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

1) Roughing Pump
2) Turbo Pump
3) KF-25 Stainless Steel vacuum bellow (1 meter)
4) CF-40 Stainless Steel Tee
5) CF-40 Stainless Steel Cross
6) CF-40 Stainless Steel Viewport
7) CF-40 Stainless Steel High-voltage Dual Port Feedthroughs (x2)
8) CF-40 Stainless Steel Multi-Pin Feedthrough, Double-Ended
9) CF-40 to KF-25 Stainless Steel Flange Adapter

Electrical Components

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

Beam Focusing Components

1) Enzil Lens
2) Pair parallel plates (x2)

Measurement Components

1) RBD's 9103 USB Picoammeter, (Alternative: Multimeter)
2) High Vacuum Digital Gauge
3) Thermocouple