KRI Kaufman KDC 75 Compact Grid Ion Source

Overview

The KRI Kaufman KDC 75 Compact Grid Ion Source is a high-reliability, DC magnetically confined ion source engineered for precision physical vapor deposition (PVD), ion beam assisted deposition (IBAD), ion beam sputtering (IBS), and low-damage ion etching (IBE) in medium- to small-volume vacuum chambers. Based on the classic Kaufman-type discharge geometry, it employs thermionic electron emission from dual tungsten or thoriated tungsten filaments, sustained within a magnetic field that enhances plasma density and ion extraction efficiency. Ions are extracted through a precisely aligned, water-cooled three-grid system — featuring an OptiBeam™ self-aligning grid assembly with a 7.5 cm aperture — enabling stable, collimated ion beams up to 14 cm in diameter at the target plane. Designed for integration into UHV systems down to 5×10⁻¹⁰ Torr, the KDC 75 delivers reproducible beam parameters across extended operational cycles, making it suitable for R&D labs and pilot-scale thin-film manufacturing where process repeatability and beam stability are critical.

Key Features

• Dual-cathode architecture with automatic filament redundancy switching — ensures uninterrupted operation during filament degradation or failure
• OptiBeam™ grid system with integrated self-alignment mechanism — minimizes beam divergence and maintains consistent ion optics over time
• Wide, continuously adjustable ion energy range (100–1200 eV) with high-voltage stability (<±0.5% ripple) for controlled sputter yield and subsurface damage management
• High-current capability (>250 mA at 1000 eV in Ar) with low-energy spread — supports both high-rate sputtering and gentle surface activation
• Modular neutralizer compatibility (standard filament, Sidewinder, or LFN-2000) — enables optimal space-charge compensation across varying chamber pressures and beam currents
• Compact mechanical footprint (7.9″ H × 5.5″ D) with 8″ CF flange interface — simplifies integration into existing coating platforms and custom UHV systems
• Support for multi-gas delivery (up to four independently controlled process gases) with optional automated mass flow controller integration

Sample Compatibility & Compliance

The KDC 75 is compatible with a broad spectrum of substrate materials including metals (Al, Cu, Ti, Ni alloys), dielectrics (SiO₂, Al₂O₃, MgF₂), semiconductors (Si, GaAs, SiC), and polymers (when used with low-energy, charge-compensated beams). It operates effectively with inert gases (Ar, Kr, Xe), reactive species (O₂, N₂, CH₄, Cl₂), and gas mixtures — enabling oxide, nitride, carbide, and fluorinated film synthesis. The source meets standard UHV-compatible material specifications (oxygen-free copper grids, stainless-steel housing, all-metal seals) and conforms to ASTM F1430 (Standard Practice for Ion Beam Etching of Semiconductor Devices) and ISO 14644-1 Class 4 cleanroom handling protocols. When paired with compliant power supplies and neutralizers, it supports GLP/GMP traceability requirements via external analog/digital I/O for audit-ready parameter logging.

Software & Data Management

While the KDC 75 operates natively via analog voltage inputs (0–10 V) for beam voltage, current, and gas flow setpoints, it is fully compatible with industry-standard vacuum automation platforms including MKS Instruments’ Intellitronix, Pfeiffer Vacuum’s HiCube Control, and custom LabVIEW- or Python-based SCADA systems. Optional KSC-1212 or KSC-1202 controllers provide local digital readout, ramp profiling, interlock monitoring, and RS-232/RS-485 communication. All operational parameters — including filament emission current, discharge voltage, extracted ion current, neutralizer bias, and gas valve status — can be logged with timestamped resolution for FDA 21 CFR Part 11-compliant electronic records when integrated with validated data acquisition software.

Applications

• Ion Beam Assisted Deposition (IBAD) of optical coatings (anti-reflective, high-reflection, filter stacks) with real-time densification control
• Sputter deposition of low-stress, high-adhesion metallic and compound films for MEMS, sensors, and photovoltaic electrodes
• Pre-deposition surface cleaning and activation prior to evaporation or sputtering — reducing interfacial contamination and improving nucleation uniformity
• Low-kiloelectronvolt ion etching (IBE) of delicate structures in semiconductor prototyping and mask repair
• Growth of multilayer interference coatings requiring sub-nanometer thickness control and interfacial sharpness
• In-situ ion polishing of X-ray mirror substrates and synchrotron optics

FAQ

What vacuum level is required for stable KDC 75 operation?
Stable operation is achieved at base pressures ≤5×10⁻⁶ Torr; optimal performance for high-current, low-energy applications requires ≤1×10⁻⁷ Torr. For ultra-high-vacuum IBE systems (e.g., 5×10⁻¹⁰ Torr), differential pumping or cryoshrouding may be recommended.
Can the KDC 75 be operated with oxygen or chlorine without filament oxidation?
Yes — when using reactive gases, filament lifetime is extended by employing pulsed operation, reduced discharge current, and/or alternative cathode materials (e.g., LFN-2000 lanthanum hexaboride neutralizer). Chamber conditioning and gas purity (≤1 ppm H₂O/O₂) are critical.
Is remote computer control supported out of the box?
No native Ethernet or USB interface is included; however, full remote control is enabled via analog I/O integration with third-party PLCs or DAQ systems, or by adding the KSC-1212 digital controller with RS-485 output.
What maintenance intervals are recommended for the grid assembly?
Grid inspection and cleaning are advised every 200–500 operating hours depending on process gas chemistry and beam current. Water-cooling lines should be flushed quarterly; filament replacement frequency varies from 100–1000 hours based on emission load and gas environment.
Does KRI provide application-specific beam calibration reports?
Yes — upon request, KRI issues NIST-traceable beam profile maps (Faraday cup scans), energy distribution measurements (retarding field analyzer data), and gas-species-dependent sputter yield curves for qualified users under confidentiality agreement.