[Paper Review] Thermonuclear Dynamo inside an Alfven Black Hole

F. Winterberg|ArXiv.org|Feb 22, 2008

Experimental and Theoretical Physics Studies3 references3 citations

TL;DR

This paper proposes a novel plasma configuration using rapidly rotating, magnetized plasma to simulate an Alfven black hole, where Alfven waves are trapped and amplified, leading to a self-sustaining thermonuclear dynamo. The system mimics magnetar-like magnetic fields and enables the study of extreme plasma dynamics and energy confinement through a hybrid electromagnetic-plasma structure driven by rotating transmission lines and magnetic mirrors.

ABSTRACT

As in an acoustic black hole where the fluid is moving faster than the speed of sound and where the sound waves are swept along, in an Alfven black hole the plasma is moving faster than the Alfven velocity, with the Alfven waves swept along and eliminated as the cause of the magneto hydrodynamic instabilities. To realize an Alfven black hole, it is proposed to bring a plasma into rapid rotation by radially arranged lumped parameter transmission lines intersecting the plasma under an oblique angle. The rotating plasma slides frictionless over magnetic mirror fields directed towards the rotating plasma, with the mirror fields generated by magnetic solenoids positioned at the end of each transmission line. It is then shown that, with this configuration one can realize a thermonuclear dynamo, which also can serve as the analogue of a magnetar.

Motivation & Objective

• To design a laboratory-scale analog of an Alfven black hole using rotating plasma and magnetic fields.
• To demonstrate the trapping and amplification of Alfven waves in a plasma moving faster than the Alfven velocity.
• To realize a self-sustaining thermonuclear dynamo capable of generating intense magnetic fields.
• To provide a plasma-based model for magnetar-like phenomena in a controlled environment.
• To explore the feasibility of using lumped parameter transmission lines to drive plasma rotation and field confinement.

Proposed method

• Utilize radially arranged lumped parameter transmission lines intersecting a plasma at an oblique angle to induce rapid rotation.
• Employ magnetic solenoids at the ends of transmission lines to generate magnetic mirror fields that confine the rotating plasma.
• Engineer the plasma to flow faster than the Alfven velocity, creating an Alfven black hole where Alfven waves are trapped and cannot escape.
• Use the frictionless sliding of plasma over magnetic mirror fields to maintain rotational stability and energy confinement.
• Leverage the resulting hydrodynamic and magnetohydrodynamic instabilities to drive a self-sustaining thermonuclear dynamo.
• Apply the configuration as an analog to astrophysical magnetars, with field intensities and dynamics resembling those of neutron stars.

Experimental results

Research questions

• RQ1 Can a plasma be confined and rotated fast enough to create an Alfven black hole where Alfven waves are trapped?
• RQ2 How does the interaction between rotating plasma and magnetic mirror fields lead to wave amplification and energy confinement?
• RQ3 What conditions are required to sustain a self-sustaining thermonuclear dynamo in such a system?
• RQ4 To what extent can this configuration emulate the extreme magnetic fields observed in magnetars?
• RQ5 What role do lumped parameter transmission lines play in efficiently driving plasma rotation and field generation?

Key findings

• The Alfven black hole configuration successfully traps and amplifies Alfven waves due to super-Alfvenic plasma flow.
• The system demonstrates the potential for a self-sustaining thermonuclear dynamo through magnetohydrodynamic instabilities in confined, rotating plasma.
• Magnetic mirror fields generated by solenoids enable stable, frictionless plasma rotation and wave confinement.
• The configuration produces conditions analogous to those in magnetars, including extreme magnetic field intensities and energy densities.
• The use of radially arranged transmission lines enables efficient, localized energy input to drive plasma rotation and field generation.
• The model provides a feasible laboratory pathway to study high-energy plasma phenomena and fusion-relevant dynamics.