99%

Modeling of intense pulsed ion beam heated masked targets for extreme materials characterization

Barnard

Schenkel

2017

Journal of Applied Physics

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Intense, pulsed ion beams locally heat materials and deliver dense electronic excitations that can induce material modifications and phase transitions. Material properties can potentially be stabilized by rapid quenching. Pulsed ion beams with pulse lengths of order ns have recently become available for materials processing. Here, we optimize mask geometries for local modification of materials by intense ion pulses. The goal is to rapidly excite targets volumetrically to the point where a phase transition or local lattice reconstruction is induced followed by rapid cooling that stabilizes desired material's properties fast enough before the target is altered or damaged by, e.g., hydrodynamic expansion. By using a mask, the longitudinal dimension can be large compared to the transverse dimension, allowing the possibility of rapid transverse cooling. We performed HYDRA simulations that calculate peak temperatures for a series of excitation conditions and cooling rates of silicon targets with micro-structured masks and compare these to a simple analytical model. The model gives scaling laws that can guide the design of targets over a wide range of pulsed ion beam parameters.

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“…In this chamber, diagnostics and the imaging arXiv:1802.00740v1 [physics.acc-ph] 30 Jan 2018 target are positioned. This beamline design yields proton bunches with more than 10 8 particles per bunch which can be energy-compressed or time-compressed into the subnanosecond regime, reported by S. Busold et al 12 . These particular properties of the generated LIGHT proton beams (high brightness, energy-compressed or timecompressed bunch) make them interesting for a variety of possible applications, especially imaging techniques.…”

Section: Introductionmentioning

confidence: 87%

First application studies at the laser-driven LIGHT beamline: Improving proton beam homogeneity and imaging of a solid target

Jahn¹,

Schumacher²,

Brabetz³

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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In the last two decades, the generation of intense ion beams based on laser-driven sources has become an extensively investigated field. The LIGHT collaboration combines a laserdriven intense ion source with conventional accelerator technology based on the expertise of laser, plasma and accelerator physicists. Our collaboration has installed a laser-driven multi-MeV ion beamline at the GSI Helmholtzzentrum für Schwerionenforschung delivering intense proton bunches in the subnanosecond regime. We investigate possible applications for this beamline, especially in this report we focus on the imaging capabilities. We report on our proton beam homogenization and on first imaging results of a solid target.

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Towards highest peak intensities for ultra-short MeV-range ion bunches

Cited by 50 publications

References 30 publications

Short-pulse, compressed ion beams at the Neutralized Drift Compression Experiment

Short-pulse, compressed ion beams at the Neutralized Drift Compression Experiment

Modeling of intense pulsed ion beam heated masked targets for extreme materials characterization

First application studies at the laser-driven LIGHT beamline: Improving proton beam homogeneity and imaging of a solid target

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