0020-89586
CATHODE, LINER END, SOURCE, DIA 16, 0020-89586

Source liner end cathode, 16 mm diameter (OEM P/N 0020-89586), arc-chamber liner termination for AMAT ion implanter source systems

ESCT P/N ES227-0091 · AMAT-compatible source liner end cathode for XR80/9500-class implant beamlines

The Source Liner End Cathode (AMAT OEM P/N 0020-89586) is a high-purity, refractory termination component fitted at the end of the source liner inside the indirectly heated cathode (IHC) arc chamber of Applied Materials ion implanters. Within the source assembly, the liner is the sacrificial inner wall that shields the arc-chamber body from the corrosive plasma and ion bombardment generated when feed gases such as boron trifluoride, phosphine, arsine or argon are ionised. This 16 mm diameter end piece closes out and locates the liner at the cathode side of the chamber, defining the boundary where the electron-emitting cathode meets the ionisation volume.

In an IHC source, a heated filament drives a cathode to thermionic emission temperatures, and the liberated electrons are accelerated into the gas to strike and sustain the arc discharge. The liner end sits in the most thermally and chemically aggressive region of the entire ion source, immediately adjacent to the white-hot cathode, bathed in dense plasma, and subject to continuous sputtering by energetic ions. Its geometry, purity and dimensional stability directly govern how cleanly the arc strikes and how reproducibly the source delivers beam current.

Because the part is a defined consumable in a high-vacuum, high-temperature environment, it must hold tight tolerance on the 16 mm bore and seating features despite repeated thermal cycling between ambient and well over 1000°C. A worn, eroded or contaminated liner end is one of the most common limiters of source lifetime, beam stability and overall implant tool uptime, which is why it is stocked as a frequently replaced spare.

Functional role of the source liner end cathode in AMAT ion implanter platforms

The liner end cathode performs several interlocking jobs at the cathode boundary of the arc chamber, balancing electrical, thermal and plasma-confinement duties simultaneously:

• Terminates and locates the source liner at the cathode end, maintaining the defined plasma volume and the gap geometry between cathode and chamber walls.
• Provides a sacrificial, replaceable surface that absorbs ion sputtering and chemical attack so the more expensive arc-chamber body is protected.
• Maintains the 16 mm diameter aperture or seating bore that conditions electron entry from the cathode region and shapes the local field at the discharge boundary.
• Confines reactive species and conducts heat away from the cathode hot zone, helping stabilise arc-chamber temperature and pressure.
• Supports a consistent work function and contamination profile at the cathode boundary, which underpins repeatable arc striking and beam current.
• Acts as a controlled, low-cost wear item that allows source rebuilds on a predictable preventive-maintenance interval.

Material and process performance

High-purity refractory construction

Liner-end and cathode-region components in AMAT sources are manufactured from high-purity refractory materials, typically fine-grain graphite, molybdenum or tungsten depending on the source variant, chosen for their ability to survive sustained operation at extreme temperature without melting, outgassing or shedding particulate.

• High melting point and dimensional stability across rapid thermal cycling near the cathode.
• Low outgassing and controlled impurity content to protect base vacuum and avoid implant contamination.
• Resistance to chemical attack from halide-bearing dopant gases and their dissociation products.
• Fine-grain microstructure that erodes evenly rather than spalling into the plasma.

Plasma and sputter tolerance

The end piece is positioned where ion-energy density and sputter rates peak, so its process performance is judged primarily by how slowly and how predictably it erodes while holding the 16 mm bore within tolerance.

• Predictable, uniform sputter wear that supports stable beam current over the source service interval.
• Minimal redeposition of sputtered material that could short the cathode or form flakes.
• Stable surface chemistry so the cathode work function and arc behaviour do not drift mid-campaign.
• Clean machining of seating and aperture features so plasma confinement remains symmetric.

Impact on tool performance and yield

Although it is a small consumable, the condition of the liner end cathode propagates directly into beam quality, dose accuracy and the productivity of the implant tool:

• Stable arc striking and beam current, which keeps dose uniformity within wafer specification.
• Lower particle generation, reducing defect counts and contamination-related yield loss.
• Longer, more predictable source lifetime between scheduled rebuilds and fewer unplanned source crashes.
• Consistent glitch and arc-fault rates, minimising beam interruptions during recipe runs.
• Reduced mean time to repair, because a known-good spare allows a fast, planned liner swap during preventive maintenance.

Common wear and failure modes

Sputter erosion and bore enlargement

Continuous ion bombardment slowly removes material from the working face and the 16 mm bore. As the geometry opens up, plasma confinement weakens, the arc becomes less stable, and beam current can drift or become difficult to tune, the classic end-of-life signature for this component.

Deposition, bridging and shorting

Sputtered metal and decomposed dopant residues can redeposit around the cathode boundary, forming conductive bridges or flakes. These cause intermittent shorts, increased arc glitching and, in the worst case, a hard short that collapses the discharge and forces an unscheduled source change.

Thermal cracking and distortion

Repeated heating and cooling near the cathode hot zone stresses the refractory body. Microcracking, warping or chipping degrades the seating fit and confinement geometry, releases particulate into the chamber and accelerates the failure of neighbouring source parts.

Installation and replacement guidance

The liner end cathode is replaced during a planned source rebuild. Follow site safety procedures throughout, treating used parts as potentially carrying toxic dopant residues such as arsenic and antimony:

• Vent the source, isolate gas and power, and allow the arc chamber to cool fully before opening; observe lockout/tagout and dopant-handling protocols.
• Remove the source insert and withdraw the liner assembly, recording orientation and the condition of mating parts for wear tracking.
• Detach the worn liner end, then clean the seating area and remove any redeposited material or flakes from the cathode region.
• Handle the new part only with clean, lint-free gloves to avoid transferring contaminants that could outgas or alter the work function.
• Fit the replacement liner end, confirm the 16 mm bore is concentric and the seating is square, and verify clearance to the cathode and filament.
• Reassemble the source, pump down and leak-check, then bake or condition the source per the tool procedure before production.
• Run source characterisation, confirm stable arc striking and beam current, and log the change to reset the preventive-maintenance counter.

Spare parts strategy for AMAT ion implanter sources

Because liner-end cathodes are consumed on a predictable cycle, holding qualified spares on the shelf protects implant-tool availability. ESCT Fab Support supplies this component as a cost-effective, qualified alternative to single-source OEM procurement:

• Verified to the form, fit and function of AMAT OEM P/N 0020-89586, referenced under ESCT P/N ES227-0091.
• Short, dependable lead time of around 2.5 weeks to support planned source rebuilds.
• High-purity refractory construction matched to the demands of the IHC arc-chamber environment.
• A competitively priced consumable that reduces the per-rebuild cost of source maintenance.
• Knowledgeable support for AMAT source and beamline hardware to help confirm fit for your configuration.

Frequently asked questions

What does the source liner end cathode actually do?

It terminates and locates the source liner at the cathode end of the AMAT arc chamber, providing a sacrificial, high-purity surface that protects the chamber body, confines the plasma and maintains the 16 mm bore geometry that conditions electron entry and arc stability.

Is this an original AMAT OEM part?

No. This is supplied as a new, OEM-compatible part that is verified to the form, fit and function of AMAT P/N 0020-89586. It is not an original OEM part and is not sold as an Applied Materials branded item; AMAT part numbers are quoted purely for identification and compatibility reference.

How do I know when it needs replacing?

Typical indicators are difficulty striking or holding the arc, drifting or unstable beam current, rising arc-glitch rates, increased particle counts, or a bore that has visibly eroded beyond tolerance. Most sites replace it on a scheduled basis as part of the routine source rebuild interval.

What material is it made from?

It is produced from high-purity refractory material, commonly fine-grain graphite or a refractory metal such as molybdenum or tungsten depending on the source variant, selected for high-temperature stability, low outgassing and predictable, uniform sputter wear.

What is the lead time for this part?

The typical lead time is approximately 2.5 weeks. Because this is a routinely consumed source part, we recommend keeping spares on hand so a worn liner end never delays a planned preventive-maintenance source rebuild.

Are there safety precautions when removing the used part?

Yes. Used source components can carry hazardous dopant residues including arsenic, phosphorus and antimony compounds. Handle them using your facility’s toxic-material procedures, appropriate personal protective equipment and controlled disposal, and confirm the source is fully cooled and de-energised before service.

Summary

The Source Liner End Cathode (AMAT OEM P/N 0020-89586, ESCT P/N ES227-0091) is a 16 mm diameter, high-purity refractory termination that closes out the source liner at the cathode end of the AMAT ion implanter arc chamber. It protects the chamber body, confines the plasma and maintains the bore geometry that underpins stable arc striking, repeatable beam current and clean dose delivery. As a predictable consumable subject to sputter erosion, redeposition and thermal stress, it is best managed through planned replacement supported by qualified spares. ESCT Fab Support offers it on a short 2.5-week lead time as a cost-effective, verified alternative for AMAT source and beamline maintenance.

Disclaimer: This part is supplied by ESCT Fab Support as a new, OEM-compatible second-source component, verified to the form, fit and function of Applied Materials part number 0020-89586. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Applied Materials, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.

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