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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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
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
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.