UV Source UVS 40A2

High intensity photon source that can be operated with a variety of discharge gases.



Prevac are a world leader in the design and production of analytical and deposit scientific and research equipment. Their systems operate in a high and ultra high vacuum environment. They design and construct UHV and HV systems fully adapted to the individual requirements of research projects and industrial applications.

Key Features

  • Can be operated with various discharge gases
  • Manual or auto ignition
  • Control of the He I / He II ratio via precise adjustment of helium pressure and discharge current
  • Easy operation
  • Stable output
  • Special designed discharge chamber
  • Electronically stabilised discharge current
  • Windowless, direct sight connection


The UVS 40A2 is used in UPS (ultraviolet photoelectron spectroscopy) research. The UVS is water cooled for maximum stability and features fully interlocked safety circuitry. The discharge has a maximum photon intensity at a pressure of several mbar so dual differential pumping stages are employed in order to maintain the host chamber pressure. The UVS 40A2 is designed so that a continuous gas flow is maintained through the discharge region. This is a great advantage in maintaining the cleanliness of the discharge capillary and results in very long service intervals.

Technical data

Mounting flange DN 40CF (non-rotatable)
Gases He, Ar (option: Kr, Xe, Ne)
Photocurrent 1 – 80 nA
Photon flux >1016 photons / s*sr
He I / He II ratio better than 3:1
Water cooling required, pressure 2 – 3 bar (max. 6 bar), flow > 1.5 l/min, Tmax= 30 °C
Port aligner integral , +/- 4°
Discharge current 40 – 300 mA
Beam divergence small beam divergence: <1°
Capillary I.D. 1.5 mm (others on request)
Insertion length 220 mm (standard), other on request, OD: 9.5 mm
FWHM dependent on working distance (e.g. 1.2 mm for distance 10 mm)
Typical working distance 5 – 100 mm (optimum 5 – 50 mm)
Bakeout temperature up to 200 °C
Working pressure < 1 mbar



Instruments with Electronics Brochure

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  • Gas dosing system
  • Customised insertion length
  • Linear shift (50 – 100 mm)
  • Vacuum Gauges set
  • Chiller

Service Support

Comprehensive repairs and servicing

Annual Support Programs

Your metrology instrumentation is a major investment that is critical to your business operation and success. In today’s competitive climate, it is more important than ever to extend the functionality and peak performance of your metrology equipment years beyond the expiration of your factory warranty. CN Tech’s Support Programs will help ensure that your investment is protected, and that you and your instrument’s are always operating at peak performance.

With over 20 years’ experience servicing and repairing you can be assured that your system is in safe hands. The independent services we offer include system relocation, maintenance visits, parts and consumables, and break down interventions.

CN Tech’s Support Programs are an economical way to guarantee optimal working condition:

  • Annual Preventive Maintenance
  • Priority Technical Assistance
  • Preferred Parts Availability
  • On-Site User Training
  • Remote Diagnostics
  • No surprise repair expense and much more!

Support Contact Example

An example of our service and support contracts are shown below:


Metrology & Instrumentation Annual Support Programs 2022/23

CN Tech's Support Programs will help ensure that your investment is protected, and that you and your instrument’s are always operating at peak performance.

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