Physiké Acryo-4K Standard Sample-Exchange Cryostat

Overview

The Physiké Acryo-4K Standard Sample-Exchange Cryostat is a high-performance, modular closed-cycle cryogenic system engineered for precision low-temperature experiments requiring stable 4 K operation and flexible sample access. Based on either Gifford-McMahon (GM) or pulse-tube refrigeration technology, the Acryo-4K delivers continuous cooling without liquid cryogens while maintaining ultra-low base temperatures, minimal mechanical vibration, and compatibility with demanding experimental environments—including ultra-high vacuum (UHV), high magnetic fields, and optical/microwave signal transmission. Its core architecture features a dual-stage cold head, thermally anchored sample stage, and a vertically oriented exchange-gas chamber enabling rapid, repeatable sample insertion without breaking vacuum. The system operates via helium exchange gas conduction to the sample stage, ensuring thermal stability and reproducibility across temperature sweeps from <4 K up to 500 K or 800 K when equipped with optional high-temperature stages.

Key Features

• Standard UHV-compatible vacuum sample environment with base pressure <1×10⁻⁸ mbar (with appropriate pumping)
• Modular cold head options: GM-type or valve-separated pulse-tube configurations, both optimized for low-vibration performance
• Integrated vibration mitigation: cold-head suspension mounts, flexible bellows, helium exchange gas damping chamber, and optional sand-damped isolation base
• Customizable sample space geometry: from ultra-compact (e.g., 150 mm internal diameter)
• Multi-port feedthrough compatibility: including SMA, K, V, BNC, triax-BNC, multi-pin electrical, single-mode/multi-mode optical fiber, and gas inlet/outlet lines
• Optical access with configurable window materials: Be (for X-ray), V (soft X-ray), Mylar/Kapton (IR/THz), fused silica (UV–Vis), ZnSe (mid-IR), and sapphire (broadband IR)
• Dedicated sample mounting platforms: PUCK-style carriers, LCC/DIP sockets, optical transmission holders, probe-based fixtures, thermal transport stages, dielectric test platforms, and calorimetry-specific inserts

Sample Compatibility & Compliance

The Acryo-4K supports diverse physical measurement modalities under cryogenic conditions, including DC/AC transport, Hall effect, magnetotransport, photoluminescence (PL), cathodoluminescence (CL), Fourier-transform infrared (FTIR) spectroscopy, time-resolved fluorescence, terahertz time-domain spectroscopy (THz-TDS), neutron scattering sample environments, dilution thermometry (DLTS), X-ray diffraction (XRD), high-pressure diamond anvil cell (DAC) integration, matrix isolation spectroscopy, ion trapping, cold molecule manipulation, and quantum device characterization (SQUIDs, TES bolometers, superconducting qubits). All vacuum components comply with ISO-KF and CF flange standards; UHV-compatible variants meet ASTM E595 outgassing requirements. Optional electromagnetic shielding enclosures and RF-tight feedthroughs support GLP-compliant quantum measurement workflows subject to audit under ISO/IEC 17025.

Software & Data Management

The Acryo-4K integrates with industry-standard temperature controllers (e.g., Lakeshore 336, 372, or BlueFors QuTools) via IEEE-488 (GPIB), RS-232, or Ethernet interfaces. LabVIEW, Python (PyVISA), and MATLAB drivers are provided for automated temperature ramping, PID parameter optimization, and synchronized data acquisition with external instruments (e.g., Horiba QuantaMaster 8000, Fluorolog-3, Keysight B1500A). Full audit trail logging—including setpoint history, heater power, sensor readings, and valve actuation timestamps—is enabled in compliance with FDA 21 CFR Part 11 when paired with validated controller firmware and secure user authentication protocols.

Applications

• Low-temperature photoluminescence and electroluminescence of semiconductors, perovskites, and 2D materials
• Magnetooptical Kerr effect (MOKE) and Faraday rotation measurements in thin-film heterostructures
• THz imaging and spectroscopy of superconductors and topological insulators
• Ultra-low-noise microwave amplification using HEMT or Josephson parametric amplifiers
• Single-photon detector characterization (SNSPD, TES) under dark-count-limited conditions
• In-situ FTIR and Raman spectroscopy of catalytic surfaces and molecular adsorbates
• Cryogenic dielectric spectroscopy and impedance analysis of ferroelectric and relaxor materials
• High-field transport studies in pulsed magnets coupled via extended cold-finger configurations

FAQ

What refrigeration technologies are supported by the Acryo-4K platform?

The system accommodates both Gifford-McMahon and pulse-tube cold heads, with valve-separated pulse-tube variants recommended for lowest vibration and highest cooling power at 4 K.
Can the Acryo-4K be integrated with commercial fluorescence spectrometers?

Yes—standard optical coupling interfaces exist for Horiba QuantaMaster 8000, Fluorolog-3, and Edinburgh Instruments FLS1000 systems, including top-mounted quartz or sapphire windows and kinematic alignment fixtures.
Is UHV compatibility standard or optional?

UHV compatibility is standard on all Acryo-4K configurations; chambers are baked to 150 °C and qualified to ≤1×10⁻⁹ mbar with ion pump backing.
What level of vibration attenuation is achieved with the low-vibration option?

RMS displacement at the sample stage is reduced to <5 nm below 100 Hz when using full suspension, helium damping, and sand-isolation base—validated via laser Doppler vibrometry per ISO 20816-1.
Are custom electrical or optical feedthroughs available?

Yes—custom configurations include 16-channel RF-tight SMA feedthroughs, hermetic fiber arrays, and high-current (<5 A) superconducting leads for magnetotransport applications.