# EPA Series (Axial Electron Gun)

> Original page (HTML): https://vaclab.ru/electron_beam_equipment/epa-120-electron-gun
> Markdown version: https://vaclab.ru/electron_beam_equipment/epa-120-electron-gun.md
> Manufacturer: LLC "Laboratory of Vacuum Technologies Plus" (LVT), vaclab.ru

EPA Series (Axial Electron Gun)


Technical Specifications and Modifications

The gun's output parameters depend on the installed cathode diameter. Operating at a maximum accelerating voltage of 35 kV (operating range 20–35 kV), the following performance is achieved:



- **?12 mm Cathode:** beam current up to 5 A, power up to **175 kW**.

- **?15 mm Cathode:** beam current up to 8 A, power up to **280 kW**.

- **?20 mm Cathode:** beam current up to 16 A, power up to **560 kW**.




Control System

Precision beam control and focusing are managed by the **BUEL 361 Electron Beam Control Unit**. The system provides:



- Static and dynamic beam deflection within **±45°**.

- Maximum scanning frequency up to **500 Hz**.

- Smooth power adjustment via emission current or accelerating voltage levels.




Vacuum System


- **Pumping Requirements:** requires a high-vacuum pump with a capacity of at least **300 l/s**.

- **Autonomy:** an integrated high-vacuum valve allows for independent venting and evacuation of the gun without breaking the vacuum in the main process chamber (e.g., for rapid cathode replacement).

- **Enhanced Stability:** for processes with high outgassing (such as raw melting), an additional differential pumping stage can be installed.




Design Advantages


- **Versatility:** a wide power range allows a single gun to perform both precision operations and intensive heating.

- **Mounting Flexibility:** the pumping port and deflection system axes can be positioned at any angle relative to the technological installation.

- **Compactness:** air-cooled cathode assembly; power is supplied via three high-voltage cables with a core cross-section of only 4 mm?.




Modernization

EPA series guns serve as a direct and efficient replacement for obsolete EP series (USSR) units, as well as EH and KSR systems (Germany).




Manufacturer: LLC "Vacuum Technology Laboratory Plus"

## Technical specifications

- Maximal beam current: 8 A
- Anode voltage range: 20..35 kV
- Type: Incandescent
- Beam deflection range (static): ±45°
- Beam deflection range (dynamic): ±45°
- Maximal beam deflection frequency: 500 Hz
- Cathode material: Tungsten
- Pumping rate: 300 l/s
- Nominal power: 120 kW
- Maximal power: 250 kW
- HV parts cooling: Air