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The Pre-Acceleration Electrode Stack is the multi-electrode assembly that sits immediately downstream of the ion source extraction aperture on Applied Materials (AMAT) ion implantation platforms. Its job is to take the freshly extracted, low-energy ion beam emerging from the source plasma and impart the first, carefully shaped stage of acceleration before the beam enters the analyser magnet and the main acceleration column. The “stack” terminology reflects its physical construction: a series of precision metal electrodes, separated and supported by high-voltage insulators, stacked along the beam axis so that a graded electrostatic potential can be applied across successive gaps.
Within the source and beamline architecture of Quantum and xR-class tools, this assembly occupies one of the most electrically and thermally demanding positions in the entire system. It operates inside high vacuum, directly exposed to the ion beam, to sputtered source material and to the intense electric fields needed to draw ions out of the plasma meniscus and begin their journey down the beamline. The quality of the beam that every subsequent subsystem receives (the mass analyser, the post-acceleration optics and the end-station scanning) is largely determined by how cleanly and stably this first electrode stack extracts and pre-accelerates the ions.
Because the electrode stack defines the initial beam emittance, divergence and energy, its condition has an outsized effect on dose uniformity, beam current and implant repeatability. A worn, contaminated or electrically degraded stack is one of the most common root causes of unstable extraction, glitching and beam-current droop on these implanters, which is why a known-good replacement is a critical line item for any AMAT implant toolset.
The pre-acceleration electrode stack performs the electrostatic optics function that bridges the ion source and the analysed beamline. By holding each electrode at a precisely controlled potential, it shapes the field that extracts ions and accelerates them to an intermediate energy suited to mass analysis. Its principal functions include:
The defining electrical requirement of the stack is reliable high-voltage standoff between electrodes that may differ by tens of kilovolts across a few millimetres of vacuum gap. The insulators must hold off these potentials cleanly while the electrode surfaces remain smooth enough to avoid local field enhancement.
Electrically, the stack also behaves as an electrostatic lens. The relationship between electrode potentials and aperture geometry determines the focal properties of the extracted beam, which in turn governs how much usable current the tool can deliver to the wafer.
Because the pre-acceleration electrode stack defines the starting condition of the beam, its health propagates directly into process results at the wafer. Degradation here is rarely contained to a single subsystem; it shows up as drifting dose, marginal beam current and rising tool downtime. Typical consequences of a degraded or failing stack include:
The electrodes sit directly in the path of the ion beam and the source effluent, so their aperture edges erode over time while sputtered material redeposits elsewhere on the stack. This slowly changes aperture geometry and beam optics, and the conductive deposits can bridge insulators, degrading standoff and altering the field that the stack produces.
Contamination films, surface roughening and micro-particles all promote arcing across the high-voltage gaps. Once tracking marks form on an insulator, breakdown becomes progressively easier, producing the recurrent glitching that destabilises extraction and stresses the power supplies. Severe or repeated arcing can permanently carbonise the insulator surface.
Beam interception and radiant heat from the source cycle the electrodes through large temperature swings. Repeated thermal expansion can warp electrodes, loosen fasteners and shift inter-electrode spacing, while mechanical misalignment of the apertures relative to the beam axis introduces aberrations, beam clipping and localised heating.
The electrode stack lives inside the high-voltage source terminal and is exposed to lethal potentials and high vacuum, so replacement must follow the AMAT-prescribed lockout and safety procedure for the source and extraction subsystem. The following sequence outlines the general workflow; always defer to the tool’s service documentation and site safety rules.
The pre-acceleration electrode stack is a consumable-class, high-wear assembly, which makes it a prime candidate for proactive stocking rather than reactive ordering. Holding a verified spare lets a fab swap a degraded stack during a planned source preventive-maintenance window instead of waiting on procurement during an unplanned beam-quality excursion. ESCT Fab Support offers several advantages for sourcing this part:
It extracts ions from the source plasma and applies the first stage of acceleration, shaping the beam optics before the beam reaches the analyser magnet. In effect it sets the starting energy, current and emittance of the entire beamline.
No. This is an OEM-compatible replacement supplied by ESCT Fab Support, cross-referenced to AMAT OEM P/N 0090-90388 and verified to match the original in form, fit and function. It is not an original AMAT part and is not sold as one.
Typical indicators are rising high-voltage glitch rates, falling or unstable beam current, increasing difficulty holding dose uniformity, and visible erosion or heavy deposition during source maintenance. Many fabs replace it on a scheduled interval tied to source PM cycles.
It is used in the source and extraction subsystem of Applied Materials Quantum and xR-class ion implantation platforms. Confirm applicability for your specific tool by matching against AMAT P/N 0090-90388 and your machine configuration.
Yes. After installation the stack must be high-voltage conditioned, extraction and suppression voltages re-tuned, and beam current, profile and stability verified before the tool is released to production, in line with your qualification procedures.
For most implant toolsets, yes. As a high-wear, beam-facing assembly whose condition directly affects yield, it is well suited to buffer stocking so a degraded stack can be replaced during planned maintenance rather than during an unexpected excursion.
The Pre-Acceleration Electrode Stack (AMAT OEM P/N 0090-90388, ESCT P/N ES3033-120) is the beam-facing electrostatic optics assembly that extracts and pre-accelerates the ion beam on AMAT Quantum and xR-class implanters. Its condition governs beam current, dose uniformity and high-voltage stability across the whole beamline, and as a high-wear consumable it benefits from proactive stocking. ESCT Fab Support supplies a verified, cost-effective replacement to keep these implanters running with minimal 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 0090-90388. 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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