Eaton (now Axcelis) NV-6200 medium-current ion implanter

The NV-6200 and its lineage

Eaton was one of the main implanter builders of the 1980s and 1990s, and the NV-6200 was its medium-current workhorse of that era. Eaton's semiconductor equipment business became Axcelis Technologies in 2000, which is why the tool is often listed as "Eaton/Axcelis". A used Eaton NV-6200 is a straightforward machine by today's standards: a Freeman-type ion source, mass analysis, acceleration to the implant energy and a dose integrated on a Faraday cup. That simplicity is its appeal for research groups and small fabs that want to understand and maintain their own implanter.

Published work on the NV-6200 has looked at running multiply charged phosphorus, boron and arsenic ions from a modified Freeman source to reach energies above the single-charge limit. In practice this means a well-tuned NV-6200 can cover deeper implants at low beam current, which suits research doses better than production ones. It sits with the other medium-current tools in our ion implantation range.

Inspection: what decides the grade

On an NV-6200 the grade usually comes down to three things.

Source and high voltage. We check filament and arc chamber wear, source magnet and extraction, then bring the high-voltage supplies up in steps and log arcing. Insulators that have tracked must be replaced before the tool can be graded above Inspected.

Vacuum. Many units still run their original oil-sealed roughing pumps and older cryopumps. We measure pump-down times and base pressure, regenerate the cryopumps and check compressor helium pressure.

Controls and interlocks. Logic boards from this era are the long-term risk. We test every interlock, from the high-voltage enclosure doors to the gas cabinet, and record which boards we would hold as spares.

Refurbishment and upgrades

A full refurbishment strips the source and beamline, decontaminates parts, renews insulators and consumables, and overhauls the vacuum system. Pumps are where most owners choose to upgrade. A dry pump conversion removes oil backstreaming risk and the cost of disposing of contaminated oil that has pumped dopant gases. Our post on converting oil-sealed pumps to dry pumps explains the sizing and exhaust questions.

Controls can be modernised in stages: vacuum sequencing and interlocks first, since those are safety-relevant, then data logging.

Spare parts strategy

For a tool of this age, plan spare parts before you need them. We help you build a list of critical spares, typically source consumables, insulators, gauges, a spare cryopump and the boards most likely to fail, and we tell you which items we can source quickly and which need a long lead time.

Facilities

Confirmed for each unit; values depend on configuration.

• Three-phase power for supplies, magnet and pumps
• Cooling water for source, magnet and compressors
• Compressed dry air and nitrogen
• Approved storage and delivery for dopant gases or solid sources, with gas detection
• Toxic and general exhaust
• Radiation and high-voltage safety measures agreed with your safety officer

Buying advice

Ask whether the tool was decommissioned with gas lines purged and whether its pumps were run on arsenic or phosphorus. Request any source rebuild logs. If the seller has no history, budget for a full decontamination and a vacuum overhaul, and treat the controls as the item that sets the long-term support plan.