Electron Density and Temperature in NIO1 RF Source Operated in Oxygen and ArgonThe NIO1 experiment, built and operated at Consorzio RFX, hosts an RF negative ion source, from which it is possible to produce a beam of maximum 130 mA in H- ions, accelerated up to 60 kV. For the…M. Barbisan, B. Zaniol, M. Cavenago et al.·Nov 8, 2022SaveLearn
Influence of the magnetic filter field topology on the beam divergence at the ELISE test facilityThe ELISE test facility hosts a RF negative ion source, equipped with an extraction system which should deliver half the current foreseen for the ITER Neutral Beam Injector, keeping the ratio of…M. Barbisan, U. Fantz, D. Wünderlich·Nov 7, 2022SaveLearn
Electron dynamics in planar radio frequency magnetron plasmas: II. Heating and energization mechanisms studied via a 2d3v particle-in-cell/Monte Carlo codeThe present work investigates electron transport and heating mechanisms using an (r, z) particle-in-cell (PIC) simulation of a typical rf-driven axisymmetric magnetron discharge with a conducting…D. Eremin, B. Berger, D. Engel et al.·Nov 7, 2022SaveLearn
Beam characterization by means of emission spectroscopy in the ELISE test facilityThe ELISE test facility at IPP Garching hosts a RF H-/D- ion source and an acceleration system. Its target is to demonstrate the performance foreseen for the ITER NBI system in terms of extracted…M. Barbisan, F. Bonomo, U. Fantz et al.·Nov 7, 2022SaveLearn
First hydrogen operation of NIO1: characterization of the source plasma by means of an optical emission spectroscopy diagnosticNIO1 is a compact and flexible radiofrequency H- ion source, developed by Consorzio RFX and INFN-LNL. Aim of the experimentation on NIO1 is the optimization of both the production of negative ions…M. Barbisan, C. Baltador, B. Zaniol et al.·Nov 7, 2022SaveLearn
Data Processing Techniques for Ion and Electron Energy Distribution FunctionsRetarding field energy analyzers and Langmuir probes are routinely used to obtain ion and electron energy distribution functions (IEDF, EEDF). These typically require knowledge of the first and…Antonella Caldarelli, Félicien Filleul, Rod Boswell et al.·Nov 7, 2022SaveLearn
Laboratory observation of ion acceleration via reflection off laser-produced magnetized collisionless shocksFermi acceleration by collisionless shocks is believed to be the primary mechanism to produce high energy charged particles in the Universe,where charged particles gain energy successively from…Hui-bo Tang, Yu-fei, Hao et al.·Nov 6, 2022SaveLearn
On the collisional damping of plasma velocity space instabilitiesFor plasma velocity space instabilities driven by particle distributions significantly deviated from a Maxwellian, weak collisions can damp the instabilities by an amount that is significantly beyond…Yanzeng Zhang, Xian-Zhu Tang·Nov 4, 2022SaveLearn
Modeling and simulation of a beam emission spectroscopy diagnostic for the ITER prototype neutral beam injectorA test facility for the development of the Neutral Beam Injection system for ITER is under construction at Consorzio RFX. It will host two experiments: SPIDER, a 100 keV H-/D- ion RF source, and…M. Barbisan, B. Zaniol, R. Pasqualotto·Nov 4, 2022SaveLearn
Zonal Flow Excitation in Electron-Scale Tokamak TurbulenceThe derivation of an intermediate-scale gyrokinetic-electron theory in nonuniform tokamak plasmas [Chen H. et al 2021 Nucl. Fusion 61 066017] has shown that a Navier-Stokes type nonlinearity couples…Stefan Tirkas, Haotian Chen, Gabriele Merlo et al.·Nov 3, 2022SaveLearn
The gyrokinetic dispersion relation of microtearing modes in collisionless toroidal plasmasWe solve the linearized gyrokinetic equation, quasineutrality condition, and Ampere's law to obtain the dispersion relation of microtearing modes (MTMs) in collisionless low-beta toroidal…Benjamin D. G. Chandran, Alexander A. Schekochihin·Nov 3, 2022SaveLearn
Characterization of Cs-free negative ion production in the ion source SPIDER by Cavity Ring-Down SpectroscopyThe Neutral beam Injectors of the ITER experiment will be based on negative ion sources for the generation of beams composed by 1 MeV H/D particles. The prototype of these sources is currently under…M. Barbisan, R. Agnello, G. Casati et al.·Nov 3, 2022SaveLearn
Characterization of cesium and H-/D- density in the negative ion source SPIDERThe Heating Neutral Beam Injectors (HNBs) for ITER will have to deliver 16.7 MW beams of H/D particles at 1 MeV energy. The beams will be produced from H-/D- ions, generated by a radiofrequency…Marco Barbisan, R. Agnello, L. Baldini et al.·Nov 3, 2022SaveLearn
Modeling and design of a BES diagnostic for the negative ion source NIO1Consorzio RFX and INFN-LNL are building a flexible small ion source (NIO1) capable of producing about 130 mA of H- ions accelerated at 60 KeV. Aim of the experiment is to test and develop the…M. Barbisan, B. Zaniol, M. Cavenago et al.·Nov 3, 2022SaveLearn
Runaway electron current reconstitution after a non-axisymmetric magnetohydrodynamic flushBenign termination of mega-ampere (MA) level runaway current has been convincingly demonstrated in recent JET and DIII-D experiments, establishing it as a leading candidate for runaway mitigation on…Christopher J. McDevitt, Xian-Zhu Tang·Nov 3, 2022SaveLearn
Design and preliminary operation of a laser absorption diagnostic for the SPIDER RF sourceThe ITER Heating Neutral Beam (HNB) injector is required to deliver 16.7 MW power into the plasma from a neutralised beam of H-/D- negative ions, produced by an RF source and accelerated up to 1 MeV.…M. Barbisan, R. Pasqualotto, A. Rizzolo·Nov 3, 2022SaveLearn
Twisted plasma waves driven by twisted ponderomotive forceWe present results of twisted plasma waves driven by twisted ponderomotive force. With beating of two, co-propagating, Laguerre-Gaussian (LG) orbital angular momentum (OAM) laser pulses with…Yin Shi, D. R. Blackman, R. J. Kingham et al.·Nov 3, 2022SaveLearn
Electron pulse train accelerated by a linearly polarized Laguerre-Gaussian laser beamA linearly polarized Laguerre-Gaussian (LP-LG) laser beam with a twist index l = -1 has field structure that fundamentally differs from the field structure of a conventional linearly polarized…Yin Shi, David R Blackman, Ping Zhu et al.·Nov 3, 2022SaveLearn
Experimental Study of a Low-Voltage Pulsed Plasma Thruster for NanosatellitesIn this paper, a coaxial pulsed plasma thruster was designed, built, and tested. This design confirmed PPT operation at substantially reduced discharge voltages of 100 to 200 V across the discharge…Patrick Gresham, Brian Jeffers, Alexey Shashurin·Nov 2, 2022SaveLearn
Data-driven modeling of Landau damping by physics-informed neural networksKinetic approaches are generally accurate in dealing with microscale plasma physics problems but are computationally expensive for large-scale or multiscale systems. One of the long-standing problems…Yilan Qin, Jiayu Ma, Mingle Jiang et al.·Nov 2, 2022SaveLearn
Observation of tungsten impurity suppression with ECRH by an X-ray Crystal Spectrometer on EASTImpurity degrades tokamak plasmas confinement by causing energy loss, diluting the fuel concentration, even terminating the discharges in some extreme cases. Previously, the suppression effects of…Lin Zichao, Zhang Hongming, Wang Fudi et al.·Oct 31, 2022SaveLearn
Resolving the mystery of electron perpendicular temperature spike in the plasma sheathA large family of plasmas has collisional mean-free-path much longer than the non-neutral sheath width, which scales with the plasma Debye length. The plasmas, particularly the electrons, assume…Yanzeng Zhang, Yuzhi Li, Bhuvana Srinivasan et al.·Oct 30, 2022SaveLearn
Regimes of charged particle dynamics in current sheets: the machine learning approachCurrent sheets are spatially localized almost-1D structures with intense plasma currents. They play a key role in storing the magnetic field energy and they separate different plasma populations in…Alexander Lukin, Anton Artemyev, Dmitri Vainchtein et al.·Oct 30, 2022SaveLearn
Azimuthal structures and turbulent transport in Penning dischargeAzimuthal structures in cylindrical Penning discharge are studied with 2D3V radial-azimuthal PIC/MCC model with the axial magnetic field. The discharge is self-consistently supported by ionization…M. Tyushev, M. Papahn Zadeh, V. Sharma et al.·Oct 30, 2022SaveLearn
High-Pressure CO2 Dissociation with Nanosecond Pulsed DischargesThe efficiency of the conversion of CO2 into CO with nanosecond repetitively pulsed discharges (NRP) is investigated in a high pressure batch reactor. Stable discharges are obtained at up to…Erwan pannier, Taemin Yong, Christophe Laux et al.·Oct 29, 2022SaveLearn