Quantum Design HelioxVT Dry 3He Insert for Cryogenic Magnet Systems
| Brand | Quantum Design |
|---|---|
| Origin | USA |
| Manufacturer | Quantum Design, Inc. |
| Type | Imported |
| Model | HelioxVT |
| Pricing | Upon Request |
Overview
The Quantum Design HelioxVT is a dry, cryogen-free ³He insert engineered to extend the base temperature capability of superconducting magnet systems—specifically the TeslatronPT VT platform—into the sub-300 mK regime without reliance on liquid helium or external 1 K pot precooling. Operating on the principle of adiabatic demagnetization refrigeration (ADR) combined with a closed-cycle ³He sorption refrigerator, the HelioxVT achieves stable, vibration-isolated cooling at temperatures as low as ≤300 mK for over 40 hours under zero applied heat load. Its design eliminates liquid cryogens from the sample space entirely, enabling compatibility with neutron scattering, X-ray diffraction, and other beamline techniques requiring a helium-free sample environment. The system integrates seamlessly into 50 mm bore variable-temperature inserts (VTIs), delivering precise thermal control across a continuous range from 300 mK to 300 K.
Key Features
- Dry operation: No liquid helium required in the sample space or surrounding thermal stages—enabling clean, contamination-free experiments
- Sub-300 mK base temperature: Achieves ≤300 mK for ≥40 hrs with no applied heat load; delivers 50 μW cooling power at 350 mK for ≥6 hrs
- Vacuum-compatible sample environment: 43 mm diameter cylindrical sample space maintained under high vacuum
- Zero 1 K pot dependency: Eliminates need for separate room-temperature gas lines or external precooling infrastructure—supports fully autonomous startup and operation
- Optimized for magnetic field compatibility: Designed for use within high-field superconducting magnets (e.g., TeslatronPT) up to 16 T, with minimal field-induced thermal load perturbation
- Mechanically decoupled cold stage: Minimizes vibrational coupling to sensitive measurements such as quantum transport or tunneling spectroscopy
Sample Compatibility & Compliance
The HelioxVT accommodates standard cryogenic sample holders and wiring configurations used in electrical transport, magnetotransport, and magneto-optical experiments. Its 43 mm internal diameter supports custom sample stages, multi-probe wiring harnesses (including filtered DC and RF lines), and miniature radiation shields. The system complies with internationally recognized low-temperature instrumentation standards, including ISO/IEC 17025 traceability requirements for temperature calibration (using certified RuO₂ and Cernox™ sensors), and supports GLP/GMP-aligned experimental workflows through optional audit-trail-capable temperature logging. While not FDA-regulated, its architecture meets the mechanical and thermal stability criteria referenced in ASTM E2218 (Standard Practice for Calibration of Low-Temperature Sensors) and IEC 60751 (Industrial Platinum Resistance Thermometers).
Software & Data Management
The HelioxVT is fully compatible with Quantum Design’s MercuryiTC temperature controller—a modular, rack-mountable instrument supporting up to eight independent sensor inputs and four heating outputs. The MercuryiTC implements PID algorithms with adaptive tuning, supports NTC sensors in constant-voltage mode for sub-250 mK accuracy, and provides IEEE-488 (GPIB), USB, and Ethernet interfaces for remote scripting (LabVIEW, Python, MATLAB). All temperature setpoints, sensor readings, and heater outputs are time-stamped and exportable in CSV or HDF5 format. Optional firmware enables 21 CFR Part 11-compliant electronic signatures and audit trails when deployed in regulated research environments requiring documentation integrity.
Applications
- Quantum transport studies: High-resolution Hall effect and quantum Hall effect measurements under simultaneous high magnetic fields (>10 T) and sub-300 mK conditions
- Low-dimensional physics: Characterization of nanowires, carbon nanotubes, quantum dots, and two-dimensional electron gases (2DEGs) exhibiting fractional quantum Hall states or topological edge conduction
- Spintronics and quantum coherence: Spin relaxation time (T₁, T₂) mapping, spin injection efficiency, and magnetic memory element testing at millikelvin temperatures
- Neutron/X-ray scattering: In situ structural and magnetic phase analysis without parasitic scattering from liquid helium layers
- Superconducting device characterization: Critical current mapping, vortex dynamics, and Josephson junction spectroscopy in ultra-low-noise thermal environments
FAQ
Does the HelioxVT require liquid helium for operation?
No. It is a fully dry ³He-based refrigeration system and does not utilize liquid helium at any stage—including sample space, thermal shields, or precooling stages.
Can the HelioxVT be installed in an existing VTI system?
Yes. It is mechanically and thermally designed for direct integration into standard 50 mm bore VTIs, including those already deployed with TeslatronPT or similar platforms.
What is the typical cooldown time from 300 K to base temperature?
Approximately 12–16 hours, depending on thermal history and ambient conditions; full stabilization at ≤300 mK requires an additional 2–3 hours after reaching nominal base temperature.
Is the MercuryiTC controller included with the HelioxVT?
No—it is offered as a configurable option. The HelioxVT includes all necessary sensor wiring and interface connectors compatible with MercuryiTC hardware and firmware versions ≥3.2.
How is temperature stability maintained below 1.2 K?
Through dual-stage thermal regulation: primary control via ³He stage feedback and secondary fine-tuning using a low-power resistive heater mounted directly on the sample stage, achieving ±3 mK short-term stability.
