KRI RFICP 200 HO Gridded Radio-Frequency Inductive Ion Source

Overview

The KRI RFICP 200 HO is a large-area, gridded radio-frequency inductive ion source engineered for high-flux, low-energy ion beam generation in demanding thin-film and surface engineering applications. Unlike thermionic or DC discharge sources, the RFICP 200 HO employs inductively coupled plasma (ICP) excitation—eliminating filaments and cathodes—to sustain stable, long-life plasma operation under ultra-high vacuum (UHV) conditions. Its gridded extraction architecture leverages the OptiBeam™ ion optics system to deliver precise control over beam energy (typically 10–1000 eV), current density (>1 mA/cm² at 500 eV), and spatial uniformity across substrates up to 300 mm diameter. The source is specifically optimized for processes requiring high ion flux at energies below 1 keV, including ion-assisted deposition (IAD), reactive ion beam etching (RIBE), surface cleaning, and pre-treatment of optical coatings and semiconductor wafers.

Key Features

• Filamentless RF inductive plasma generation ensures exceptional operational stability and extended maintenance intervals—critical for 24/7 production environments.
• OptiBeam™ grid assembly provides self-aligned, application-specific ion optics with adjustable beam divergence, enabling collimated, convergent, or divergent output configurations without manual realignment.
• Integrated water-cooled housing maintains thermal equilibrium during sustained >1 kW RF power operation, preserving grid geometry and beam consistency over extended duty cycles.
• Modular neutralizer option (electron emitter) suppresses beam space charge effects, ensuring stable beam transport and uniform current distribution across large-area substrates.
• Compact RFICP Ion Power Pack controller delivers regulated RF power with real-time impedance matching, arc detection, and interlock integration compliant with SEMI S2/S8 safety standards.
• Designed for integration into UHV-compatible systems (base pressure ≤1×10⁻⁷ Torr), compatible with standard CF-150 and ISO-K 250 flanges.

Sample Compatibility & Compliance

The RFICP 200 HO supports processing of diverse substrate materials—including fused silica, sapphire, silicon wafers (200 mm and 300 mm), metallic mirrors, and polymer films—without thermal damage or charging artifacts. Its low-energy, high-current-density beam enables non-sputtering surface activation prior to PVD or ALD, as well as gentle, anisotropic etching of dielectrics (SiO₂, Si₃N₄) and compound semiconductors (GaN, InP). The source meets mechanical and electrical requirements for ISO 9001-certified manufacturing environments and supports GLP-compliant process documentation when paired with KRI’s optional digital I/O interface and timestamped log export. It is routinely deployed in systems qualified per ASTM F2627 (standard guide for ion beam processing of optical thin films) and aligns with USP recommendations for surface modification of medical device substrates.

Software & Data Management

Operation is managed via the RFICP Ion Power Pack controller, which features RS-485 and Ethernet (TCP/IP) interfaces for integration into centralized SCADA or MES platforms. All critical parameters—including forward/reflected RF power, grid voltages, neutralizer emission current, and coolant flow status—are logged with millisecond-resolution timestamps. Audit trails comply with FDA 21 CFR Part 11 requirements when used with validated third-party data acquisition software. Optional LabVIEW and Python SDKs enable custom automation of beam ramping sequences, multi-step energy sweeps, and closed-loop dose control based on in-situ Faraday cup feedback.

Applications

• Ion-assisted electron-beam evaporation (IAD-Evap) of high-laser-damage-threshold optical coatings (e.g., TiO₂/SiO₂ multilayers).
• Low-damage ion beam etching (IBE) of photomasks and EUV collector optics with sub-5 nm root-mean-square roughness retention.
• Surface functionalization of biomedical implants (Ti-6Al-4V, PEEK) to enhance protein adsorption and osseointegration.
• In-situ ion cleaning of wafer surfaces prior to epitaxial growth in MBE or MOCVD tools.
• Ion beam figuring (IBF) pre-polish correction for astronomical mirror substrates (Zerodur®, ULE®).

FAQ

What vacuum level is required for optimal operation of the RFICP 200 HO?
The source requires a base pressure ≤1×10⁻⁷ Torr and operates stably in the 1×10⁻⁶ to 5×10⁻⁵ Torr range during argon or oxygen plasma discharge.
Can the beam energy be dynamically varied during a single process run?
Yes—grid potentials are independently controlled via analog voltage inputs (0–10 V), enabling real-time energy modulation from 20 eV to 1000 eV with ±2 eV repeatability.
Is the RFICP 200 HO compatible with reactive gas chemistries such as O₂, N₂, or CF₄?
Yes—the all-stainless-steel, water-cooled construction and filamentless design support stable operation with oxidizing and corrosive gases; quartz or alumina plasma chambers are recommended for extended CF₄ use.
How is beam uniformity quantified and verified?
Uniformity is characterized using a 100-mm-diameter Faraday cup array; typical measured values are ±3.5% across Ø200 mm and ±5.2% across Ø300 mm at 500 eV and 15 mA total beam current.
Does KRI provide installation qualification (IQ) and operational qualification (OQ) documentation?
Yes—factory-verified IQ/OQ protocols, including grid alignment verification, beam profile mapping, and RF impedance calibration reports, are supplied with each unit upon request.