How to Choose an E-Beam Power Supply: New vs. Refurbished, Power, Controls & Compatibility

Choosing an electron beam power supply is not as simple as matching the kW rating printed on the front of the old unit.

The power supply is part of a complete electron-beam evaporation system, and a replacement must work with:

Electron-beam source
Number of guns
Required output power
High-voltage range
Emission current
Facility electrical supply
Sweep controller
Deposition controller
Safety interlocks
High-voltage cables
Cooling system
Existing chamber controls

YTI offers new and refurbished electron beam power supplies while also supporting repair and refurbishment of existing vacuum coating electronics.

This guide explains what should be evaluated before choosing a replacement.

1. Start With the Electron Beam Source

The first question should not be:

“How many kilowatts is my current supply?”

It should be:

“What electron-beam source am I operating?”

Identify:

Manufacturer
Model
Number of guns
Hearth configuration
Source power rating
Filament or emitter configuration
High-voltage requirements

Different e-beam sources have different operating requirements.

Commercial suppliers therefore design power supplies around specific source applications. Telemark offers supplies for single- and multiple-source operation, while Ferrotec offers high-voltage supplies specifically designed for e-gun sources.

YTI also supplies:

Source and supply should be evaluated together.

2. Determine the Required Power

Electron-beam power supplies are commonly described by maximum kW output.

But the required power depends on the process.

Consider:

Material being evaporated
Desired deposition rate
Crucible size
Source design
Chamber geometry
Throw distance
Production throughput
Number of sources

A small research chamber does not necessarily need the same power as a production coating system running large-volume or high-rate deposition.

Current commercial source systems cover a wide power range. Telemark, for example, offers certain high-capacity sources in 10 kW and 15 kW configurations, while Ferrotec’s Carrera power supplies span several output capacities.

More Power Is Not Automatically Better

Oversizing a power supply does not automatically improve the process.

The complete system still has limits determined by:

Source
Cooling
Material
Crucible
High-voltage components
Process recipe

Choose enough capacity for the required process with appropriate margin rather than selecting the largest available unit by default.

3. Single Gun, Dual Gun or Multi-Gun?

Determine how many electron-beam sources the power supply must operate.

Single-Gun

Best suited to systems built around one e-beam source.

Dual-Gun

Can support systems using two independent sources or more complex coating sequences.

Multi-Gun

Some power supplies can operate three sources sequentially or simultaneously depending on the control architecture and available total power.

Ferrotec’s Carrera platform includes configurations for up to three evaporators.

When replacing an older supply, determine whether the existing system truly requires multiple outputs or whether the chamber has been modified since installation.

4. Verify High Voltage and Emission Requirements

Two supplies with the same kW rating may still operate very differently.

Verify:

High-voltage range
Maximum emission current
Filament supply requirements
Control response
Arc handling
Source polarity
Grounding architecture

The power supply needs to operate inside the range expected by the e-beam source.

Changing those conditions can affect:

Beam formation
Source behavior
Arc frequency
Maximum power
Process stability

Do not assume electrical compatibility from the front-panel power rating alone.

5. Verify Facility Power

A technically compatible e-beam supply may still be unusable if the facility cannot power it.

Confirm:

Input voltage
Phase
Frequency
Available current
Disconnect size
Transformer requirements
Grounding

This becomes particularly important when replacing equipment originally designed for another region or when installing a refurbished unit from a different system.

Telemark specifically offers incoming-voltage options intended to accommodate different installation locations.

Photograph the existing nameplate before requesting a replacement.

6. Identify the Sweep Controller

The sweep controller determines how the beam moves across the evaporation material.

A replacement power supply may need to interface with existing:

X-axis sweep
Y-axis sweep
Pattern controls
Beam-position electronics
Source controls

Do not assume the existing sweep electronics communicate with every replacement supply.

Document:

Sweep-controller manufacturer
Model
Control connectors
Analog signals
Digital signals
Existing drawings

YTI also supplies and supports electron beam sweep controllers.

7. Check Deposition-Rate Feedback

Many coating systems use a crystal monitor or deposition controller to automatically regulate the process.

The controller may provide an output signal that changes beam power according to measured deposition rate.

Before changing the power supply, determine:

Deposition-controller manufacturer
Output signal type
Power-control interface
Rate feedback method
Existing process recipe

Ferrotec’s Genius controller provides an example of this type of integrated control architecture, combining source-control parameters with compatible power supplies.

Replacing a supply without maintaining the feedback interface can turn a previously automated process into a manual one.

8. Review Safety Interlocks

Electron-beam evaporation combines high voltage, substantial electrical power, vacuum equipment and cooling water.

The supply commonly interacts with safety and process permissives.

These may include:

Chamber vacuum
Cooling-water flow
Cabinet doors
Source status
Emergency stop
High-voltage enable
Process controller
Arc protection

When replacing legacy electronics, determine which interlocks are built into:

Power supply
Chamber PLC
Source controller
External relay logic

A replacement should preserve the required safety architecture rather than bypassing it for convenience.

9. Check High-Voltage Cables and Connectors

Mechanical compatibility matters too.

Before selecting a supply, document:

High-voltage connector type
Cable condition
Cable length
Source connections
Ground connections
Control connectors
Rack dimensions
Cabinet space

Replacing a power supply can become a much larger engineering project if every cable and control connection also has to be redesigned.

10. New or Refurbished?

Both can make sense.

Reasons to Choose New

A new e-beam power supply can be attractive when:

Building a new system
Modernizing controls
Increasing power
Adding sources
Existing equipment is obsolete beyond economical repair
Long-term standardized support is important

Reasons to Choose Refurbished

Refurbished equipment may be attractive when:

Replacing a legacy unit
Existing source and wiring need to remain
A compatible model is available
Budget matters
Faster integration is desirable
A proven older platform fits the process well

YTI maintains new and refurbished equipment paths and also refurbishes legacy electronics in its in-house lab.

Explore current options:

New & Refurbished Electron Beam Power Supplies

11. Should You Repair the Existing Unit Instead?

Before replacing a power supply, determine what is actually wrong with it.

A repair can make more sense when:

One fault has developed
The supply previously operated reliably
The unit still fits the process
Integration would make replacement expensive
The problem is economically repairable

YTI provides component-level electronics and power supply repair for e-beam high-voltage supplies, including HV faults, arcing and emission problems.

If you are not sure whether the existing unit has failed, read:

Electron Beam Power Supply Troubleshooting: 7 Common Problems & What They Mean

12. When Does Refurbishment Make More Sense?

Refurbishment sits between a simple repair and complete replacement.

It can be especially useful when:

The unit is obsolete but valuable
Multiple components are aging
Reliability has declined
Output is drifting
Cooling components are weak
Previous repairs are accumulating
Replacement would require major integration work

A refurbishment can involve:

Cleaning
Inspection
Board repair
Capacitor replacement
Relay replacement
Fan replacement
Wiring correction
Connector repair
High-voltage section repair
Calibration
Load testing

YTI’s refurbishment process evaluates the entire assembly and replaces worn or age-sensitive components rather than stopping after one failed component is corrected.

Learn more:

Electronics & Power Supply Refurbishment

Quick Selection Checklist

Before requesting a quote, collect:

Existing Power Supply

Manufacturer
Model
Serial number
Maximum power
Input voltage
Input phase
High-voltage range
Emission rating

Electron Beam Source

Manufacturer
Model
Number of guns
Number of hearths
Power rating

Controls

Sweep-controller model
Deposition-controller model
Crystal-monitor model
Chamber-controller information

Connections

High-voltage cable photos
Rear-panel photos
Control connector photos
Wiring diagrams

Process

Material being evaporated
Normal operating kW
Typical deposition rate
Production or research use
Reason for replacement

Equipment Strategy

Tell YTI whether you are considering:

New
Refurbished
Repair
Refurbishment
Complete system upgrade

Example Decision Paths

Existing Supply Failed Once

Best starting point: Repair

If the unit has been reliable for years and suddenly develops one fault, evaluate it before replacing it.

Existing Supply Fails Repeatedly

Best starting point: Refurbishment

A deeper rebuild may provide better long-term reliability than continuing isolated repairs.

Existing Supply Is Obsolete but the Chamber Works Well

Best starting point: Refurbished compatible unit or refurbishment

Maintaining existing system compatibility may reduce integration work.

Adding Another Electron Beam Gun

Best starting point: New or different multi-gun power-supply platform

The old supply may not have the required output or control architecture.

Complete Chamber Modernization

Best starting point: New power supply and control integration

A modernization project can coordinate power, source, sweep, deposition feedback and chamber controls together.

Understand the System Before You Choose

If you want a deeper explanation of how the supply, source, sweep electronics and deposition controls interact, start with:

What Is an Electron Beam Power Supply? A Guide to E-Beam Evaporation

That foundation makes power-supply selection considerably easier.

Continue the YTI Electron Beam Power Supply Series

Learning how e-beam power works?

Read:

What Is an Electron Beam Power Supply? A Guide to E-Beam Evaporation

Troubleshooting an existing unit?

Read:

Electron Beam Power Supply Troubleshooting: 7 Common Problems & What They Mean

Ready to look at equipment?

Visit:

New & Refurbished Electron Beam Power Supplies

Need Help Matching a Power Supply to Your System?

YTI can review the existing e-beam gun, power supply, sweep controller, deposition controls, facility power and chamber configuration before recommending a new, refurbished, repair or refurbishment path.

Send:

Make
Model
Nameplate
Source information
Gun count
Power requirement
Facility voltage
Photos
Drawings when available

Request an E-Beam Power Supply Review
Call (860) 429-1908