Electron Gun

Creating an SEM was proven to be too difficult. The electron gun with a magnetic lens is a simplification of the project.

Idea

There are two parts to this project. The first would be to create the electron source which seems to be done with the use of a Lenard/Crookes tube [1]. Secondly, we would want to focus this electron beam into a spot with the use of a homemade magnetic lens (probably a solenoid of some form). We could perhaps perform a measurement of the focal length with respect to the magnetic field strength of the lens.

Team Members

Irvin Lim
Aliki Sofia Rotelli
Tan Chuan Jie
Lai Tian Hao

Equipments & Components

High Vacuum (HV) Components

• Roughing Pump
  
• Turbo Pump
  
• KF-25 Stainless Steel vacuum bellow (1 meter)
  
• CF-40 Stainless Steel Tee
  
• CF-40 Stainless Steel Cross
  
• CF-40 Stainless Steel Viewport
  
• CF-40 Stainless Steel High-voltage Dual Port Feedthroughs (x2)
  
• CF-40 Stainless Steel Multi-Pin Feedthrough, Double-Ended
  
• CF-40 to KF-25 Stainless Steel Flange Adapter

Electrical Components

• High Voltage Power Supply Unit (PSU) (up to 5kV)
  
• Current Controlled PSU

Beam Focusing Components

• Enzil Lens
  
• Pair parallel plates (x2)

Measurement Components

• RBD's 9103 USB Picoammeter, (Alternative: Multimeter)
  
• High Vacuum Digital Gauge, with range $(10^{-3}$ ~ $10^{-5})$ mbars
  
• Thermocouple

Other Components

• Filament (Possible Choice)
  
  • Tungsten (W)
  • Lanthanum Hexaboride(LaB6)
  • Cerium Hexaboride(CeB6)
• Phoshors
  • Zinc sulfide(ZnS) (Copper/Silver Activated)
• CF-40 Copper Gaskets