Pra.Ma.

• Unique design, incorporating both the high voltage and thermocouple feedthroughs (optional) on an exclusively designed 2" linear motion thimble.
  
• Fixed thermocouple allowing the instrument to be used as a true e-beam heated effusion cell.
• Evaporation zone completely enclosed in a water-cooled copper shroud.
  
• Filament assembly constructed as an easily replaced unit. User may replace just the filament using standard tungsten wire. Spare filament assemblies can be purchased or prepared in advance and can be quickly and easily replaced without disassembling the evaporator head.
• Even heat distribution through filament encircling the rod or crucible. Higher temperatures possible without local damage to crucibles.
• Long filament design allowing operation at lower temperatures with a consequent improvement in filament lifetime.
• Fine control of the electron emission current.
  
• Simple, rugged and modular power supply design.
  Power supply generates enough power to evaporate the thickest rods (6mm) and is also robust enough to survive misuse without the dire consequences seen in more complex failure-prone electronics.

Applications:

• Pt: Thin films, surface science. From rod/crucible.
• Cr: Metalising, contacting. From rod - sublimes.
• Al₂O₃: Optical films, oxide films. From crucible.
• C: Doping, SEM sample preparation. From rod.
• Au, Ag: Metalising, contacting. From crucible.
• Cu: Surface science. From crucible.
• Nb: From rod.

Product description:

The SPECS EBE-1 is a combined mini e-beam evaporator and e-beam heated effusion cell and is capable of evaporating small quantities of almost any material. The material either in rod form, or in a crucible, is heated by electron bombardment from the surrounding filament. The capacity for electrons to be directed to deliver their energy in a confined area, leads to extremely high power densities and local heating, allowing temperatures in excess of 3000 K to be reached.

Two modes of operation:

e-beam heated effusion cell

The EBE-1 is designed so that an optional thermocouple may be fitted to measure the temperature near the rod or crucible. The temperature can therefore be used, as in conventional effusion cells, to control the power supply via a PID controller. The result is an e-beam evaporator with the operational characteristics, in terms of stability and repeatability, of conventional effusion cells, with which many users will already be familiar.

e-beam evaporator

In "standard" mode the evaporator is controlled either manually or with the flux monitor option. The power is adjusted to give the desired evaporation rates.