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The Graphite Cooled-Tube Shield (AMAT OEM P/N 0040-02238) is a precision-machined, high-purity graphite component that surrounds and protects the water- or fluid-cooled tube assembly within the ion source region of Applied Materials XR80-class ion implanters. In a high-current implant source, the cooled tube carries coolant to thermally manage hardware that sits close to the arc chamber and extraction optics, where temperatures and ion flux are extreme. The graphite shield acts as a sacrificial, thermally tolerant barrier between that cooled metalwork and the surrounding high-energy plasma environment.
Positioned in one of the most aggressive thermal and chemical zones of the beamline, this shield absorbs sputtering, radiant heat and ion bombardment that would otherwise erode or contaminate the cooled tube and adjacent source furniture. Because it is made from graphite rather than metal, it tolerates the elevated temperatures of the source area without melting, outgassing markedly, or introducing metallic contamination into the extracted beam. As the plasma chemistry shifts between dopant species, boron, phosphorus, arsenic and their associated source gases, the shield maintains the geometry and clearances that the cooled tube and the extraction region depend upon.
Like all graphite source consumables, this part is consumed gradually during normal operation. Maintaining a disciplined replacement cadence for the cooled-tube shield protects the far more expensive cooled tube assembly behind it and to keeping the source operating within its specified beam-current and beam-quality envelope.
Within the XR80 source assembly, the graphite cooled-tube shield performs several overlapping protective and process-stabilising functions. It is not a structural part in the load-bearing sense; rather, it is a thermal and contamination shield whose geometry is tuned to the source it serves. Its principal roles include:
The performance of this component is governed almost entirely by the grade and machining quality of the graphite from which it is made. In ion-implant source service, the material must survive thermal cycling, reactive plasma chemistry and continuous sputtering while keeping its contribution to beam contamination negligibly low.
High-purity, fine-grain graphite is selected for source furniture because it combines excellent thermal stability with very low metallic ash content. A clean, dense grain structure minimises the trace elements that could be sputtered into the beam and resists the micro-cracking that accelerates particle shedding.
The shield must withstand the combined radiant heat, plasma exposure and reactive halogen chemistry of the source without warping or chemically degrading at a rate that compromises the cooled tube. Its ability to dissipate and re-radiate heat is what keeps the protected metalwork within its design temperature.
Although it is a comparatively low-cost consumable, the condition of the graphite cooled-tube shield has a direct influence on source stability, beam purity and overall implant uptime. When the shield is worn, cracked or improperly fitted, the consequences propagate through the source and ultimately to the wafer:
Because it is a sacrificial graphite consumable, the cooled-tube shield is expected to wear; the engineering objective is to retire it before that wear endangers the cooled tube or the beam. The following are the typical failure signatures observed in service.
Continuous ion bombardment gradually erodes the graphite face, thinning the shield and enlarging clearances. Once material loss exposes the underlying cooled tube, the protective function is lost and contamination and thermal risk rise sharply.
Repeated thermal cycling and localised hot spots can initiate cracks in the graphite, leading to spalling and the release of carbon particulate. Flakes can redeposit on optics or fall into the source, undermining beam stability and cleanliness.
Reactive halogen chemistries accelerate surface recession, while redeposited dopant and source-material films build up on cooler areas of the shield. Both effects alter geometry and can bridge clearances, contributing to glitching and source instability.
Replacement of the graphite cooled-tube shield is normally carried out during scheduled source preventive maintenance, when the source is already vented and partially disassembled. Always follow the relevant AMAT service procedure and site safety requirements; the steps below are a general guide only.
Graphite source consumables such as the cooled-tube shield are best managed as planned, stocked spares rather than reactive purchases. Because they wear predictably and are replaced at every major source rebuild, holding qualified inventory protects uptime and smooths maintenance scheduling. ESCT Fab Support supplies this component with that strategy in mind:
It is a high-purity graphite barrier that protects the water- or fluid-cooled tube assembly in the XR80 ion source from sputter erosion, radiant heat and beam contamination. By taking the wear itself, it preserves the more expensive cooled tube and keeps source geometry and beam purity stable.
No. This shield is supplied as a new, OEM-compatible component verified to the form, fit and function of AMAT OEM P/N 0040-02238. It is not an original AMAT-branded part, but it is intended as a direct functional replacement for the original consumable.
As a sacrificial graphite consumable, it is typically replaced at scheduled source rebuilds. The exact interval depends on dopant species, beam current and duty cycle, so most fabs set a cadence based on their own erosion-monitoring and source-life data.
Continued use of a heavily eroded or cracked shield can expose the cooled tube to direct bombardment, introduce metallic contamination into the beam, increase particle counts and destabilise beam current. The result is reduced yield and the risk of damage migrating to costlier hardware.
High-purity graphite withstands the extreme source temperatures without melting, outgasses minimally and, critically, does not introduce metallic contamination into the dopant beam when sputtered. These properties make it the standard material choice for source furniture in high-current implant sources.
Graphite is brittle and porous, so the shield should be kept in clean, dry packaging until use and handled only with powder-free gloves. Avoid impacts, skin contact and exposure to moisture or oils, all of which can chip the part or introduce contamination into the source.
The Graphite Cooled-Tube Shield (AMAT OEM P/N 0040-02238, ESCT P/N ES227-0595) is a high-purity graphite consumable that protects the cooled tube assembly in AMAT XR80-class ion implant sources from sputtering, heat and contamination. By serving as a sacrificial barrier, it preserves expensive source hardware, maintains beam purity and supports stable, repeatable implant performance. Managed as a planned spare and replaced on a disciplined preventive-maintenance schedule, it offers an effective, low-cost way to protect source uptime and wafer yield. ESCT Fab Support supplies it verified to the original part’s form, fit and function, with competitive pricing and a typical 2.5-week lead time.
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 0040-02238. 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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