Understanding Particle Movement in a Magnetic Bottle: Field vs. Field Lines

In summary, there is some confusion about whether particles trapped in a magnetic bottle travel around the magnetic field or around each magnetic field line. While it may seem logical for them to travel around the field, the width of their spirals actually depends on their orthogonal momentum. The magnetic field itself does not affect the particles, but rather it is their own velocity and the force in the axial direction that causes their oscillation. Therefore, it is not correct to count the number of field lines as a measure of particle movement.
  • #1
Samson4
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Which is correct? It's almost split 50/50 when I search online. Do the particles trapped in a magnetic bottle travel around the magnetic field or around each magnetic field line? It makes more sense for them to travel around the field because the field is what changes in density not each line. Is this correct?

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  • #2
You cannot count field lines. The width of their spirals depends on their momentum orthogonal to the magnetic field.
 
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  • #3
Magnetic field does not work on the particle trapped in the magnetic bottle, it just changes their direction. It is the velocity of the particle itself and the force in the axial direction which causes the oscillation.
 

FAQ: Understanding Particle Movement in a Magnetic Bottle: Field vs. Field Lines

1. What is a magnetic mirror/bottle?

A magnetic mirror/bottle is a device used to trap and contain plasma (ionized gas) using magnetic fields. It consists of a magnetic field that is stronger at one end, creating a "mirror effect" that prevents the plasma from escaping.

2. How does a magnetic mirror/bottle work?

A magnetic mirror/bottle works by using a combination of magnetic fields to trap plasma particles in a specific area. The magnetic field is strongest at one end, creating a "mirror effect" that reflects the particles back towards the center, preventing them from escaping.

3. What is the purpose of a magnetic mirror/bottle?

The purpose of a magnetic mirror/bottle is to contain and control plasma for various applications, such as fusion research, plasma propulsion, and plasma-based technologies. It allows scientists to study and manipulate plasma in a controlled environment.

4. How is a magnetic mirror/bottle created?

A magnetic mirror/bottle is created by using a series of magnets arranged in a specific configuration to create a strong magnetic field. The magnets are often superconducting and require precise placement and alignment to achieve the desired effect.

5. What are the advantages of using a magnetic mirror/bottle?

There are several advantages to using a magnetic mirror/bottle, including the ability to confine plasma for extended periods of time, the relatively simple design compared to other plasma confinement techniques, and the potential for use in various applications such as fusion energy and plasma-based propulsion systems.

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