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The Post Accel Stack is the post-acceleration electrode assembly that sits in the high-voltage region of an Applied Materials (AMAT) ion implanter beamline, downstream of the analyser magnet and immediately ahead of the beam transport into the end station. It is a layered structure of metallic electrodes interleaved with insulating spacers, arranged so that a graded electrostatic potential can be applied across a controlled physical gap. The ion beam, already mass-selected by the analysing magnet, passes through the aperture of each electrode in turn and is accelerated, or in deceleration recipes, retarded, to its final implant energy before it reaches the wafer.
In the Quantum and xR-class platforms, energy precision is everything: the depth and profile of an implant are set by the kinetic energy with which ions strike the silicon. The post accel stack is one of the principal energy-defining elements in the beamline, so its mechanical alignment, surface condition and high-voltage integrity translate directly into dose uniformity, junction depth control and particle performance. A stack that is contaminated, cracked or arcing will compromise the very recipe accuracy the implanter exists to deliver.
Because it operates under hard vacuum, at elevated potential and in the path of an energetic ion beam, the Post Accel Stack is a maintenance-heavy assembly. ESCT Fab Support supplies it under part number ES3033-118 as a form, fit and function match to AMAT OEM P/N 0090-90352, helping fabs keep implant tools in production without holding excessive original-equipment inventory.
The post accel stack converts a high-voltage supply into a precisely shaped accelerating field across the beam path. Each electrode is held at a defined potential, and the insulator stack between them maintains that voltage gradient while preventing tracking and breakdown. Its core functions in the beamline include:
The defining electrical duty of the stack is to hold a large potential difference across a small vacuum gap without arcing. The insulators must present a long surface-creepage path and remain free of conductive contamination, while the electrodes must maintain clean, smooth, burr-free surfaces so that field enhancement at sharp points does not trigger breakdown. Stable standoff keeps the energy reference quiet and the beam well behaved.
The voltage applied across the stack directly determines the energy gained by the ions, so the assembly must deliver a reproducible field with low ripple and minimal drift. Any instability, from intermittent arcing, charging of contaminated surfaces or mechanical movement, appears as energy spread in the implanted profile. A clean, correctly assembled stack underpins consistent junction depth and tight dose control.
As an energy-defining element in the beamline, the post accel stack sits on the critical path between raw beam and finished implant. Its condition is felt across throughput, recipe accuracy and defectivity:
The most disruptive failure is loss of high-voltage standoff. Conductive films deposited on insulator surfaces, moisture from a vent, or field enhancement at a damaged electrode edge can initiate arcing. Repeated discharges leave carbonised tracking paths across the ceramic that lower the breakdown threshold further, producing a self-worsening cycle of beam trips until the stack is cleaned or replaced.
The energetic beam continuously sputters material from electrode aperture edges. Over time this enlarges and roughens the apertures, degrading beam shaping, and redistributes conductive material onto surrounding insulators and surfaces. The eroded geometry alters the local field, while the sputtered coating undermines the very isolation the stack depends upon.
Ceramic insulators are brittle and intolerant of thermal cycling, mechanical shock and over-torqued fasteners. A hairline crack can compromise high-voltage integrity even when it is not visible during a quick inspection. Loosened or unevenly torqued hardware lets electrodes shift, throwing aperture concentricity off and disturbing both beam alignment and the field profile.
The post accel stack is replaced during scheduled beamline preventive maintenance or in response to persistent high-voltage faults. Because it lives in a high-voltage, high-vacuum environment, so keep it clean and work methodically. A typical replacement sequence is:
Energy-defining beamline hardware like the post accel stack is exactly the kind of part that should be on the shelf before it fails, because an arcing stack can hold a high-value implant tool out of production for an entire shift. Sourcing ES3033-118 through ESCT Fab Support gives fabs a practical alternative to single-source original-equipment dependence:
It is the post-acceleration electrode and insulator assembly that applies a graded high-voltage field to the mass-selected ion beam, setting its final implant energy before the beam reaches the wafer. The electrodes shape and accelerate the beam while the insulators hold the voltage gradient across the gap.
No. ES3033-118 is supplied as an OEM-compatible part that is verified to the form, fit and function of Applied Materials OEM P/N 0090-90352. It is not an original Applied Materials branded component, and ESCT Fab Support is an independent supplier of replacement parts.
The usual indicators are a rising high-voltage arc rate, repeated beam trips, difficulty holding the conditioning voltage, energy instability in the implant profile, or visible tracking, cracking and heavy sputter deposits found during PM inspection.
Light deposits can sometimes be cleaned during PM, but once insulators show arc tracking or cracks, or electrodes are markedly eroded, cleaning will not restore reliable high-voltage standoff. At that point replacement is the dependable route back to specification.
Because the stack defines implant energy, any instability or misalignment shifts junction depth and dose, moving device parametrics off target. Eroded electrodes and flaking deposits also generate particles that land on wafers, directly raising defectivity.
Treat the ceramic insulators as fragile, keep every surface free of fingerprints and particles, torque fasteners evenly to specification, confirm aperture alignment, and always perform a controlled high-voltage conditioning ramp after pump-down before returning the tool to production.
The Post Accel Stack (AMAT OEM P/N 0090-90352) is the post-acceleration electrode and insulator assembly that sets final ion energy in the beamline of Applied Materials Quantum and xR-class implanters. Its high-voltage standoff, clean electrode geometry and precise aperture alignment determine implant energy accuracy, beam transmission and particle performance, making it a part whose condition is felt directly in yield. Common failures include high-voltage breakdown and arc tracking, electrode erosion with sputter contamination, and insulator cracking or misalignment, all of which warrant timely replacement. ESCT Fab Support offers this assembly as ES3033-118, verified to the original part’s form, fit and function, so fabs can stock ahead of failure and minimise costly implanter downtime.
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 0090-90352. 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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