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

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Visualizing the Traversal of Charged Particles in a Diffusion Cloud Chamber

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Liquid Vs. Gases

Intermolecular Forces

Vapor Pressure

- Ionization Energy
- Temperature
- Condensation
- Ideal Gas Law

- 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

- Invented by Charles T. Wilson (1900)
- Used in some weather balloons

- Vapor Compression
- Charged Particle Detection
- Vapor Expansion
- Track production
- Recording of produced tracks
- Replenishing of Vapor

- Invented by Alexander Langsdorf Jr. (1936)
- Provides a continuous supply of vapor for the detection of ions tracks.

- Vapor/Gas Selection
- Creation of temperature gradient
- Diffusion of Vapor
- Continuous light supply

- Continuous-Diffusion Cloud Chamber
- Chamber Diameter/Height: 11cm/8cm
- Alpha & Beta Particles Used
- Cooling Method: Ice Water

- 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

- Path Widths
- Path Lengths
- Path Definition
- Color

- “Charged” Elastic Collisions
- Ionization of Ethanol Particles
- Ion-Initiated Droplet Formation
- Gradient-Continued Droplet Formation
- Cloud “Falling”

- “Floating” Clouds
- Rayleigh Scattering
- Mie Scattering
- Sunny Day Clouds (White)
- Rainy Day Clouds (Grey)

- 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

- Data portability and method of visualization
- What's the Minimum distance of “Action”? (Derivation)
- 3D field shape and “grid-definition

- Particle distribution (pseudo-random)
- Application of a Temp. Gradient

- Initial position
- Iterative collison formula (Derivation)
- Choose an Interesting path (Trial and Error)

- Collision Simulation (Iterative Calculation)
- Path Tracing

- 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

- Orientation of magnet and field lines direction
- Creation of charged particles (Electric Discharge)
- Direction of particles produced in field

Thanks!!

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.