The Mochi.LabJet experiment for measurements of canonical helicity injection in a laboratory astrophysical jet
arXiv:1711.07213 · doi:10.3847/1538-4365/aaba6f
Abstract
The Mochi device is a new pulsed power plasma experiment designed to produce long, collimated, stable, magnetized plasma jets when set up in the LabJet configuration. The LabJet configuration aims to simulate an astrophysical jet in the laboratory by mimicking an accretion disk threaded by a poloidal magnetic field with concentric planar electrodes in front of a solenoidal coil. The unique setup consists of three electrodes, each with azimuthally symmetric gas slits. Two of the electrodes are biased independently with respect to the third electrode to control the radial electric field profile across the poloidal bias magnetic field. This design approximates a shear azimuthal rotation profile in an accretion disk. The azimuthally symmetric gas slits provide a continuously symmetric mass source at the footpoint of the plasma jet, so any azimuthal rotation of the plasma jet is not hindered by a discrete number of gas holes. The initial set of diagnostics consists of current Rogowski coils, voltage probes, magnetic field probe arrays, an interferometer and ion Doppler spectroscopy, supplemented by a fast ion gauge and a retarding grid energy analyzer. The measured parameters of the first plasmas are 1E22 m-3, 0.4 T, 5-25 eV, with velocities of 20-80 km/s. The combination of a controllable electric field profile, a flared poloidal magnetic field, and azimuthally symmetric mass sources in the experiment successfully produces short-lived (10 μs, >5 Alfvén times) collimated magnetic jets with ~10:1 aspect-ratio and long-lived (100 μs, >40 Alfvén times) flow-stabilized, collimated, magnetic jets with ~30:1 aspect-ratio.
arXiv commentAccepted for publication in The Astrophysical Journal Supplement
References in corpus (30)
- Origin of Galactic and Extragalactic Magnetic Fields
- Stability of Relativistic Jets from Rotating, Accreting Black Holes via Fully Three-Dimensional Magnetohydrodynamic Simulations
- On the Origin of Cosmic Magnetic Fields
- Instability of toroidal magnetic field in jets and plerions
- Minute-Timescale >100 MeV gamma-ray variability during the giant outburst of quasar 3C 279 observed by Fermi-LAT in 2015 June
- Laboratory Astrophysics and Collimated Stellar Outflows: The Production of Radiatively Cooled Hypersonic Plasma Jets
- Experimental Identification of the Kink Instability as a Poloidal Flux Amplification Mechanism for Coaxial Gun Spheromak Formation
- Collimation, Proper Motions, and Physical Conditions in the HH 30 Jet From HST Slitless Spectroscopy
- A Laboratory Plasma Experiment for Studying Magnetic Dynamics of Accretion Discs and Jets
- Modeling the Large Scale Structures of Astrophysical Jets in the Magnetically Dominated Limit
- Three-dimensional Simulations of AGN Jets: Magnetic Kink Instability versus Conical Shocks
- Relativistic Poynting Jets from Accretion Disks
- Spatial growth of current-driven instability in relativistic rotating jets and the search for magnetic reconnection
- On the jets, kinks, and spheromaks formed by a planar magnetized coaxial gun
- Dynamic and Stagnating Plasma Flow Leading to Magnetic Flux Tube Collimation
- Magnetic Fields in Stellar Jets
- Spatial Growth of the Current-Driven Instability in Relativistic Jets
- Formation and Primary Heating of The Solar Corona - Theory and Simulation
- The Madison plasma dynamo experiment: a facility for studying laboratory plasma astrophysics
- Electron and ion heating characteristics during magnetic reconnection in MAST
- Why current-carrying magnetic flux tubes gobble up plasma and become thin as a result
- Supersonic radiatively cooled rotating flows and jets in the laboratory
- A Spherical Plasma Dynamo Experiment
- A field theory approach to the evolution of canonical helicity and energy
- The Transport of Relative Canonical Helicity
- Emergent kink stability of a magnetized plasma jet injected into a transverse background magnetic field
- Heterodyne interferometer with unequal path lengths
- A two-fluid helicity transport model for flux-rope merging
- Sausage Instabilities on Top of Kinking Lengthening Current-Carrying Magnetic Flux Tubes
- The Topology of Canonical Flux Tubes in Flared Jet Geometry