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The graphite pre-mass-resolving slit is a precision beam-defining aperture installed in the early section of the AMAT XR80 ion implanter beamline, immediately ahead of the analysing (mass-resolving) magnet. Machined from high-purity, fine-grain graphite, this component sits in the divergent ion beam after extraction and shapes the beam envelope before it enters the analyser. Its defining edges set the angular and spatial acceptance of the beam that the downstream mass-resolving optics will subsequently sort by mass-to-charge ratio.
The “PRE-MRS” designation identifies this slit as the pre-mass-resolving-slit aperture, distinct from the final resolving slit that follows the analysing magnet. In this position the slit intercepts a broad, energetic, mixed-species ion stream emerging from the source extraction optics. It must trim the beam to a well-controlled width and divergence so that the analysing magnet can disperse the species cleanly across the resolving plane. Graphite is chosen here because it tolerates direct beam strike, sublimes rather than melts under localised heating, and does not introduce metallic contamination into the implant chemistry.
Because it directly contacts a high-current, high-energy ion beam in hard vacuum, this slit is a true consumable. Edge erosion, sputter redeposition and thermal cycling progressively change its effective aperture, which in turn degrades mass resolution, beam transmission and ultimately implant uniformity. Keeping a qualified replacement on the shelf is central to sustaining beamline tune stability and protecting wafer-level dose accuracy on XR80-class tools.
Within the XR80 beamline the pre-MRS slit performs several interlocking functions that together set the quality of the beam delivered to the wafer. It is small, passive and mechanically simple, yet it is one of the most influential apertures in the entire optical column.
The behaviour of this slit is governed almost entirely by its graphite substrate and the precision of its machined edges. Both must hold up to sustained beam strike while remaining dimensionally and chemically stable.
Fine-grain, high-purity graphite is the standard beam-contact material in AMAT source and beamline hardware because it combines a very high sublimation temperature with low sputter yield and minimal outgassing. It conducts heat away from the strike zone, withstands repeated thermal cycling without cracking under normal duty, and, critically, contributes only carbon to the residual gas and redeposition budget. Low ash content and tight grain structure keep particulate generation and metallic contamination to a minimum, which matters immediately upstream of the analysing magnet.
The optical performance of the slit depends on the accuracy and surface finish of its defining edges. The aperture width, edge straightness and alignment to the beam axis directly determine how cleanly the beam is trimmed and how reproducibly the analysing magnet can resolve adjacent mass peaks. A worn, rounded or eroded edge widens the effective aperture and blurs the beam object, degrading resolution even when the magnet and extraction are perfectly tuned.
As a beam-defining aperture, the condition of this slit propagates directly into the implant result. A slit that has drifted out of specification through erosion or redeposition undermines the very parameters that the implanter exists to control.
Because the slit lives in the beam, its failure modes are dominated by erosion, deposition and thermal effects rather than by mechanical or electrical fault.
Continuous strike by energetic ions slowly sputters and recesses the defining edges. Over time the aperture widens and the edges round over, blurring the beam object and softening mass resolution. This is the primary life-limiting mechanism and the usual reason a pre-MRS slit is scheduled for replacement.
Sputtered material and condensed source by-products can redeposit on and around the slit, partly occluding the aperture or creating flakes that later detach as particles. Asymmetric buildup skews the beam profile and can shift the tune, while liberated debris becomes a defectivity source downstream.
Repeated heating and cooling as beam conditions change imposes thermal cycling on the graphite. Under high beam loads or after prolonged service, micro-cracking, flaking or fracture at the strike zone can occur, abruptly changing the aperture geometry and forcing an unplanned slit change.
Replacement should follow the OEM service procedure for the specific XR80 beamline configuration and be carried out by trained personnel under appropriate vacuum, lockout and handling controls. The following sequence outlines a typical approach.
Beam-contact consumables such as the pre-MRS slit wear on a predictable cadence, so stocking qualified replacements is a straightforward way to protect uptime. ESCT Fab Support helps fabs and service teams keep XR80 beamlines productive without overcommitting to long OEM lead times.
It is a graphite aperture that trims the ion beam to a defined width and divergence before the beam enters the analysing magnet. By setting the beam object size and intercepting off-axis ions, it enables the magnet to cleanly separate species by mass-to-charge ratio.
No. This is supplied as a new, OEM-compatible replacement part for AMAT P/N 0020-85069, verified to form, fit and function. It is not an original OEM part and is not sold as one; it is offered as a compatible alternative for XR80-class beamlines.
Graphite withstands direct beam strike by sublimating instead of melting, has a low sputter yield, and contributes only carbon to the vacuum environment. A metallic slit in this position would risk introducing metal contamination into the implant and would tolerate beam heating far less gracefully.
Typical indicators include a gradual loss of mass resolution, drifting beam current or tune setpoints, increased particle counts, and difficulty re-qualifying dose uniformity. Visual inspection during maintenance windows will often reveal edge erosion, redeposition or cracking at the strike zone.
Yes. Because the slit defines the beam presented to the analyser, any replacement should be followed by source and analyser retuning and a qualification of mass resolution, beam current and dose uniformity before the tool returns to production.
The indicative lead time is approximately 2.5 weeks. Because this slit is a predictable wear item, we recommend holding stock or arranging a min/max replenishment arrangement so a qualified replacement is always available for planned preventive maintenance.
The graphite pre-mass-resolving slit (OEM P/N 0020-85069, ESCT P/N ES227-0551) is a small but critical beam-defining aperture in the AMAT XR80 ion implanter beamline. Sitting just ahead of the analysing magnet, it trims the extracted ion beam to a controlled width and divergence, intercepts off-axis ions and protects downstream optics, all while contributing only carbon to a contamination-sensitive vacuum environment. Because it wears through edge erosion, redeposition and thermal cycling, its condition directly governs mass resolution, beam stability and dose uniformity, making it a key consumable to keep on hand. ESCT Fab Support offers this component as a verified, OEM-compatible replacement with predictable lead times to keep XR80-class implanters running reliably.
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 0020-85069. 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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