Electronic and magnetic properties: Cryogen-Free Dilution Refrigerator (LD400)

What is it?

Cryogen-Free Dilution Refrigerator

Manufacturer

Bluefors

Model Name

LD400

Applications

• Ultra-low temperature quantum experiments. • Quantum device characterization both DC and RF. • Optical experiments at cryogenic temperatures. • Magneto transport measurements with 3D vector magnetic field capability

Instrument Overview

The Bluefors LD400 with Optical Access is a state-of-the-art cryogen-free dilution refrigerator system capable of achieving base temperatures around 8 mK. It supports both electrical and optical access, making it versatile for hybrid quantum experiments. Designed for high-performance and low-vibration environments, this system enables advanced research in quantum computing and low-temperature physics.

Technical features and specifications

Base Temperature: ~8 mK. Cooling Technology: Cryogen-free operation using a pulse tube cooler for precooling stages (50K and 4K). Final cooling stage achieved using a ³He/⁴He mixture in a dilution unit, enabling a base temperature of ~8 mK. Continuous circulation of the ³He/⁴He mixture for stable, ultra-low temperature operation. RF Lines Installed: 21x SMA lines (up to 18 GHz) with 60 dB attenuation. 7x K to 2.92 mm lines (up to 40 GHz). DC Lines: 48 phosphor bronze wires with EMI shielding and QFilters for DC measurements. 48 additional lines for scanners and positioners. 24 twisted-triple wires for LNA biasing (supports up to 8 LNAs). 3D Magnet Current Leads: Triple set: 120A / 60A / 60A (Copper/HTS leads). Optical Access: Vertical access via Spectrosil 2000 fused silica window. Horizontal access via fused silica window. Optical Fibers Included: 8x SMF28 (Single mode, FC/PC). 4x Thorlabs 630HP (Visible-range single mode). 4x Thorlabs S405-XP (405 nm single mode).

Instrument Manufacturer URL

Detailed Specifications

https://bluefors.com/products/dilution-refrigerator-measurement-systems/ld-dilution-refrigerator-measurement-system/