Visualizing the traversal of charged particles in a diffusion cloud chamber
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Visualizing the Traversal of Charged Particles in a Diffusion Cloud Chamber . Liquid Vs. Gases Intermolecular Forces Vapor Pressure. The Basics. Ionization Energy Temperature Condensation Ideal Gas Law. The Cloud Chamber?.

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Visualizing the Traversal of Charged Particles in a Diffusion Cloud Chamber

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Visualizing the traversal of charged particles in a diffusion cloud chamber

Visualizing the Traversal of Charged Particles in a Diffusion Cloud Chamber


The basics

Liquid Vs. Gases

Intermolecular Forces

Vapor Pressure

The Basics

  • Ionization Energy

  • Temperature

  • Condensation

  • Ideal Gas Law


The cloud chamber

The Cloud Chamber?

  • A sealed environment that contains supersaturated vapor in a non-condensing gas.

  • The condensation induced by the temperature gradient can mark the paths traveled by charged particles.

  • Two types: Expansion and Diffusion-Continuous


Expansion cloud chamber

Expansion Cloud Chamber

  • Invented by Charles T. Wilson (1900)

  • Used in some weather balloons


Expansion cloud chamber workings

Expansion Cloud Chamber Workings

  • Vapor Compression

  • Charged Particle Detection

  • Vapor Expansion

  • Track production

  • Recording of produced tracks

  • Replenishing of Vapor


Diffusion cloud chamber

Diffusion Cloud Chamber

  • Invented by Alexander Langsdorf Jr. (1936)

  • Provides a continuous supply of vapor for the detection of ions tracks.


Diffusion cloud chamber workings

Diffusion Cloud Chamber Workings

  • Vapor/Gas Selection

  • Creation of temperature gradient

  • Diffusion of Vapor

  • Continuous light supply


System in use

System in Use

  • Continuous-Diffusion Cloud Chamber

  • Chamber Diameter/Height: 11cm/8cm

  • Alpha & Beta Particles Used

  • Cooling Method: Ice Water


System in use cont

System in Use (Cont.)

  • Vapor/Gas Selection: 90% Ethanol (by volume), Air

  • Light Source: Orange LEDs (590 nm)

  • Floor Temp: -12 Degrees Celsius

  • Ceiling Temp: 23.1C


Show movie

Show Movie

Cloud Movie-Alpha


Cloud movie beta

Cloud Movie-Beta

Show Movie


Similarities differences

Similarities/Differences

  • Path Widths

  • Path Lengths

  • Path Definition

  • Color


What s happening

What's Happening?

  • “Charged” Elastic Collisions

  • Ionization of Ethanol Particles

  • Ion-Initiated Droplet Formation

  • Gradient-Continued Droplet Formation

  • Cloud “Falling”


Blue skies and clouds

Blue Skies and Clouds

  • “Floating” Clouds

  • Rayleigh Scattering

  • Mie Scattering

  • Sunny Day Clouds (White)

  • Rainy Day Clouds (Grey)


Another attempt at visualization

Another Attempt at Visualization

  • The Problem: How do Charge particles move to produce clouds?

  • Elastic “Charged” Collisions

  • Minimum distance of “Action”

  • Application of Measured Temperature Gradient

  • Simplify problem(Model Assumptions)

  • Solve Collision problems for a given path


Setting the stage

Setting the Stage

  • Data portability and method of visualization

  • What's the Minimum distance of “Action”? (Derivation)

  • 3D field shape and “grid-definition


Selecting the proper actors

Selecting the Proper Actors

  • Particle distribution (pseudo-random)

  • Application of a Temp. Gradient


Casting of main character

Casting of Main Character

  • Initial position

  • Iterative collison formula (Derivation)

  • Choose an Interesting path (Trial and Error)


Special effects

“Special Effects”

  • Collision Simulation (Iterative Calculation)

  • Path Tracing


What we did

What We Did...

  • Sat realistic goals for the visualization of physical events.

  • Recognized a problem and made reasonable simplifications

  • Picked a method for visualizing our chosen physical events

  • Constructed models based on “real” physical data

  • Added parts to demonstrate key physical events


Third attempt at visualization

Third Attempt at Visualization

  • Orientation of magnet and field lines direction

  • Creation of charged particles (Electric Discharge)

  • Direction of particles produced in field


Visualizing the traversal of charged particles in a diffusion cloud chamber

Thanks!!


Acknowledgments sources

Dr. Douglas Durig

Dr. Randolph Peterson

Comic Ray Theory. Bruno Rossi. 1941.

A Continuously Sensitive Diffusion Cloud Chamber. Alexander Langsdorf, Jr. 1938

A Theory of Diffusion Cloud Chambers. R. P. Shutt. 1951.

Acknowledgments/Sources


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