We offer improved vibration isolation for experiments that are particularly sensitive to low frequency vibrations (< 1 kHz).
- Basic vibration isolation frame
- Active vibration damping
- GHS isolation frame
- Pulse tube pause system.
We offer direct optical access to the sample space. The optical ports can be equipped with different window materials and are available in different sizes and configurations. With four 0.5″ optical ports, equipped with our standard fused silica windows, our DR systems still reach a base temperature of < 15 mK.
We offer magnetic shielding that can be fitted directly to the system (e.g. a magnetic shielding metal cylinder with one end closed inside the lower section of the vacuum can). For magnetic shielding we work together with Amuneal Manufacturing Corp.
Additional Radiation Shields
We offer the possibility for additional EM shielding around the sample space. These shields can be attached to the mixing chamber plate (LD and XLD) and the cold plate (XLD). Standard shields are made from gold-plated copper. Other materials and platings are available upon request.
Long-Life Cold Trap
We have developed a unique long-life cold trap that allows for continuous operation of the system for up to three years. The trap is integrated with the system and does not need any cryogenic liquids to operate (care-free).
4K Heater Kit
Fully automated fast warm-up option, which allows overnight warm-up for our standard LD systems.
LN2 Pre-cooling Loop
Engaging LN2 pre-cooling loop with an external source of liquid nitrogen allows to reduce the cool-down time by ~ 40% in case of a basic system.
We have developed a solution which enables running experiments at dilution refrigerator temperatures for a limited time with the pulse tube cryo-cooler switched off. Helium gas is condensed into a container installed at the 4K flange. Once the container has been filled with liquid helium, the pulse tube can be switched off and by pumping on the reservoir the 4K flange is cooled sufficiently for the dilution circuit to continue operating. Since this mode of operation involves both a mechanical cryo-cooler as well as cryogenic liquids we call it hybrid cooling. The battery performance is characterized by the hold time i.e. how long the dilution unit can be operated while the pulse tube is switched off. For an empty LD cryostat the hold time is approximately 3.5 hours. Due to the increased heat load at the 4K flange the hybrid system is not compatible with a superconducting magnet and any experimental wiring that would increase the heat load to the 4K flange will also decrease the hold time. In practical cases the hold time is between 2 to 3 hours.
Service Packages and Extended Warranty are available upon request