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

Measurement Components

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