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Physics Exam IV - Coggle Diagram

- - - - Increases Voltage
      - Used to produce kV
      - (High tension)
    - - Decreases Voltage
      - Used to produce the low voltage needed to heat the cathode filament
  - - - (Top Left) Air Core
        
        Two coils of wire in close proximity
      - (Top Right) Open Core
        
        Add an iron core in the center of the coils
      - (Bottom Left) Closed Core
      - (Bottom Right) Shell Type
        
        Strongest magnetic field
- - - - Particle deposits in the tube
      - Reduces the vacuum in the tube
  - - - The Problem
        
        When kVp is increased, tube current also increases
      - The Solution
        
        A device (space charge compensator) is added to the filament circuit that automatically lowers the filament current as kVp is increased in the space charge limited region
  - - - When a High Voltage (kVp) is applied
        
        The cloud gets moved to the anode
        
        Electromotive Force (EMF)
        
        The electron cloud is repelled from the negative filament and attracted towards the positive anode.
        
        As kVp is increased, electron speed is increased
    - - Space Charge Limited
        
        As more electrons build up in the space cloud, the negative charges oppose each other
        
        Eventually prevents additional thermionic emission
- - - - Vaporized tungsten also increases tube filtration & decreased efficiency
  - - - Most vaporization of the filament occurs during "rotoring"