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Laser-plasma ion beam booster based on hollow-channel magnetic vortex acceleration

Physical Review Research 2024年第3期6卷 033148-033148页

作者： Marco Garten Stepan S. Bulanov Sahel Hakimi Lieselotte Obst-Huebl Chad E. Mitchell Carl B. Schroeder Eric Esarey Cameron G. R. Geddes Jean-Luc Vay Axel Huebl Accelerator Technology & Applied Physics Division Lawrence Berkeley National Laboratory

Laser-driven ion acceleration provides ultrashort, high-charge, low-emittance beams, which are desirable for a wide range of high-impact applications. Yet after decades of research, a significant increase in maximum ion energy is still needed. This paper introduces a quality-preserving staging concept for ultraintense ion bunches that is seamlessly applicable from the nonrelativistic plasma source to the relativistic regime. Full three-dimensional particle-in-cell simulations prove robustness and capture of a high-charge proton bunch, suitable for readily available and near-term laser facilities.

关键词： Advanced accelerator test facilities Electromagnetic field calculations High intensity laser-plasma interactions Laser driven ion acceleration Laser-plasma interactions Particle acceleration in plasmas Plasma acceleration & new acceleration techniques Plasma optics Ponderomotive effects Relativistic multiple-particle dynamics accelerator applications accelerator subsystems Near-critical & underdense plasmas Proton & ion sources Relativistic plasmas Targets Femtosecond laser irradiation First-principles calculations in plasma physics Particle-in-cell methods Plasma kinetic theory

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Producing circular field harmonics inside elliptic magnet apertures with superconducting canted-cosine-theta coils

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Physical Review accelerators and Beams 2024年第2期27卷 022402-022402页

作者： L. Brouwer Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Superconducting magnets with noncircular aperture are desired for accelerators and many other high-field applications. This paper presents new methods for the analytic design of elliptic bore superconducting accelerator magnets. Part 1 of this work shares the derivation of current to field relations between a sheet current density on an elliptic cylinder and the magnetic field harmonics inside the aperture. This result is explored in the general context of elliptic bore magnet design with relevant scaling laws compared between elliptic and circular bore magnets. In part 2, this approach is applied to the specific geometry of canted-cosine-theta (CCT) accelerator magnets, enabling analytic winding design for single or mixed circular harmonics within elliptic aperture CCT magnets.

关键词： Electromagnetic field calculations Methods in electromagnetism Superconducting magnet calculations

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Piezoelectric Transformer using bulk PZT & Fused Quartz for RF Ion accelerators

Piezoelectric Transformer using bulk PZT & Fused Quartz for ...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Garud, Meera Hou, Yuetao Ji, Qing Schenkel, Thomas Afridi, Khurram Khan Lal, Amit Cornell University Electrical and Computer Engineering IthacaNY United States Lawrence Berkeley National Laboratory Accelerator Technology and Applied Physics Division BerkeleyCA United States

ISBN: (纸本)9798350346459

In order to miniaturize ion accelerators for MeV-class ions suitable for fusion or ion implantation, high RF voltages of 1-5 kV at RF frequencies of 10-15 MHz are required. In this paper, we present a piezoelectric transformer (PT) design that can be integrated into PCBs that can be assembled into ion accelerator assemblies. The PT designs utilize vibrational mode shapes and multilayer piezoelectric plate stacking, with the secondary side plates further segmented, connected in series to develop higher voltages into a capacitive load of the ion to fabricate the transformers, making them compatible with PCB accelerators. PZT-841 plates were used as piezoelectric material, and a high-Q fused quartz plates served as an electrical insulator while mechanically coupling mechanical motion between the primary and secondary PZT plates. An open-circuit voltage gain of 5.2 at 7.9 MHz was achieved from a prototype with a planar form factor of 0.9 mm and an area of 6x5 mm2 © 2023 IEEE.

关键词： Ions

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Ultra-Broadband Spectral Combination of Fiber Lasers with Synthesized Pulse Shaping to Reach Short Pulse Lengths for Plasma accelerators 20

Ultra-Broadband Spectral Combination of Fiber Lasers with Sy...

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20th IEEE Advanced accelerator Concepts Workshop, AAC 2022

作者： Chen, Siyun Zhou, Tong Du, Qiang Wang, Dan Vay, Jean-Luc Li, Derun Van Tilborg, Jeroen Schroeder, Carl Esarey, Eric Wilcox, Russell Geddes, Cameron Lawrence Berkeley National Laboratory Accelerator Technology and Applied Physics Division Berkeley United States Lawrence Berkeley National Laboratory Engineering Division Berkeley United States

ISBN: (纸本)9798350333411

We propose ultra-broadband spectral combining of fiber lasers to reach tens-of-fs pulse lengths using coherently-spectrally synthesized pulse shaping. We demonstrated a 54-fs, two-channel spectrally-combined fiber laser system, with two pulse shapers operating at different but partially-overlapped spectrum in each channel to control the spectral intensity and phase. To the best of our knowledge, 54fs is the shortest pulse length from a spectrally combined fiber system at one-micron wavelength, and we achieved the first demonstration of coherent spectral synthesis of pulse shapers. We recently completed a three-spectral-channel combination setup, with a fiber amplifier in each channel and two synthesized pulse shapers covering all three spectra. 80nm combined spectrum is obtained, with a flat spectral phase. This ultra-broadband, energy-scalable approach of spectral combination with synthesized pulse shaping provides a path to high energy, tens-of-fs fiber lasers for driving plasma accelerators. © 2022 IEEE.

关键词： Plasma accelerators

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Programmable quantum emitter formation in silicon

Programmable quantum emitter formation in silicon

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Jhuria, Kaushalya Ivanov, Vsevolod Polley, Debanjan Liu, Wei Persaud, Arun Zhiyenbayev, Yertay Redjem, Walid Qarony, Wayesh Parajuli, Prabin Ji, Qing Gonsalves, Anthony Bokor, Jeffery Tan, Liang Kanté, Boubacar Schenkel, Thomas Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States Department of Physics and Nanotechnology SRM Institute of Science and Technology Kattankulathur Tamil Nadu Chennai India Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

ISBN: (纸本)9781957171395

关键词： Photons

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Programmable quantum emitter formation in silicon 2

Programmable quantum emitter formation in silicon

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Quantum Sensing, Imaging, and Precision Metrology II 2024

作者： Jhuria, K. Ivanov, V. Polley, D. Liu, W. Persaud, A. Zhiyenbayev, Y. Redjem, W. Qarony, W. Parajuli, P. Ji, Qing Gonsalves, A.J. Bokor, J. Tan, L.Z. Kanté, B. Schenkel, T. Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States Department of Physics and Nanotechnology SRM Institute of Science and Technology Kattankulathur Tamil Nadu Chennai India Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

ISBN: (纸本)9781510670846

Here, we demonstrate local writing and erasing of selected light-emitting defects using fs laser pulses in combination with hydrogen-based defect activation and passivation. By selecting forming gas (N2/H2) during thermal annealing of carbon-implanted silicon, we form Ci centers while passivating the more common G-centers. The Ci center is a telecom S-band emitter with very promising spin properties that consists of a single interstitial carbon atom in the silicon lattice. Density functional theory calculations show that the Ci center brightness is enhanced by several orders of magnitude in the presence of hydrogen. Fs-laser pulses locally affect the passivation or activation of quantum emitters with hydrogen and enable programmable quantum emitter formation in a qubit-by-design paradigm. © 2024 SPIE. All rights reserved.

关键词： Hydrogen

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Intrinsic origin and enhancement of topological responses in ferrimagnetic antiperovskite Mn4N

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Physical Review B 2024年第1期109卷 014430-014430页

作者： Temuujin Bayaraa Vsevolod Ivanov Liang Z. Tan Sinéad M. Griffin Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Molecular Foundry Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Using first-principles calculations we investigate the intrinsic origins of the anomalous Hall effect (AHE) and the anomalous Nernst effect (ANE) in antiperovskite ferrimagnet Mn4N. We predict that the AHE is significantly enhanced under both compressive and tensile strain; however, the ANE generally decreases under epitaxial strain, except for 1% compressive strain. We connect this behavior to the evolution of the Berry curvature with strain, suggesting similar strategies for achieving large AHE and ANE changes with modest amounts of strain. Finally, we find that the nonmonotonic characteristics of the AHE and ANE stem from the formation and movement of new Weyl points at the periphery of the Brillouin zone under compressive and tensile strains.

关键词： Anomalous Hall effect Epitaxial strain Nernst effect Ferrimagnets Thin films Topological materials Weyl semimetal Density functional theory Tight-binding model Wannier function methods

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Understanding training in superconducting accelerator magnets using acoustic emission diagnostics

arXiv

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arXiv 2022年

作者： Marchevsky, Maxim Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory United States

Among various long-standing standing problems in superconducting accelerator magnet development, training is one of the oldest and well-known issues affecting magnet performance. Understanding physics behind the training process is crucial for proper mitigation and elimination of this phenomenon in new magnet designs. This paper discusses application of acoustic emission (AE) diagnostics to localization and classification of transient mechanical events in superconducting magnets and characterization of transient energy releases responsible for premature quenching, memory effects and, ultimately, training. Prospective of future AE diagnostics development are outlined in connection to the goals of US Magnet Development Program. © 2022, CC BY.

关键词： Acoustic emission testing

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A Renewable Double Plasma Mirror For Petawatt-class Lasers

arXiv

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arXiv 2025年

作者： Czapla, Nick Nasir, Derek M. Obst-Huebl, Lieselotte Zingale, Anthony Bin, Jianhui Gonsalves, Anthony J. Steinke, Sven Nakamura, Kei Schroeder, Carl B. Esarey, Eric Geddes, Cameron G.R. Schumacher, Douglass W. SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Physics Department The Ohio State University ColumbusOH43210 United States Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Exceptional pulse contrast can be critical for ultraintense laser experiments, particularly when using solid density targets, and their use is becoming widespread. However, current plasma mirror technology is becoming inadequate for the new generation of high repetition rate, high power lasers now available. We describe a novel double plasma mirror configuration based on renewable, free standing, ultrathin liquid crystal films tested at the BELLA Petawatt Laser Center. Although operating at a repetition rate of several shots per minute, this system can be scaled to a high repetition rate exceeding 1 Hz and represents an important step towards enabling sustained, continuous operation of plasma mirrors. We demonstrate an improvement of two to three orders of magnitude in contrast and a total throughput of 80%. We present the first measurements of a beam reflected from a single or double plasma mirror system using a wavefront sensor, showing a well preserved wavefront and spatial mode. Finally, we introduce a model that predicts the total throughput through this double plasma mirror. This is the first model that accurately predicts the peak reflectivity of a plasma mirror when given the laser temporal profile. © 2025, CC BY-NC-ND.

关键词： Laser mirrors

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Quasiprobabilistic Readout Correction of Midcircuit Measurements for Adaptive Feedback via Measurement Randomized Compiling

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PRX Quantum 2025年第1期6卷 010307-010307页

作者： Akel Hashim Arnaud Carignan-Dugas Larry Chen Christian Jünger Neelay Fruitwala Yilun Xu Gang Huang Joel J. Wallman Irfan Siddiqi Quantum Nanoelectronics Laboratory Department of Physics University of California at Berkeley Berkeley California 94720 USA Applied Math and Computational Research Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Keysight Technologies Canada Kanata Ontario K2K 2W5 Canada Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Quantum measurements are a fundamental component of quantum computing. However, on present-day quantum computers, measurements can be more error prone than quantum gates and are susceptible to nonunital errors as well as nonlocal correlations due to measurement crosstalk. While readout errors can be mitigated in postprocessing, this is inefficient in the number of qubits due to a combinatorially large number of possible states that need to be characterized. In this work, we show that measurement errors can be tailored into a simple stochastic error model using randomized compiling, enabling the efficient mitigation of readout errors via quasiprobability distributions reconstructed from the measurement of a single preparation state in an exponentially large confusion matrix. We demonstrate the scalability and power of this approach by correcting readout errors without matrix inversion on a large number of different preparation states applied to a register of eight superconducting transmon qubits. Moreover, we show that this method can be extended to midcircuit measurements used for active feedback via quasiprobabilistic error cancellation, and we demonstrate the correction of measurement errors on an ancilla qubit used to detect and actively correct bit-flip errors on an entangled memory qubit. Our approach enables the correction of readout errors on large numbers of qubits and offers a strategy for correcting readout errors in adaptive circuits in which the results of midcircuit measurements are used to perform conditional operations on nonlocal qubits in real time.

关键词： Qubits

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